A control device, method and photovoltaic air conditioner of a hybrid power supply system

Abstract

The application discloses a control device of a hybrid power supply system, a photovoltaic air conditioner and a control method of a hybrid power supply system thereof, and the device comprises: a control unit, which controls a switch assembly when powered on, so that the power supply state of the hybrid power supply system is a state of only mains power supply; an acquisition unit, which acquires a photovoltaic voltage of a photovoltaic assembly, an energy storage voltage and a residual power of an energy storage assembly and a direct-current bus voltage of a bus capacitor unit in the case of running after being powered on; and the control unit controls the switch assembly, a voltage reduction unit, a first voltage increase unit, a second voltage increase unit and a third voltage increase unit in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage and the residual power of the energy storage assembly and the direct-current bus voltage of the bus capacitor unit, so as to adjust the power supply state of the hybrid power supply system. According to the scheme, the three-way voltage increase units of the mains, the photovoltaic assembly and the energy storage assembly are arranged in series and parallel to adjust different power supply states of the hybrid power supply system, and the circuit utilization rate and the power factor are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of photovoltaic air conditioners, and particularly relates to a control device of a hybrid power supply system, a photovoltaic air conditioner and a control method of a hybrid power supply system thereof, and more particularly to a control device of a three-way hybrid power supply circuit of a photovoltaic air conditioner, a photovoltaic air conditioner (such as a photovoltaic air conditioner for off-grid use) having the control device of the three-way hybrid power supply circuit, and a control method of the three-way hybrid power supply circuit of the photovoltaic air conditioner. BACKGROUND

[0002] With the increasingly prominent contradiction between energy shortage and increasing demand for energy in production and life, the development and application of new energy have gradually attracted the attention of countries around the world. Under the background of carbon neutrality, clean and environmentally friendly photovoltaic power generation and its application have become one of the relatively popular research fields in China, and the market prospect of the photovoltaic related field is relatively broad.

[0003] The photovoltaic power equipment (such as a photovoltaic air conditioner) generally adopts a hybrid power supply mode of commercial power and photovoltaic power, and is matched with an energy storage component (such as a storage battery) to form a power supply system. In the past matching, each power supply block is an independent circuit system, but when only one power supply block operates, the remaining power supply blocks are in an idle state, and the circuit utilization rate is not high.

[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 device of a hybrid power supply system, a photovoltaic air conditioner and a control method of a hybrid power supply system thereof, to solve the problem of low circuit utilization rate of a photovoltaic power equipment (such as a photovoltaic air conditioner) powered by commercial power, photovoltaic components and energy storage components (such as storage batteries) when only one power supply block operates and the remaining power supply blocks are in an idle state, to achieve the effect of adjusting different power supply conditions of the hybrid power supply system by series and parallel connection of three-way boost units of commercial power, photovoltaic components and storage batteries, and improving the circuit utilization rate and power factor of the hybrid power supply system.

[0006] The application provides a control device of a hybrid power supply system, external input sources of the hybrid power supply system, including a photovoltaic assembly, an energy storage assembly and a commercial power supply; the hybrid power supply system includes a switch assembly, a step-down unit, a first step-up unit, a second step-up unit, a third step-up unit, a rectifier unit, a bus capacitor unit and an inverter unit; an output end of the energy storage assembly is connected to the bus capacitor unit through the step-down unit and the third step-up unit; an output end of the photovoltaic assembly is connected to the bus capacitor unit through the second step-up unit and is also connected to an input end of the third step-up unit; an output end of the commercial power supply is connected to a power supply end of a load in a photovoltaic power consumption device through the rectifier unit, the first step-up unit, the bus capacitor unit and the inverter unit; the switch assembly is connected to the step-down unit, the first step-up unit, the second step-up unit, the third step-up unit, the rectifier unit and the bus capacitor unit respectively; the control device of the hybrid power supply system includes an acquisition unit and a control unit; wherein the control unit is used for controlling the switch assembly to make the power supply state of the hybrid power supply system be a state of only the commercial power supply in the case of power-on of the photovoltaic power consumption device; the acquisition unit is used for acquiring a photovoltaic voltage of the photovoltaic assembly, an energy storage voltage of the energy storage assembly, a residual power of the energy storage assembly and a direct current bus voltage of the bus capacitor unit in the case of running after starting of the photovoltaic power consumption device; the control unit is also used for controlling the switch assembly, the step-down unit, the first step-up unit, the second step-up unit and the third step-up unit in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly and the direct current bus voltage of the bus capacitor unit to realize adjustment of the power supply state of the hybrid power supply system.

[0007] In some embodiments, the switch assembly comprises: a first switch; and at least one of a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch; wherein the first switch is arranged between an output end of the commercial power and an input end of the rectifier unit; the second switch is arranged between an output end of the photovoltaic assembly and an input end of the second voltage-boosting unit; the third switch is arranged between an output end of the second voltage-boosting unit and an input end of the first voltage-boosting unit; the fourth switch is arranged between an output end of the energy storage assembly and an input end of the voltage-lowering unit; the fifth switch is arranged between an output end of the second voltage-boosting unit and a positive electrode of the bus capacitor unit; the sixth switch is arranged between an input end of the third voltage-boosting unit and an input end of the second voltage-boosting unit; the seventh switch is arranged between an input end of the second voltage-boosting unit and an input end of the first voltage-boosting unit; and the control unit controls the switch assembly, the voltage-lowering unit, the first voltage-boosting unit, the second voltage-boosting unit, and the third voltage-boosting unit in combination with a photovoltaic voltage of the photovoltaic assembly, an energy storage voltage of the energy storage assembly, a remaining amount of electricity of the energy storage assembly, and a direct-current bus voltage of the bus capacitor unit to adjust a power supply state of the hybrid power supply system, including controlling opening and closing of corresponding switches in the switch assembly in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the remaining amount of electricity of the energy storage assembly, and the direct-current bus voltage of the bus capacitor unit, and controlling the voltage-lowering unit, the first voltage-boosting unit, the second voltage-boosting unit, and the third voltage-boosting unit to jointly supply power by the first voltage-boosting unit, the second voltage-boosting unit, and the third voltage-boosting unit to adjust the power supply state of the hybrid power supply system.

[0008] In combination with the above device, the present application further provides a photovoltaic air conditioner comprising the control device of the hybrid power supply system.

[0009] In combination with the photovoltaic air conditioner, the application further provides a control method of a hybrid power supply system of the photovoltaic air conditioner, comprising: in the case that the photovoltaic air conditioner is powered on, controlling the switch assembly to make the power supply state of the hybrid power supply system be a state of only the mains power supply; in the case that the photovoltaic air conditioner is started and runs, acquiring the photovoltaic voltage of the photovoltaic assembly; acquiring the energy storage voltage of the energy storage assembly; acquiring the residual power of the energy storage assembly; and acquiring the DC bus voltage of the bus capacitor unit; in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, controlling the switch assembly, the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit to realize the adjustment of the power supply state of the hybrid power supply system.

[0010] In some embodiments, wherein the control of the switch assembly to make the power supply state of the hybrid power supply system be a state of only the mains power supply comprises: controlling the first switch to be closed, controlling the rest of the switches in the switch assembly to be opened, and controlling the pulse width modulation (PWM) wave of the switch tube in the first voltage increase unit to make the voltage of the mains after rectification rise to the DC bus voltage of the bus capacitor unit after one-stage voltage increase, so as to control the power supply state of the hybrid power supply system to be a preset first state of only the mains power supply; and / or, in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, the control of the switch assembly, the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit to realize the adjustment of the power supply state of the hybrid power supply system comprises: in the case that the switch assembly comprises the first switch, and the switch assembly further comprises at least one of the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch, in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, the control of the opening and closing of the corresponding switches in the switch assembly, and in combination with the control of the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit, so that the first voltage increase unit, the second voltage increase unit and the third voltage increase unit jointly supply power to realize the adjustment of the power supply state of the hybrid power supply system.

[0011] In some embodiments, the power supply state of the hybrid power supply system includes a preset first state; the power supply state of the hybrid power supply system also includes at least one of a preset second state, a preset third state, a preset fourth state, a preset fifth state, a preset sixth state, and a preset seventh state; wherein the preset first state is a state of power supply by the utility power only; the preset second state is a state of power supply by the photovoltaic assembly only; the preset third state is a state of charging the energy storage assembly in the state of power supply by the photovoltaic assembly only; the preset fourth state is a state of power supply by the photovoltaic voltage of the photovoltaic assembly after two-stage voltage boosting by the first voltage boosting unit and the second voltage boosting unit; the preset fifth state is a state of hybrid power supply by the photovoltaic assembly and the utility power; the preset sixth state is a state of power supply by the energy storage assembly only; and the preset seventh state is a state of hybrid power supply by the energy storage assembly and the utility power.

[0012] In some embodiments, the voltage reduction unit comprises a buck circuit; each of the first voltage increase unit and the second voltage increase unit comprises a power factor correction (PFC) boost circuit; in the case that the power supply state of the hybrid power supply system comprises a preset first state, a preset second state and a preset third state, the opening and closing of the corresponding switches in the switch assembly are controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual capacity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, and the first voltage increase unit, the second voltage increase unit and the third voltage increase unit are controlled in combination to jointly supply power by the first voltage increase unit, the second voltage increase unit and the third voltage increase unit, so as to adjust the power supply state of the hybrid power supply system, comprising: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the first set voltage threshold, determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a second set voltage threshold; the second set voltage threshold is greater than the first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the second set voltage threshold, controlling the second switch and the fifth switch to be closed, controlling the remaining switches in the switch assembly other than the second switch and the fifth switch to be opened, and controlling the PWM wave of the switch tube in the second voltage increase unit to increase the photovoltaic voltage of the photovoltaic assembly to the DC bus voltage of the bus capacitor unit, so as to adjust the power supply state of the hybrid power supply system to the state of only the photovoltaic assembly supplying power, i.e. the preset second state; after adjusting the power supply state of the hybrid power supply system to the preset second state, determining whether the energy storage assembly needs to be charged according to the energy storage voltage of the energy storage assembly; if it is determined that the energy storage assembly needs to be charged, controlling the fourth switch and the sixth switch to be closed in the state of only the photovoltaic assembly supplying power, controlling the remaining switches in the switch assembly other than the second switch, the fourth switch, the fifth switch and the sixth switch to be opened, and controlling the switch tube in the voltage reduction unit to charge the energy storage assembly, so as to adjust the power supply state of the hybrid power supply system to the state of charging the energy storage assembly in the state of only the photovoltaic assembly supplying power, i.e. the preset third state.

