A photovoltaic air conditioning system and a control method, device and storage medium thereof

Abstract

The application discloses a kind of photovoltaic air conditioning system control method, device, photovoltaic air conditioning system and storage medium, the method includes: in the case where photovoltaic air conditioning system is powered off, control first switch is in open state, control second switch is in off state, and control third switch is in open state;In the case where photovoltaic air conditioning system is powered on and starts refrigeration mode, according to the current working mode of photovoltaic converter system and air conditioning system in host computer, the current heat dissipation mode of photovoltaic air conditioning system is determined;In the current heat dissipation mode of photovoltaic air conditioning system, the current parameter of photovoltaic air conditioning system is acquired;According to the current parameter of photovoltaic air conditioning system, the current heat dissipation mode of photovoltaic air conditioning system is controlled.The scheme, by setting host computer and slave machine, the temperature of host computer and photovoltaic mainboard of outdoor unit mainboard is controlled using different heat dissipation modes, facing small household or needing flexible cold arrangement is realized, and it is advantageous to energy saving.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of photovoltaic air conditioning systems, and particularly relates to a control method and device for a photovoltaic air conditioning system, the photovoltaic air conditioning system, and a storage medium, and more particularly to a temperature control method and device for a photovoltaic mainboard and an outdoor unit mainboard in a photovoltaic direct-current air conditioning system, the photovoltaic air conditioning system, and a storage medium. BACKGROUND

[0002] To achieve the goal of carbon peak and carbon neutrality, using clean energy to replace non-clean energy is the trend of the times. Among clean energy, the cost control and efficiency control of photovoltaic (i.e. photovoltaic power generation system) are constantly improving and progressing, the annual average of household photovoltaic (i.e. household photovoltaic) power is doubled, and the on-site consumption of photovoltaic power generation will be an increasingly important part, and photovoltaic air conditioning systems have emerged as the times require.

[0003] In related solutions, photovoltaic air conditioning systems are mainly used for commercial multi-split large-capacity units and light commercial multi-split large-capacity units. For small households or air conditioning use environments that need to arrange cooling capacity flexibly, photovoltaic air conditioning systems have no good implementation solutions, which limits the application range of photovoltaic air conditioning systems and is not conducive to the widespread use of clean energy, and of course, is not conducive to energy saving.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The present application aims to provide a control method and device for a photovoltaic air conditioning system, the photovoltaic air conditioning system, and a storage medium, to solve the problem that photovoltaic air conditioning systems have no good implementation solutions for small households or air conditioning use environments that need to arrange cooling capacity flexibly, which is not conducive to energy saving, and to achieve the effect of arranging master units and slave units, controlling the temperature of outdoor unit mainboards and photovoltaic mainboards of the master units by using different heat dissipation methods, and realizing the effect of facing small households or needing to arrange cooling capacity flexibly and being conducive to energy saving.

[0006] The application provides a control method of a photovoltaic air conditioning system, the photovoltaic air conditioning system comprising: a master and slaves, the master simultaneously having a photovoltaic inverter system and an air conditioning system, and all the slaves only having air conditioning systems; the photovoltaic inverter system having a photovoltaic mainboard and a photovoltaic mainboard radiator for dissipating heat of the photovoltaic mainboard, the photovoltaic mainboard radiator internally having a water cooling pipeline; the air conditioning system of the master having an indoor unit and an outdoor unit, and the air conditioning systems of all the slaves also having indoor units and outdoor units; the outdoor unit of the master having an outdoor unit mainboard and an outdoor unit mainboard radiator for dissipating heat of the outdoor unit mainboard of the master; the photovoltaic mainboard radiator and the outdoor unit mainboard radiator of the master are both arranged in an outdoor unit air duct cavity of the master, so that the photovoltaic mainboard radiator and / or the outdoor unit mainboard radiator of the master are air-cooled and dissipated by an outdoor unit fan of the master; a water storage box is arranged outside a casing of the outdoor unit of the master; a first passage, a second passage and a third passage are arranged outside the water storage box, the first passage is used for receiving condensed water generated by the outdoor unit of the master and inputting the condensed water into the inside of the water storage box, the second passage is used for conveying the condensed water collected in the inside of the water storage box to the water cooling pipeline in the inside of the photovoltaic mainboard radiator, so that the photovoltaic mainboard radiator is water-cooled and dissipated by the condensed water, and the third passage is used for receiving the condensed water after the condensed water is water-cooled and dissipated by the photovoltaic mainboard radiator, and the condensed water is discharged to the outside of a room after being combined with the excess condensed water stored in the inside of the water storage box; a first switch is arranged at the connection between the first passage and the water storage box, a second switch is arranged at the connection between the second passage and the water storage box, and a third switch is arranged at the connection between the third passage and the water storage box; the control device of the photovoltaic air conditioning system comprises: in the case that the photovoltaic air conditioning system is powered off, the first switch is controlled to be in an open state, the second switch is controlled to be in a closed state, and the third switch is controlled to be in an open state, so that the excess condensed water stored in the water storage box is discharged to the outside of the room; in the case that the photovoltaic air conditioning system is powered on and starts a refrigeration mode, a heat dissipation mode of the photovoltaic air conditioning system is determined according to a current working mode of the photovoltaic inverter system and the air conditioning system in the master, and the heat dissipation mode of the photovoltaic air conditioning system is recorded as a current heat dissipation mode of the photovoltaic air conditioning system; wherein the current working mode of the photovoltaic inverter system and the air conditioning system in the master comprises any one of the following modes: a pure photovoltaic mode in which the photovoltaic inverter system in the master is powered alone, a pure air conditioning mode in which the photovoltaic inverter system in the master is not powered and only mains power is supplied, and a photovoltaic hybrid operation mode in which the photovoltaic inverter system in the master and the mains power are jointly powered.The current heat dissipation mode of the photovoltaic air conditioning system includes at least one of the following: a first water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by condensate water, an air-cooling heat dissipation mode in which the photovoltaic main board radiator and / or the outdoor main board radiator of the outdoor unit of the main machine are air-cooled by the outdoor unit fan of the main machine, and a second water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by a water pump circulation system of the water storage box; the water pump circulation system of the water storage box is in communication with a water-cooling coil inside the photovoltaic main board radiator; in the current heat dissipation mode of the photovoltaic air conditioning system, current parameters of the photovoltaic air conditioning system are obtained; the current parameters of the photovoltaic air conditioning system include current environmental parameters of the photovoltaic air conditioning system and current operating parameters of the photovoltaic air conditioning system; and the current heat dissipation mode of the photovoltaic air conditioning system is controlled according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic main board and / or the outdoor main board of the outdoor unit of the main machine.

[0007] In some embodiments, the water storage box groove is arranged outside the casing of the outdoor unit of the main machine, and the water storage box is arranged in the water storage box groove; the water-cooling pipe inside the photovoltaic main board radiator is a coil; the coil has a condensate water inlet and a condensate water outlet; the condensate water inlet is in communication with the outlet of the second passage, and the condensate water outlet is in communication with the inlet of the third passage.

[0008] In some embodiments, according to the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine, the heat dissipation mode of the photovoltaic air conditioning system is determined as the current heat dissipation mode of the photovoltaic air conditioning system, including: if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure photovoltaic mode, the current heat dissipation mode of the photovoltaic air conditioning system is an air-cooling heat dissipation mode in which the photovoltaic main board radiator is air-cooled by the outdoor unit fan of the main machine; if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, the current heat dissipation mode of the photovoltaic air conditioning system is an air-cooling heat dissipation mode in which the outdoor main board radiator of the outdoor unit of the main machine is air-cooled by the outdoor unit fan of the main machine; and if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, the current heat dissipation mode of the photovoltaic air conditioning system is a first water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by condensate water, an air-cooling heat dissipation mode in which the photovoltaic main board radiator and the outdoor main board radiator of the outdoor unit of the main machine are air-cooled by the outdoor unit fan of the main machine, and a second water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by a water pump circulation system of the water storage box.

[0009] In some embodiments, according to the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to achieve temperature control of the photovoltaic main board and / or the outdoor unit main board of the main unit, including: in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main unit is the pure photovoltaic mode, determining that the current parameters of the photovoltaic air conditioning system are: the current temperature of the photovoltaic main board, the current outdoor environment temperature of the main unit; according to the current temperature of the photovoltaic main board and the current outdoor environment temperature of the main unit, determining the target rotating speed of the outdoor unit fan of the main unit according to a preset first formula, and controlling the outdoor unit fan of the main unit to operate at the target rotating speed of the outdoor unit fan of the main unit to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset first formula is:

[0010] R = R0 + K1 * (T s -T _out ) + K2 * (T s -T _out ) 2 ;

[0011] wherein R is the target rotating speed of the outdoor unit fan of the main unit, R0 is the rotating speed reference value of the outdoor unit fan of the main unit, K1 is a preset first control system, K2 is a preset second control coefficient, T s is the current temperature of the photovoltaic main board, and T _out is the current outdoor environment temperature of the main unit.

[0012] In some embodiments, the current heat dissipation mode of the photovoltaic air conditioning system is controlled according to the current parameters of the photovoltaic air conditioning system to achieve temperature control of the photovoltaic main board and / or the outdoor unit main board of the main machine, and further comprises: in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, determining that the current parameters of the photovoltaic air conditioning system are: the current temperature of the outdoor unit main board of the main machine, the current outdoor environment temperature of the main machine, the current running frequency of the compressor of the main machine, the current temperature of the photovoltaic main board, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines; determining the target rotating speed of the outdoor unit fan of the main machine according to the current temperature of the outdoor unit main board of the main machine, the current outdoor environment temperature of the main machine, and the current running frequency of the compressor of the main machine according to a preset second formula, and controlling the outdoor unit fan of the main machine to run at the target rotating speed of the outdoor unit fan of the main machine to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; controlling the opening and closing of the first switch, the second switch and the third switch, and controlling the opening degree of the second switch according to the current temperature of the photovoltaic main board, in combination with the current running frequency of the compressor of the main machine, the current temperature of the photovoltaic main board, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator, the current outdoor environment temperature of the main machine, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset second formula is:

[0013] R=R0+K3*T _out / T0+K4*(f _comp / f _max ) 2 ;

[0014] wherein R is the target rotating speed of the outdoor unit fan of the main machine, R0 is the rotating speed reference value of the outdoor unit fan of the main machine, K3 is a preset third control system, K4 is a preset fourth control coefficient, T0 is the current temperature of the outdoor unit main board of the main machine, T _out is the current outdoor environment temperature of the main machine, f _comp is the current running frequency of the compressor of the main machine, and f _max is the preset maximum running frequency of the compressor of the main machine.

[0015] In some embodiments, according to the current temperature of the photovoltaic main board, and in combination with the current operating frequency of the compressor of the host, the current temperature of the photovoltaic main board, the current outdoor ambient humidity of the host, the current temperature of the photovoltaic main board radiator, the current outdoor ambient temperature of the host, the current indoor ambient temperature of the host, and the current indoor ambient temperature of all slaves, the opening and closing of the first switch, the second switch and the third switch are controlled, and the opening degree of the second switch is controlled, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, including: if the current temperature of the photovoltaic main board is less than the first preset temperature of the photovoltaic main board, the first switch is controlled to be in an open state, the second switch is controlled to be in a closed state, and the third switch is controlled to be in an open state; if the current temperature of the photovoltaic main board is greater than or equal to the first preset temperature of the photovoltaic main board, the second switch is controlled to be in an open state, the target opening degree of the second switch is determined according to a preset third formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset third formula is:

[0016] K _valve =(a*f _comp / f _max ) 2 *RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T_ in1 +T _in2 +…+T _inn ) / n];

[0017] wherein K _valve is the target opening degree of the second switch, f _comp is the current operating frequency of the compressor of the host, f _max is the preset maximum operating frequency of the compressor of the host, RH is the current outdoor ambient humidity of the host, T _cond is the current temperature of the photovoltaic main board radiator, T1 is the first preset temperature of the photovoltaic main board, T _out is the current outdoor ambient temperature of the host, T_ in1 is the current indoor ambient temperature of the host, T _in2 is the current indoor ambient temperature of the first slave among all slaves, T _inn is the current indoor ambient temperature of the n-1th slave among all slaves, n is the total number of the host + all slaves, a is a preset first correction coefficient, b is a preset second correction coefficient, and c is a preset third correction coefficient.

[0018] In some embodiments, according to the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to achieve temperature control of the photovoltaic main board and / or the outdoor unit main board of the main machine, and further comprising: in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, determining that the current parameters of the photovoltaic air conditioning system are: the current temperature of the photovoltaic main board, the current outdoor environment temperature of the main machine, the current operating frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator, the current indoor environment temperature of the main machine, the current indoor environment temperature of all slave machines, and the photovoltaic power generation amount of the photovoltaic inverter system in the main machine; in the case that the photovoltaic power generation amount of the photovoltaic inverter system in the main machine is lower than a preset power threshold, according to the current temperature of the photovoltaic main board, the current outdoor environment temperature of the main machine, the current operating frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, determining the target rotating speed of the outdoor unit fan of the main machine according to a preset fourth formula, and controlling the outdoor unit fan of the main machine to operate at the target rotating speed of the outdoor unit fan of the main machine to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; and determining the target opening degree of the second switch according to a preset fifth formula, and controlling the opening degree of the second switch to be the target opening degree of the second switch to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; in the case that the photovoltaic power generation amount of the photovoltaic inverter system in the main machine is not lower than the preset power threshold, according to the current temperature of the photovoltaic main board, the current outdoor environment temperature of the main machine, the current operating frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, determining the target rotating speed of the outdoor unit fan of the main machine according to a preset sixth formula, and controlling the outdoor unit fan of the main machine to operate at the target rotating speed of the outdoor unit fan of the main machine to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; and determining the target opening degree of the second switch according to a preset seventh formula, and controlling the opening degree of the second switch to be the target opening degree of the second switch to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset fourth formula is:

[0019] R=(A-A _min ) / (A1-A _min )*R _min +K3*T _out / T0+K4*(f _comp / f _max ) 2 ;

[0020] The preset fifth formula is:

[0021] K _valve =(a*f _comp / f _max )2*RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T _in1 +T _in2 +…+T _inn ) / n];

[0022] The preset sixth formula is:

[0023] R=R0+K1*(T s -T _out )+K2*(T s -T _out ) 2 +K3*T _out / T0+K4*(f _comp / f _max ) 2 ;

[0024] The preset seventh formula is:

[0025] K _valve =(A–A1) / (A _max –A1)*K _max ;

[0026] Wherein, R is the target rotating speed of the outdoor fan of the host, R0 is the rotating speed reference value of the outdoor fan of the host, K1 is the preset first control system, K2 is the preset second control coefficient, K3 is the preset third control system, K4 is the preset fourth control coefficient, T s is the current temperature of the photovoltaic mainboard, T _out is the current outdoor environment temperature of the host, f _comp is the current operating frequency of the compressor of the host, f _max is the preset highest operating frequency of the compressor of the host, RH is the current outdoor environment humidity of the host, T _cond is the current temperature of the photovoltaic mainboard radiator, T1 is the first preset temperature of the photovoltaic mainboard, T in1 is the current indoor environment temperature of the host, T _in2 is the current indoor environment temperature of the first slave among all the slaves, and T _innis the current indoor environment temperature of the n-1th slave among all the slaves, n is the total number of the master and all the slaves, a is a preset first correction coefficient, b is a preset second correction coefficient, c is a preset third correction coefficient, K _valve is a target opening degree of the second switch, A is a photovoltaic power generation amount of a photovoltaic inverter system in the master, A _min is a minimum value of the photovoltaic power generation amount of the photovoltaic inverter system in the master, A _max is a maximum value of the photovoltaic power generation amount of the photovoltaic inverter system in the master; A1 is a preset power threshold value; R _min is a minimum value of a rotating speed of an outdoor unit fan of the master, K _max is a maximum opening degree of the second switch.

[0027] According to the method, the application also provides a control device of a photovoltaic air conditioning system. The photovoltaic air conditioning system comprises a master and slaves. The master has a photovoltaic inverter system and an air conditioning system. The slaves only have air conditioning systems. The photovoltaic inverter system has a photovoltaic mainboard and a photovoltaic mainboard radiator for dissipating heat of the photovoltaic mainboard. The photovoltaic mainboard radiator has a water cooling pipeline inside. The air conditioning system of the master has an indoor unit and an outdoor unit. The air conditioning systems of the slaves also have indoor units and outdoor units. The outdoor unit of the master has an outdoor mainboard and an outdoor mainboard radiator for dissipating heat of the outdoor mainboard. The photovoltaic mainboard radiator and the outdoor mainboard radiator of the master are arranged in an outdoor air duct cavity of the master, so that the photovoltaic mainboard radiator and / or the outdoor mainboard radiator of the master are air-cooled by an outdoor fan of the master. A water storage box is arranged outside a casing of the outdoor unit of the master. A first passage, a second passage and a third passage are arranged outside the water storage box. The first passage is used for receiving condensed water generated by the outdoor unit of the master and inputting the condensed water into the water storage box. The second passage is used for conveying the condensed water collected in the water storage box to the water cooling pipeline inside the photovoltaic mainboard radiator, so that the photovoltaic mainboard radiator is water-cooled by the condensed water. The third passage is used for receiving the condensed water after the condensed water is water-cooled by the photovoltaic mainboard radiator, and the condensed water is discharged outside after being combined with excess condensed water stored in the water storage box. A first switch is arranged at a connection between the first passage and the water storage box. A second switch is arranged at a connection between the second passage and the water storage box. A third switch is arranged at a connection between the third passage and the water storage box. The control device of the photovoltaic air conditioning system comprises a control unit. The control unit is configured to control the first switch to be in an open state, control the second switch to be in a closed state, and control the third switch to be in an open state, so that excess condensed water stored in the water storage box is discharged outside when the photovoltaic air conditioning system is powered off. The control unit is also configured to determine a heat dissipation mode of the photovoltaic air conditioning system according to a current working mode of the photovoltaic inverter system and the air conditioning system in the master, and the heat dissipation mode is recorded as a current heat dissipation mode of the photovoltaic air conditioning system. The current working mode of the photovoltaic inverter system and the air conditioning system in the master comprises any one of the following modes: a pure photovoltaic mode in which the photovoltaic inverter system in the master supplies power alone, a pure air conditioning mode in which the photovoltaic inverter system in the master does not supply power and only mains supplies power, and a photovoltaic hybrid operation mode in which the photovoltaic inverter system in the master and the mains supply power together.The current heat dissipation mode of the photovoltaic air conditioning system includes at least one of the following: a first water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by condensate water, an air-cooling heat dissipation mode in which the photovoltaic main board radiator and / or the outdoor main board radiator of the outdoor unit of the main machine are air-cooled by the outdoor unit fan of the main machine, and a second water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by a water pump circulation system of the water storage box; the water pump circulation system of the water storage box is in communication with a water-cooling coil inside the photovoltaic main board radiator; a obtaining unit is configured to obtain current parameters of the photovoltaic air conditioning system in the current heat dissipation mode of the photovoltaic air conditioning system; the current parameters of the photovoltaic air conditioning system include current environmental parameters of the photovoltaic air conditioning system and current operating parameters of the photovoltaic air conditioning system; and the control unit is further configured to control the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, so as to achieve temperature control of the photovoltaic main board and / or the outdoor main board of the outdoor unit of the main machine.