[0013] In some embodiments, each of the first and second voltage boosting units comprises a PFC Boost voltage boosting circuit; in the case that the power supply state of the hybrid power supply system comprises a preset first state, a preset fourth state and a preset fifth state, in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the remaining power of the energy storage assembly and the DC bus voltage of the bus capacitor unit, the opening and closing of the corresponding switches in the switch assembly are controlled, and in combination with the control of the voltage reducing unit, the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit, the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit are jointly powered to realize the adjustment of the power supply state of the hybrid power supply system, further comprising: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the first set voltage threshold, determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a second set voltage threshold; the second set voltage threshold is greater than the first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the second set voltage threshold, determining whether the photovoltaic voltage of the photovoltaic assembly can reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting; if it is determined that the photovoltaic voltage of the photovoltaic assembly can reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, the second switch and the third switch are controlled to be closed, the remaining switches in the switch assembly except the second switch and the third switch are controlled to be opened, and the PWM wave of the switch tube in the first voltage boosting unit and the PWM wave of the switch tube in the second voltage boosting unit are controlled to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, so as to adjust the power supply state of the hybrid power supply system to a state in which only the photovoltaic voltage of the photovoltaic assembly is powered after two-stage voltage boosting by the first voltage boosting unit and the second voltage boosting unit, i.e. the preset fourth state; if it is determined that the photovoltaic voltage of the photovoltaic assembly cannot reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, the second switch and the fifth switch are controlled to be closed, the remaining switches in the switch assembly except the first switch, the second switch and the fifth switch are controlled to be opened, and the PWM wave of the switch tube in the first voltage boosting unit is controlled to make the voltage of the mains after rectification rise to the DC bus voltage of the bus capacitor unit, and the PWM wave of the switch tube in the second voltage boosting unit is controlled to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit after one-stage voltage boosting, so as to make the photovoltaic assembly and the mains supply power in combination, so as to adjust the power supply state of the hybrid power supply system to a state in which the photovoltaic assembly and the mains supply power in combination, i.e. the preset fifth state.

[0014] In some embodiments, each of the first and third boost units comprises a PFC Boost boost circuit; in the case that the power supply state of the hybrid power supply system comprises a preset first state and a preset sixth state, the opening and closing of the corresponding switches in the switch assembly are controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual capacity of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, and the control of the voltage reduction unit, the first boost unit, the second boost unit, and the third boost unit is combined to jointly supply power by the first boost unit, the second boost unit, and the third boost unit, so as to realize the adjustment of the power supply state of the hybrid power supply system, and further comprising: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the first set voltage threshold, determining whether the energy storage voltage of the energy storage assembly is greater than a third set voltage threshold; if it is determined that the energy storage voltage of the energy storage assembly is greater than the third set voltage threshold, controlling the fourth switch, the fifth switch, the sixth switch, and the seventh switch to be closed, controlling the remaining switches in the switch assembly other than the fourth switch, the fifth switch, the sixth switch, and the seventh switch to be opened, and controlling the PWM wave of the switch tube in the third boost unit to make the energy storage voltage of the energy storage assembly rise to the DC bus voltage of the bus capacitor unit after one-stage boosting, so as to adjust the power supply state of the hybrid power supply system to the state of being powered only by the energy storage assembly, i.e., the preset sixth state.

[0015] In some embodiments, each of the first boost unit and the third boost unit comprises a PFC Boost boost circuit; in the case that the power supply state of the hybrid power supply system comprises a preset first state and a preset seventh state, the opening and closing of the corresponding switch in the switch assembly is controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual amount of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, and the first boost unit, the second boost unit, and the third boost unit are controlled in combination to jointly supply power, so as to realize the adjustment of the power supply state of the hybrid power supply system, and further comprising: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the first set voltage threshold, determining whether the energy storage voltage of the energy storage assembly is greater than a third set voltage threshold; if it is determined that the energy storage voltage of the energy storage assembly is less than or equal to the third set voltage threshold, determining whether the residual amount of the energy storage assembly meets a preset minimum starting amount; wherein the preset minimum starting amount is the minimum amount of electricity for starting the photovoltaic air conditioner; if it is determined that the residual amount of the energy storage assembly meets the preset minimum starting amount, the fourth switch, the fifth switch, and the sixth switch are all closed, and the remaining switches in the switch assembly except the first switch, the fourth switch, the fifth switch, and the sixth switch are all opened, and the PWM wave of the switch tube in the first boost unit is controlled to make the voltage after rectification of the commercial power be boosted to the DC bus voltage of the bus capacitor unit through one-stage boosting, and the PWM wave of the switch tube in the third boost unit is controlled to make the energy storage voltage of the energy storage assembly be boosted to the DC bus voltage of the bus capacitor unit through one-stage boosting, so that the photovoltaic assembly and the commercial power are hybrid supplied, so as to adjust the power supply state of the hybrid power supply system to the state that the energy storage assembly and the commercial power are hybrid supplied, i.e. the preset seventh state; if it is determined that the residual amount of the energy storage assembly does not meet the preset minimum starting amount, the first switch is maintained to be closed, the remaining switches in the switch assembly except the first switch are maintained to be opened, and the PWM wave of the switch tube in the first boost unit is maintained to make the voltage after rectification of the commercial power be boosted to the DC bus voltage of the bus capacitor unit through one-stage boosting, so as to maintain the power supply state of the hybrid power supply system to the state that only the commercial power supplies power, i.e. the preset first state.

[0016] Thus, the scheme of the present application, through the mixed power supply system for the photovoltaic electrical equipment (such as the photovoltaic air conditioner) of the three-way mixed power supply of the commercial power, the photovoltaic assembly and the energy storage assembly (such as the storage battery), the mixed power supply system is provided with the switch assembly (such as the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch), specifically: the first switch is arranged at the front end of the rectifier circuit of the commercial power, the second switch is arranged between the output end of the photovoltaic assembly and the input end of the PFC circuit (such as the PFC Boost voltage boosting circuit) of the photovoltaic assembly, the third switch is arranged between the output end of the PFC circuit of the photovoltaic assembly and the input end of the PFC circuit of the commercial power, the fourth switch is arranged between the output end of the energy storage assembly and the input end of the Buck circuit of the energy storage assembly, the fifth switch is arranged between the output end of the PFC circuit of the photovoltaic assembly and the power input end (such as the output end of the direct current bus voltage of the commercial power) of the load, the sixth switch is arranged between the output end of the Buck circuit of the energy storage assembly and the input end of the PFC circuit of the energy storage assembly and the input end of the PFC circuit of the photovoltaic assembly, and the seventh switch is arranged between the input end of the PFC circuit of the photovoltaic assembly and the input end of the PFC circuit of the commercial power; in the case that the photovoltaic electrical equipment is started and stably operated, the photovoltaic input voltage of the photovoltaic assembly, the voltage of the storage battery and the residual capacity of the storage battery are combined, the corresponding switches in the switch assembly are controlled to be opened and closed, the PFC circuit of the commercial power, the PFC circuit of the photovoltaic assembly and the PFC circuit of the storage battery are arranged in series and in parallel to adjust different power supply conditions of the mixed power supply system; thus, the PFC circuit of the commercial power, the PFC circuit of the photovoltaic assembly and the PFC circuit of the storage battery are arranged in series and in parallel to adjust different power supply conditions of the mixed power supply system, thereby integrating the driving parts of the three-way PFC circuits of the commercial power, the photovoltaic assembly and the storage battery, and the circuit utilization rate and the power factor of the mixed power supply system can be improved.

[0017] 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.

[0018] The technical scheme of the present application will be further described in detail below with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structural schematic diagram of an embodiment of the control device of the mixed power supply system of the present application;

[0020] Figure 2 The topological schematic diagram of the three-way mixed power supply circuit of the off-grid photovoltaic air conditioner;

[0021] Figure 3 The flow schematic diagram of an embodiment of the mixed power supply strategy of the three-way mixed power supply circuit of the off-grid photovoltaic air conditioner;

[0022] Figure 4 Flowchart of another embodiment of a hybrid power supply strategy for a three-way hybrid power supply circuit of an off-grid photovoltaic air conditioner;

[0023] Figure 5 Flowchart of an embodiment of a control method for a hybrid power supply system of the photovoltaic air conditioner of the present application;

[0024] Figure 6 Flowchart of an embodiment of a first control process for adjusting the power supply state of the hybrid power supply system in the method of the present application;

[0025] Figure 7 Flowchart of an embodiment of a second control process for adjusting the power supply state of the hybrid power supply system in the method of the present application;

[0026] Figure 8 Flowchart of an embodiment of a third control process for adjusting the power supply state of the hybrid power supply system in the method of the present application;

[0027] Figure 9 Flowchart of an embodiment of a fourth control process for adjusting the power supply state of the hybrid power supply system in the method of the present application. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and 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 other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] For a photovoltaic electrical equipment (such as a photovoltaic air conditioner) powered by three-way hybrid power supply of a commercial power supply, a photovoltaic module and an energy storage component (such as a battery), in the case where only one of the power supply blocks of the photovoltaic module, the energy storage component (such as a battery) and the commercial power supply operates to supply power, the remaining power supply blocks are in an idle state, and there is a problem of low circuit utilization. The present application provides a control device for a hybrid power supply system, specifically a three-way hybrid power supply control circuit and control strategy for an off-grid photovoltaic air conditioner. The driving part of the PFC Boost voltage boosting circuit of each independent power supply circuit block is integrated, and on the basis of the original circuit, through the control action of the switching component, the driving part of the three-way PFC Boost voltage boosting circuit is connected in series and parallel according to different power supply conditions, the circuit stability is improved, and the power factor is improved.

[0030] According to an embodiment of the present application, a control device of a hybrid power supply system is provided. Referring to Figure 1 As shown in the structural schematic diagram of an embodiment of the device of the present application, the external input source of the hybrid power supply system includes a photovoltaic assembly, an energy storage assembly and a commercial power supply; the hybrid power supply system includes a switching assembly, a step-down unit, a first step-up unit, a second step-up unit, a third step-up unit, a rectification unit, a bus capacitor unit and an inverter unit, the switching assembly being, for example, switches K1, K2, K3, K4, K5, K6 and K7, the step-down unit being, for example, a Buck circuit of the energy storage assembly, the first step-up unit being, for example, a PFC circuit of the commercial power supply, the second step-up unit being, for example, a PFC circuit of the photovoltaic assembly, the third step-up unit being, for example, a PFC circuit of the energy storage assembly, the rectification unit being, for example, a rectification bridge, the bus capacitor unit being, for example, a DC bus capacitor C, and the inverter unit being, for example, an inverter; the output end of the energy storage assembly is connected to the bus capacitor unit (specifically, to the positive pole of the bus capacitor unit) via the step-down unit and the third step-up unit; the output end of the photovoltaic assembly is connected to the bus capacitor unit (specifically, to the positive pole of the bus capacitor unit) via the second step-up unit and is also connected to the input end of the third step-up unit; the output end of the commercial power supply is connected to the power supply end of a load in a photovoltaic electrical device via the rectification unit, the first step-up unit, the bus capacitor unit and the inverter unit; the switching assembly is connected to the step-down unit, the first step-up unit, the second step-up unit, the third step-up unit, the rectification unit and the bus capacitor unit, respectively; and the switching assembly includes two or more switches.

[0031] In the scheme of the present application, as Figure 1 As shown, the control device of the hybrid power supply system includes an acquisition unit and a control unit.

[0032] The control unit is configured to, in the case that the photovoltaic electrical device is powered on, control the switching assembly to make the power supply state of the hybrid power supply system be a state in which only the commercial power supply supplies power, i.e., a preset first state.

[0033] The acquisition unit is configured to, in the case that the power supply state of the hybrid power supply system is only the state of the mains power supply, i.e., a preset first state, acquire voltage detection data of an output end of the photovoltaic module, denoted as a photovoltaic voltage of the photovoltaic module (e.g., a photovoltaic input voltage Vdc of the photovoltaic module), in the case that the photovoltaic electrical equipment is running after being started (specifically, in the case that the photovoltaic electrical equipment, such as a photovoltaic air conditioner, is running to a stable state after being started); acquire voltage detection data of an output end of the energy storage component, denoted as an energy storage voltage of the energy storage component (e.g., an energy storage partial voltage Vbat of the energy storage component); acquire the residual capacity of the energy storage component (e.g., the current residual capacity of a battery); and acquire a direct-current bus voltage at a direct-current bus connected with the bus capacitor unit, denoted as a direct-current bus voltage of the bus capacitor unit (e.g., a direct-current bus voltage Vmx).

[0034] The control unit is further configured to, in the case that the power supply state of the hybrid power supply system is only the state of the mains power supply, i.e., a preset first state, control the switching component (specifically, control the opening and closing of corresponding switches in two or more switches in the switching component) to adjust the connection relationship of the first boost unit, the second boost unit, and the series-parallel connection of the boost units in the hybrid power supply system, so that the first boost unit, the second boost unit, and the third boost unit jointly supply power, and the power supply state of the hybrid power supply system is adjusted, wherein the power supply state of the hybrid power supply system includes two or more states.

[0035] The three-way hybrid power supply control circuit of the off-grid photovoltaic air conditioner provided in the scheme of the present application, by combining the photovoltaic voltage of the photovoltaic module, the energy storage voltage of the energy storage component, the residual capacity of the energy storage component, and the direct-current bus voltage of the bus capacitor unit, and controlling the switching component in the case that the photovoltaic electrical equipment is running after being started, the PFC Boost boost circuit of different power supply boards is jointly used, and the PFC Boost boost circuit is used in series and parallel through the control of the switching component; in this way, the driving part of the PFC Boost boost circuit of each independent power supply circuit board is integrated, and the driving part of the three-way PFC Boost boost circuit is used in series and parallel according to different power supply conditions through the control of the switching component on the basis of the original circuit, the circuit stability is improved, and the power factor is improved.

[0036] In some embodiments, the switch component includes: a first switch; the switch component also includes at least one of the following: a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch; wherein the first switch is arranged between the output end of the AC power and the input end of the rectifier unit; the second switch is arranged between the output end of the photovoltaic component and the input end of the second boost unit; the third switch is arranged between the output end of the second boost unit and the input end of the first boost unit; the fourth switch is arranged between the output end of the energy storage component and the input end of the step-down unit; the fifth switch is arranged between the output end of the second boost unit and the positive pole of the bus capacitor unit; the sixth switch is arranged between the input end of the third boost unit and the input end of the second boost unit; the seventh switch is arranged between the input end of the second boost unit and the input end of the first boost unit.

[0037] The control unit, in combination with the photovoltaic voltage of the photovoltaic component, the energy storage voltage of the energy storage component, the remaining power of the energy storage component, and the DC bus voltage of the bus capacitor unit, controls the switch component, the step-down unit, the first boost unit, the second boost unit and the third boost unit to adjust the power supply state of the hybrid power supply system, including: the control unit is specifically further configured to control the opening and closing of the corresponding switches in the switch component in combination with the photovoltaic voltage of the photovoltaic component, the energy storage voltage of the energy storage component, the remaining power of the energy storage component, and the DC bus voltage of the bus capacitor unit, and in combination with controlling the step-down unit, the first boost unit, the second boost unit and the third boost unit to adjust the series-parallel connection relationship of the first boost unit, the second boost unit and the boost unit in the hybrid power supply system, so that the first boost unit, the second boost unit and the third boost unit jointly supply power to adjust the power supply state of the hybrid power supply system.

[0038] The solution of the present invention is applicable to the circuit topology and hybrid power supply strategy of off-grid photovoltaic air conditioners that are powered by a combination of mains electricity, photovoltaic modules and energy storage modules (such as batteries). Figure 2 This is a topological diagram of a three-way hybrid power supply circuit for off-grid photovoltaic air conditioners. Figure 2 The circuit topology diagram of the three-way PFC Boost boost circuit in series and parallel connection of the three-way hybrid power supply circuit of the off-grid photovoltaic air conditioner is described. Figure 2As shown, a first switch (such as switch K1) is provided at the front end of the mains rectifier circuit, a second switch (such as switch K2) is provided between the output end of the photovoltaic assembly and the input end of the PFC circuit (such as the PFC Boost circuit) of the photovoltaic assembly, a third switch (such as switch K3) is provided between the output end of the PFC circuit of the photovoltaic assembly and the input end of the mains PFC circuit, a fourth switch (such as switch K4) is provided between the output end of the energy storage assembly and the input end of the Buck circuit of the energy storage assembly, a fifth switch (such as switch K5) is provided between the output end of the PFC circuit of the photovoltaic assembly and the power input end of the load (such as the output end of the DC bus voltage of the mains), a sixth switch (such as switch K6) is provided between the output end of the Buck circuit of the energy storage assembly and the input end of the PFC circuit of the energy storage assembly and the input end of the PFC circuit of the photovoltaic assembly, and a seventh switch (such as switch K7) is provided between the input end of the PFC circuit of the photovoltaic assembly and the input end of the PFC circuit of the mains.

[0039] exist Figure 2 In the example shown, the Buck circuit of the energy storage component includes: an inductor L0, a switch Q0, and a diode D1. The switch Q0 can be a transistor with a freewheeling diode, where the anode of the freewheeling diode is connected to the emitter of the transistor, and the cathode of the freewheeling diode is connected to the collector of the transistor. The PFC circuit of the energy storage component includes: an inductor L3, a switch Q3, and a diode D3. The switch Q3 can be a transistor, and the base of the switch Q3 serves as a control terminal for inputting a control signal PWM3. Voltage detection is performed at the output of the energy storage component to obtain the energy storage voltage Vbat. The first connection terminal of the output of the energy storage component is connected to the emitter of the switch Q0 and the cathode of the diode D0, respectively, after passing through the switch K4 and the inductor L0. The base of the switch Q0 serves as a control terminal for inputting a control signal. The collector of the switch Q0 is connected to the collector of the switch Q3 and the anode of the diode D3, respectively, after passing through the inductor L3. The second connection terminal of the energy storage component's output is connected to the anode of diode D0 and the emitter of switch Q3, respectively. The end of inductor L0 connected to switch K4 serves as the input of the energy storage component's Buck circuit. The collector of switch Q0 serves as the output of the Buck circuit. The collector of switch Q0, via switch K6, is connected to the input of the photovoltaic module's PFC circuit. The end of inductor L3 connected to the collector of switch Q0 serves as the input of the energy storage component's PFC circuit. The cathode of diode D3 serves as the output of the PFC circuit. The cathode of diode D3 is connected to the load's power supply (e.g., the output of the AC mains DC bus voltage Vmx, i.e., the positive terminal of DC bus capacitor C).

[0040] exist Figure 2In the shown example, the PFC circuit of the photovoltaic assembly comprises: an inductor L2, a switch Q2 and a diode D2; the switch Q2 can be a triode, the base of the switch Q2 is the control terminal and is used for inputting a control signal PWM2. The photovoltaic input voltage Vdc of the photovoltaic assembly is obtained by voltage detection from the output terminal of the photovoltaic assembly. The first connection terminal of the output terminal of the photovoltaic assembly is connected to the collector of the switch Q2 and the anode of the diode D2 respectively through the switch K2 and the inductor L2. The second connection terminal of the output terminal of the photovoltaic assembly is connected to the emitter of the switch Q2 and grounded. The end of the inductor L2 connected to the switch K2 is the input terminal of the PFC circuit of the photovoltaic assembly; the input terminal of the PFC circuit of the photovoltaic assembly is connected to the input terminal of the PFC circuit of the commercial power supply through the switch K7. The cathode of the diode D2 is the output terminal of the PFC circuit of the photovoltaic assembly; the cathode of the diode D2 is connected to the input terminal of the PFC circuit of the commercial power supply through the switch K3; the cathode of the diode D2 is connected to the power supply terminal of the load (such as the output terminal of the DC bus voltage Vmx of the commercial power supply, i.e. the positive electrode of the DC bus capacitor C) through the switch K5.

[0041] In Figure 2 In the shown example, the PFC circuit of the commercial power supply comprises: an inductor L1, a switch Q1 and a diode D1; the switch Q1 can be a triode, the base of the switch Q1 is the control terminal and is used for inputting a control signal PWM1. The DC bus voltage Vmx of the commercial power supply is obtained by voltage detection from the output terminal of the DC bus voltage Vmx, i.e. the positive electrode of the DC bus capacitor C. The first connection terminal of the output terminal of the commercial power supply is connected to the first connection terminal of the input terminal of the rectifier bridge through the switch K1; the second connection terminal of the output terminal of the commercial power supply is connected to the second connection terminal of the output terminal of the rectifier bridge. The first connection terminal (such as the positive electrode) of the output terminal of the rectifier bridge is connected to the collector of the switch Q1 and the anode of the diode D1 respectively through the inductor L1. The second connection terminal (such as the negative electrode) of the output terminal of the rectifier bridge is connected to the emitter of the switch Q1 and grounded. The cathode of the diode D1 is connected to the positive electrode of the DC bus capacitor C and connected to the first connection terminal of the input terminal of the inverter; the negative electrode of the DC bus capacitor C is grounded and connected to the second connection terminal of the input terminal of the inverter; the output terminal of the inverter is connected to the load (such as the three-phase winding of the motor). The end of the inductor L1 connected to the first connection terminal (such as the positive electrode) of the output terminal of the rectifier bridge is the input terminal of the PFC circuit of the commercial power supply. The cathode of the diode D1 is the output terminal of the PFC circuit of the commercial power supply.

[0042] In the scheme of the present application, by combining the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the remaining power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit in the case of running after the photovoltaic electrical equipment is started, the opening and closing of the corresponding switches in the switch assembly are controlled, so that the three-way PFC Boost voltage boosting circuit can achieve higher circuit utilization rate through the control action of the switch assembly, and the stability of the circuit is also improved. And in the case of circuit selection, through the control of the switch assembly, the problem of low circuit power factor is solved. Among them, the improvement of the circuit power factor refers to the staggered PFC structure of the energy storage assembly (such as a battery) power supply in the scheme of the present application, which is conducive to the improvement of the power factor and reduces the power consumption.

[0043] The technical scheme of the present application is adopted, and the mixed power supply system of the photovoltaic electrical equipment (such as a photovoltaic air conditioner) supplied by three ways of mains, photovoltaic assembly and energy storage assembly (such as a battery) is provided with a switch assembly (such as a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch), specifically: the first switch is arranged at the front end of the rectifier circuit of the mains, the second switch is arranged between the output end of the photovoltaic assembly and the input end of the PFC circuit (such as a PFC Boost voltage boosting circuit) of the photovoltaic assembly, the third switch is arranged between the output end of the PFC circuit of the photovoltaic assembly and the input end of the PFC circuit of the mains, the fourth switch is arranged between the output end of the energy storage assembly and the input end of the Buck circuit of the energy storage assembly, the fifth switch is arranged between the output end of the PFC circuit of the photovoltaic assembly and the power input end (such as the output end of the DC bus voltage of the mains) of the load, the sixth switch is arranged between the output end of the Buck circuit of the energy storage assembly and the input end of the PFC circuit of the energy storage assembly and the input end of the PFC circuit of the photovoltaic assembly, and the seventh switch is arranged between the input end of the PFC circuit of the photovoltaic assembly and the input end of the PFC circuit of the mains; in the case of stable operation after the photovoltaic electrical equipment is started, the photovoltaic input voltage of the photovoltaic assembly, the voltage of the battery and the remaining power of the battery are combined to control the opening and closing of the corresponding switches in the switch assembly, so that the PFC circuit of the mains, the PFC circuit of the photovoltaic assembly and the PFC circuit of the battery are arranged in series and in parallel to adjust different power supply conditions of the mixed power supply system; thereby, by arranging the PFC circuit of the mains, the PFC circuit of the photovoltaic assembly and the PFC circuit of the battery in series and in parallel to adjust different power supply conditions of the mixed power supply system, the driving part of the three-way PFC circuit of the mains, the photovoltaic assembly and the battery is integrated, which can improve the circuit utilization rate and the power factor of the mixed power supply system.