[0028] In some embodiments, the water storage box slot is arranged outside the casing of the outdoor unit of the main machine, and the water storage box is arranged in the water storage box slot; the water-cooling pipe inside the photovoltaic main board radiator is a coil; the coil has a condensate water inlet and a condensate water outlet; the condensate water inlet is in communication with the outlet of the second passage, and the condensate water outlet is in communication with the inlet of the third passage.

[0029] In some embodiments, the control unit determines the heat dissipation mode of the photovoltaic air conditioning system according to the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine, and the heat dissipation mode is referred to as the current heat dissipation mode of the photovoltaic air conditioning system; if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure photovoltaic mode, the current heat dissipation mode of the photovoltaic air conditioning system is the air-cooling heat dissipation mode in which the photovoltaic main board radiator is air-cooled by the outdoor unit fan of the main machine; if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, the current heat dissipation mode of the photovoltaic air conditioning system is the air-cooling heat dissipation mode in which the outdoor main board radiator of the outdoor unit of the main machine is air-cooled by the outdoor unit fan of the main machine; and if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, the current heat dissipation mode of the photovoltaic air conditioning system is the first water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by condensate water, the air-cooling heat dissipation mode in which the photovoltaic main board radiator and the outdoor main board radiator of the outdoor unit of the main machine are air-cooled by the outdoor unit fan of the main machine, and the second water-cooling heat dissipation mode in which the photovoltaic main board radiator is water-cooled by the water pump circulation system of the water storage box.

[0030] In some embodiments, the control unit controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system to achieve temperature control of the photovoltaic main board and / or the outdoor unit main board of the main machine, including: in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure photovoltaic mode, determining that the current parameters of the photovoltaic air conditioning system are: the current temperature of the photovoltaic main board, the current outdoor environment temperature of the main machine; according to the current temperature of the photovoltaic main board and the current outdoor environment temperature of the main machine, determining the target rotating speed of the outdoor unit fan of the main machine according to a preset first formula, and controlling the outdoor unit fan of the main machine to run at the target rotating speed of the outdoor unit fan of the main machine to achieve control of the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset first formula is:

[0031] R = R0 + K1 * (T s -T _out ) + K2 * (T s -T _out ) 2 ;

[0032] wherein R is the target rotating speed of the outdoor unit fan of the main machine, R0 is the rotating speed reference value of the outdoor unit fan of the main machine, K1 is a preset first control system, K2 is a preset second control coefficient, T s is the current temperature of the photovoltaic main board, and T _out is the current outdoor environment temperature of the main machine.

[0033] In some embodiments, the control unit controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system to achieve temperature control of the photovoltaic main board and / or the outdoor main board of the main unit, and further comprises: in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main unit is the pure air conditioning mode, determining the current parameters of the photovoltaic air conditioning system as: the current temperature of the outdoor main board of the main unit, the current outdoor environment temperature of the main unit, the current running frequency of the compressor of the main unit, the current temperature of the photovoltaic main board, the current outdoor environment humidity of the main unit, the current temperature of the photovoltaic main board radiator, the current indoor environment temperature of the main unit, and the current indoor environment temperature of all slave units; determining the target rotating speed of the outdoor fan of the main unit according to the current temperature of the outdoor main board of the main unit, the current outdoor environment temperature of the main unit, and the current running frequency of the compressor of the main unit according to a preset second formula, and controlling the outdoor fan of the main unit to run at the target rotating speed of the outdoor fan of the main unit to control the current heat dissipation mode of the photovoltaic air conditioning system; controlling the opening and closing of the first switch, the second switch and the third switch, and controlling the opening degree of the second switch according to the current temperature of the photovoltaic main board, in combination with the current running frequency of the compressor of the main unit, the current temperature of the photovoltaic main board, the current outdoor environment humidity of the main unit, the current temperature of the photovoltaic main board radiator, the current outdoor environment temperature of the main unit, the current indoor environment temperature of the main unit, and the current indoor environment temperature of all slave units, to control the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset second formula is:

[0034] R = R0 + K3 * T _out / T0 + K4 * (f _comp / f _max ) 2 ;

[0035] wherein R is the target rotating speed of the outdoor fan of the main unit, R0 is the rotating speed reference value of the outdoor fan of the main unit, K3 is a preset third control system, K4 is a preset fourth control coefficient, T0 is the current temperature of the outdoor main board of the main unit, T _out is the current outdoor environment temperature of the main unit, f _comp is the current running frequency of the compressor of the main unit, and f _max is the preset maximum running frequency of the compressor of the main unit.

[0036] In some embodiments, the control unit controls the opening and closing of the first switch, the second switch and the third switch, and controls the opening degree of the second switch, according to the current temperature of the photovoltaic main board, in combination with the current operating frequency of the compressor of the main machine, the current temperature of the photovoltaic main board, the current outdoor ambient humidity of the main machine, the current temperature of the photovoltaic main board radiator, the current outdoor ambient temperature of the main machine, the current indoor ambient temperature of the main machine, and the current indoor ambient temperature of all slave machines, to control the current heat dissipation mode of the photovoltaic air conditioning system, including: if the current temperature of the photovoltaic main board is less than the first preset temperature of the photovoltaic main board, controlling the first switch to be in an open state, controlling the second switch to be in a closed state, and controlling the third switch to be in an open state; if the current temperature of the photovoltaic main board is greater than or equal to the first preset temperature of the photovoltaic main board, controlling the second switch to be in an open state, determining the target opening degree of the second switch according to a preset third formula, and controlling the opening degree of the second switch to be the target opening degree of the second switch, to control the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset third formula is:

[0037] K _valve =(a*f _comp / f _max ) 2 *RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T_ in1 +T _in2 +…+T _inn ) / n];

[0038] wherein K _valve is the target opening degree of the second switch, f _comp is the current operating frequency of the compressor of the main machine, f _max is the preset maximum operating frequency of the compressor of the main machine, RH is the current outdoor ambient humidity of the main machine, T _cond is the current temperature of the photovoltaic main board radiator, T1 is the first preset temperature of the photovoltaic main board, T _out is the current outdoor ambient temperature of the main machine, T in1 is the current indoor ambient temperature of the main machine, T _in2 is the current indoor ambient temperature of the first slave machine among all slave machines, T _inn is the current indoor ambient temperature of the n-1th slave machine among all slave machines, n is the total number of the main machine + all slave machines, a is a preset first correction coefficient, b is a preset second correction coefficient, and c is a preset third correction coefficient.

[0039] In some embodiments, the control unit controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system to achieve temperature control of the photovoltaic mainboard and / or the outdoor unit mainboard of the main machine, and further comprises: in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, determining that the current parameters of the photovoltaic air conditioning system are: the current temperature of the photovoltaic mainboard, the current outdoor environment temperature of the main machine, the current operating frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic mainboard radiator, the current indoor environment temperature of the main machine, the current indoor environment temperature of all slave machines, and the photovoltaic power generation amount of the photovoltaic inverter system in the main machine; in the case that the photovoltaic power generation amount of the photovoltaic inverter system in the main machine is lower than a preset power threshold, determining the target rotating speed of the outdoor unit fan of the main machine according to the current temperature of the photovoltaic mainboard, the current outdoor environment temperature of the main machine, the current operating frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic mainboard radiator, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, according to a preset fourth formula, and controlling the outdoor unit fan of the main machine to operate at the target rotating speed of the outdoor unit fan of the main machine to control the current heat dissipation mode of the photovoltaic air conditioning system; and determining the target opening degree of the second switch according to a preset fifth formula, and controlling the opening degree of the second switch to be the target opening degree of the second switch to control the current heat dissipation mode of the photovoltaic air conditioning system; in the case that the photovoltaic power generation amount of the photovoltaic inverter system in the main machine is not lower than the preset power threshold, determining the target rotating speed of the outdoor unit fan of the main machine according to the current temperature of the photovoltaic mainboard, the current outdoor environment temperature of the main machine, the current operating frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic mainboard radiator, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, according to a preset sixth formula, and controlling the outdoor unit fan of the main machine to operate at the target rotating speed of the outdoor unit fan of the main machine to control the current heat dissipation mode of the photovoltaic air conditioning system; and determining the target opening degree of the second switch according to a preset seventh formula, and controlling the opening degree of the second switch to be the target opening degree of the second switch to control the current heat dissipation mode of the photovoltaic air conditioning system; wherein the preset fourth formula is:

[0040] R=(A-A _min ) / (A1-A _min )*R _min +K3*T _out / T0+K4*(f _comp / f _max ) 2 ;

[0041] The preset fifth formula is:

[0042] K _valve =(a*f _comp / f _max )2*RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T _in1 +T _in2 +…+T _inn ) / n];

[0043] The preset sixth formula is:

[0044] R=R0+K1*(T s -T _out )+K2*(T s -T _out ) 2 +K3*T _out / T0+K4*(f _comp / f _max ) 2 ;

[0045] The preset seventh formula is:

[0046] K _valve =(A–A1) / (A _max –A1)*K _max ;

[0047] Wherein, R is the target rotating speed of the outdoor fan of the host, R0 is the rotating speed reference value of the outdoor fan of the host, K1 is the preset first control system, K2 is the preset second control coefficient, K3 is the preset third control system, K4 is the preset fourth control coefficient, T s is the current temperature of the photovoltaic mainboard, T _out is the current outdoor environment temperature of the host, f _comp is the current operating frequency of the compressor of the host, f _max is the preset highest operating frequency of the compressor of the host, RH is the current outdoor environment humidity of the host, T _cond is the current temperature of the photovoltaic mainboard radiator, T1 is the first preset temperature of the photovoltaic mainboard, T in1 is the current indoor environment temperature of the host, T _in2 is the current indoor environment temperature of the first slave among all the slaves, and T _innis the current indoor environment temperature of the n-1th slave among all the slaves, n is the total number of the master and all the slaves, a is a preset first correction coefficient, b is a preset second correction coefficient, c is a preset third correction coefficient, K _valve is the target opening degree of the second switch, A is the photovoltaic power generation amount of the photovoltaic inverter system in the master, A _min is the minimum value of the photovoltaic power generation amount of the photovoltaic inverter system in the master, A _max is the maximum value of the photovoltaic power generation amount of the photovoltaic inverter system in the master; A1 is a preset power threshold value; R _min is the minimum value of the rotating speed of the outdoor fan of the master, K _max is the maximum opening degree of the second switch.

[0048] In order to match the above device, the present application further provides a photovoltaic air conditioning system, comprising the above-mentioned control device of the photovoltaic air conditioning system.

[0049] In order to match the above method, the present application further provides a storage medium, which comprises a stored program, wherein when the program is running, the device where the storage medium is located executes the above-mentioned control method of the photovoltaic air conditioning system.

[0050] Thus, the scheme of the present application, by setting master and slave for photovoltaic air conditioning system, the master has photovoltaic inverter system and air conditioning system, the slave has only air conditioning system, the master's air conditioning system includes indoor unit and outdoor unit, the slave's air conditioning system also includes indoor unit and outdoor unit, the master is responsible for processing input power and supplying power according to the required load of each slave to drive the air conditioning system of the slave to operate, and the master controls the operation of the slave; the outdoor unit of the master side has a water storage box, a first switch is arranged on the condensate water inlet passage of the water storage box, a second switch is arranged on the passage of the condensate water into the radiator and the second switch is a two-way valve with adjustable opening degree, and a third switch is arranged on the condensate water outlet passage of the water storage box; the working mode of the photovoltaic air conditioning system includes pure photovoltaic mode, pure air conditioning mode and pure air conditioning mode, the opening and closing states of the first switch, the second switch and the third switch are controlled to prevent the condensate water from entering the indoor in the case of turning off the photovoltaic air conditioning system, and at least one of the speed of the outdoor fan in the air cooling heat dissipation mode and the opening degree of the second switch in the water cooling heat dissipation mode is controlled according to at least one of the temperature of the photovoltaic mainboard, the outdoor environment temperature, the outdoor fan speed, the compressor operating frequency, the current indoor environment temperature of the master and slave, the outdoor air humidity, the number of the master and slave and the photovoltaic power generation capacity in different working modes after the photovoltaic air conditioning system is turned on, so that the temperature of the outdoor unit mainboard and the photovoltaic mainboard of the master is controlled by using different heat dissipation modes in different working modes of the master and the slave, thereby, by setting the master and the slave, the temperature of the outdoor unit mainboard and the photovoltaic mainboard of the master is controlled by using different heat dissipation modes, and the small household or the need for flexible cold arrangement is realized, and energy saving is facilitated.

[0051] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application.

[0052] The technical scheme of the present application will be further described in detail below with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 Flowchart of an embodiment of the control device of the photovoltaic air conditioning system of the present application;

[0054] Figure 2 Flowchart of an embodiment of the air cooling heat dissipation mode for air cooling heat dissipation of the photovoltaic mainboard radiator 3 in the pure photovoltaic mode in the method of the present application;

[0055] Figure 3 Flowchart of an embodiment of the air cooling heat dissipation mode for air cooling heat dissipation of the photovoltaic mainboard radiator 3 and the outdoor unit mainboard of the master in the pure air conditioning mode in the method of the present application;

[0056] Figure 4A flow chart of an embodiment of the first water cooling heat dissipation mode for water cooling heat dissipation of the photovoltaic main board radiator 3 by using condensed water in the photovoltaic hybrid operation mode in the method of the present application, the air cooling heat dissipation mode for air cooling heat dissipation of the photovoltaic main board radiator 3 and the main machine main board radiator of the main machine by using the main machine external machine fan, and the second water cooling heat dissipation mode for water cooling heat dissipation of the photovoltaic main board radiator 3 by using a preset water pump circulation system of the water storage box;

[0057] Figure 5 A structure diagram of an embodiment of the control device of the photovoltaic air conditioning system of the present application;

[0058] Figure 6 A structure diagram of an embodiment of the main machine in the photovoltaic air conditioning system;

[0059] Figure 7 A structure diagram of an embodiment of the extension machine in the photovoltaic air conditioning system;

[0060] Figure 8 A structure diagram of an embodiment of the communication network of the photovoltaic air conditioning system;

[0061] Figure 9 A structure diagram of an embodiment of the photovoltaic air conditioning external machine in the photovoltaic air conditioning system;

[0062] Figure 10 A structure diagram of an embodiment of the water storage box in the photovoltaic air conditioning system;

[0063] Figure 11 A structure diagram of an embodiment of the photovoltaic main board radiator in the photovoltaic air conditioning system, wherein (a) is a structure diagram of a first view of the photovoltaic main board radiator, (b) is a structure diagram of a second view of the photovoltaic main board radiator, and (c) is a structure diagram of a third view of the photovoltaic main board radiator.

[0064] In combination with the drawings, the following are the reference signs in the embodiments of the present application:

[0065] 11 - condensed water inlet; 12 - condensed water outlet; 2 - water storage box tank; 3 - photovoltaic main board radiator; 4 - photovoltaic main board; 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0067] In view of the above, there is no good implementation scheme for photovoltaic air conditioning systems in small-sized housing or air conditioning environments that require flexible cold arrangement. If the implementation scheme of photovoltaic air conditioning systems of commercial air conditioners or light commercial air conditioners is directly used for household air conditioners, there will be many problems. For example: first, capacity mismatch: photovoltaic commercial air conditioners are usually designed for commercial buildings or large office spaces and have large refrigeration / heating capacity to meet the space requirements. Household photovoltaic air conditioners have smaller capacity and are suitable for individual families or small residential buildings. Therefore, applying the commercial air conditioner scheme to household photovoltaic air conditioners may result in overdesign or poor efficiency. Second, function and control complexity: photovoltaic commercial air conditioners usually have more functions and flexible control options to meet the needs of commercial buildings, such as multi-zone temperature control, timed start-stop, remote monitoring, etc. Household photovoltaic air conditioners have relatively simplified functions and controls, and focus more on basic comfort and energy efficiency. Applying the commercial air conditioner scheme to household photovoltaic air conditioners may result in redundant functions or complex operation interfaces, which do not meet the actual needs of household users. Third, cost and economy: photovoltaic commercial air conditioners usually have higher costs, including the price of the equipment itself and installation, maintenance, etc. Household photovoltaic air conditioners focus more on economy and cost-effectiveness to meet the budget constraints of individual families. Therefore, applying the commercial air conditioner scheme to household photovoltaic air conditioners may increase unnecessary costs and investment.