[0044] According to an embodiment of the present application, a photovoltaic air conditioner corresponding to the control device of the hybrid power supply system is also provided. The photovoltaic air conditioner can include the control device of the hybrid power supply system described above.

[0045] Since the process and functions realized by the photovoltaic air conditioner of the present embodiment are basically corresponding to the embodiments, principles and examples of the device, the description of the present embodiment will not be elaborated on the related descriptions in the foregoing embodiments, which will not be repeated here.

[0046] According to an embodiment of the present application, a control method of a hybrid power supply system of a photovoltaic air conditioner corresponding to the photovoltaic air conditioner is also provided, as shown in the flowchart of an embodiment of the method of the present application. The control method of the hybrid power supply system of the photovoltaic air conditioner can include steps S110 to S130. Figure 5

[0047] At step S110, in the case of powering on the photovoltaic air conditioner, the switching assembly is controlled to make the power supply state of the hybrid power supply system be the state of only the mains power supply, i.e. the preset first state.

[0048] In some embodiments, the step S110 of controlling the switching assembly to make the power supply state of the hybrid power supply system be the state of only the mains power supply includes: in the case of powering on the photovoltaic air conditioner, in the case that the switching assembly includes a first switch, controlling the first switch to be closed, controlling the rest of the switches in the switching assembly except the first switch to be open (such as the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all open), and controlling the PWM wave of the switching tube in the first boost unit to make the voltage of the mains power supply after rectification rise to the DC bus voltage of the bus capacitor unit after one-stage boost, so as to control the power supply state of the hybrid power supply system to be the state of only the mains power supply, i.e. the preset first state.

[0049] According to the scheme of the present application, in the case of powering on the photovoltaic air conditioner, the power supply state of the hybrid power supply system is controlled to be the state of only the mains power supply, i.e. the preset first state. In the preset first state, only the mains power supply, the first switch is closed, the rest of the switches in the switching assembly except the first switch are open (such as the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all open), and the PWM wave of the switching tube in the first boost unit is controlled to make the voltage of the mains power supply after rectification rise to the DC bus voltage of the bus capacitor unit after one-stage boost, so as to ensure that the photovoltaic air conditioner can be reliably started and operated.

[0050] ​At step S120, in the case that the power supply state of the hybrid power supply system is the state of only the mains power supply, i.e., the preset first state, in the case that the photovoltaic air conditioner is running after starting, (specifically, in the case that the photovoltaic air conditioner is running to a stable state after starting), the voltage detection data of the output end of the photovoltaic module is obtained, which is recorded as the photovoltaic voltage of the photovoltaic module (such as the photovoltaic input voltage Vdc of the photovoltaic module); the voltage detection data of the output end of the energy storage module is obtained, which is recorded as the energy storage voltage of the energy storage module (such as the energy storage part voltage Vbat of the energy storage module); the residual capacity of the energy storage module (such as the current residual capacity of the battery) is obtained; and the DC bus voltage at the DC bus connected with the bus capacitor unit is obtained, which is recorded as the DC bus voltage of the bus capacitor unit (such as the DC bus voltage Vmx).

[0051] At step S130, in the case that the power supply state of the hybrid power supply system is the state of only the mains power supply, i.e., the preset first state, in the case that the photovoltaic air conditioner is running after starting, the photovoltaic voltage of the photovoltaic module, the energy storage voltage of the energy storage module, the residual capacity of the energy storage module, and the DC bus voltage of the bus capacitor unit are combined to control the switch assembly, the voltage reduction unit, the first voltage increase unit, the second voltage increase unit, and the third voltage increase unit, so as to realize the adjustment of the power supply state of the hybrid power supply system, specifically, to control the switch assembly (specifically, to control the opening and closing of the corresponding switch among two or more switches in the switch assembly), the voltage reduction unit, the first voltage increase unit, the second voltage increase unit, and the voltage increase unit, so as to adjust the series-parallel connection relationship of the first voltage increase unit, the second voltage increase unit, and the voltage increase unit in the hybrid power supply system, so that the first voltage increase unit, the second voltage increase unit, and the third voltage increase unit jointly supply power, and realize the adjustment of the power supply state of the hybrid power supply system; the power supply state of the hybrid power supply system includes two or more states.

[0052] The scheme of the application provides a three-way hybrid power supply control circuit of a photovoltaic air conditioner for off-grid and a control strategy thereof. In the case that the photovoltaic air conditioner is running after starting, the photovoltaic voltage of the photovoltaic module, the energy storage voltage of the energy storage module, the residual capacity of the energy storage module, and the DC bus voltage of the bus capacitor unit are combined to control the switch assembly, so that the PFC Boost voltage increase circuits of different power supply blocks are jointly used, and the PFC Boost voltage increase circuits are used in series and in parallel through the control of the switch assembly. In this way, the driving parts of the PFC Boost voltage increase circuits of each independent power supply circuit block are integrated, the driving parts of the three-way PFC Boost voltage increase circuits are connected in series and in parallel according to different power supply conditions through the control of the switch assembly on the basis of the original circuit, the circuit stability is improved, and the power factor is improved.

[0053] In some embodiments, the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit are combined in step S130 to control the switching assembly, the step-down unit, the first step-up unit, the second step-up unit, and the third step-up unit to adjust the power supply state of the hybrid power supply system, including: in the case where the switching assembly includes a first switch, and the switching assembly further includes at least one of a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch, the on-off of the corresponding switches in the switching assembly is controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, and the step-down unit, the first step-up unit, the second step-up unit, and the third step-up unit are controlled in combination to adjust the series-parallel connection relationship of the first step-up unit, the second step-up unit, and the step-up unit in the hybrid power supply system, so that the first step-up unit, the second step-up unit, and the third step-up unit jointly supply power to achieve adjustment of the power supply state of the hybrid power supply system.

[0054] In the scheme of the present application, by controlling the on-off of the corresponding switches in the switching assembly in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit when the photovoltaic air conditioner is started and running, the three-way PFC Boost step-up circuit can achieve higher circuit utilization rate through the control of the switching assembly, and the stability of the circuit is also improved. Moreover, by controlling the switching assembly under the condition that the circuit type is determined, the problem of low power factor of the circuit is solved. The improvement of the circuit power factor refers to the use of the interleaved PFC structure of the energy storage assembly (such as a storage battery) in the scheme of the present application through the control of the switching assembly, which is beneficial to the improvement of the power factor and reduces power consumption.

[0055] In some embodiments, the power supply state of the hybrid power supply system includes a preset first state; the power supply state of the hybrid power supply system further includes at least one of a preset second state, a preset third state, a preset fourth state, a preset fifth state, a preset sixth state, and a preset seventh state.

[0056] In the preset first state, only the mains supplies power, the first switch is closed, the remaining switches in the switch assembly except the first switch are all disconnected (such as the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all disconnected), and the PWM wave of the switch tube in the first voltage boosting unit is controlled to make the voltage of the mains after rectification and one-stage voltage boosting rise to the DC bus voltage of the bus capacitor unit.

[0057] In the preset second state, only the photovoltaic assembly supplies power, the second switch and the fifth switch are both closed, the remaining switches in the switch assembly except the second switch and the fifth switch are all disconnected (such as the first switch, the third switch, the fourth switch, the sixth switch and the seventh switch are all disconnected), and the PWM wave of the switch tube in the second voltage boosting unit is controlled to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit.

[0058] In the preset third state, the energy storage assembly is charged in the state that only the photovoltaic assembly supplies power, the fourth switch and the sixth switch are closed, the remaining switches in the switch assembly except the second switch, the fourth switch, the fifth switch and the sixth switch are all disconnected (such as the first switch, the third switch and the seventh switch are all disconnected), and the switch tube in the voltage reducing unit is controlled to charge the energy storage assembly.

[0059] The fourth preset state is a state in which only the photovoltaic voltage of the photovoltaic assembly is supplied after two-stage voltage boosting by the first voltage boosting unit and the second voltage boosting unit; in the case where the switch assembly includes the first switch and further includes at least one of the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch, in the fourth preset state, the photovoltaic voltage of the photovoltaic assembly is supplied after two-stage voltage boosting by the first voltage boosting unit and the second voltage boosting unit, the second switch and the third switch are closed, the remaining switches in the switch assembly other than the second switch and the third switch are all open (for example, the first switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all open), and the PWM wave of the switch tube in the first voltage boosting unit and the PWM wave of the switch tube in the second voltage boosting unit are controlled to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit after two-stage voltage boosting.

[0060] The fifth preset state is a state in which the photovoltaic assembly and the commercial power are mixed to supply power; in the case where the switch assembly includes the first switch and further includes at least one of the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch, in the fifth preset state, the photovoltaic assembly and the commercial power are mixed to supply power, the first switch, the second switch and the fifth switch are closed, the remaining switches in the switch assembly other than the first switch, the second switch and the fifth switch are all open (for example, the third switch, the fourth switch, the sixth switch and the seventh switch are all open), and the PWM wave of the switch tube in the first voltage boosting unit and the PWM wave of the switch tube in the second voltage boosting unit are controlled to make the photovoltaic assembly and the commercial power mixed to supply power.

[0061] The sixth preset state is a state in which only the energy storage assembly supplies power; in the case where the switch assembly includes the first switch and further includes at least one of the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch, in the sixth preset state, only the energy storage assembly supplies power, the fourth switch, the fifth switch, the sixth switch and the seventh switch are closed, the remaining switches in the switch assembly other than the fourth switch, the fifth switch, the sixth switch and the seventh switch are all open (for example, the first switch, the second switch and the third switch are all open), and the PWM wave of the switch tube in the third voltage boosting unit is controlled to make the energy storage voltage of the energy storage assembly rise to the DC bus voltage of the bus capacitor unit after one-stage voltage boosting.

[0062] The preset seventh state is a state of hybrid power supply of the energy storage assembly and the commercial power. In the case that the switch assembly includes the first switch and further includes at least one of the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch, in the preset seventh state, the energy storage assembly is hybrid powered with the commercial power, the first switch, the fourth switch, the fifth switch and the sixth switch are closed, the remaining switches of the switch assembly except the first switch, the fourth switch, the fifth switch and the sixth switch are all disconnected (for example, the second switch, the third switch and the seventh switch are all disconnected), and the PWM wave of the switch tube in the first boost unit and the PWM wave of the switch tube in the third boost unit are controlled to hybrid power the energy storage assembly and the commercial power, specifically, the PWM wave of the switch tube in the first boost unit is controlled to make the voltage of the commercial power after rectification and one-stage boost to the DC bus voltage of the bus capacitor unit, and the PWM wave of the switch tube in the third boost unit is controlled to make the energy storage voltage of the energy storage assembly to one-stage boost to the DC bus voltage of the bus capacitor unit, so as to hybrid power the photovoltaic assembly and the commercial power.