[0068] According to an embodiment of the present application, a control method of a photovoltaic air conditioning system is provided, such as Figure 1Flowchart of an embodiment of the method of the application. The photovoltaic air conditioning system includes a master and slaves, the master has both a photovoltaic inverter system and an air conditioning system, and all the slaves have only air conditioning systems. The photovoltaic inverter system has a photovoltaic mainboard 4 and a photovoltaic mainboard radiator 3 for dissipating heat from the photovoltaic mainboard 4, and the photovoltaic mainboard radiator 3 has a water cooling pipe inside. The air conditioning system of the master has an indoor unit and an outdoor unit, and the air conditioning systems of all the slaves also have indoor units and outdoor units. The outdoor unit of the master has an outdoor unit mainboard and an outdoor unit mainboard radiator for dissipating heat from the outdoor unit mainboard of the master. The photovoltaic mainboard radiator 3 and the outdoor unit mainboard radiator of the master are both arranged in the outdoor unit air duct cavity of the master, so that the photovoltaic mainboard radiator 3 and / or the outdoor unit mainboard radiator of the master are cooled by the outdoor unit fan of the master. Outside the casing of the outdoor unit of the master, a water storage box groove 2 is arranged, and a water storage box is arranged in the water storage box groove 2. A first passage, a second passage and a third passage are arranged outside the water storage box, the first passage is used to receive condensed water generated by the outdoor unit of the master and input into the inside of the water storage box, the second passage is used to transport the condensed water collected in the inside of the water storage box to the water cooling pipe inside the photovoltaic mainboard radiator 3 so that the photovoltaic mainboard radiator 3 is water-cooled by the condensed water, and the third passage is used to receive the condensed water after the photovoltaic mainboard radiator 3 is water-cooled by the condensed water and discharge the condensed water combined with the excess condensed water stored in the inside of the water storage box outside. A first switch is arranged at the connection between the first passage and the water storage box, a second switch is arranged at the connection between the second passage and the water storage box, and a third switch is arranged at the connection between the third passage and the water storage box. Specifically, Figure 6 Constituent diagram of an embodiment of the master of the photovoltaic air conditioning system. As shown in the figure, Figure 6 The master includes an inverter control system and an air conditioning system. The inverter control system includes a control module, a grid-connected module and a heat dissipation module. The air conditioning system includes an outdoor unit and an indoor unit. The outdoor unit includes an outdoor unit controller, a compressor, an outdoor fan, an outdoor heat exchanger and a connection assembly, and the outdoor unit controller, the compressor, the outdoor fan and the outdoor heat exchanger are connected through the connection assembly. The indoor unit includes an indoor unit controller, an indoor fan, an indoor heat exchanger and a connection assembly, and the indoor unit controller, the indoor fan and the indoor heat exchanger are connected through the connection assembly. Figure 7 Constituent diagram of an embodiment of the slave of the photovoltaic air conditioning system. As shown in the figure, Figure 7As shown, the branch machine includes an air conditioning system, which includes an outdoor unit (i.e., an outdoor machine) and an indoor unit (i.e., an indoor machine). The outdoor unit includes an outdoor unit controller, a compressor, an outdoor fan, an outdoor heat exchanger, and a connecting assembly, and the outdoor unit controller, the compressor, the outdoor fan, and the outdoor heat exchanger are connected through the connecting assembly. The indoor unit includes an indoor unit controller, an indoor fan, an indoor heat exchanger, and a connecting assembly, and the indoor unit controller, the indoor fan, and the indoor heat exchanger are connected through the connecting assembly. Figure 8 As shown, the host machine includes a host machine variable flow control system, which can send a control action signal to a host machine outdoor unit controller. The host machine outdoor unit controller can send a control action signal to a host machine indoor unit controller. The host machine indoor unit controller can receive a user demand signal and feedback the user demand signal to the host machine variable flow control system through the host machine outdoor unit controller. The host machine outdoor unit controller can also send a control action signal to a branch machine outdoor unit controller. The branch machine outdoor unit controller can send a control action signal to a branch machine indoor unit controller. The branch machine indoor unit controller can receive a user demand signal and feedback the user demand signal to the host machine variable flow control system through the branch machine outdoor unit controller and the host machine outdoor unit controller. Figure 8

[0069] In the scheme of the present application, the host machine is responsible for processing the input power supply and supplying power according to the required load of each branch machine to drive the air conditioning system of the branch machine to operate. The host machine distributes the required direct current power of each branch machine, and the host machine can be provided with a rectification system, which can convert alternating current from the power grid into direct current to supply the host machine itself and other branch machines when the photovoltaic direct current power supply is insufficient. The host machine can also be provided with an energy storage battery, which can store excess photovoltaic power when the load of the photovoltaic direct drive air conditioning system is less than the photovoltaic power generation. The host machine can also be provided with an inverter system, which can convert photovoltaic power into alternating current to feed back to the power grid when the battery is fully charged and the photovoltaic direct drive air conditioning system has no load. In the scheme of the present application, the characteristics of photovoltaic energy are ingeniously utilized to improve the practicality and comfort of the photovoltaic air conditioning system.

[0070] Figure 9 As shown, the photovoltaic air conditioning outdoor machine has a photovoltaic main board 4, a photovoltaic main board heat sink 3, and a water storage box groove 2. The photovoltaic main board heat sink 3 is arranged below the photovoltaic main board 4, and the water storage box groove 2 is arranged on the side wall of the machine shell of the photovoltaic air conditioning outdoor machine. Figure 9 Figure 9 ​​The shown photovoltaic air conditioner outdoor unit is based on the related scheme of household air conditioner, and a photovoltaic control mainboard module (such as photovoltaic mainboard 4) is added. The radiator of the photovoltaic control mainboard module (i.e. photovoltaic mainboard radiator 3) is placed below the photovoltaic mainboard 4. The photovoltaic mainboard radiator 3 uses a tooth-shaped heat dissipation form. A disc-shaped copper pipe is embedded in the photovoltaic mainboard radiator 3. A radiator temperature sensing bag is also added in the photovoltaic mainboard radiator 3, and the radiator temperature sensing bag is connected to the photovoltaic mainboard 4. Figure 9 In the shown example, the placement mode of the photovoltaic mainboard 4 and the photovoltaic mainboard radiator can realize air cooling heat dissipation, and the water storage box can realize water cooling heat dissipation mode. In the refrigeration mode, the condensed water generated during the operation of the indoor unit of the master and slave units is collected into the condensed water storage box (such as the water storage box installed in the water storage box groove 2). A condenser drainage branch is arranged before the condensed water enters the water storage box to normally discharge the excess condensed water. Figure 10 The structure diagram of an embodiment of the water storage box in the photovoltaic air conditioner system is shown as Figure 10 As shown, the body of the water storage box has three passages, such as a first passage, a second passage, and a third passage. The first passage is arranged at the upper part of the body of the water storage box, the second passage is arranged at the bottom of the body of the water storage box, and the third passage is arranged at the side of the body of the water storage box. The first passage is used to receive indoor condensed water and enter the inside of the body of the water storage box. The second passage is used to output the condensed water accumulated in the inside of the body of the water storage box to the radiator (such as the photovoltaic mainboard radiator 3). The third passage has two branches. The first branch is used to receive the condensed water flowing back from the radiator (such as the photovoltaic mainboard radiator 3) and flow into the second branch. The second branch is used to discharge the condensed water flowing into the first branch. The second branch is also used to discharge the excess condensed water in the inside of the body of the water storage box to the outside when the condensed water in the inside of the body of the water storage box is too much. A control switch is arranged on each passage. For example, a first switch S1 is arranged at the connection between the first passage and the body of the water storage box. A second switch S2 is arranged at the connection between the second passage and the body of the water storage box. A third switch S3 is arranged at the connection between the third passage and the body of the water storage box. Each control switch is equipped with an independent stepping motor. The second switch S2 added in the passage (i.e. the second passage) of the water storage box into the radiator (such as the photovoltaic mainboard radiator 3) can be a two-way valve with variable opening degree. The copper pipe after entering the two-way valve during the process of outputting the condensed water accumulated in the inside of the body of the water storage box to the radiator (such as the photovoltaic mainboard radiator 3) is transported into the embedded copper pipe in the photovoltaic mainboard radiator 3, and the condensed waste water is discharged by flowing into the drainage branch pipe (such as the second branch of the third passage). The photovoltaic mainboard radiator 3 and the outdoor unit mainboard radiator are arranged in the outdoor unit air duct cavity. The photovoltaic mainboard radiator 3 can use water cooling heat exchange in addition to air cooling heat exchange by negative pressure generated by the rotation of the axial flow fan blade. Since the power of the outdoor unit mainboard is small, it does not need to be equipped with a water cooling heat dissipation module, and the fan negative pressure system heat exchange can meet the heat dissipation requirements. Figure 10In the shown example, the water cooling mode can be controlled by the two-way valve and the motor.

[0071] In some embodiments, the water cooling pipe inside the photovoltaic main board radiator 3 is a coil pipe. The coil pipe has a condensate water inlet 11 and a condensate water outlet 12. The condensate water inlet 11 is connected to the outlet of the second passage, and the condensate water outlet 12 is connected to the inlet of the third passage.

[0072] Figure 11 The structure diagram of an embodiment of the photovoltaic main board radiator in the photovoltaic air conditioning system, wherein (a) is the structure diagram of the first view of the photovoltaic main board radiator, (b) is the structure diagram of the second view of the photovoltaic main board radiator, and (c) is the structure diagram of the third view of the photovoltaic main board radiator. As shown in the figure, Figure 11 As shown, the water cooling pipe inside the photovoltaic main board radiator 3 is a coil pipe, and the coil pipe has a condensate water inlet 11 and a condensate water outlet 12, which can realize the wind cooling and water cooling collaborative operation, such as the pure photovoltaic mode, the pure air conditioning mode, and the photovoltaic hybrid operation mode.

[0073] Considering that, on the basis of the master-slave machine, since the power consumption of the photovoltaic main board is large, the heat dissipation problem of the photovoltaic main board is a difficulty, therefore, the scheme of the present application proposes a temperature control device of the photovoltaic main board radiator and the outdoor unit main board radiator of the photovoltaic air conditioning system in different air conditioning operation modes, which realizes the collaborative operation of the master and the slave machine when the slave machine exists, and increases the reliability of the photovoltaic air conditioner.

[0074] As shown in the figure, Figure 1 The control method of the photovoltaic air conditioning system includes steps S110 to S140.

[0075] At step S110, in the case that the photovoltaic air conditioning system is powered off, the first switch is controlled to be in an open state, the second switch is controlled to be in a closed state, and the third switch is controlled to be in an open state, so that the excess condensate water stored in the water storage box is discharged outdoors.

[0076] At step S120, in the case that the photovoltaic air conditioning system is started and the refrigeration mode is started, according to the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine, the heat dissipation mode of the photovoltaic air conditioning system is determined, which is recorded as the current heat dissipation mode of the photovoltaic air conditioning system. The current working mode of the photovoltaic inverter system and the air conditioning system in the main machine includes any one of the following modes: a pure photovoltaic mode in which the photovoltaic inverter system in the main machine supplies power alone, a pure air conditioning mode in which the photovoltaic inverter system in the main machine does not supply power and only the power supply supplies power, and a photovoltaic hybrid operation mode in which the photovoltaic inverter system in the main machine and the power supply supply power together. The current heat dissipation mode of the photovoltaic air conditioning system includes at least one of the following: a first water cooling heat dissipation mode in which the photovoltaic main board radiator 3 is water cooled by condensate water, an air cooling heat dissipation mode in which the photovoltaic main board radiator 3 and / or the outdoor main board radiator of the main machine are air cooled by the outdoor fan of the main machine, and a second water cooling heat dissipation mode in which the photovoltaic main board radiator 3 is water cooled by a water pump circulation system of the water storage box. The water pump circulation system of the water storage box is in communication with the water cooling coil inside the photovoltaic main board radiator 3.

[0077] In some embodiments, in the case that the photovoltaic air conditioning system is started and the refrigeration mode is started at step S120, according to the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine, the heat dissipation mode of the photovoltaic air conditioning system is determined, which is recorded as the current heat dissipation mode of the photovoltaic air conditioning system. The current heat dissipation mode of the photovoltaic air conditioning system includes any one of the following heat dissipation mode determination cases:

[0078] The first heat dissipation mode determination case: if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure photovoltaic mode, the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode in which the photovoltaic main board radiator 3 is air cooled by the outdoor fan of the main machine.

[0079] The second heat dissipation mode determination case: if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode in which the outdoor main board radiator of the main machine is air cooled by the outdoor fan of the main machine.

[0080] The third heat dissipation mode determination case: if the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, the current heat dissipation mode of the photovoltaic air conditioning system is at least one of the following: the first water cooling heat dissipation mode in which the photovoltaic main board radiator 3 is water cooled by condensate water, the air cooling heat dissipation mode in which the photovoltaic main board radiator 3 and the outdoor main board radiator of the main machine are air cooled by the outdoor fan of the main machine, and the second water cooling heat dissipation mode in which the photovoltaic main board radiator 3 is water cooled by the water pump circulation system of the water storage box.

[0081] Specifically, in the scheme of the present application, since the photovoltaic main board 4 may have a case of excessive module temperature under high temperature, only the refrigeration mode is discussed below. In the refrigeration mode, the temperature control device of the photovoltaic main board radiator and the outdoor unit main board radiator of the photovoltaic air conditioning system under different air conditioning operation modes, comprising:

[0082] Step 1, in the case of closing the photovoltaic air conditioning system, the first switch S1 and the third switch S3 in the water storage box are in the open state, and the second switch S2 is in the long closed state, so that the excess condensate water stored in the indoor unit pipeline can be normally discharged, preventing the condensate water from flowing into the indoor unit. After the photovoltaic air conditioning system is turned on, step 2 is performed.

[0083] Step 2, in the case of starting the refrigeration of the photovoltaic air conditioning system, the logic control is performed according to the following three modes: the first mode in step 21, that is, the control logic in the pure photovoltaic mode, the second mode in step 22, that is, the control logic in the pure air conditioning mode, and the third mode in step 23, that is, the control logic in the air conditioning photovoltaic hybrid operation mode.

[0084] In the scheme of the present application, the photovoltaic direct-drive air conditioning system has the difference between the host and the slave, the host has the photovoltaic inverter system and the air conditioning system, and the slave only has the air conditioning system. The air conditioning system of the host includes an indoor unit and an outdoor unit, and the air conditioning system of the slave also includes an indoor unit and an outdoor unit. The host controls the operation of the slave, and is the operation, processing and control center of the whole photovoltaic direct-drive air conditioning system, and has all the functions of the slave. The slave collects the environmental information of its indoor unit and outdoor unit, and feeds back to the host in at least one of the pulse electrical signal, WiFi, Bluetooth and other ways, including but not limited to the indoor and outdoor ambient temperature and humidity of the slave, the outdoor environmental temperature and humidity, the temperature of each key node of the system (such as the temperature of the photovoltaic main board radiator 3 and the temperature of the photovoltaic main board 4), and the user remote control signal. In the scheme of the present application, the setting mode of the host and the slave reduces the cost of the whole-house photovoltaic air conditioning system and enhances the application range of the photovoltaic air conditioning system.

[0085] At step S130, in the current working mode of the photovoltaic inverter system and the air conditioning system in the host, the current parameters of the photovoltaic air conditioning system are obtained in the current heat dissipation mode of the photovoltaic air conditioning system. The current parameters of the photovoltaic air conditioning system include the current environmental parameters of the photovoltaic air conditioning system and the current operating parameters of the photovoltaic air conditioning system.

[0086] At step S140, according to the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to realize the temperature control of the photovoltaic main board 4 and / or the outdoor unit main board of the host.

[0087] The scheme of the present application provides a photovoltaic direct-current air conditioning system with the characteristics of master and slave machines, the master machine has a photovoltaic inverter system and an air conditioning system, and can be used in cooperation with a photovoltaic system and an alternating current power grid, and can provide direct-current power for the air conditioning system of the master machine and / or the air conditioning system of the slave machine through the access of a photovoltaic master board and alternating current, the slave machine only has an air conditioning system, and the power supply of the slave machine is provided by the master machine. At the same time, through the design, installation flexibility can be realized, the number of master machines and slave machines can be selected according to the actual situation of a residence, and advantages such as flexible installation and improved reliability of the master and slave machines are achieved, and the slave machine does not need a conversion system, and the cost can be greatly reduced. Compared with related schemes, the photovoltaic direct-current air conditioning system provided by the scheme of the present application has the advantages of convenient installation (can be installed before and after decoration) and flexible use (different master and slave machine refrigeration systems are independently switched). And since the power consumption of the photovoltaic control master board is large, in order to meet the heat dissipation requirements of the master board, the scheme of the present application further provides a temperature control device for the photovoltaic master board radiator and the outdoor master board radiator in the case of cooperative operation of the master and slave machines, so as to increase the reliability of the photovoltaic air conditioning system.

[0088] In some embodiments, in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the master machine in step S140 is the pure photovoltaic mode, and the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode of air cooling the photovoltaic master board radiator 3 by using the outdoor machine fan of the master machine, the current heat dissipation mode of the photovoltaic air conditioning system is controlled according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic master board 4 and / or the outdoor master board of the master machine, including: a first control process of the air cooling heat dissipation mode of air cooling the photovoltaic master board radiator 3 in the pure photovoltaic mode.

[0089] The following will be described in combination with Figure 2 An embodiment flowchart of the air cooling heat dissipation mode of air cooling the photovoltaic master board radiator 3 in the pure photovoltaic mode in the method of the present application shown in FIG. 10, which further illustrates the specific process of the air cooling heat dissipation mode of air cooling the photovoltaic master board radiator 3 in the pure photovoltaic mode in step S140, including: steps S210 to S220.

[0090] In step S210, in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the master machine is the pure photovoltaic mode, the current parameters of the photovoltaic air conditioning system are determined as: the current temperature of the photovoltaic master board 4 and the current outdoor environment temperature of the master machine.

[0091] In step S220, according to the current temperature of the photovoltaic main board 4 and the current outdoor environment temperature of the main machine, the target rotating speed of the outdoor fan of the main machine is determined according to a preset first formula, and the outdoor fan of the main machine is controlled to operate at the target rotating speed of the outdoor fan of the main machine, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further control the temperature of the photovoltaic main board 4.

[0092] The preset first formula is as follows:

[0093] R = R0 + K1 * (T s -T _out ) + K2 * (T s -T _out ) 2 .

[0094] R is the target rotating speed of the outdoor fan of the main machine, R0 is the rotating speed reference value of the outdoor fan of the main machine, K1 is a preset first control system, K2 is a preset second control coefficient, T s is the current temperature of the photovoltaic main board 4, and T _out is the current outdoor environment temperature of the main machine.

[0095] Specifically, in the refrigeration mode, the temperature control device of the photovoltaic main board radiator and the outdoor main board radiator of the photovoltaic air conditioning system in different air conditioning operation modes further comprises the following steps: in step 21, in the pure photovoltaic mode, AC power is connected, the photovoltaic main board is started to perform photovoltaic input, the air conditioner is not operated, and only photovoltaic grid-connected operation is realized. At this time, the compressor of the photovoltaic air conditioning system is not operated, and the indoor units of the main machine and the slave machine are not started. Since the photovoltaic air conditioning system does not perform refrigeration operation, no condensate water is generated at this time, so the photovoltaic air conditioning system in the pure photovoltaic mode will only use the air cooling heat dissipation mode to dissipate the heat generated by the photovoltaic main board 4.

[0096] In the air cooling heat dissipation mode, in order to achieve the best heat dissipation effect, the rotating speed of the fan is controlled based on the temperature of the photovoltaic main board 4 and the outdoor environment temperature, and the specific control logic is as follows:

[0097] R = R0 + K1 * (T s -T _out ) + K2 * (T s -T _out ) 2 .

[0098] T s is the temperature of the photovoltaic main board 4, and T _outR represents the current outdoor ambient temperature, and R represents the fan speed. R0 is the wind speed reference value, which is the baseline value at which the fan speed should be maintained under a given ambient temperature. K1 and K2 are control coefficients used to control the impact of the photovoltaic mainboard 4's temperature on the fan speed. K1 represents a linear control coefficient, and K2 represents a quadratic control coefficient. Using this formula, the fan speed (i.e., the outdoor fan speed of the main unit) can be adjusted according to changes in the temperature of the photovoltaic mainboard 4 and the outdoor ambient temperature to achieve optimal heat dissipation while minimizing energy consumption.

[0099] In some embodiments, when the current operating mode of the photovoltaic converter system and the air conditioning system in the host is the pure air conditioning mode, and the current heat dissipation method of the photovoltaic air conditioning system is the air cooling method of using the outdoor unit fan of the host to perform air cooling on the outdoor unit motherboard heat sink of the host, step S140 controls the current heat dissipation method of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system to achieve temperature control of the photovoltaic motherboard 4 and / or the outdoor unit motherboard of the host. It also includes a second control process of the air cooling method of performing air cooling on the photovoltaic motherboard heat sink 3 and the outdoor unit motherboard of the host in the pure air conditioning mode.

[0100] The following is combined with Figure 3 The diagram shows an embodiment of the air-cooling method for the photovoltaic mainboard heat sink 3 and the outdoor mainboard of the host in pure air-conditioning mode. It further illustrates the specific process of the air-cooling method for the photovoltaic mainboard heat sink 3 and the outdoor mainboard of the host in pure air-conditioning mode in step S140, including steps S310 to S330.

[0101] Step S310: When the current operating mode of the photovoltaic converter system and the air conditioning system in the host is the pure air conditioning mode, the current parameters of the photovoltaic air conditioning system are determined as follows: the current temperature of the outdoor main board of the host, the current outdoor ambient temperature of the host, the current operating frequency of the compressor of the host, the current temperature of the photovoltaic main board 4, the current outdoor ambient humidity of the host, the current temperature of the photovoltaic main board radiator 3, the current indoor ambient temperature of the host, and the current indoor ambient temperature of all slave units.

[0102] Step S320: Based on the current temperature of the outdoor unit motherboard of the host, the current outdoor ambient temperature of the host, and the current operating frequency of the compressor of the host, the target speed of the outdoor unit fan of the host is determined according to the preset second formula, and the outdoor unit fan of the host is controlled to run at the target speed of the outdoor unit fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, thereby realizing the temperature control of the outdoor unit motherboard of the host.

[0103] Step S330, according to the current temperature of the photovoltaic main board 4, and in combination with the current running frequency of the compressor of the main machine, the current temperature of the photovoltaic main board 4, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator 3, the current outdoor environment temperature of the main machine, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all the slave machines, control the opening and closing of the first switch, the second switch and the third switch, and control the opening degree of the second switch, to realize the control of the current heat dissipation mode of the photovoltaic air conditioning system, and further realize the temperature control of the photovoltaic main board 4.

[0104] Wherein, the preset second formula is:

[0105] R = R0 + K3 * T _out / T0 + K4 * (f _comp / f _max ) 2 .

[0106] Wherein, R is the target rotating speed of the outdoor unit fan of the main machine, R0 is the rotating speed reference value of the outdoor unit fan of the main machine, K3 is a preset third control system, K4 is a preset fourth control coefficient, T0 is the current temperature of the main board of the outdoor unit of the main machine, T _out is the current outdoor environment temperature of the main machine, f _comp is the current running frequency of the compressor of the main machine, f _max is the preset maximum running frequency of the compressor of the main machine.

[0107] Specifically, in the refrigeration mode, the temperature control device of the photovoltaic main board radiator and the outdoor unit main board in different air conditioning operation modes of the photovoltaic air conditioning system further comprises: step 22, in the pure air conditioning mode, the photovoltaic main board 4 does not perform grid-connected operation, the photovoltaic air conditioning system is connected to the mains alternating current, and the operation of the photovoltaic main board 4 only generates relatively small heat of control information such as rectification, filtering and voltage boosting of the outdoor unit controller. The temperature change of the photovoltaic main board radiator 3 is not used as a basis for judging the rotating speed of the fan, but the outdoor unit main board radiator needs to be controlled by changing the rotating speed of the fan in the pure air conditioning mode. Since the outdoor unit main board has no temperature bag, the control logic of the fan rotating speed in the pure air conditioning mode is as follows: R = R0 + K3 * T _out / T0 + K4 * (f _comp / f _max ) 2 .

[0108] Wherein, K3 and K4 are control coefficients for controlling the influence of the temperature of the photovoltaic main board on the rotating speed of the fan. K3 represents a linear control coefficient, and K4 represents a quadratic control coefficient. f _compfmax _max fmax

[0109] In some embodiments, when the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure air conditioning mode, and the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode of using the outdoor fan of the host to air cool the heat sink of the outdoor mainboard of the host, according to the current temperature of the photovoltaic mainboard 4, and in combination with the current running frequency of the compressor of the host, the current temperature of the photovoltaic mainboard 4, the current outdoor environment humidity of the host, the current temperature of the photovoltaic mainboard heat sink 3, the current outdoor environment temperature of the host, the current indoor environment temperature of the host, and the current indoor environment temperature of all the slaves, the opening and closing of the first switch, the second switch and the third switch are controlled, and the opening degree of the second switch is controlled, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further to control the temperature of the photovoltaic mainboard 4, including: when the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure air conditioning mode, if the current temperature of the photovoltaic mainboard 4 is less than the first preset temperature of the photovoltaic mainboard 4, the first switch is controlled to be in the open state, the second switch is controlled to be in the off state, and the third switch is controlled to be in the open state. If the current temperature of the photovoltaic mainboard 4 is greater than or equal to the first preset temperature of the photovoltaic mainboard 4, the second switch is controlled to be in the open state, the target opening degree of the second switch is determined according to the third preset formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further to control the temperature of the photovoltaic mainboard 4.

[0110] The third preset formula is:

[0111] K _valve = (a * f _comp / f _max ) 2 * RH * b * [(T _cond – T1) / (T _cond – T _out )] + c * [(T in1 + T _in2 + … + T _inn ) / n].

[0112] K _valve is the target opening degree of the second switch, f _comp is the current running frequency of the compressor of the host, f _maxT is the preset maximum operating frequency of the compressor of the host machine, RH is the current outdoor ambient humidity of the host machine, T _cond T is the current temperature of the photovoltaic main board radiator 3, T _out T is the current outdoor ambient temperature of the host machine in1 T is the current indoor ambient temperature of the host machine _in2 T is the current indoor ambient temperature of the first slave machine among all slave machines _inn T is the current indoor ambient temperature of the n-1th slave machine among all slave machines, n is the total number of the host machine + all slave machines, a is a preset first correction coefficient, b is a preset second correction coefficient, and c is a preset third correction coefficient.

[0113] Specifically, in the cooling mode, the temperature control device of the photovoltaic main board radiator and the outdoor machine main board radiator in different air conditioning operating modes of the photovoltaic air conditioning system further comprises: in step 22, the control logic of the fan speed in the pure air conditioning mode is R=R0+K3*T _out / T0+K4*(f _comp / f _max ) 2 After control, at this time the temperature sensing bag embedded in the photovoltaic main board radiator 3 detects that the temperature of the photovoltaic main board 4 is Ts, when the temperature Ts of the photovoltaic main board 4 is less than the first preset temperature T1 of the photovoltaic main board 4, the first switch S1 and the third switch S3 are opened, and the second switch S2 is closed. When the temperature Ts of the photovoltaic main board 4 is greater than the first preset temperature T1 of the photovoltaic main board 4, the second switch S2 of the water storage box is opened, and when the second switch S2 is a two-way valve, the opening degree control logic of the two-way valve is as follows:

[0114] The control logic of the photovoltaic air conditioning system using the water cooling heat dissipation mode, wherein the input quantities include the indoor ambient temperatures T _in1 , T _in2 , T _in3 … of the host and slave machines, the outdoor ambient temperature T _out , the temperature T _cond of the photovoltaic main board radiator 3, the compressor frequency f _comp , the outdoor air humidity RH and the main board power P _main , the opening degree K _valve of the two-way valve of the water storage box.

[0115] The control logic formula of the opening degree K _valve of the two-way valve of the water storage box is as follows:

[0116] K _valve =(a*f _comp / f _max ) 2 *RH*b*[(T _cond- T1) / (T _cond - T1) / (T _out - T1) / (T in1 - T1) / (T _in2 - T1) / (T _inn - T1) / (T

[0117] wherein f _comp is the current frequency of the compressor, f _max is the maximum frequency at which the compressor can operate, RH is the current outdoor air humidity, T _cond is the current temperature of the photovoltaic main board radiator 3, T1 is the first preset temperature of the photovoltaic main board 4, T _out is the current outdoor ambient temperature, T in1 is the current indoor ambient temperature of the master, T _in2 is the current indoor ambient temperature of the first slave, T _inn is the current indoor ambient temperature of the n-1th slave, n is the number of master + slave, a, b, c are adjustable correction coefficients, and the best values can be obtained through experiments and optimization.

[0118] The photovoltaic air conditioning system uses a water-cooled heat dissipation mode control logic, which needs to be run on the outdoor unit main board, obtains input quantities by reading sensors, and controls the opening degree of the two-way valve of the water storage box to realize cooling control of the photovoltaic air conditioning system radiator.

[0119] In some embodiments, in step S140, the current working mode of the photovoltaic inverter system and the air conditioning system in the master is the photovoltaic hybrid operation mode, the current heat dissipation mode of the photovoltaic air conditioning system is the first water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 uses condensed water for water-cooled heat dissipation, the air-cooled heat dissipation mode in which the photovoltaic main board radiator 3 and the outdoor unit main board radiator of the master are air-cooled by the outdoor unit fan of the master, and the second water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 is water-cooled by a preset water pump circulation system of the water storage box, and in the case of the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to realize temperature control of the photovoltaic main board 4 and / or the outdoor unit main board of the master, and further comprising: a third control process of the first water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 uses condensed water for water-cooled heat dissipation, the air-cooled heat dissipation mode in which the photovoltaic main board radiator 3 and the outdoor unit main board radiator of the master are air-cooled by the outdoor unit fan of the master, and the second water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 is water-cooled by a preset water pump circulation system of the water storage box in the photovoltaic hybrid operation mode.

[0120] The following will be described in combination with Figure 4An embodiment flowchart of a first water-cooling heat dissipation mode of the photovoltaic main board radiator 3 using condensed water for water-cooling heat dissipation, a wind-cooling heat dissipation mode of the photovoltaic main board radiator 3 and the outdoor main board radiator of the main machine using the outdoor fan of the main machine for wind-cooling heat dissipation, and a second water-cooling heat dissipation mode of the photovoltaic main board radiator 3 using a preset water pump circulation system of the water storage box for water-cooling heat dissipation in the photovoltaic hybrid operation mode of the method of the present application is further used to illustrate the specific process of the first water-cooling heat dissipation mode of the photovoltaic main board radiator 3 using condensed water for water-cooling heat dissipation, the wind-cooling heat dissipation mode of the photovoltaic main board radiator 3 and the outdoor main board radiator of the main machine using the outdoor fan of the main machine for wind-cooling heat dissipation, and the second water-cooling heat dissipation mode of the photovoltaic main board radiator 3 using a preset water pump circulation system of the water storage box for water-cooling heat dissipation in step S140, and includes steps S410 to S430.

[0121] In step S410, when the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, the current parameters of the photovoltaic air conditioning system are determined, including the current temperature of the photovoltaic main board 4, the current outdoor environment temperature of the main machine, the current running frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator 3, the current indoor environment temperature of the main machine, the current indoor environment temperature of all slave machines, and the photovoltaic power generation amount of the photovoltaic inverter system in the main machine.

[0122] In step S420, when the photovoltaic power generation amount of the photovoltaic inverter system in the main machine is lower than the preset power threshold, the target rotating speed of the outdoor fan of the main machine is determined according to the current temperature of the photovoltaic main board 4, the current outdoor environment temperature of the main machine, the current running frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator 3, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, and the target opening degree of the second switch is determined according to the fourth formula and the fifth formula, respectively, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further control the temperature of the photovoltaic main board 4 and the outdoor main board of the main machine.

[0123] Step S430, in the case that the photovoltaic power generation amount of the photovoltaic inverter system in the host is not less than the preset power threshold, determining the target rotating speed of the outdoor unit fan of the host according to the current temperature of the photovoltaic main board 4, the current outdoor environment temperature of the host, the current operating frequency of the compressor of the host, the current outdoor environment humidity of the host, the current temperature of the photovoltaic main board radiator 3, the current indoor environment temperature of the host, and the current indoor environment temperature of all the slaves, according to a preset sixth formula, and controlling the outdoor unit fan of the host to operate at the target rotating speed of the outdoor unit fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further realize the temperature control of the photovoltaic main board 4 and the outdoor main board of the host. And determining the target opening degree of the second switch according to a preset seventh formula, and controlling the opening degree of the second switch to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further realize the temperature control of the photovoltaic main board 4.

[0124] The preset fourth formula is:

[0125] R=(A-A _min ) / (A1-A _min )*R _min +K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0126] The preset fifth formula is:

[0127] K _valve =(a*f _comp / f _max )2*RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T _in1 +T _in2 +…+T _inn ) / n]。

[0128] The preset sixth formula is:

[0129] R=R0+K1*(T s -T _out )+K2*(T s -T _out ) 2 +K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0130] The preset seventh formula is:

[0131] K _valve =(A–A1) / (A _max –A1)*K _max .

[0132] Wherein, R is the target speed of the outdoor unit fan of the host, R0 is the speed reference value of the outdoor unit fan of the host, K1 is the preset first control system, K2 is the preset second control coefficient, K3 is the preset third control system, K4 is the preset fourth control coefficient, T s is the current temperature of the photovoltaic main board 4, T _out is the current outdoor environment temperature of the host, f _comp is the current running frequency of the compressor of the host, f _max is the preset maximum running frequency of the compressor of the host, RH is the current outdoor environment humidity of the host, T _cond is the current temperature of the photovoltaic main board radiator 3, T1 is the first preset temperature of the photovoltaic main board 4, T in1 is the current indoor environment temperature of the host, T _in2 is the current indoor environment temperature of the first slave among all slaves, T _inn is the current indoor environment temperature of the n-1th slave among all slaves, n is the total number of the host + all slaves, a is the preset first correction coefficient, b is the preset second correction coefficient, c is the preset third correction coefficient, K _valve is the target opening degree of the second switch, A is the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _min is the minimum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _max is the maximum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host. A1 is the preset power threshold. R _min is the minimum value of the speed of the outdoor unit fan of the host, K _max is the maximum opening degree of the second switch.

[0133] Specifically, in the refrigeration mode, the temperature control device of the photovoltaic main board radiator and the outdoor unit main board radiator in different air conditioning operation modes of the photovoltaic air conditioning system further comprises: step 23, in the photovoltaic hybrid operation mode of the photovoltaic air conditioning system, the photovoltaic air conditioning system needs to monitor the temperature and other data of the photovoltaic main board 4 and the air conditioning system, and automatically start the fan and the water pump circulating system of the water storage box according to the situation to dissipate heat, and control the flow of the condensate water of the water storage box. Therefore, the control logic of the fan speed and the opening degree of the two-way valve of the water storage box needs to consider the influence of photovoltaic power generation. The fan speed and the opening degree of the two-way valve of the water storage box need to be dynamically adjusted according to the change of the photovoltaic power generation to ensure the stability and efficiency of the photovoltaic air conditioning system.

[0134] According to the change of the photovoltaic power generation, the fan speed R and the opening degree K of the two-way valve of the water storage box are dynamically adjusted _valve The formula of the control logic can be expressed as:

[0135] When the photovoltaic power generation is lower than a certain threshold value:

[0136] R=(A-A _min ) / (A1-A _min )*R _min +K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0137] K _valve =(a*f _comp / f _max )2*RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T _in1 +T _in2 +…+T _inn ) / n]。

[0138] When the photovoltaic power generation is higher than a certain threshold value:

[0139] R=R0+K1*(T s -T _out )+K2*(T s -T _out ) 2 +K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0140] K _valve =(A–A1) / (A _max –A1)*K _max.

[0141] Wherein, A is the current photovoltaic power generation amount. _min And A _max are the minimum and maximum values of the photovoltaic power generation amount. A1 is a threshold value, that is, a critical value of the photovoltaic power generation amount. _min K is the minimum value of the fan speed. _max K is the maximum opening degree of the two-way valve. _comp f is the current operating frequency of the compressor. _max f is the maximum operating frequency of the compressor. RH is the current outdoor air humidity. _cond T is the current temperature of the photovoltaic main board radiator 3. T1 is the first preset temperature of the photovoltaic main board 4. _out T is the current outdoor environment temperature. in1 T is the current indoor environment temperature of the host. _in2 T is the current indoor environment temperature of the first slave. _inn T is the current indoor environment temperature of the n-1th slave. n is the number of hosts + slaves. a, b, and c are adjustable correction coefficients, and the best values can be obtained through experiments and optimization. K1 and K2 are control coefficients for controlling the influence of the temperature of the photovoltaic main board 4 on the fan speed. K1 represents a linear control coefficient, and K2 represents a quadratic control coefficient. K3 and K4 are control coefficients for controlling the influence of the temperature of the photovoltaic main board on the fan speed. K3 represents a linear control coefficient, and K4 represents a quadratic control coefficient.

[0142] The scheme of the present application is based on the concept of host and slave. The photovoltaic main board radiator 3 is embedded with a temperature sensing bag and a disc-shaped water pipe. In addition to using water cooling heat exchange, it can also use negative pressure generated by the rotation of the axial flow fan blade to exchange heat. The condensate generated by the indoor unit during refrigeration is connected to the outdoor for water cooling of the photovoltaic main board. The fan achieves optimal cooling scheme through logical control. It can achieve optimal solution in different modes. It is suitable for small households or air conditioning environments that need flexible cooling arrangement. It expands the application range of the photovoltaic air conditioning system and is energy-saving.