[0063] Figure 3 A flowchart of an embodiment of a hybrid power supply strategy of a three-way hybrid power supply circuit of an off-grid photovoltaic air conditioner, Figure 4 A flowchart of another embodiment of a hybrid power supply strategy of a three-way hybrid power supply circuit of an off-grid photovoltaic air conditioner. Figure 3 And Figure 4 Specifically, in the operation of the off-grid photovoltaic air conditioner, the flowchart of the hybrid power supply use strategy of the three-way PFC Boost boost circuit of the three-way hybrid power supply circuit is used in series and parallel. Before executing the hybrid power supply strategy of the three-way hybrid power supply circuit of the off-grid photovoltaic air conditioner as shown in Figure 3 And Figure 4 Before the hybrid power supply strategy of the three-way hybrid power supply circuit of the off-grid photovoltaic air conditioner is executed, it is necessary to determine the hybrid power supply state of the three-way hybrid power supply circuit of the off-grid photovoltaic air conditioner in advance; the hybrid power supply state of the three-way hybrid power supply circuit of the off-grid photovoltaic air conditioner includes: a preset first state, a preset second state, a preset third state, a preset fourth state, a preset fifth state, a preset sixth state and a preset seventh state.

[0064] The preset first state is only commercial power supply, that is, the closed state of the switch K1 is maintained. The only commercial power supply in the preset first state means that in the case that the photovoltaic assembly and the energy storage assembly power supply block are insufficient, the commercial power supply is performed to ensure the operation of the off-grid photovoltaic air conditioner.

[0065] The preset second state: only photovoltaic module power supply, open switch K1, close switch K2 and switch K5, coordinate control switch tube Q2 PWM wave, such as adjusting the duty cycle of switch tube Q2 PWM control signal, make photovoltaic input voltage Vdc of photovoltaic module rise to DC bus voltage Vmx. Only photovoltaic air conditioner in the preset second state refers to that when detecting that the photovoltaic input voltage reaches the system preset second stage value, only the first PFC Boost circuit can be used.

[0066] The preset third state: in the only photovoltaic module power supply state, close switch K4 and switch K6, coordinate control switch tube in Buck circuit, charge energy storage component (such as battery). The preset third state is based on the preset second state, while meeting the operation of off-grid photovoltaic air conditioner, the excess power can be stored in the energy storage component (such as battery) to avoid resource waste.

[0067] The preset fourth state: the photovoltaic input voltage Vdc of photovoltaic module is insufficient for sufficient use, but the photovoltaic input voltage Vdc of photovoltaic module can maintain the normal use of off-grid photovoltaic air conditioner after two-stage boosting, that is, open switch K1, close switch K2 and third switch K3, coordinate control switch tube Q1 and switch tube Q2 PWM wave, such as adjusting the duty cycle of switch tube Q1 and switch tube Q2 PWM control signal, make photovoltaic input voltage Vdc of photovoltaic module rise to DC bus voltage Vmx. The preset fourth state is compared with the preset second state, when meeting the system first stage, but not meeting the second stage, through the control of switch K1, switch K2 and third switch K3, make photovoltaic module two-stage PFC Boost circuit boost, so that the boost ratio of each stage is reduced, compared with single-stage boost, the reliability of the circuit is improved.

[0068] The preset fifth state: photovoltaic module and commercial power are used together, that is, close switch K2 and switch K5, coordinate control switch tube Q1 and switch tube Q2 PWM wave, such as adjusting the duty cycle of switch tube Q1 and switch tube Q2 PWM control signal, make photovoltaic module and commercial power be used together. The preset fifth state is compared with the preset fourth state, when not meeting the two-stage boost condition of the preset fourth state, the photovoltaic module is used as an auxiliary electric energy to control the mixed power supply with commercial power.

[0069] The preset sixth state is that only the energy storage assembly (such as a battery) is powered, switch K1 is disconnected, switches K4, K5, K6 and K7 are closed, and the energy storage part enters a three-way interleaved PFC Boost voltage boosting circuit. The preset sixth state refers to that after it is detected that the voltage of the energy storage assembly (such as a battery) can be used, the three-way interleaved parallel structure is used to improve the power factor and the reliability of the circuit. In the scheme of the application, the energy storage scheme refers to a low-voltage energy storage scheme. If the low-voltage energy storage scheme is directly used for voltage boosting, the voltage boosting multiple is high, and the heat generation is serious. The heat generation of the low-voltage DCDC energy storage scheme is more serious than that of the high-voltage DCDC energy storage scheme.

[0070] The preset seventh state is that the energy storage assembly (such as a battery) is used in combination with commercial power, switches K4, K5 and K6 are closed, and the energy storage enters a two-way parallel PFC Boost voltage boosting circuit to be used in combination with commercial power. The preset seventh state refers to that the lowest use condition of the energy storage is met, the structure of the original PFC Boost voltage boosting circuit of alternating current is reserved, the energy storage part is connected in parallel with the PFC Boost voltage boosting circuit of photovoltaic, two-way PFC Boost voltage boosting circuits are interleaved in parallel, and alternating current is used for electric energy supplement. The circuit utilization rate is improved, and the stability of the circuit is more guaranteed.

[0071] In the scheme of the application, under the condition that the photovoltaic air conditioner is started and runs, the on-off of the corresponding switch in the switch assembly is controlled by combining the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly and the direct-current bus voltage of the bus capacitor unit. The three-way PFC Boost voltage boosting circuit is controlled by the switch assembly, the power supply state of the hybrid power supply system is in any one of the preset first state, the preset second state, the preset third state, the preset fourth state, the preset fifth state, the preset sixth state and the preset seventh state, higher circuit utilization rate can be achieved, and the stability of the circuit is improved.

[0072] In some embodiments, the voltage reducing unit comprises a Buck circuit, and each of the first voltage boosting unit and the second voltage boosting unit comprises a PFC Boost voltage boosting circuit.

[0073] In the case that the power supply state of the hybrid power supply system includes a preset first state, a preset second state and a preset third state, the first control process of adjusting the power supply state of the hybrid power supply system in the method of the application is combined with the photovoltaic voltage of the photovoltaic module, the energy storage voltage of the energy storage module, the residual capacity of the energy storage module and the DC bus voltage of the bus capacitor unit to control the opening and closing of the corresponding switches in the switch assembly, and combined with the control of the voltage reduction unit, the first voltage increasing unit, the second voltage increasing unit and the third voltage increasing unit to jointly supply power by the first voltage increasing unit, the second voltage increasing unit and the third voltage increasing unit, so as to realize the adjustment of the power supply state of the hybrid power supply system, including a first control process of adjusting the power supply state of the hybrid power supply system.

[0074] The first control process of adjusting the power supply state of the hybrid power supply system in the method of the application will be further described below with reference to the flowchart of an embodiment of the first control process of adjusting the power supply state of the hybrid power supply system in the method of the application. Figure 6 The first control process of adjusting the power supply state of the hybrid power supply system in the method of the application will be further described below with reference to the flowchart of an embodiment of the first control process of adjusting the power supply state of the hybrid power supply system in the method of the application.

[0075] In the case that the power supply state of the hybrid power supply system is only the state of the power supply of the power grid, i.e. the preset first state, step S210 is performed to determine whether the photovoltaic voltage of the photovoltaic module is greater than a first set voltage threshold value; wherein the first set voltage threshold value is, for example, a set photovoltaic required voltage threshold value Vset1.

[0076] In the case that the power supply state of the hybrid power supply system is only the state of the power supply of the power grid, i.e. the preset first state, step S210 is performed to determine whether the photovoltaic voltage of the photovoltaic module is greater than a first set voltage threshold value; wherein the first set voltage threshold value is, for example, a set photovoltaic required voltage threshold value Vset1.

[0077] In the case that the power supply state of the hybrid power supply system is only the state of the power supply of the power grid, i.e. the preset first state, step S210 is performed to determine whether the photovoltaic voltage of the photovoltaic module is greater than a first set voltage threshold value; wherein the first set voltage threshold value is, for example, a set photovoltaic required voltage threshold value Vset1.

[0078] Step S240, after adjusting the power supply state of the hybrid power supply system to the preset second state, that is, when it is determined that the photovoltaic voltage of the photovoltaic component is greater than the first set voltage threshold, when it is determined that the photovoltaic voltage of the photovoltaic component is greater than the second set voltage threshold, and when the power supply state of the hybrid power supply system is adjusted to the preset second state, determine whether the energy storage component needs to be charged according to the energy storage voltage of the energy storage component.

[0079] Step S250: When it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold, when it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than a second set voltage threshold, and when the power supply state of the hybrid power supply system is adjusted to a preset second state, and when the switch assembly includes a first switch, and the switch assembly further includes a second switch, a fourth switch, a fifth switch, and a sixth switch, if it is determined that the energy storage assembly needs to be charged, then, in a state where only the photovoltaic assembly is supplying power, the fourth switch and the sixth switch are controlled to be closed, and the remaining switches in the switch assembly except the second switch, the fourth switch, the fifth switch, and the sixth switch are controlled to be disconnected (such as the first switch, the third switch, and the seventh switch are all disconnected), and the switch tube in the step-down unit is controlled to charge the energy storage assembly, so as to adjust the power supply state of the hybrid power supply system to a state where the energy storage assembly is charged when only the photovoltaic assembly is supplying power, that is, the preset third state. Of course, when it is determined that the photovoltaic voltage of the photovoltaic component is greater than the first set voltage threshold, it is determined that the photovoltaic voltage of the photovoltaic component is greater than the second set voltage threshold, and the power supply state of the hybrid power supply system is adjusted to the preset second state, if it is determined that the energy storage component does not need to be charged, the power supply state of the hybrid power supply system is maintained at the preset second state.

[0080] Specifically, if Figure 3 As shown in FIG, the hybrid power supply strategy of the three-way hybrid power supply circuit for off-grid photovoltaic air conditioners includes:

[0081] Step S1: By default, the switch K1 is in a normally closed state, that is, the off-grid photovoltaic air conditioner is started by the mains power. After the unit where the off-grid photovoltaic air conditioner is located runs stably, the hybrid power supply strategy control is started. For example, after the off-grid photovoltaic air conditioner is started for a set time, the unit where the off-grid photovoltaic air conditioner is located runs stably, and then step S2 is executed to start the hybrid power supply strategy control.

[0082] Step S2: Detection Figure 2The photovoltaic input voltage Vdc of the middle photovoltaic module is compared with the set photovoltaic requirement voltage threshold Vset1 to determine their relationship: if the photovoltaic input voltage Vdc > the set photovoltaic requirement voltage threshold Vset1, then jump to step S3; otherwise, if the photovoltaic input voltage Vdc ≤ the set photovoltaic requirement voltage threshold Vset1, then jump to step S7.

[0083] Step S3: In the case of photovoltaic input voltage Vdc > set photovoltaic requirement voltage threshold Vset1, the photovoltaic input voltage Vdc is compared with the set photovoltaic sufficient voltage threshold Vset2 to determine their relationship: if the photovoltaic input voltage Vdc > the set photovoltaic sufficient voltage threshold Vset2, then jump to step S4; otherwise, if the photovoltaic input voltage Vdc ≤ the set photovoltaic sufficient voltage threshold Vset2, then jump to step S6.

[0084] Step S4: In the case of photovoltaic input voltage Vdc > set photovoltaic requirement voltage threshold Vset1 and photovoltaic input voltage Vdc > set photovoltaic sufficient voltage threshold Vset2, it indicates that the photovoltaic module energy is sufficient at this time, and photovoltaic module power supply can be directly used, entering the photovoltaic module power supply mode, that is, entering the preset second state, and then performing step S5. In the preset second state, only the photovoltaic module supplies power, the switch K1 is disconnected, the switch K2 and the switch K5 are closed, and the PWM wave of the switch tube Q2 is coordinately controlled to make the photovoltaic input voltage Vdc of the photovoltaic module rise to the direct current bus voltage Vmx.