[0143] The technical scheme is adopted in the embodiment, the master and the slave are set for the photovoltaic air conditioning system, the master has the photovoltaic current conversion system and the air conditioning system, the slave only has the air conditioning system, the air conditioning system of the master includes the indoor unit and the outdoor unit, the air conditioning system of the slave also includes the indoor unit and the outdoor unit, the master is responsible for processing the input power and supplying power according to the required load of each slave to drive the air conditioning system of the slave to operate, and the master controls the operation of the slave. The outdoor unit of the master side has a water storage box, a first switch is arranged on the condensate water inlet passage of the water storage box, a second switch is arranged on the passage of the condensate water into the radiator and the second switch is a two-way valve with adjustable opening degree, and a third switch is arranged on the condensate water drainage passage of the water storage box. The working mode of the photovoltaic air conditioning system includes the pure photovoltaic mode, the pure air conditioning mode and the pure air conditioning mode, the opening and closing states of the first switch, the second switch and the third switch are controlled to prevent the condensate water from entering the indoor in the case that the photovoltaic air conditioning system is turned off, and at least one of the speed of the outdoor fan in the air cooling heat dissipation mode and the opening degree of the second switch in the water cooling heat dissipation mode is controlled according to at least one of the temperature of the photovoltaic mainboard, the outdoor environment temperature, the outdoor fan speed, the compressor operation frequency, the current indoor environment temperature of the master and the slave, the outdoor air humidity, the number of the master and the slave and the photovoltaic power generation capacity in the different working modes of the photovoltaic air conditioning system after the photovoltaic air conditioning system is turned on, so that the temperature of the outdoor unit mainboard and the photovoltaic mainboard of the master is controlled by using different heat dissipation modes in the different working modes of the master and the slave. Therefore, by setting the master and the slave, the temperature of the outdoor unit mainboard and the photovoltaic mainboard of the master is controlled by using different heat dissipation modes, which is suitable for small households or needs to arrange the cooling capacity flexibly and is beneficial to energy saving.

[0144] According to the embodiment of the application, a control device of a photovoltaic air conditioning system corresponding to the control method of the photovoltaic air conditioning system is also provided. Referring to Figure 5Structure diagram of an embodiment of the device of the application. The photovoltaic air conditioning system comprises a master and slaves, the master has both a photovoltaic inverter system and an air conditioning system, and all the slaves have only air conditioning systems. The photovoltaic inverter system has a photovoltaic main board 4 and a photovoltaic main board radiator 3 for dissipating heat from the photovoltaic main board 4, and the photovoltaic main board radiator 3 has a water cooling pipe inside. The air conditioning system of the master has an indoor unit and an outdoor unit, and the air conditioning systems of all the slaves also have indoor units and outdoor units. The outdoor unit of the master has an outdoor unit main board and an outdoor unit main board radiator for dissipating heat from the outdoor unit main board of the master. The photovoltaic main board radiator 3 and the outdoor unit main board radiator of the master are both arranged in the outdoor unit air duct cavity of the master, so that the photovoltaic main board radiator 3 and / or the outdoor unit main board radiator of the master are cooled by the outdoor unit fan of the master. Outside the casing of the outdoor unit of the master, a water storage box groove 2 is arranged, and a water storage box is arranged in the water storage box groove 2. A first passage, a second passage and a third passage are arranged outside the water storage box, the first passage is used to receive condensed water generated by the outdoor unit of the master and input into the inside of the water storage box, the second passage is used to transport the condensed water collected in the inside of the water storage box to the water cooling pipe inside the photovoltaic main board radiator 3 so that the photovoltaic main board radiator 3 is water-cooled by the condensed water, and the third passage is used to receive the condensed water after the photovoltaic main board radiator 3 is water-cooled by the condensed water and discharge the condensed water combined with the excess condensed water stored in the inside of the water storage box outside. A first switch is arranged at the connection between the first passage and the water storage box, a second switch is arranged at the connection between the second passage and the water storage box, and a third switch is arranged at the connection between the third passage and the water storage box. Specifically, Figure 6 Structure diagram of an embodiment of the master of the photovoltaic air conditioning system. As shown in the figure, Figure 6 The master comprises an inverter control system and an air conditioning system. The inverter control system comprises a control module, a grid-connected module and a heat dissipation module. The air conditioning system comprises an outdoor unit and an indoor unit. The outdoor unit comprises an outdoor unit controller, a compressor, an outdoor fan, an outdoor heat exchanger and a connection assembly, and the outdoor unit controller, the compressor, the outdoor fan and the outdoor heat exchanger are connected through the connection assembly. The indoor unit comprises an indoor unit controller, an indoor fan, an indoor heat exchanger and a connection assembly, and the indoor unit controller, the indoor fan and the indoor heat exchanger are connected through the connection assembly. Figure 7 Structure diagram of an embodiment of the slave of the photovoltaic air conditioning system. As shown in the figure, Figure 7As shown, the unit includes an air conditioning system, which comprises an outdoor unit (outdoor unit) and an indoor unit (indoor unit). The outdoor unit includes an outdoor unit controller, compressor, outdoor fan, outdoor heat exchanger, and connecting components. The outdoor unit controller, compressor, outdoor fan, and outdoor heat exchanger are connected via the connecting components. The indoor unit includes an indoor unit controller, indoor fan, indoor heat exchanger, and connecting components. The indoor unit controller, indoor fan, and indoor heat exchanger are connected via the connecting components. Figure 8 This is a schematic diagram illustrating the configuration of a communication network for a photovoltaic air conditioning system, as shown below. Figure 8 As shown, the main unit converter control system can send control action signals to the main unit outdoor unit controller. The main unit outdoor unit controller can send control action signals to the main unit indoor unit controller. The main unit indoor unit controller can receive user demand signals and, after passing through the main unit outdoor unit controller, feed them back to the main unit converter control system. The main unit outdoor unit controller can also send control action signals to the branch unit outdoor unit controllers. The branch unit outdoor unit controllers can send control action signals to the branch unit indoor unit controllers. The branch unit indoor unit controllers can receive user demand signals and, after passing through the branch unit outdoor unit controllers and the main unit outdoor unit controller, feed them back to the main unit converter control system.

[0145] In this invention, the main unit is responsible for processing the input power and supplying power to each sub-unit according to its required load, driving the air conditioning system of each sub-unit. The main unit distributes the DC power required by each sub-unit. The main unit may have a rectifier system; when the photovoltaic DC power supply is insufficient, the rectifier system can convert the AC power from the grid into DC power to supply the main unit and other sub-units. The main unit may also have an energy storage battery; when the load of the photovoltaic direct-drive air conditioning system is less than the photovoltaic power generation, it can store excess photovoltaic power. The main unit may also have an inverter system; when the battery is fully charged and the photovoltaic direct-drive air conditioning system is unloaded, the inverter system converts the photovoltaic power into AC power and feeds it back to the grid. In this invention, the characteristics of photovoltaic energy are cleverly utilized to improve the practicality and comfort of the photovoltaic air conditioning system.

[0146] Figure 9 This is a schematic diagram of the structure of an embodiment of the outdoor unit of a photovoltaic air conditioning system. Figure 9 As shown, the outdoor unit of a photovoltaic air conditioner includes a photovoltaic main board 4, a photovoltaic main board heat sink 3, and a water storage box 2. The photovoltaic main board heat sink 3 is located below the photovoltaic main board 4, and the water storage box 2 is located on the side wall of the outdoor unit's casing. Figure 9The shown photovoltaic air conditioner outdoor unit is based on the related scheme of household air conditioner, and a photovoltaic control mainboard module (such as photovoltaic mainboard 4) is added. The radiator of the photovoltaic control mainboard module (i.e. photovoltaic mainboard radiator 3) is placed below the photovoltaic mainboard 4. The photovoltaic mainboard radiator 3 uses a tooth-shaped heat dissipation form. A disc-shaped copper pipe is embedded in the photovoltaic mainboard radiator 3. A radiator temperature sensing bag is also added in the photovoltaic mainboard radiator 3, and the radiator temperature sensing bag is connected to the photovoltaic mainboard 4. Figure 9 In the shown example, the placement mode of the photovoltaic mainboard 4 and the photovoltaic mainboard radiator can realize air cooling heat dissipation, and the water storage box can realize water cooling heat dissipation mode. In the refrigeration mode, the generated condensate water in the indoor unit operation process of the master and slave units is collected into the condensate water storage box (such as the water storage box installed in the water storage box groove 2). A condenser drainage branch is arranged before the condensate water enters the water storage box to normally discharge the excess condensate water. Figure 10 The structure diagram of an embodiment of the water storage box in the photovoltaic air conditioner system is shown in Figure 10 As shown, the body of the water storage box has three passages, such as a first passage, a second passage, and a third passage. The first passage is arranged at the upper part of the body of the water storage box, the second passage is arranged at the bottom of the body of the water storage box, and the third passage is arranged at the side of the body of the water storage box. The first passage is used to receive indoor condensate water and enter the inside of the body of the water storage box. The second passage is used to output the accumulated condensate water in the inside of the body of the water storage box to the radiator (such as the photovoltaic mainboard radiator 3). The third passage has two branches. The first branch is used to receive the condensate water flowing back from the radiator (such as the photovoltaic mainboard radiator 3) and flow into the second branch. The second branch is used to discharge the condensate water flowing into the first branch. The second branch is also used to discharge the excess condensate water in the inside of the body of the water storage box to the outside when the condensate water is too much. A control switch is arranged on each passage. For example, a first switch S1 is arranged at the connection between the first passage and the body of the water storage box. A second switch S2 is arranged at the connection between the second passage and the body of the water storage box. A third switch S3 is arranged at the connection between the third passage and the body of the water storage box. Each control switch is equipped with an independent stepping motor. The second switch S2 added in the passage (i.e. the second passage) of the water storage box into the radiator (such as the photovoltaic mainboard radiator 3) can be a two-way valve with variable opening degree. The copper pipe after entering the two-way valve in the process of outputting the accumulated condensate water in the inside of the body of the water storage box to the radiator (such as the photovoltaic mainboard radiator 3) is transported into the embedded copper pipe in the photovoltaic mainboard radiator 3, and the condensate water is discharged by flowing into the drainage branch pipe (such as the second branch of the third passage). The photovoltaic mainboard radiator 3 and the outdoor unit mainboard radiator are arranged in the outdoor unit air duct cavity. The photovoltaic mainboard radiator 3 can use water cooling heat exchange, and can also use the negative pressure generated by the rotation of the axial flow fan blade for heat exchange. Since the power of the outdoor unit mainboard is small, it does not need to be equipped with a water cooling heat dissipation module, and the fan negative pressure system heat exchange can meet the heat dissipation requirement. Figure 10In the shown example, the water cooling mode can be controlled by the two-way valve and the motor.

[0147] In some embodiments, the water cooling pipe inside the photovoltaic main board radiator 3 is a coil pipe. The coil pipe has a condensate water inlet 11 and a condensate water outlet 12. The condensate water inlet 11 is connected to the outlet of the second passage, and the condensate water outlet 12 is connected to the inlet of the third passage.

[0148] Figure 11 The structure diagram of an embodiment of the photovoltaic main board radiator in the photovoltaic air conditioning system, wherein (a) is the structure diagram of the first view of the photovoltaic main board radiator, (b) is the structure diagram of the second view of the photovoltaic main board radiator, and (c) is the structure diagram of the third view of the photovoltaic main board radiator. As shown in Figure 11 As shown, the water cooling pipe inside the photovoltaic main board radiator 3 is a coil pipe, and the coil pipe has a condensate water inlet 11 and a condensate water outlet 12, which can realize the wind cooling and water cooling collaborative operation in the pure photovoltaic mode, the pure air conditioning mode, and the photovoltaic hybrid operation mode.

[0149] Considering that, on the basis of the master-slave machine, since the power consumption of the photovoltaic main board is large, the heat dissipation problem of the photovoltaic main board is a difficulty, therefore, the scheme of the present application proposes a temperature control device of the photovoltaic main board radiator and the outdoor unit main board radiator in different air conditioning operation modes of the photovoltaic air conditioning system, which realizes the collaborative operation of the master and the slave machine when the slave machine exists, and increases the reliability of the photovoltaic air conditioner.

[0150] As shown in Figure 5 The control device of the photovoltaic air conditioning system includes an acquisition unit 102 and a control unit 104.

[0151] The control unit 104 is configured to control the first switch to be in an open state, control the second switch to be in a closed state, and control the third switch to be in an open state to make the excess condensate water stored in the water storage box discharged outdoors in the case that the photovoltaic air conditioning system is shut down. The specific functions and processing of the control unit 104 are described in step S110.

[0152] The control unit 104 is also configured to determine the heat dissipation mode of the photovoltaic air conditioning system as the current heat dissipation mode of the photovoltaic air conditioning system according to the current working mode of the photovoltaic inverter system and the air conditioning system in the main unit when the photovoltaic air conditioning system is powered on and starts the cooling mode. The current working mode of the photovoltaic inverter system and the air conditioning system in the main unit includes any one of the following modes: a pure photovoltaic mode in which the photovoltaic inverter system in the main unit supplies power alone, a pure air conditioning mode in which the photovoltaic inverter system in the main unit does not supply power and only the mains supplies power, and a photovoltaic hybrid operation mode in which the photovoltaic inverter system in the main unit and the mains supply power together. The current heat dissipation mode of the photovoltaic air conditioning system includes at least one of the following: a first water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 is water-cooled by condensate water, an air-cooled heat dissipation mode in which the photovoltaic main board radiator 3 and / or the outdoor main board radiator of the main unit are air-cooled by the outdoor fan of the main unit, and a second water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 is water-cooled by a water pump circulation system of the water storage box. The water pump circulation system of the water storage box is in communication with the water-cooled coil inside the photovoltaic main board radiator 3. The specific functions and processes of the control unit 104 are also described in step S120.

[0153] In some embodiments, the control unit 104 determines the heat dissipation mode of the photovoltaic air conditioning system as the current heat dissipation mode of the photovoltaic air conditioning system according to the current working mode of the photovoltaic inverter system and the air conditioning system in the main unit when the photovoltaic air conditioning system is powered on and starts the cooling mode, including any one of the following heat dissipation mode determination cases:

[0154] The first heat dissipation mode determination case: the control unit 104 is specifically further configured to determine the current heat dissipation mode of the photovoltaic air conditioning system as an air-cooled heat dissipation mode in which the photovoltaic main board radiator 3 is air-cooled by the outdoor fan of the main unit if the current working mode of the photovoltaic inverter system and the air conditioning system in the main unit is the pure photovoltaic mode.

[0155] The second heat dissipation mode determination case: the control unit 104 is specifically further configured to determine the current heat dissipation mode of the photovoltaic air conditioning system as an air-cooled heat dissipation mode in which the outdoor main board radiator of the main unit is air-cooled by the outdoor fan of the main unit if the current working mode of the photovoltaic inverter system and the air conditioning system in the main unit is the pure air conditioning mode.

[0156] The third heat dissipation mode determines the case: the control unit 104 is specifically further configured to determine the current heat dissipation mode of the photovoltaic air conditioning system as follows: if the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the photovoltaic hybrid operation mode, the first water cooling heat dissipation mode of using the condensate water to water cool the photovoltaic mainboard radiator 3, the air cooling heat dissipation mode of using the outdoor fan of the host to air cool the photovoltaic mainboard radiator 3 and the outdoor mainboard radiator of the host, and the second water cooling heat dissipation mode of using the preset water pump circulation system of the water storage box to water cool the photovoltaic mainboard radiator 3.

[0157] Specifically, in the scheme of the present application, since the photovoltaic mainboard 4 may have a module temperature that is too high in a high temperature case, only the refrigeration mode is discussed below. In the refrigeration mode, the temperature control device of the photovoltaic mainboard radiator and the outdoor mainboard radiator of the photovoltaic air conditioning system in different air conditioning operation modes includes:

[0158] Step 1: In the case that the photovoltaic air conditioning system is turned off, the first switch S1 and the third switch S3 in the water storage box are in the normally open state, and the second switch S2 is in the long closed state, so that the excess condensate water stored in the indoor unit pipeline can be normally discharged to prevent the condensate water from flowing into the indoor room. Then, in the case that the photovoltaic air conditioning system is turned on, step 2 is performed.

[0159] Step 2: In the case that the photovoltaic air conditioning system is turned on, the refrigeration is controlled according to the following three modes: the control logic in step 21 in the first mode, i.e. the pure photovoltaic mode, the control logic in step 22 in the second mode, i.e. the pure air conditioning mode, and the control logic in step 23 in the third mode, i.e. the air conditioning photovoltaic hybrid operation mode.

[0160] In the scheme of the present application, the photovoltaic direct drive air conditioning system has a distinction between the host and the slave. The host has both the photovoltaic inverter system and the air conditioning system, and the slave only has the air conditioning system. The air conditioning system of the host includes an indoor unit and an outdoor unit, and the air conditioning system of the slave also includes an indoor unit and an outdoor unit. The host controls the operation of the slave, is the operation, processing and control center of the whole photovoltaic direct drive air conditioning system, and has all the functions of the slave. The slave collects the environmental information of its indoor unit and outdoor unit, and feeds back to the host in at least one of the pulse electrical signal, WiFi, Bluetooth and other ways, including but not limited to the indoor and outdoor ambient temperature and humidity, the outdoor environmental temperature and humidity, the temperature of each key node of the system (such as the temperature of the photovoltaic mainboard radiator 3 and the temperature of the photovoltaic mainboard 4), and the user remote control signal. In the scheme of the present application, the setting mode of the host and the slave reduces the cost of the whole house photovoltaic air conditioning system and enhances the application range of the photovoltaic air conditioning system.

[0161] The acquisition unit 102 is configured to acquire the current parameters of the photovoltaic air conditioning system in the current working mode of the photovoltaic inverter system and the air conditioning system in the photovoltaic air conditioning system and in the current heat dissipation mode of the photovoltaic air conditioning system. The current parameters of the photovoltaic air conditioning system include the current environmental parameters of the photovoltaic air conditioning system and the current running parameters of the photovoltaic air conditioning system. For specific functions and processes of the acquisition unit 102, see step S130.

[0162] The control unit 104 is further configured to control the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic main board 4 and / or the outdoor main board of the main machine. For specific functions and processes of the control unit 104, see step S140.

[0163] The photovoltaic direct-current air conditioning system provided by the scheme has the characteristics of a master machine and a slave machine. The master machine has a photovoltaic inverter system and an air conditioning system, and can be used with a photovoltaic system and an alternating current power grid. Direct current power can be provided for the air conditioning system of the master machine and / or the air conditioning system of the slave machine by connecting the photovoltaic main board and alternating current. The slave machine only has an air conditioning system, and the power supply is provided by the master machine. At the same time, through this design, flexible installation can be realized, and the number of master machines and slave machines can be selected according to the actual situation of the residence. The advantages of flexible installation and improved reliability of the master machine and the slave machine are achieved. At the same time, the slave machine does not need a conversion system, and the cost can be greatly reduced. Compared with related schemes, the photovoltaic direct-current air conditioning system provided by the scheme has the advantages of convenient installation (installation before and after decoration) and flexible use (independent on-off of different master machines and slave machine refrigeration systems). In addition, since the power consumption of the photovoltaic control main board is large, in order to meet the heat dissipation requirements of the main board, the scheme further provides a temperature control device for the photovoltaic main board radiator and the outdoor main board radiator in the case of cooperative operation of the master machine and the slave machine, so as to increase the reliability of the photovoltaic air conditioning system.

[0164] In some embodiments, when the current working mode of the photovoltaic inverter system and the air conditioning system in the master machine is the pure photovoltaic mode, and the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode of using the outdoor fan of the master machine to air cool the photovoltaic main board radiator 3, the control unit 104 controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic main board 4 and / or the outdoor main board of the master machine. The first control process of the air cooling heat dissipation mode of the photovoltaic main board radiator 3 in the pure photovoltaic mode includes the following steps:

[0165] The control unit 104 is further configured to, when the current operating mode of the photovoltaic converter system and the air conditioning system in the host is the pure photovoltaic mode, determine the current parameters of the photovoltaic air conditioning system as: the current temperature of the photovoltaic mainboard 4 and the current outdoor ambient temperature of the host. The specific functions and processing of this control unit 104 are further described in step S210.

[0166] The control unit 104 is further configured to determine the target speed of the outdoor unit fan of the main unit according to a preset first formula based on the current temperature of the photovoltaic main board 4 and the current outdoor ambient temperature of the main unit, and control the outdoor unit fan of the main unit to operate at the target speed, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, thereby achieving temperature control of the photovoltaic main board 4. The specific functions and processing of this control unit 104 are further described in step S220.

[0167] The preset first formula is:

[0168] R = R0 + K1 * (T) s -T _out )+K2*(T s -T _out ) 2 .

[0169] Where R is the target speed of the outdoor unit fan of the host, R0 is the reference speed value of the outdoor unit fan of the host, K1 is the preset first control system, K2 is the preset second control coefficient, and T s T represents the current temperature of the photovoltaic mainboard 4. _out The current outdoor ambient temperature of the host.

[0170] Specifically, in cooling mode, the temperature control device for the photovoltaic mainboard heat sink and the outdoor unit mainboard heat sink of the photovoltaic air conditioning system under different air conditioning operation modes also includes: Step 21, in pure photovoltaic mode, AC power is connected, the photovoltaic mainboard is turned on for photovoltaic input, the air conditioner does not run, only photovoltaic grid-connected operation is achieved, at this time the compressor of the photovoltaic air conditioning system does not run, and the indoor units of both the main and slave units are not turned on. Since the photovoltaic air conditioning system does not perform cooling operation, no condensate is generated at this time, therefore in pure photovoltaic mode the photovoltaic air conditioning system will only use air cooling to dissipate the heat generated by the photovoltaic mainboard 4.

[0171] In the air-cooled heat dissipation method, in order to achieve the best heat dissipation effect, the fan speed is controlled based on the temperature of the photovoltaic mainboard 4 and the outdoor ambient temperature. The specific control logic is as follows:

[0172] R = R0 + K1 * (T) s -T _out )+K2*(Ts -T _out ) 2 .

[0173] wherein, T s is the temperature of the photovoltaic main board 4, T _out is the current outdoor ambient temperature, R is the fan speed. R0 is the wind speed reference value, which is the reference value that the fan speed should maintain at a given ambient temperature. K1 and K2 are control coefficients for controlling the influence of the temperature of the photovoltaic main board 4 on the fan speed. K1 represents a linear control coefficient, and K2 represents a quadratic control coefficient. Through this formula, the fan speed (i.e., the outdoor fan speed of the main machine) can be adjusted according to the changes in the temperature of the photovoltaic main board 4 and the outdoor ambient temperature, so as to achieve the best heat dissipation effect while minimizing energy consumption.

[0174] In some embodiments, the control unit 104, in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, and the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode using the outdoor fan of the main machine to air cool the outdoor main board radiator of the main machine, according to the current parameters of the photovoltaic air conditioning system, controls the current heat dissipation mode of the photovoltaic air conditioning system to achieve temperature control of the photovoltaic main board 4 and / or the outdoor main board of the main machine, further comprising: a second control process of the air cooling heat dissipation mode of the photovoltaic main board radiator 3 and the outdoor main board of the main machine in the pure air conditioning mode, which is specifically as follows:

[0175] The control unit 104 is specifically further configured to, in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, determine the current parameters of the photovoltaic air conditioning system as: the current temperature of the outdoor main board of the main machine, the current outdoor ambient temperature of the main machine, the current operating frequency of the compressor of the main machine, the current temperature of the photovoltaic main board 4, the current outdoor ambient humidity of the main machine, the current temperature of the photovoltaic main board radiator 3, the current indoor ambient temperature of the main machine, and the current indoor ambient temperatures of all slave machines. The specific functions and processes of this control unit 104 are also referred to step S310.

[0176] The control unit 104 is further configured to determine a target rotating speed of the outdoor fan of the host according to the current temperature of the outdoor mainboard of the host, the current outdoor environment temperature of the host, and the current operating frequency of the compressor of the host, and control the outdoor fan of the host to operate at the target rotating speed of the outdoor fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further control the temperature of the outdoor mainboard of the host. The specific functions and processes of the control unit 104 are also described in step S320.

[0177] The control unit 104 is further configured to control the opening and closing of the first switch, the second switch and the third switch, and control the opening degree of the second switch according to the current temperature of the photovoltaic mainboard 4, in combination with the current operating frequency of the compressor of the host, the current temperature of the photovoltaic mainboard 4, the current outdoor environment humidity of the host, the current temperature of the photovoltaic mainboard radiator 3, the current outdoor environment temperature of the host, the current indoor environment temperature of the host, and the current indoor environment temperature of all slave hosts, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further control the temperature of the photovoltaic mainboard 4. The specific functions and processes of the control unit 104 are also described in step S330.

[0178] The preset second formula is:

[0179] R=R0+K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0180] Wherein, R is the target rotating speed of the outdoor fan of the host, R0 is the rotating speed reference value of the outdoor fan of the host, K3 is a preset third control system, K4 is a preset fourth control coefficient, T0 is the current temperature of the outdoor mainboard of the host, T _out is the current outdoor environment temperature of the host, f _comp is the current operating frequency of the compressor of the host, and f _max is the preset maximum operating frequency of the compressor of the host.

[0181] Specifically, in the refrigeration mode, the temperature control device of the photovoltaic main board radiator and the outdoor unit main board radiator in different air conditioning operation modes of the photovoltaic air conditioning system further comprises: step 22, in the pure air conditioning mode, the photovoltaic main board 4 does not perform grid-connected operation, the photovoltaic air conditioning system is connected to the mains alternating current, the operation of the photovoltaic main board 4 only generates relatively small heat of control information such as rectification, filtering and voltage boosting of the outdoor unit controller, the temperature change of the photovoltaic main board radiator 3 is not used as a basis for judging the fan speed, but the outdoor unit main board radiator needs to be logically controlled by changing the fan speed for heat dissipation in the pure air conditioning mode. Since the outdoor unit main board does not have a temperature sensing bag, the control logic of the fan speed in the pure air conditioning mode is as follows: R = R0 + K3 * T _out / T0 + K4 * (f _comp / f _max ) 2 .

[0182] Wherein, K3 and K4 are control coefficients for controlling the influence of the temperature of the photovoltaic main board on the fan speed. K3 represents a linear control coefficient, and K4 represents a quadratic control coefficient. f _comp is the current operating frequency of the compressor, and f _max is the highest frequency at which the compressor can operate.

[0183] In some embodiments, the control unit 104, in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure air conditioning mode, and the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode of using the outdoor fan of the host to air cool the heat sink of the mainboard of the host, controls the opening and closing of the first switch, the second switch and the third switch, and controls the opening degree of the second switch, according to the current temperature of the photovoltaic mainboard 4, in combination with the current running frequency of the compressor of the host, the current temperature of the photovoltaic mainboard 4, the current outdoor environment humidity of the host, the current temperature of the photovoltaic mainboard heat sink 3, the current outdoor environment temperature of the host, the current indoor environment temperature of the host, and the current indoor environment temperature of all the indoor units, to control the current heat dissipation mode of the photovoltaic air conditioning system, thereby realizing temperature control of the photovoltaic mainboard 4. Specifically, the control unit 104 is further configured to, in the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure air conditioning mode, if the current temperature of the photovoltaic mainboard 4 is less than the first preset temperature of the photovoltaic mainboard 4, control the first switch to be in an open state, control the second switch to be in a closed state, and control the third switch to be in an open state. If the current temperature of the photovoltaic mainboard 4 is greater than or equal to the first preset temperature of the photovoltaic mainboard 4, control the second switch to be in an open state, determine the target opening degree of the second switch according to a preset third formula, and control the opening degree of the second switch to be the target opening degree of the second switch, to control the current heat dissipation mode of the photovoltaic air conditioning system, thereby realizing temperature control of the photovoltaic mainboard 4. The preset third formula is:

[0184] K _valve =(a*f _comp / f _max ) 2 *RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T_ in1 +T _in2 +…+T _inn ) / n]。

[0185] wherein K _valve is the target opening degree of the second switch, f _comp is the current running frequency of the compressor of the host, f _max is the preset highest running frequency of the compressor of the host, RH is the current outdoor environment humidity of the host, T _cond is the current temperature of the photovoltaic mainboard heat sink 3, T1 is the first preset temperature of the photovoltaic mainboard 4, T _outT is the current outdoor ambient temperature of the host in1 T is the current indoor ambient temperature of the host _in2 T is the current indoor ambient temperature of the first slave among all slaves _inn T is the current indoor ambient temperature of the n-1th slave among all slaves, n is the total number of the host + all slaves, a is a preset first correction coefficient, b is a preset second correction coefficient, and c is a preset third correction coefficient.

[0186] Specifically, in the refrigeration mode, the temperature control device of the photovoltaic main board radiator and the outdoor unit main board radiator in different air conditioning operation modes of the photovoltaic air conditioning system further comprises: in step 22, the control logic of the fan speed in the pure air conditioning mode is R = R0 + K3 * T _out / T0 + K4 * (f _comp / f _max ) 2 After the control, the temperature of the photovoltaic main board 4 is detected by the temperature sensing bag embedded in the photovoltaic main board radiator 3, and when the temperature Ts of the photovoltaic main board 4 is less than the first preset temperature T1 of the photovoltaic main board 4, the first switch S1 and the third switch S3 are opened, and the second switch S2 is closed. When the temperature Ts of the photovoltaic main board 4 is greater than the first preset temperature T1 of the photovoltaic main board 4, the second switch S2 of the water storage box is opened, and the opening degree control logic of the two-way valve when the second switch S2 is a two-way valve is as follows:

[0187] The control logic of the photovoltaic air conditioning system using the water cooling heat dissipation mode, wherein the input quantities include the indoor ambient temperatures T _in1 , T _in2 , T _in3 … of the host and the slaves, the outdoor ambient temperature T _out , the temperature T _cond of the photovoltaic main board radiator 3, the compressor frequency f _comp , the outdoor air humidity RH and the main board power P _main , and the opening degree K _valve of the two-way valve of the water storage box.

[0188] The control logic formula of the opening degree K _valve of the two-way valve of the water storage box is as follows:

[0189] K _valve = (a * f _comp / f _max ) 2 * RH * b * [(T _cond – T1) / (T _cond – T _out )] + c * [(T in1 + T _in2 + … + T _inn ) / n].

[0190] wherein f _comp is the current frequency of the compressor, f _max is the maximum frequency at which the compressor can operate, RH is the current outdoor air humidity, T _cond is the current temperature of the photovoltaic main board radiator 3, T1 is the first preset temperature of the photovoltaic main board 4, T _out is the current outdoor environment temperature, T in1 is the current indoor environment temperature of the host, T _in2 is the current indoor environment temperature of the first slave, T _inn is the current indoor environment temperature of the n-1th slave, n is the number of hosts + slaves, a, b, c are adjustable correction coefficients, and the best values can be obtained through experiments and optimization.

[0191] The photovoltaic air conditioning system uses the control logic of the water-cooled heat dissipation mode, needs to be operated on the outdoor unit main board, obtains the input quantity by reading the sensor, and controls the opening degree of the two-way valve of the water storage box to realize the cooling control of the photovoltaic air conditioning system radiator.

[0192] In some embodiments, the control unit 104, in the case where the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the photovoltaic hybrid operation mode, the current heat dissipation mode of the photovoltaic air conditioning system is the first water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 utilizes condensed water for water-cooled heat dissipation, the air-cooled heat dissipation mode in which the outdoor unit fan of the host is used to air-cool the photovoltaic main board radiator 3 and the outdoor unit main board radiator of the host, and the second water-cooled heat dissipation mode in which the water pump circulation system of the water storage box is used to water-cool the photovoltaic main board radiator 3, controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, to realize temperature control of the photovoltaic main board 4 and / or the outdoor unit main board of the host, further comprising: a third control process of the first water-cooled heat dissipation mode in which the photovoltaic main board radiator 3 utilizes condensed water for water-cooled heat dissipation, the air-cooled heat dissipation mode in which the outdoor unit fan of the host is used to air-cool the photovoltaic main board radiator 3 and the outdoor unit main board radiator of the host, and the second water-cooled heat dissipation mode in which the water pump circulation system of the water storage box is used to water-cool the photovoltaic main board radiator 3 in the photovoltaic hybrid operation mode, specifically as follows:

[0193] The control unit 104 is further configured to determine the current parameters of the photovoltaic air conditioning system as the current temperature of the photovoltaic main board 4, the current outdoor ambient temperature of the host, the current operating frequency of the compressor of the host, the current outdoor ambient humidity of the host, the current temperature of the photovoltaic main board radiator 3, the current indoor ambient temperature of the host, the current indoor ambient temperature of all slave machines, and the photovoltaic power generation amount of the photovoltaic inverter system in the host when the current operating mode of the photovoltaic inverter system and the air conditioning system in the host is the photovoltaic hybrid operation mode. The specific functions and processes of the control unit 104 are also described in step S410.

[0194] The control unit 104 is further configured to determine the target rotating speed of the outdoor fan of the host according to the current temperature of the photovoltaic main board 4, the current outdoor ambient temperature of the host, the current operating frequency of the compressor of the host, the current outdoor ambient humidity of the host, the current temperature of the photovoltaic main board radiator 3, the current indoor ambient temperature of the host, and the current indoor ambient temperature of all slave machines according to a preset fourth formula when the photovoltaic power generation amount of the photovoltaic inverter system in the host is lower than the preset power threshold, and control the outdoor fan of the host to operate at the target rotating speed of the outdoor fan of the host to control the current heat dissipation mode of the photovoltaic air conditioning system, thereby controlling the temperature of the photovoltaic main board 4 and the outdoor main board of the host. The target opening degree of the second switch is determined according to a preset fifth formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch to control the current heat dissipation mode of the photovoltaic air conditioning system, thereby controlling the temperature of the photovoltaic main board 4. The specific functions and processes of the control unit 104 are also described in step S420.

[0195] The control unit 104 is specifically further configured to, in a case where the photovoltaic power generation amount of the photovoltaic inverter system in the host is not lower than a preset power threshold, determine a target rotating speed of an outdoor unit fan of the host according to the current temperature of the photovoltaic main board 4, the current outdoor environment temperature of the host, the current operating frequency of the compressor of the host, the current outdoor environment humidity of the host, the current temperature of the photovoltaic main board radiator 3, the current indoor environment temperature of the host, and the current indoor environment temperature of all the slaves, according to a preset sixth formula, and control the outdoor unit fan of the host to operate at the target rotating speed of the outdoor unit fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further realize temperature control of the photovoltaic main board 4 and the outdoor main board of the host. And determine the target opening degree of the second switch according to a preset seventh formula, and control the opening degree of the second switch to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, and further realize temperature control of the photovoltaic main board 4. The specific functions and processes of the control unit 104 are also described in step S430.

[0196] The preset fourth formula is:

[0197] R=(A-A _min ) / (A1-A _min )*R _min +K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0198] The preset fifth formula is:

[0199] K _valve =(a*f _comp / f _max )2*RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T _in1 +T _in2 +…+T _inn ) / n]。

[0200] The preset sixth formula is:

[0201] R=R0+K1*(T s -T _out )+K2*(T s -T _out ) 2 +K3*T _out / T0+K4*(f _comp / f _max) 2 .

[0202] The preset seventh formula is:

[0203] K _valve = (A - A1) / (A _max - A1) * K _max .

[0204] Wherein, R is the target speed of the outdoor unit fan of the host, R0 is the speed reference value of the outdoor unit fan of the host, K1 is the preset first control system, K2 is the preset second control coefficient, K3 is the preset third control system, K4 is the preset fourth control coefficient, T s is the current temperature of the photovoltaic main board 4, T _out is the current outdoor environment temperature of the host, f _comp is the current running frequency of the compressor of the host, f _max is the preset maximum running frequency of the compressor of the host, RH is the current outdoor environment humidity of the host, T _cond is the current temperature of the photovoltaic main board radiator 3, T1 is the first preset temperature of the photovoltaic main board 4, T in1 is the current indoor environment temperature of the host, T _in2 is the current indoor environment temperature of the first slave among all slaves, T _inn is the current indoor environment temperature of the n-1th slave among all slaves, n is the total number of the host + all slaves, a is the preset first correction coefficient, b is the preset second correction coefficient, c is the preset third correction coefficient, K _valve is the target opening degree of the second switch, A is the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _min is the minimum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _max is the maximum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host. A1 is the preset power threshold. R _min is the minimum value of the speed of the outdoor unit fan of the host, K _max is the maximum opening degree of the second switch.

[0205] Specifically, in the refrigeration mode, the temperature control device of the photovoltaic main board radiator and the outdoor unit main board radiator in different air conditioning operation modes of the photovoltaic air conditioning system further comprises: step 23, in the photovoltaic hybrid operation mode of the photovoltaic air conditioning system, the photovoltaic air conditioning system needs to monitor the temperature and other data of the photovoltaic main board 4 and the air conditioning system, automatically start the fan and the water storage device for heat dissipation according to the situation, and control the flow of the condensate water in the water storage box. Therefore, the control logic of the fan speed and the opening degree of the two-way valve of the water storage box needs to consider the influence of photovoltaic power generation. The fan speed and the opening degree of the two-way valve of the water storage box need to be dynamically adjusted according to the change of the photovoltaic power generation to ensure the stability and efficiency of the photovoltaic air conditioning system.