[0085] Step S5: After entering the preset second state, it is determined whether the energy storage module (such as a battery) needs to be charged. If yes, the preset third state is entered; otherwise, the preset second state is maintained. In the preset second state, only the photovoltaic module supplies power, the switch K1 is disconnected, the switch K2 and the switch K5 are closed, and the PWM wave of the switch tube Q2 is coordinately controlled to make the photovoltaic input voltage Vdc of the photovoltaic module rise to the direct current bus voltage Vmx. In the preset third state, in the photovoltaic module power supply state, the switch K4 and the switch K6 are closed, and the switch tube in the Buck circuit is coordinately controlled, such as the duty cycle of the PWM signal of the switch tube in the Buck circuit, to charge the energy storage module (such as a battery).

[0086] The scheme of the present application, by combining the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the remaining power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, controls the opening and closing of the corresponding switches in the switch assembly when the photovoltaic air conditioner is running after starting, so that the three-way PFC Boost voltage boosting circuit is controlled by the switch assembly, and the power supply state of the hybrid power supply system is in any one of the preset first state, the preset second state, and the preset third state, which can achieve higher circuit utilization rate and improve the stability of the circuit.

[0087] In some embodiments, each of the first voltage boosting unit and the second voltage boosting unit comprises a PFC Boost voltage boosting circuit.

[0088] In the case where the power supply state of the hybrid power supply system includes the preset first state, the preset fourth state, and the preset fifth state, the second control process for adjusting the power supply state of the hybrid power supply system in step S130 further comprises: controlling the opening and closing of the corresponding switches in the switch assembly in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the remaining power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, and controlling the voltage reducing unit, the first voltage boosting unit, the second voltage boosting unit, and the third voltage boosting unit in combination to jointly supply power by the first voltage boosting unit, the second voltage boosting unit, and the third voltage boosting unit, so as to adjust the power supply state of the hybrid power supply system.

[0089] The following will be described in combination with Figure 7 The second control process for adjusting the power supply state of the hybrid power supply system in the method of the present application is further illustrated by an embodiment flowchart of the second control process for adjusting the power supply state of the hybrid power supply system in the method of the present application, and the specific process of the second control process for adjusting the power supply state of the hybrid power supply system in step S130 comprises: steps S310 to S350.

[0090] In step S310, in the case where the power supply state of the hybrid power supply system is only the state of the mains power supply, i.e., the preset first state, it is determined whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; wherein the first set voltage threshold is, for example, a set photovoltaic required voltage threshold Vset1.

[0091] In step S320, if it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the first set voltage threshold, it is determined whether the photovoltaic voltage of the photovoltaic assembly is greater than a second set voltage threshold; the second set voltage threshold is greater than the first set voltage threshold; wherein the second set voltage threshold is, for example, a set photovoltaic sufficient voltage threshold Vset2.

[0092] Step S330, in the case that the photovoltaic voltage of the photovoltaic assembly is determined to be greater than the first set voltage threshold, if the photovoltaic voltage of the photovoltaic assembly is determined to be less than or equal to the second set voltage threshold, it is determined whether the photovoltaic voltage of the photovoltaic assembly can reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting.

[0093] Step S340, in the case that the photovoltaic voltage of the photovoltaic assembly is determined to be greater than the first set voltage threshold and the photovoltaic voltage of the photovoltaic assembly is determined to be less than or equal to the second set voltage threshold, in the case that the switch assembly includes the first switch and the switch assembly further includes the second switch and the third switch, if the photovoltaic voltage of the photovoltaic assembly is determined to be able to reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, the second switch and the third switch are controlled to be closed, the remaining switches in the switch assembly other than the second switch and the third switch are controlled to be opened (for example, the first switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are opened), and the PWM wave of the switch tube in the first voltage boosting unit and the PWM wave of the switch tube in the second voltage boosting unit are controlled to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, so as to adjust the power supply state of the hybrid power supply system to be a state that only the photovoltaic voltage of the photovoltaic assembly is supplied after two-stage voltage boosting by the first voltage boosting unit and the second voltage boosting unit, i.e., a preset fourth state.

[0094] Step S350, in the case that the photovoltaic voltage of the photovoltaic assembly is determined to be greater than the first set voltage threshold and the photovoltaic voltage of the photovoltaic assembly is determined to be less than or equal to the second set voltage threshold, in the case that the switch assembly includes the first switch and the switch assembly further includes the second switch and the fifth switch, if it is determined that the photovoltaic voltage of the photovoltaic assembly cannot reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, the second switch and the fifth switch are controlled to be closed, the remaining switches in the switch assembly other than the first switch, the second switch and the fifth switch are controlled to be opened (for example, the third switch, the fourth switch, the sixth switch and the seventh switch are all opened), and the PWM wave of the switch tube in the first voltage boosting unit and the PWM wave of the switch tube in the second voltage boosting unit are controlled to make the photovoltaic assembly and the commercial power supply mixed power supply, specifically, the PWM wave of the switch tube in the first voltage boosting unit is controlled to make the voltage of the commercial power supply after rectification and one-stage voltage boosting rise to the DC bus voltage of the bus capacitor unit, and the PWM wave of the switch tube in the second voltage boosting unit is controlled to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit after one-stage voltage boosting, so that the photovoltaic assembly and the commercial power supply are mixed power supply, so as to adjust the power supply state of the mixed power supply system to the state of the mixed power supply of the photovoltaic assembly and the commercial power supply, that is, the preset fifth state.

[0095] Specifically, as shown in Figure 3 the mixed power supply strategy of the three-way mixed power supply circuit of the off-grid photovoltaic air conditioner further includes: step S6: in the case that the photovoltaic input voltage Vdc> set photovoltaic requirement voltage threshold Vset1 and the photovoltaic input voltage Vdc≤ set photovoltaic sufficient voltage threshold Vset2, it is judged whether the photovoltaic input voltage Vdc of the photovoltaic assembly can be used after two-stage voltage boosting: if the photovoltaic input voltage Vdc of the photovoltaic assembly can be used after two-stage voltage boosting, the fourth preset state is entered; otherwise, if the photovoltaic input voltage Vdc of the photovoltaic assembly cannot be used after two-stage voltage boosting, that is, the photovoltaic input voltage Vdc of the photovoltaic assembly is insufficient for power supply and needs to be supplemented by the commercial power supply, the fifth preset photovoltaic commercial power supply mode is entered. For example: if the photovoltaic input voltage Vdc is above 220V, it is used after one-stage voltage boosting; if the photovoltaic input voltage Vdc is between 160V and 220V, it is used after two-stage voltage boosting. In the fourth preset state, the switch K1 is opened, the switch K2 and the third switch K3 are closed, and the PWM waves of the switch tube Q1 and the switch tube Q2 are coordinated and controlled to make the photovoltaic input voltage Vdc of the photovoltaic assembly rise to the DC bus voltage Vmx. In the fifth preset state, the switch K2 and the switch K5 are closed, and the PWM waves of the switch tube Q1 and the switch tube Q2 are coordinated and controlled to make the photovoltaic assembly and the commercial power supply be used together.

[0096] The scheme of the present application can achieve higher circuit utilization rate and improve the stability of the circuit by controlling the opening and closing of the corresponding switches in the switch assembly in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit when the photovoltaic air conditioner is running after being started, so that the three-way PFC Boost voltage boosting circuit is controlled by the switch assembly, and the power supply state of the hybrid power supply system is in any one of the preset first state, the preset fourth state, and the preset fifth state.

[0097] In some embodiments, each of the first voltage boosting unit and the third voltage boosting unit comprises a PFC Boost voltage boosting circuit.

[0098] In the case where the power supply state of the hybrid power supply system comprises the preset first state and the preset sixth state, the opening and closing of the corresponding switches in the switch assembly are controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit in step S130, and the control of the voltage reducing unit, the first voltage boosting unit, the second voltage boosting unit, and the third voltage boosting unit is combined to jointly supply power by the first voltage boosting unit, the second voltage boosting unit, and the third voltage boosting unit to achieve the adjustment of the power supply state of the hybrid power supply system, and the third control process of adjusting the power supply state of the hybrid power supply system is further included.

[0099] The following will be described in combination with Figure 8 The third control process of adjusting the power supply state of the hybrid power supply system in the method of the present application is further described in combination with the embodiment flowchart of the third control process of adjusting the power supply state of the hybrid power supply system in the method of the present application, and the specific process of the third control process of adjusting the power supply state of the hybrid power supply system in step S130 is described, which comprises steps S410 to S430.

[0100] In step S410, in the case where the power supply state of the hybrid power supply system is the state of being supplied with power only by the mains, i.e., the preset first state, it is determined whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; wherein the first set voltage threshold is, for example, a set photovoltaic required voltage threshold Vset1.

[0101] In step S420, if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the first set voltage threshold, it is determined whether the energy storage voltage of the energy storage assembly is greater than a third set voltage threshold; wherein the third set voltage threshold is, for example, a set energy storage required voltage threshold Vset3.

[0102] Step S430, in the case that the photovoltaic voltage of the photovoltaic assembly is greater than the first set voltage threshold, in the case that the switch assembly comprises the first switch, and the switch assembly further comprises a fourth switch, a fifth switch, a sixth switch and a seventh switch, if it is determined that the energy storage voltage of the energy storage assembly is greater than the third set voltage threshold, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all controlled to be closed, the remaining switches in the switch assembly except the fourth switch, the fifth switch, the sixth switch and the seventh switch are all controlled to be opened (for example, the first switch, the second switch and the third switch are all opened), and the PWM wave of the switch tube in the third boost unit is controlled to make the energy storage voltage of the energy storage assembly rise to the DC bus voltage of the bus capacitor unit after one-stage voltage rise, so as to adjust the power supply state of the hybrid power supply system to the state that only the energy storage assembly supplies power, that is, the preset sixth state.

[0103] Specifically, as shown in the mixed power supply strategy of the three-way hybrid power supply circuit of the off-grid photovoltaic air conditioner, Figure 4 includes:

[0104] Step S7: in the case that the photovoltaic input voltage Vdc is less than or equal to the set photovoltaic requirement voltage threshold Vset1, the energy storage part voltage Vbat of the energy storage assembly is detected, and the size relationship between the energy storage part voltage Vbat and the set energy storage requirement voltage threshold Vset3 is judged: if the energy storage part voltage Vbat is greater than the set energy storage requirement voltage threshold Vset3, jump to step S8; otherwise, if the energy storage part voltage Vbat is less than or equal to the set energy storage requirement voltage threshold Vset3, enter step S9.

[0105] Step S8: in the case that the photovoltaic input voltage Vdc is less than or equal to the set photovoltaic requirement voltage threshold Vset1, and the energy storage part voltage Vbat is greater than the set energy storage requirement voltage threshold Vset3, the energy storage part can be used, the air conditioner enters the energy storage power supply use, and enters the preset sixth state, only the energy storage assembly (such as a storage battery) supplies power. In the preset sixth state, the switch K1 is opened, and the switches K4, K5, K6 and K7 are closed, so that the energy storage part enters the three-way staggered PFC Boost circuit.

[0106] The scheme of the application can achieve higher circuit utilization rate and improve the stability of the circuit by controlling the opening and closing of the corresponding switches in the switch assembly in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the remaining energy of the energy storage assembly and the DC bus voltage of the bus capacitor unit when the photovoltaic air conditioner is started and runs, making the power supply state of the hybrid power supply system in any one of the preset first state and the preset sixth state.

[0107] In some embodiments, each of the first and third boost units comprises a PFC Boost boost circuit.