[0206] According to the change of the photovoltaic power generation, the fan speed R and the opening degree K of the two-way valve of the water storage box are dynamically adjusted _valve The formula of the control logic can be expressed as:

[0207] When the photovoltaic power generation is lower than a certain threshold:

[0208] R=(A-A _min ) / (A1-A _min )*R _min +K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0209] K _valve =(a*f _comp / f _max )2*RH*b*[(T _cond –T1) / (T _cond -T _out )]+c*[(T _in1 +T _in2 +…+T _inn ) / n]。

[0210] When the photovoltaic power generation is higher than a certain threshold:

[0211] R=R0+K1*(T s -T _out )+K2*(T s -T _out ) 2 +K3*T _out / T0+K4*(f _comp / f _max ) 2 .

[0212] K _valve =(A–A1) / (A _max –A1)*K _max .

[0213] Wherein, A is the current photovoltaic power generation amount. _min And A _max are the minimum and maximum values of the photovoltaic power generation amount. A1 is a threshold value, that is, a critical value of the photovoltaic power generation amount. _min K is the minimum value of the fan speed. _max K is the maximum opening degree of the two-way valve. _comp f is the current operating frequency of the compressor. _max f is the maximum operating frequency of the compressor. RH is the current outdoor air humidity. _cond T is the current temperature of the photovoltaic main board radiator 3. _out T1 is the first preset temperature of the photovoltaic main board 4. in1 T is the current outdoor environment temperature. _in2 T is the current indoor environment temperature of the host. _inn T is the current indoor environment temperature of the first slave. T is the current indoor environment temperature of the n-1th slave, and n is the number of hosts + slaves. a, b, and c are adjustable correction coefficients, and the best values can be obtained through experiments and optimization. K1 and K2 are control coefficients for controlling the influence of the temperature of the photovoltaic main board 4 on the fan speed. K1 represents a linear control coefficient, and K2 represents a quadratic control coefficient. K3 and K4 are control coefficients for controlling the influence of the temperature of the photovoltaic main board on the fan speed. K3 represents a linear control coefficient, and K4 represents a quadratic control coefficient.

[0214] The scheme of the present application is based on the concept of host and slave. The photovoltaic main board radiator 3 and the outdoor unit main board radiator are arranged in the outdoor unit air duct cavity. The temperature sensing bag and the disc-shaped water pipe are embedded in the photovoltaic main board radiator 3. In addition to using water cooling heat exchange, heat exchange can also be performed through negative pressure generated by the rotation of the axial flow fan blade. The condensate water generated by the indoor unit during refrigeration is connected to the outdoor for water cooling of the photovoltaic main board, and the fan cooperates with the logic control to achieve an optimal heat dissipation scheme. The optimal solution can be achieved in different modes. The photovoltaic air conditioning system has a good implementation scheme for small-sized or flexible cooling arrangement environments, expands the application range of the photovoltaic air conditioning system, and is conducive to energy saving.

[0215] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, details not described in the description of the present embodiment can be referred to the related description in the foregoing embodiments, which will not be repeated here.

[0216] The technical scheme of the present application is characterized in that, for the photovoltaic air conditioning system, a master and a slave are arranged, the master has a photovoltaic inverter system and an air conditioning system, the slave has only an air conditioning system, the air conditioning system of the master includes an indoor unit and an outdoor unit, the air conditioning system of the slave also includes an indoor unit and an outdoor unit, the master is responsible for processing the input power and supplying power according to the required load of each slave to drive the air conditioning system of the slave to operate, and the master controls the operation of the slave; the outdoor unit of the master side has a water storage box, a first switch is arranged on the condensate water inlet passage of the water storage box, a second switch, which is a two-way valve with adjustable opening degree, is arranged on the passage through which the condensate water of the water storage box enters the radiator, and a third switch is arranged on the condensate water outlet passage of the water storage box; the working modes of the photovoltaic air conditioning system include a pure photovoltaic mode, a pure air conditioning mode and a pure air conditioning mode, the opening and closing states of the first switch, the second switch and the third switch are controlled to prevent the condensate water from entering the indoor in the case that the photovoltaic air conditioning system is turned off, and at least one of the speed of the outdoor fan in the air cooling mode and the opening degree of the second switch in the water cooling mode is controlled according to at least one of the temperature of the photovoltaic mainboard, the outdoor environment temperature, the speed of the outdoor fan, the operating frequency of the compressor, the current indoor environment temperature of the master and the slave, the outdoor air humidity, the number of the master and the slave and the photovoltaic power generation capacity, so that the temperature of the outdoor unit mainboard and the photovoltaic mainboard of the master is controlled in different working modes of the master and the slave by using different cooling modes, the condensate water generated by the indoor unit during refrigeration is connected to the outdoor for water cooling of the photovoltaic mainboard, and the optimal cooling scheme is realized by the logic control of the fan, the optimal solution can be realized in different modes, the application range of the photovoltaic air conditioning system is expanded, and energy saving is facilitated.

[0217] According to the embodiment of the present application, a photovoltaic air conditioning system corresponding to the control device of the photovoltaic air conditioning system is also provided. The photovoltaic air conditioning system can include the control device of the photovoltaic air conditioning system described above.

[0218] Since the processing and functions realized by the photovoltaic air conditioning system of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, the description of the present embodiment does not go into details, and the relevant description in the foregoing embodiments can be referred to, which will not be repeated here.

[0219] The technical scheme of the present application is characterized in that, for the photovoltaic air conditioning system, a master and a slave are arranged, the master has a photovoltaic inverter system and an air conditioning system, the slave has only an air conditioning system, the air conditioning system of the master includes an indoor unit and an outdoor unit, the air conditioning system of the slave also includes an indoor unit and an outdoor unit, the master is responsible for processing the input power and supplying power according to the required load of each slave to drive the air conditioning system of the slave to operate, and the master controls the operation of the slave; the outdoor unit of the master side has a water storage box, a first switch is arranged on the condensate water inlet passage of the water storage box, a second switch is arranged on the passage through which the condensate water of the water storage box enters the radiator, the second switch is a two-way valve with adjustable opening degree, and a third switch is arranged on the condensate water outlet passage of the water storage box; the working modes of the photovoltaic air conditioning system include a pure photovoltaic mode, a pure air conditioning mode and a pure air conditioning mode, the opening and closing states of the first switch, the second switch and the third switch are controlled to prevent the condensate water from entering the indoor in the case that the photovoltaic air conditioning system is turned off, and at least one of the speed of the outdoor fan in the air cooling mode and the opening degree of the second switch in the water cooling mode is controlled according to at least one of the temperature of the photovoltaic mainboard, the outdoor environment temperature, the speed of the outdoor fan, the operating frequency of the compressor, the current indoor environment temperature of the master and the slave, the outdoor air humidity, the number of the master and the slave and the photovoltaic power generation capacity in the case that the photovoltaic air conditioning system is turned on, so that the temperature of the outdoor unit mainboard and the photovoltaic mainboard of the master is controlled in different working modes of the master and the slave by using different cooling modes, the condensate water generated during refrigeration is used to realize the optimal cooling scheme in cooperation with the fan through logical control, and the reliability of the photovoltaic air conditioning system is improved.

[0220] According to the embodiment of the present application, a storage medium corresponding to the control method of the photovoltaic air conditioning system is also provided, the storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located performs the control method of the photovoltaic air conditioning system.

[0221] Since the processing and functions realized by the storage medium of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the descriptions not described in detail in the present embodiment can be referred to the related descriptions in the foregoing embodiments, which will not be described herein.

[0222] The technical scheme of the present application is characterized in that, for the photovoltaic air conditioning system, a master and a slave are arranged, the master has a photovoltaic inverter system and an air conditioning system, the slave has only an air conditioning system, the air conditioning system of the master comprises an indoor unit and an outdoor unit, the air conditioning system of the slave also comprises an indoor unit and an outdoor unit, the master is responsible for processing input power and supplying power according to the required load of each slave to drive the air conditioning system of the slave to operate, and the master controls the operation of the slave; the outdoor unit of the master side has a water storage box, a first switch is arranged on the condensate water inlet passage of the water storage box, a second switch is arranged on the passage through which the condensate water of the water storage box enters the radiator, the second switch is a two-way valve with adjustable opening degree, and a third switch is arranged on the condensate water outlet passage of the water storage box; the working mode of the photovoltaic air conditioning system comprises a pure photovoltaic mode, a pure air conditioning mode and a pure air conditioning mode, the opening and closing states of the first switch, the second switch and the third switch are controlled to prevent the condensate water from entering the indoor in the case that the photovoltaic air conditioning system is turned off, and at least one of the speed of the outdoor fan in the air cooling mode and the opening degree of the second switch in the water cooling mode is controlled according to at least one of the temperature of the photovoltaic mainboard, the outdoor environment temperature, the speed of the outdoor fan, the operating frequency of the compressor, the current indoor environment temperature of the master and the slave, the outdoor air humidity, the number of the master and the slave and the photovoltaic power generation capacity in the case that the photovoltaic air conditioning system is turned on, so that the temperature of the outdoor mainboard and the photovoltaic mainboard of the master is controlled by using different cooling modes in different working modes of the master and the slave, the temperature control of the photovoltaic mainboard radiator and the outdoor mainboard radiator is realized in the case that the master and the slave operate cooperatively when the slave is present, and the reliability of the photovoltaic air conditioning system is improved.

[0223] In summary, those skilled in the art can easily understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0224] The above only describes the embodiments of the present application and is not used to limit the present application, and those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of a photovoltaic air conditioning system, characterized by, The photovoltaic air conditioning system comprises a master and slaves, the master has a photovoltaic inverter system and an air conditioning system, and all the slaves have only air conditioning systems; the photovoltaic inverter system has a photovoltaic mainboard (4) and a photovoltaic mainboard radiator (3) for heat dissipation of the photovoltaic mainboard (4), and the photovoltaic mainboard radiator (3) has a water cooling pipeline inside; the air conditioning system of the master has an indoor unit and an outdoor unit, and the air conditioning systems of all the slaves also have indoor units and outdoor units; the outdoor unit of the master has an outdoor mainboard and an outdoor mainboard radiator for heat dissipation of the outdoor mainboard of the master; the photovoltaic mainboard radiator (3) and the outdoor mainboard radiator of the master are arranged in the outdoor unit air duct cavity of the master, so that the photovoltaic mainboard radiator (3) and / or the outdoor mainboard radiator of the master are air-cooled and heat-dissipated by the outdoor unit fan of the master; a water storage box is arranged outside the casing of the outdoor unit of the master; a first passage, a second passage and a third passage are arranged outside the water storage box, the first passage is used for receiving condensed water generated by the outdoor unit of the master and inputting the condensed water into the inside of the water storage box, the second passage is used for conveying the condensed water collected in the inside of the water storage box to the water cooling pipeline inside the photovoltaic mainboard radiator (3) to make the photovoltaic mainboard radiator (3) water-cooled and heat-dissipated by the condensed water, and the third passage is used for receiving the condensed water after the condensed water is water-cooled and heat-dissipated by the photovoltaic mainboard radiator (3) and discharging the condensed water to the outside of the room after the condensed water is combined with the excess condensed water stored in the inside of the water storage box; a first switch is arranged at the connection between the first passage and the water storage box, a second switch is arranged at the connection between the second passage and the water storage box, and a third switch is arranged at the connection between the third passage and the water storage box; and the control method of the photovoltaic air conditioning system comprises the following steps: In the case that the photovoltaic air conditioning system is powered off, the first switch is controlled to be in an open state, the second switch is controlled to be in a closed state, and the third switch is controlled to be in an open state, so that the excess condensed water stored in the water storage box is discharged to the outside of the room. In the case that the photovoltaic air conditioning system is started and starts the refrigeration mode, according to the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine, the heat dissipation mode of the photovoltaic air conditioning system is determined, which is recorded as the current heat dissipation mode of the photovoltaic air conditioning system; wherein the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine includes any one of the following modes: the pure photovoltaic mode in which the photovoltaic inverter system in the main machine supplies power alone, the pure air conditioning mode in which the photovoltaic inverter system in the main machine does not supply power and only the mains supplies power, and the photovoltaic hybrid operation mode in which the photovoltaic inverter system in the main machine and the mains supply power together; the current heat dissipation mode of the photovoltaic air conditioning system includes at least one of the following: the first water cooling heat dissipation mode in which the photovoltaic main board radiator (3) is water cooled and heat dissipated by using condensate water, the air cooling heat dissipation mode in which the photovoltaic main board radiator (3) and / or the main machine outdoor unit main board radiator is air cooled and heat dissipated by using the main machine outdoor unit fan, and the second water cooling heat dissipation mode in which the photovoltaic main board radiator (3) is water cooled and heat dissipated by using the preset water pump circulation system of the water storage box; the water pump circulation system of the water storage box is in communication with the water cooling coil inside the photovoltaic main board radiator (3); In the current heat dissipation mode of the photovoltaic air conditioning system, the current parameters of the photovoltaic air conditioning system are obtained; the current parameters of the photovoltaic air conditioning system include the current environmental parameters of the photovoltaic air conditioning system and the current operating parameters of the photovoltaic air conditioning system; According to the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to realize temperature control of the photovoltaic main board (4) and / or the main machine outdoor unit main board.

2. The control method of the photovoltaic air conditioning system according to claim 1, wherein Wherein, The water storage box groove (2) is arranged outside the shell of the main machine outdoor unit, and the water storage box is arranged in the water storage box groove (2); the water cooling pipe inside the photovoltaic main board radiator (3) is a coil; the coil has a condensate water inlet (11) and a condensate water outlet (12); the condensate water inlet (11) is in communication with the outlet of the second passage, and the condensate water outlet (12) is in communication with the inlet of the third passage.

3. The control method of the photovoltaic air conditioning system according to claim 1 or 2, characterized in that, According to the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine, the heat dissipation mode of the photovoltaic air conditioning system is determined, which is recorded as the current heat dissipation mode of the photovoltaic air conditioning system, including: If the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure photovoltaic mode, then the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode in which the photovoltaic main board radiator (3) is air cooled and heat dissipated by using the main machine outdoor unit fan; If the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, then the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode in which the main machine outdoor unit main board radiator is air cooled and heat dissipated by using the main machine outdoor unit fan; If the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the photovoltaic hybrid operation mode, the current heat dissipation mode of the photovoltaic air conditioning system is: a first water-cooling heat dissipation mode in which the photovoltaic mainboard radiator (3) is water-cooled by condensate water, an air-cooling heat dissipation mode in which the photovoltaic mainboard radiator (3) and the outdoor mainboard radiator of the host are air-cooled by the outdoor fan of the host, and a second water-cooling heat dissipation mode in which the photovoltaic mainboard radiator (3) is water-cooled by a water pump circulation system of the preset water storage box.

4. The control method of the photovoltaic air conditioning system according to claim 3, wherein, According to the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to realize temperature control of the photovoltaic mainboard (4) and / or the outdoor mainboard of the host, including: In the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure photovoltaic mode, the current parameters of the photovoltaic air conditioning system are determined as: the current temperature of the photovoltaic mainboard (4), the current outdoor environment temperature of the host; According to the current temperature of the photovoltaic mainboard (4) and the current outdoor environment temperature of the host, the target rotating speed of the outdoor fan of the host is determined according to a preset first formula, and the outdoor fan of the host is controlled to operate at the target rotating speed of the outdoor fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; The preset first formula is: R = R0 + K1 (T s -T _out )+K2 (T s -T _out ) 2 ; Wherein, R is the target rotating speed of the outdoor unit fan of the host, R0 is the rotating speed reference value of the outdoor unit fan of the host, K1 is a preset first control system, K2 is a preset second control coefficient, T s is the current temperature of the photovoltaic main board (4), T _out is the current outdoor environment temperature of the host.

5. The control method of the photovoltaic air conditioning system according to claim 3, wherein, According to the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to realize temperature control of the photovoltaic mainboard (4) and / or the outdoor mainboard of the host, including: In the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure photovoltaic mode, the current parameters of the photovoltaic air conditioning system are determined as: the current temperature of the photovoltaic mainboard (4), the current outdoor environment temperature of the host; According to the current temperature of the photovoltaic mainboard (4) and the current outdoor environment temperature of the host, the target rotating speed of the outdoor fan of the host is determined according to a preset first formula, and the outdoor fan of the host is controlled to operate at the target rotating speed of the outdoor fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; According to the current temperature of the photovoltaic main board (4), and in combination with the current running frequency of the compressor of the main machine, the current temperature of the photovoltaic main board (4), the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator (3), the current outdoor environment temperature of the main machine, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, the opening and closing of the first switch, the second switch and the third switch are controlled, and the opening degree of the second switch is controlled, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; The preset second formula is: R = R0 + K3 T _out / T0 + K4 (f _comp / f _max ) 2 ; Wherein, R is the target rotating speed of the outdoor fan of the host, R0 is the rotating speed reference value of the outdoor fan of the host, K3 is a preset third control system, K4 is a preset fourth control coefficient, T0 is the current temperature of the mainboard of the outdoor unit of the host, T _out is the current outdoor environment temperature of the host, f _comp is the current operating frequency of the compressor of the host, f _max is the preset maximum operating frequency of the compressor of the host.

6. The control method of the photovoltaic air conditioning system according to claim 5, wherein, According to the current temperature of the photovoltaic main board (4), and in combination with the current running frequency of the compressor of the main machine, the current temperature of the photovoltaic main board (4), the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator (3), the current outdoor environment temperature of the main machine, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, the opening and closing of the first switch, the second switch and the third switch are controlled, and the opening degree of the second switch is controlled, so as to control the current heat dissipation mode of the photovoltaic air conditioning system, comprising: If the current temperature of the photovoltaic main board (4) is less than the first preset temperature of the photovoltaic main board (4), the first switch is controlled to be in an open state, the second switch is controlled to be in a closed state, and the third switch is controlled to be in an open state; if the current temperature of the photovoltaic main board (4) is greater than or equal to the first preset temperature of the photovoltaic main board (4), the second switch is controlled to be in an open state, the target opening degree of the second switch is determined according to a preset third formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; The preset third formula is: K _valve =(a f _comp / f _max ) 2 RH b [(T _cond –T1) / (T _cond -T _out )]+c [(T_ in1 +T _in2 +…+T _inn ) / n]; wherein K _valve is the target opening degree of the second switch, f _comp is the current operating frequency of the compressor of the host, f _max is the preset maximum operating frequency of the compressor of the host, RH is the current outdoor ambient humidity of the host, T _cond is the current temperature of the photovoltaic main board radiator (3), T1 is the first preset temperature of the photovoltaic main board (4), T _out is the current outdoor ambient temperature of the host, T in1 is the current indoor ambient temperature of the host, T _in2 is the current indoor ambient temperature of the first slave among all the slaves, T _inn is the current indoor ambient temperature of the n-1th slave among all the slaves, n is the total number of the host + all the slaves, a is a preset first correction coefficient, b is a preset second correction coefficient, and c is a preset third correction coefficient.