[0108] In the case that the power supply state of the hybrid power supply system comprises the preset first state and the preset seventh state, the opening and closing of the corresponding switches of the switch assembly are controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly, and the DC bus voltage of the bus capacitor unit, and the first, second, and third boost units are controlled in combination to jointly supply power by the first, second, and third boost units, so as to realize the adjustment of the power supply state of the hybrid power supply system, and the fourth control process for adjusting the power supply state of the hybrid power supply system is further included.

[0109] The fourth control process for adjusting the power supply state of the hybrid power supply system in the method of the present application will be further described below with reference to the flowchart of an embodiment of the fourth control process for adjusting the power supply state of the hybrid power supply system in the method of the present application shown in FIG. 13. Figure 9 The fourth control process for adjusting the power supply state of the hybrid power supply system in the method of the present application will be further described below with reference to the flowchart of an embodiment of the fourth control process for adjusting the power supply state of the hybrid power supply system in the method of the present application shown in FIG. 13.

[0110] Step S510, in the case that the power supply state of the hybrid power supply system is the state of being supplied with power only by the mains, i.e., the preset first state, it is determined whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; wherein the first set voltage threshold is, for example, a set photovoltaic requirement voltage threshold Vset1.

[0111] Step S520, if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the first set voltage threshold, it is determined whether the energy storage voltage of the energy storage assembly is greater than a third set voltage threshold; wherein the third set voltage threshold is, for example, a set energy storage requirement voltage threshold Vset3.

[0112] Step S530, in the case that it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the first set voltage threshold, if it is determined that the energy storage voltage of the energy storage assembly is less than or equal to the third set voltage threshold, it is determined whether the residual power of the energy storage assembly meets a preset minimum starting power; wherein the preset minimum starting power is the minimum power for starting the photovoltaic air conditioner, for example, 10% of the maximum power of the energy storage assembly.

[0113] Step S540, in the case that the photovoltaic voltage of the photovoltaic assembly is determined to be greater than the first set voltage threshold and the energy storage voltage of the energy storage assembly is determined to be less than or equal to the third set voltage threshold, in the case that the switch assembly includes the first switch and the switch assembly further includes a fourth switch, a fifth switch and a sixth switch, if it is determined that the remaining power of the energy storage assembly meets the preset minimum starting power, the fourth switch, the fifth switch and the sixth switch are controlled to be closed, and the remaining switches in the switch assembly other than the first switch, the fourth switch, the fifth switch and the sixth switch are controlled to be opened (for example, the second switch, the third switch and the seventh switch are all opened), and the PWM wave of the switch tube in the first boost unit and the PWM wave of the switch tube in the third boost unit are controlled to make the energy storage assembly and the commercial power supply in hybrid, specifically, the PWM wave of the switch tube in the first boost unit is controlled to make the voltage of the commercial power after rectification rise to the DC bus voltage of the bus capacitor unit after one-stage boost, and the PWM wave of the switch tube in the third boost unit is controlled to make the energy storage voltage of the energy storage assembly rise to the DC bus voltage of the bus capacitor unit after one-stage boost, so as to make the photovoltaic assembly and the commercial power supply in hybrid to adjust the power supply state of the hybrid power supply system to the state that the energy storage assembly and the commercial power supply are in hybrid, that is, the preset seventh state.

[0114] Step S550, in the case that the photovoltaic voltage of the photovoltaic assembly is determined to be greater than the first set voltage threshold and the energy storage voltage of the energy storage assembly is determined to be less than or equal to the third set voltage threshold, in the case that the switch assembly includes the first switch, if it is determined that the remaining power of the energy storage assembly does not meet the preset minimum starting power, the first switch is maintained to be closed, the remaining switches in the switch assembly other than the first switch are maintained to be opened (for example, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are all opened), and the PWM wave of the switch tube in the first boost unit is maintained to make the voltage of the commercial power after rectification rise to the DC bus voltage of the bus capacitor unit after one-stage boost, so as to maintain the power supply state of the hybrid power supply system to the state that only the commercial power supplies, that is, the preset first state.

[0115] Specifically, as Figure 4As shown, the hybrid power supply strategy of the three-way hybrid power supply circuit of the off-grid photovoltaic air conditioner also includes: in the case that the photovoltaic input voltage Vdc is less than or equal to the set photovoltaic requirement voltage threshold Vset1, and the energy storage part voltage Vbat is less than or equal to the set energy storage requirement voltage threshold Vset3, it is indicated that the remaining power of the energy storage component (such as a battery) is insufficient, the current remaining power of the energy storage component (such as a battery) is detected, and whether the current remaining power of the energy storage component (such as a battery) meets the minimum starting requirement is judged according to the state of the detected current remaining power of the energy storage component (such as a battery): if it meets, it enters a preset seventh state, and the photovoltaic air conditioner enters the energy storage component (such as a battery) and mains hybrid power supply state; if it does not meet, the preset first state is maintained, and only mains power supply is provided. Generally, the energy storage component has an internal control mainboard, the mainboard of the off-grid photovoltaic air conditioner and the mainboard of the battery communicate with each other to obtain the information of the battery and judge the state of the energy storage component. The voltage of the battery is floating with the power of the battery, and it is generally considered that the power of the battery is sufficient when it is above 30%; when the power of the battery is between 30% and 10%, the separate energy storage power supply is not sufficient and needs to be joined by the peripheral power supply. In the preset first state, only mains power supply is provided, that is, the closed state of switch K1 is maintained. In the preset seventh state, switches K4, K5 and K6 are closed, so that the energy storage enters the two-way parallel PFC Boost circuit and the mains hybrid power supply.

[0116] In the scheme of the present application, by combining the photovoltaic voltage of the photovoltaic component, the energy storage voltage of the energy storage component, the remaining power of the energy storage component, and the DC bus voltage of the bus capacitor unit when the photovoltaic air conditioner is running after starting, the opening and closing of the corresponding switches in the switch assembly are controlled, so that the three-way PFC Boost circuit is controlled by the switch assembly, and the power supply state of the hybrid power supply system is in any one of the preset first state and the preset seventh state, which can achieve higher circuit utilization rate and improve the stability of the circuit.

[0117] In the scheme of the present application, the three-way PFC Boost circuit is controlled by the switch assembly, and when only the photovoltaic component or the energy storage component supplies power, the parallel structure of the driving part of the three-way PFC Boost circuit reduces the output current of the single-way PFC Boost circuit, improves the power factor, and reduces the power consumption. In the scheme of the present application, the three-way PFC Boost circuit is controlled by the switch assembly, and when the circuit type is determined, the switch assembly is controlled to reduce the selection of components of the PFC Boost circuit of the energy storage component, which reduces the cost to a certain extent.

[0118] In some schemes, the photovoltaic module is directly connected to the air conditioner without power conversion, reducing intermediate conversion loss; but the photovoltaic module directly connected to the air conditioner is unreliable. Generally, the power of the air conditioner is large, the photovoltaic input is directly connected, the photovoltaic panel cannot work at the maximum power point, the air conditioner DC bus voltage Vmx is unstable, the air conditioner is prone to failure, the photovoltaic panel has a large light rejection rate, the payback period is long, the income is poor, and the heat generation is large, which will shorten the service life of the photovoltaic panel. The scheme of the present application is not only for the photovoltaic module power supply part, but also for the power supply strategy of the energy storage part.

[0119] Some schemes are in the photovoltaic mains hybrid power supply mode, by detecting the mains voltage ratio, to switch the PFC purposefully, to reduce the switching loss. The scheme of the present application involves the power supply strategy of the three blocks of mains, photovoltaic module and energy storage. On the basis of the original PFC structure, by using the existing conditions, through the control of the switching component, the utilization rate of the circuit is higher, and the reliability is also improved; the detection is power rather than voltage, and the PFC of the photovoltaic module and the mains is started synchronously to raise the DC bus voltage Vmx.

[0120] Since the processing and functions realized by the method of the embodiment basically correspond to the foregoing photovoltaic air conditioner embodiments, principles and examples, the description of the embodiment does not elaborate on the foregoing embodiments, and is not repeated here.

[0121] In summary, those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0122] The above only describes the embodiments of the present application and is not intended to limit the present application. 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 principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control device of a hybrid power supply system, characterized by comprising: The external input source of the hybrid power supply system includes a photovoltaic assembly, an energy storage assembly and a commercial power supply; the hybrid power supply system includes a switch assembly, a step-down unit, a first step-up unit, a second step-up unit, a third step-up unit, a rectifier unit, a bus capacitor unit and an inverter unit; an output end of the energy storage assembly is connected to the bus capacitor unit through the step-down unit and the third step-up unit; an output end of the photovoltaic assembly is connected to the bus capacitor unit through the second step-up unit and is also connected to an input end of the third step-up unit; an output end of the commercial power supply is connected to a power supply end of a load in a photovoltaic power consumption device through the rectifier unit, the first step-up unit, the bus capacitor unit and the inverter unit; the switch assembly is connected to the step-down unit, the first step-up unit, the second step-up unit, the third step-up unit, the rectifier unit and the bus capacitor unit respectively; a control device of the hybrid power supply system includes an acquisition unit and a control unit; wherein The control unit is configured to control the switch assembly to make the power supply state of the hybrid power supply system be a state of only the commercial power supply in a case that the photovoltaic power consumption device is powered on; The acquisition unit is configured to acquire a photovoltaic voltage of the photovoltaic assembly, acquire an energy storage voltage of the energy storage assembly, acquire a remaining amount of electricity of the energy storage assembly and acquire a direct current bus voltage of the bus capacitor unit in a case that the photovoltaic power consumption device is started to run after being started; The control unit is further configured to control the switch assembly, the step-down unit, the first step-up unit, the second step-up unit and the third step-up unit in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the remaining amount of electricity of the energy storage assembly and the direct current bus voltage of the bus capacitor unit to realize adjustment of the power supply state of the hybrid power supply system; The switch assembly further includes a third switch, a fifth switch, a sixth switch and a seventh switch; the third switch is arranged between an output end of the second step-up unit and an input end of the first step-up unit; the fifth switch is arranged between the output end of the second step-up unit and a positive electrode of the bus capacitor unit; the sixth switch is arranged between the input end of the third step-up unit and an input end of the second step-up unit; and the seventh switch is arranged between the input end of the second step-up unit and the input end of the first step-up unit; so that the first step-up unit, the second step-up unit and the third step-up unit are arranged in series and in parallel to adjust different power supply states of the hybrid power supply system.

2. The control device of the mixed power supply system according to claim 1, characterized by, The switch assembly includes a first switch; the switch assembly further includes at least one of a second switch and a fourth switch; wherein the first switch is arranged between an output end of the commercial power supply and an input end of the rectifier unit; the second switch is arranged between an output end of the photovoltaic assembly and an input end of the second step-up unit; and the fourth switch is arranged between an output end of the energy storage assembly and an input end of the step-down unit. The control unit controls the switch assembly, the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual electricity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, so as to adjust the power supply state of the hybrid power supply system, including: The control unit controls the on-off of the corresponding switch in the switch assembly in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual electricity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, and controls the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit, so that the first voltage increase unit, the second voltage increase unit and the third voltage increase unit jointly supply power, and adjust the power supply state of the hybrid power supply system.

3. A photovoltaic air conditioner characterized by, The control device of the hybrid power supply system according to any one of claims 1 to 2. The control device of the hybrid power supply system according to any one of claims 1 to 2.