7. The control method of the photovoltaic air conditioning system according to claim 3, wherein According to the current parameters of the photovoltaic air conditioning system, the current heat dissipation mode of the photovoltaic air conditioning system is controlled to realize temperature control of the photovoltaic main board (4) and / or the outdoor main board of the main machine, further comprising: In the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, the current parameters of the photovoltaic air conditioning system are determined as: the current temperature of the photovoltaic main board (4), the current outdoor environment temperature of the main machine, the current running frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator (3), the current indoor environment temperature of the main machine, the current indoor environment temperature of all slave machines, and the photovoltaic power generation amount of the photovoltaic inverter system in the main machine. In the case that the photovoltaic power generation of the photovoltaic inverter system in the host is lower than the preset power threshold, the target rotating speed of the outdoor unit fan of the host is determined according to the current temperature of the photovoltaic main board (4), the current outdoor environment temperature of the host, the current operating frequency of the compressor of the host, the current outdoor environment humidity of the host, the current temperature of the photovoltaic main board radiator (3), the current indoor environment temperature of the host, and the current indoor environment temperature of all slave units, according to a preset fourth formula, and the outdoor unit fan of the host is controlled to operate at the target rotating speed of the outdoor unit fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; and the target opening degree of the second switch is determined according to a preset fifth formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; In the case that the photovoltaic power generation of the photovoltaic inverter system in the host is not lower than the preset power threshold, the target rotating speed of the outdoor unit fan of the host is determined according to the current temperature of the photovoltaic main board (4), the current outdoor environment temperature of the host, the current operating frequency of the compressor of the host, the current outdoor environment humidity of the host, the current temperature of the photovoltaic main board radiator (3), the current indoor environment temperature of the host, and the current indoor environment temperature of all slave units, according to a preset sixth formula, and the outdoor unit fan of the host is controlled to operate at the target rotating speed of the outdoor unit fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; and the target opening degree of the second switch is determined according to a preset seventh formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; The preset fourth formula is: R = (A - A _min ) / (A1- A _min ) R _min + K3 T _out / T0+ K4 (f _comp / f _max ) 2 ; The preset fifth formula is: K _valve = (a f _comp / f _max )2 RH b [(T _cond –T1) / (T _cond -T _out )]+c [(T _in1 +T _in2 +…+T _inn ) / n] The preset sixth formula is: R = R0 + K1 (T s -T _out )+K2 (T s -T _out ) 2 +K3 T _out / T0+K4 (f _comp / f _max ) 2 ; The preset seventh formula is: K _valve = (A - A1) / (A _max - A1) K _max ; Wherein, R is the target rotating speed of the outdoor unit fan of the host, R0 is the rotating speed reference value of the outdoor unit fan of the host, K1 is the preset first control system, K2 is the preset second control coefficient, K3 is the preset third control system, K4 is the preset fourth control coefficient, T s is the current temperature of the photovoltaic main board (4), T _out is the current outdoor environment temperature of the host, f _comp is the current running frequency of the compressor of the host, f _max is the preset maximum running frequency of the compressor of the host, RH is the current outdoor environment humidity of the host, T _cond is the current temperature of the photovoltaic main board radiator (3), T1 is the first preset temperature of the photovoltaic main board (4), T in1 is the current indoor environment temperature of the host, T _in2 is the current indoor environment temperature of the first slave among all the slaves, T _inn is the current indoor environment temperature of the n-1th slave among all the slaves, n is the total number of the host + all the slaves, a is the preset first correction coefficient, b is the preset second correction coefficient, c is the preset third correction coefficient, K _valve is the target opening degree of the second switch, A is the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _min is the minimum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _max is the maximum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host; A1 is the preset power threshold; R _min is the minimum rotating speed of the outdoor unit fan of the host, K _max is the maximum opening degree of the second switch.

8. A control device of a photovoltaic air conditioning system, characterized in that, The photovoltaic air conditioning system comprises a master and slaves, the master has a photovoltaic inverter system and an air conditioning system, and all the slaves have only air conditioning systems; the photovoltaic inverter system has a photovoltaic mainboard (4) and a photovoltaic mainboard radiator (3) for heat dissipation of the photovoltaic mainboard (4), and the photovoltaic mainboard radiator (3) has a water cooling pipeline inside; the air conditioning system of the master has an indoor unit and an outdoor unit, and the air conditioning systems of all the slaves also have indoor units and outdoor units; the outdoor unit of the master has an outdoor mainboard and an outdoor mainboard radiator for heat dissipation of the outdoor mainboard of the master; the photovoltaic mainboard radiator (3) and the outdoor mainboard radiator of the master are arranged in the outdoor unit air duct cavity of the master, so that the photovoltaic mainboard radiator (3) and / or the outdoor mainboard radiator of the master are air-cooled and heat-dissipated by the outdoor unit fan of the master; a water storage box is arranged outside the casing of the outdoor unit of the master; a first passage, a second passage and a third passage are arranged outside the water storage box, the first passage is used for receiving condensed water generated by the outdoor unit of the master and inputting the condensed water into the inside of the water storage box, the second passage is used for conveying the condensed water collected in the inside of the water storage box to the water cooling pipeline inside the photovoltaic mainboard radiator (3) to make the photovoltaic mainboard radiator (3) water-cooled and heat-dissipated by the condensed water, and the third passage is used for receiving the condensed water after the condensed water is water-cooled and heat-dissipated by the photovoltaic mainboard radiator (3) and discharging the condensed water to the outside of the room after the condensed water is combined with the excess condensed water stored in the inside of the water storage box; a first switch is arranged at the connection between the first passage and the water storage box, a second switch is arranged at the connection between the second passage and the water storage box, and a third switch is arranged at the connection between the third passage and the water storage box; the control device of the photovoltaic air conditioning system comprises: a control unit configured to control the first switch to be in an open state, control the second switch to be in a closed state, and control the third switch to be in an open state, so that the excess condensed water stored in the water storage box is discharged to the outside of the room when the photovoltaic air conditioning system is turned off. The control unit is further configured to determine a heat dissipation mode of the photovoltaic air conditioning system as a current heat dissipation mode of the photovoltaic air conditioning system according to a current working mode of the photovoltaic inverter system and the air conditioning system in the main machine in the case that the photovoltaic air conditioning system is started and a refrigeration mode is started, wherein the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine includes any one of the following modes: a pure photovoltaic mode in which the photovoltaic inverter system in the main machine supplies power alone, a pure air conditioning mode in which the photovoltaic inverter system in the main machine does not supply power and only mains power supplies power, and a photovoltaic hybrid operation mode in which the photovoltaic inverter system in the main machine and the mains power supply power together; the current heat dissipation mode of the photovoltaic air conditioning system includes at least one of the following: a first water cooling heat dissipation mode in which the photovoltaic main board radiator (3) is water cooled and heat dissipated by using condensate water, an air cooling heat dissipation mode in which the photovoltaic main board radiator (3) and / or the main board radiator of the outdoor unit of the main machine is air cooled and heat dissipated by using the outdoor unit fan of the main machine, and a second water cooling heat dissipation mode in which the photovoltaic main board radiator (3) is water cooled and heat dissipated by using a water pump circulation system of the water storage box; the water pump circulation system of the water storage box is in communication with a water cooling coil inside the photovoltaic main board radiator (3); The acquisition unit is configured to acquire a current parameter of the photovoltaic air conditioning system in the current heat dissipation mode of the photovoltaic air conditioning system; the current parameter of the photovoltaic air conditioning system includes a current environmental parameter of the photovoltaic air conditioning system and a current operation parameter of the photovoltaic air conditioning system; The control unit is further configured to control the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameter of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic main board (4) and / or the main board of the outdoor unit of the main machine.

9. The control device of the photovoltaic air conditioning system as claimed in claim 8, wherein, Wherein, The water storage box slot (2) is arranged outside the shell of the outdoor unit of the main machine, and the water storage box is arranged in the water storage box slot (2); the water cooling pipeline inside the photovoltaic main board radiator (3) is a coil; the coil has a condensate water inlet (11) and a condensate water outlet (12); the condensate water inlet (11) is in communication with the outlet of the second passage, and the condensate water outlet (12) is in communication with the inlet of the third passage.

10. The control device of the photovoltaic air conditioning system according to claim 8 or 9, characterized in that, The control unit determines the heat dissipation mode of the photovoltaic air conditioning system as a current heat dissipation mode of the photovoltaic air conditioning system according to a current working mode of the photovoltaic inverter system and the air conditioning system in the main machine, including: If the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure photovoltaic mode, the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode in which the photovoltaic main board radiator (3) is air cooled and heat dissipated by using the outdoor unit fan of the main machine; If the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the pure air conditioning mode, the current heat dissipation mode of the photovoltaic air conditioning system is the air cooling heat dissipation mode in which the main board radiator of the outdoor unit of the main machine is air cooled and heat dissipated by using the outdoor unit fan of the main machine; If the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the photovoltaic hybrid operation mode, the current heat dissipation mode of the photovoltaic air conditioning system is: a first water-cooling heat dissipation mode in which the photovoltaic mainboard radiator (3) is water-cooled by condensate water, an air-cooling heat dissipation mode in which the photovoltaic mainboard radiator (3) and the outdoor mainboard radiator of the host are air-cooled by the outdoor fan of the host, and a second water-cooling heat dissipation mode in which the photovoltaic mainboard radiator (3) is water-cooled by a water pump circulation system of the preset water storage box.

11. The control device of the photovoltaic air conditioning system as claimed in claim 10, wherein, The control unit controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic mainboard (4) and / or the outdoor mainboard of the host, including: In the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure photovoltaic mode, the current parameters of the photovoltaic air conditioning system are determined as: the current temperature of the photovoltaic mainboard (4), the current outdoor environment temperature of the host; According to the current temperature of the photovoltaic mainboard (4) and the current outdoor environment temperature of the host, the target rotating speed of the outdoor fan of the host is determined according to a preset first formula, and the outdoor fan of the host is controlled to operate at the target rotating speed of the outdoor fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; The preset first formula is: R = R0 + K1 (T s -T _out )+K2 (T s -T _out ) 2 ; Wherein, R is the target rotating speed of the outdoor unit fan of the host, R0 is the rotating speed reference value of the outdoor unit fan of the host, K1 is a preset first control system, K2 is a preset second control coefficient, T s is the current temperature of the photovoltaic main board (4), T _out is the current outdoor environment temperature of the host.

12. The control device of the photovoltaic air conditioning system as claimed in claim 10, wherein, The control unit controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic mainboard (4) and / or the outdoor mainboard of the host, including: In the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the host is the pure photovoltaic mode, the current parameters of the photovoltaic air conditioning system are determined as: the current temperature of the photovoltaic mainboard (4), the current outdoor environment temperature of the host; According to the current temperature of the photovoltaic mainboard (4) and the current outdoor environment temperature of the host, the target rotating speed of the outdoor fan of the host is determined according to a preset first formula, and the outdoor fan of the host is controlled to operate at the target rotating speed of the outdoor fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; According to the current temperature of the photovoltaic main board (4), and in combination with the current running frequency of the compressor of the main machine, the current temperature of the photovoltaic main board (4), the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator (3), the current outdoor environment temperature of the main machine, the current indoor environment temperature of the main machine, and the current indoor environment temperature of all slave machines, the opening and closing of the first switch, the second switch and the third switch are controlled, and the opening degree of the second switch is controlled, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; The preset second formula is: R = R0+ K3 T _out / T0+ K4 (f _comp / f _max ) 2 ; Wherein, R is the target rotating speed of the outdoor fan of the host, R0 is the rotating speed reference value of the outdoor fan of the host, K3 is a preset third control system, K4 is a preset fourth control coefficient, T0 is the current temperature of the mainboard of the outdoor unit of the host, T _out is the current outdoor environment temperature of the host, f _comp is the current operating frequency of the compressor of the host, f _max is the preset maximum operating frequency of the compressor of the host.

13. The control device of the photovoltaic air conditioning system as claimed in claim 12, wherein, The control unit controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic main board (4) and / or the outdoor main board of the main machine, and further comprises: If the current temperature of the photovoltaic main board (4) is less than the first preset temperature of the photovoltaic main board (4), the first switch is controlled to be in an open state, the second switch is controlled to be in a closed state, and the third switch is controlled to be in an open state; if the current temperature of the photovoltaic main board (4) is greater than or equal to the first preset temperature of the photovoltaic main board (4), the second switch is controlled to be in an open state, the target opening degree of the second switch is determined according to the preset third formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; The preset third formula is: K _valve = a f _comp / f _max ) 2 RH b [(T _cond –T1) / (T _cond -T _out )]+c [(T_ in1 +T _in2 +…+T _inn ) / n] wherein K _valve is the target opening degree of the second switch, f _comp is the current operating frequency of the compressor of the host, f _max is the preset maximum operating frequency of the compressor of the host, RH is the current outdoor ambient humidity of the host, T _cond is the current temperature of the photovoltaic mainboard radiator (3), T1 is the first preset temperature of the photovoltaic mainboard (4), T _out is the current outdoor ambient temperature of the host, T in1 is the current indoor ambient temperature of the host, T _in2 is the current indoor ambient temperature of the first slave among all the slaves, T _inn is the current indoor ambient temperature of the n-1th slave among all the slaves, n is the total number of the host + all the slaves, a is a preset first correction coefficient, b is a preset second correction coefficient, and c is a preset third correction coefficient.

14. The control device of the photovoltaic air conditioning system as claimed in claim 10, wherein, The control unit controls the current heat dissipation mode of the photovoltaic air conditioning system according to the current parameters of the photovoltaic air conditioning system, so as to realize temperature control of the photovoltaic main board (4) and / or the outdoor main board of the main machine, and further comprises: In the case that the current working mode of the photovoltaic inverter system and the air conditioning system in the main machine is the photovoltaic hybrid operation mode, the current parameters of the photovoltaic air conditioning system are determined as: the current temperature of the photovoltaic main board (4), the current outdoor environment temperature of the main machine, the current running frequency of the compressor of the main machine, the current outdoor environment humidity of the main machine, the current temperature of the photovoltaic main board radiator (3), the current indoor environment temperature of the main machine, the current indoor environment temperature of all slave machines, and the photovoltaic power generation amount of the photovoltaic inverter system in the main machine. In the case that the photovoltaic power generation amount of the photovoltaic inverter system in the host is lower than the preset power threshold, the target rotating speed of the outdoor unit fan of the host is determined according to the current temperature of the photovoltaic main board (4), the current outdoor environment temperature of the host, the current operating frequency of the compressor of the host, the current outdoor environment humidity of the host, the current temperature of the photovoltaic main board radiator (3), the current indoor environment temperature of the host, and the current indoor environment temperature of all slave units, according to a preset fourth formula, and the outdoor unit fan of the host is controlled to operate at the target rotating speed of the outdoor unit fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; and the target opening degree of the second switch is determined according to a preset fifth formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system. In the case that the photovoltaic power generation amount of the photovoltaic inverter system in the host is not lower than the preset power threshold, the target rotating speed of the outdoor unit fan of the host is determined according to the current temperature of the photovoltaic main board (4), the current outdoor environment temperature of the host, the current operating frequency of the compressor of the host, the current outdoor environment humidity of the host, the current temperature of the photovoltaic main board radiator (3), the current indoor environment temperature of the host, and the current indoor environment temperature of all slave units, according to a preset sixth formula, and the outdoor unit fan of the host is controlled to operate at the target rotating speed of the outdoor unit fan of the host, so as to control the current heat dissipation mode of the photovoltaic air conditioning system; and the target opening degree of the second switch is determined according to a preset seventh formula, and the opening degree of the second switch is controlled to be the target opening degree of the second switch, so as to control the current heat dissipation mode of the photovoltaic air conditioning system. The preset fourth formula is: R = (A - A _min ) / (A1- A _min ) R _min + K3 T _out / T0+ K4 (f _comp / f _max ) 2 ; The preset fifth formula is: K _valve = (a f _comp / f _max )2 RH b [(T _cond –T1) / (T _cond -T _out )]+c [(T _in1 +T _in2 +…+T _inn ) / n]; The preset sixth formula is: R = R0 + K1 (T s -T _out )+K2 (T s -T _out ) 2 +K3 T _out / T0 + K4 (f _comp / f _max ) 2 ; The preset seventh formula is: K _valve = (A - A1) / (A _max - A1) K _max ; Wherein, R is the target rotating speed of the outdoor unit fan of the host, R0 is the rotating speed reference value of the outdoor unit fan of the host, K1 is the preset first control system, K2 is the preset second control coefficient, K3 is the preset third control system, K4 is the preset fourth control coefficient, T s is the current temperature of the photovoltaic main board (4), T _out is the current outdoor environment temperature of the host, f _comp is the current operating frequency of the compressor of the host, f _max is the preset maximum operating frequency of the compressor of the host, RH is the current outdoor environment humidity of the host, T _cond is the current temperature of the photovoltaic main board radiator (3), T1 is the first preset temperature of the photovoltaic main board (4), T in1 is the current indoor environment temperature of the host, T _in2 is the current indoor environment temperature of the first slave among all the slaves, T _inn is the current indoor environment temperature of the n-1th slave among all the slaves, n is the total number of the host + all the slaves, a is the preset first correction coefficient, b is the preset second correction coefficient, c is the preset third correction coefficient, K _valve is the target opening degree of the second switch, A is the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _min is the minimum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host, A _max is the maximum value of the photovoltaic power generation amount of the photovoltaic inverter system in the host; A1 is the preset power threshold; R _min is the minimum value of the rotating speed of the outdoor unit fan of the host, K _max is the maximum opening degree of the second switch.

15. A photovoltaic air conditioning system, characterized by, The photovoltaic air conditioning system comprises: The photovoltaic air conditioning system of any one of claims 8 to 14.

16. A storage medium, characterized by The storage medium comprises a stored program, wherein the device where the storage medium is located executes the control method of the photovoltaic air conditioning system of any one of claims 1 to 7 when the program is executed.

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