4. A method of controlling a hybrid power supply system of a photovoltaic air conditioner as claimed in claim 3, characterized in that, In the case of powering on the photovoltaic air conditioner, the switch assembly is controlled so that the power supply state of the hybrid power supply system is in a state of being powered only by the commercial power supply; In the case of running after starting the photovoltaic air conditioner, the photovoltaic voltage of the photovoltaic assembly is obtained; the energy storage voltage of the energy storage assembly is obtained; the residual electricity of the energy storage assembly is obtained; and the DC bus voltage of the bus capacitor unit is obtained; The control unit controls the switch assembly, the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual electricity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, so as to adjust the power supply state of the hybrid power supply system, including: The control unit controls the switch assembly, the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual electricity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, so as to adjust the power supply state of the hybrid power supply system, including:

5. The method of claim 4, wherein the method further comprises: In the case that the switch assembly includes a first switch, the first switch is arranged between the output end of the commercial power supply and the input end of the rectifier unit; the first switch is controlled to be closed, the remaining switches in the switch assembly except the first switch are controlled to be disconnected, and the PWM wave of the switch tube in the first voltage increase unit is controlled to make the voltage of the commercial power supply after rectification rise to the DC bus voltage of the bus capacitor unit after one-stage voltage increase, so as to control the power supply state of the hybrid power supply system to be in a state of being powered only by the commercial power supply, i.e. a preset first state. And / or The control unit controls the switch assembly, the voltage reduction unit, the first voltage increase unit, the second voltage increase unit and the third voltage increase unit in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual electricity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, so as to adjust the power supply state of the hybrid power supply system, including: ​ ​ In the case that the switch assembly includes a first switch, and the switch assembly further includes at least one of a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a seventh switch, the first switch is arranged between the output end of the commercial power and the input end of the rectifier unit; the second switch is arranged between the output end of the photovoltaic assembly and the input end of the second voltage boosting unit; the third switch is arranged between the output end of the second voltage boosting unit and the input end of the first voltage boosting unit; the fourth switch is arranged between the output end of the energy storage assembly and the input end of the voltage reducing unit; the fifth switch is arranged between the output end of the second voltage boosting unit and the positive electrode of the bus capacitor unit; the sixth switch is arranged between the input end of the third voltage boosting unit and the input end of the second voltage boosting unit; the seventh switch is arranged between the input end of the second voltage boosting unit and the input end of the first voltage boosting unit; the opening and closing of the corresponding switches in the switch assembly are controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual capacity of the energy storage assembly and the direct current bus voltage of the bus capacitor unit, and the voltage reducing unit, the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit are controlled in combination to jointly supply power by the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit, so as to realize the adjustment of the power supply state of the hybrid power supply system.

6. The control method of the hybrid power supply system of the photovoltaic air conditioner according to claim 4 or 5, characterized in that, The power supply state of the hybrid power supply system includes a preset first state; the power supply state of the hybrid power supply system also includes at least one of a preset second state, a preset third state, a preset fourth state, a preset fifth state, a preset sixth state and a preset seventh state; wherein, The preset first state is a state of power supply by only the commercial power; The preset second state is a state of power supply by only the photovoltaic assembly; The preset third state is a state of charging the energy storage assembly in the state of power supply by only the photovoltaic assembly; The preset fourth state is a state of power supply by the photovoltaic voltage of the photovoltaic assembly after two-stage voltage boosting by the first voltage boosting unit and the second voltage boosting unit; The preset fifth state is a state of hybrid power supply by the photovoltaic assembly and the commercial power; The preset sixth state is a state of power supply by only the energy storage assembly; The preset seventh state is a state of hybrid power supply by the energy storage assembly and the commercial power.

7. The control method of the hybrid power supply system of the photovoltaic air conditioner according to claim 5, characterized in that, The voltage reducing unit includes a Buck circuit; each of the first voltage boosting unit and the second voltage boosting unit includes a PFC Boost voltage boosting circuit. In the case that the power supply state of the hybrid power supply system includes a preset first state, a preset second state and a preset third state, in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual capacity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, the opening and closing of the corresponding switches in the switch assembly are controlled, and in combination with the control of the voltage reduction unit, the first voltage increasing unit, the second voltage increasing unit and the third voltage increasing unit, the first voltage increasing unit, the second voltage increasing unit and the third voltage increasing unit are jointly powered to realize the adjustment of the power supply state of the hybrid power supply system, including: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the first set voltage threshold, determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a second set voltage threshold; the second set voltage threshold is greater than the first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the second set voltage threshold, controlling the second switch and the fifth switch to be closed, controlling the remaining switches in the switch assembly except the second switch and the fifth switch to be disconnected, and controlling the PWM wave of the switch tube in the second voltage increasing unit to increase the photovoltaic voltage of the photovoltaic assembly to the DC bus voltage of the bus capacitor unit, so as to adjust the power supply state of the hybrid power supply system to the state of only the photovoltaic assembly power supply, that is, the preset second state; after adjusting the power supply state of the hybrid power supply system to the preset second state, according to the energy storage voltage of the energy storage assembly, determining whether the energy storage assembly needs to be charged; if it is determined that the energy storage assembly needs to be charged, in the state of only the photovoltaic assembly power supply, controlling the fourth switch and the sixth switch to be closed, controlling the remaining switches in the switch assembly except the second switch, the fourth switch, the fifth switch and the sixth switch to be disconnected, and controlling the switch tube in the voltage reduction unit to charge the energy storage assembly, so as to adjust the power supply state of the hybrid power supply system to the state of charging the energy storage assembly in the state of only the photovoltaic assembly power supply, that is, the preset third state.

8. The control method of the hybrid power supply system of the photovoltaic air conditioner according to claim 5, characterized in that, Each of the first voltage increasing unit and the second voltage increasing unit includes a PFC Boost voltage increasing circuit. In the case that the power supply state of the hybrid power supply system includes a preset first state, a preset fourth state and a preset fifth state, in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual capacity of the energy storage assembly and the DC bus voltage of the bus capacitor unit, the opening and closing of the corresponding switches in the switch assembly are controlled, and in combination with the control of the voltage reduction unit, the first voltage increasing unit, the second voltage increasing unit and the third voltage increasing unit, the first voltage increasing unit, the second voltage increasing unit and the third voltage increasing unit are jointly powered to realize the adjustment of the power supply state of the hybrid power supply system, and further including: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is greater than the first set voltage threshold, determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a second set voltage threshold, the second set voltage threshold being greater than the first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the second set voltage threshold, determining whether the photovoltaic voltage of the photovoltaic assembly can reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting; if it is determined that the photovoltaic voltage of the photovoltaic assembly can reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, controlling the second switch and the third switch to be closed, controlling the remaining switches in the switch assembly other than the second switch and the third switch to be opened, and controlling the PWM wave of the switch tube in the first voltage boosting unit and the PWM wave of the switch tube in the second voltage boosting unit to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, so as to adjust the power supply state of the hybrid power supply system to a state in which only the photovoltaic voltage of the photovoltaic assembly is supplied after two-stage voltage boosting by the first voltage boosting unit and the second voltage boosting unit, i.e., a preset fourth state; if it is determined that the photovoltaic voltage of the photovoltaic assembly cannot reach the DC bus voltage of the bus capacitor unit after two-stage voltage boosting, controlling the second switch and the fifth switch to be closed, controlling the remaining switches in the switch assembly other than the first switch, the second switch and the fifth switch to be opened, and controlling the PWM wave of the switch tube in the first voltage boosting unit to make the voltage of the commercial power after rectification rise to the DC bus voltage of the bus capacitor unit, and controlling the PWM wave of the switch tube in the second voltage boosting unit to make the photovoltaic voltage of the photovoltaic assembly rise to the DC bus voltage of the bus capacitor unit after one-stage voltage boosting, so as to make the photovoltaic assembly and the commercial power supply in combination, thereby adjusting the power supply state of the hybrid power supply system to a state in which the photovoltaic assembly and the commercial power supply in combination, i.e., a preset fifth state.

9. The control method of the hybrid power supply system of the photovoltaic air conditioner according to claim 5, characterized in that, Each of the first voltage boosting unit and the third voltage boosting unit comprises a PFC Boost voltage boosting circuit. In the case that the power supply state of the hybrid power supply system comprises the preset first state and the preset sixth state, in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual energy of the energy storage assembly and the DC bus voltage of the bus capacitor unit, the opening and closing of the corresponding switches in the switch assembly are controlled, and the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit are controlled in combination, so as to realize the joint power supply of the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit, and adjust the power supply state of the hybrid power supply system, and the method further comprises: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the first set voltage threshold, determining whether the energy storage voltage of the energy storage assembly is greater than a third set voltage threshold; If it is determined that the energy storage voltage of the energy storage assembly is greater than a third set voltage threshold, the fourth switch, the fifth switch, the sixth switch and the seventh switch are controlled to be closed, the remaining switches in the switch assembly other than the fourth switch, the fifth switch, the sixth switch and the seventh switch are controlled to be opened, and the PWM wave of the switch tube in the third voltage boosting unit is controlled to make the energy storage voltage of the energy storage assembly rise to the DC bus voltage of the bus capacitor unit after one-stage voltage boosting, so as to adjust the power supply state of the hybrid power supply system to a state in which only the energy storage assembly supplies power, i.e. a preset sixth state.

10. The method of claim 5, wherein the method further comprises: Each of the first voltage boosting unit and the third voltage boosting unit comprises a PFC Boost voltage boosting circuit. In the case that the power supply state of the hybrid power supply system comprises a preset first state and a preset seventh state, the on-off of the corresponding switches in the switch assembly is controlled in combination with the photovoltaic voltage of the photovoltaic assembly, the energy storage voltage of the energy storage assembly, the residual power of the energy storage assembly and the DC bus voltage of the bus capacitor unit, and the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit are controlled in combination, so as to realize the joint power supply of the first voltage boosting unit, the second voltage boosting unit and the third voltage boosting unit, and to adjust the power supply state of the hybrid power supply system, and further comprising: determining whether the photovoltaic voltage of the photovoltaic assembly is greater than a first set voltage threshold; if it is determined that the photovoltaic voltage of the photovoltaic assembly is less than or equal to the first set voltage threshold, determining whether the energy storage voltage of the energy storage assembly is greater than a third set voltage threshold; if it is determined that the energy storage voltage of the energy storage assembly is less than or equal to the third set voltage threshold, determining whether the residual power of the energy storage assembly meets a preset minimum starting power; wherein the preset minimum starting power is the minimum power for starting the photovoltaic air conditioner; if it is determined that the residual power of the energy storage assembly meets the preset minimum starting power, the fourth switch, the fifth switch and the sixth switch are controlled to be closed, the remaining switches in the switch assembly other than the first switch, the fourth switch, the fifth switch and the sixth switch are controlled to be opened, the PWM wave of the switch tube in the first voltage boosting unit is controlled to make the voltage of the commercial power after rectification rise to the DC bus voltage of the bus capacitor unit after one-stage voltage boosting, and the PWM wave of the switch tube in the third voltage boosting unit is controlled to make the energy storage voltage of the energy storage assembly rise to the DC bus voltage of the bus capacitor unit after one-stage voltage boosting, so as to make the photovoltaic assembly and the commercial power supply in combination, and to adjust the power supply state of the hybrid power supply system to a state in which the energy storage assembly and the commercial power supply supply power in combination, i.e. a preset seventh state. If it is determined that the remaining power of the energy storage assembly does not meet the preset minimum starting power, the first switch is maintained in the closed state, the remaining switches in the switch assembly except the first switch are maintained in the open state, and the PWM wave of the switch tube in the first voltage boosting unit is maintained to enable the voltage of the commercial power after rectification to be boosted to the DC bus voltage of the bus capacitor unit by one stage, so as to maintain the power supply state of the hybrid power supply system as the state of being powered by the commercial power only, i.e. the preset first state.

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