Photovoltaic air conditioner with substrate protection function

Abstract

The present application relates to photovoltaic air conditioner control field, especially to a photovoltaic air conditioner with substrate protection function, comprising: a heat dissipation unit for dissipating heat generated by the air conditioner host to outdoor air, comprising a heat dissipation motor and a first temperature sensor; a photovoltaic power generation unit comprising a photovoltaic substrate and a second temperature sensor; an energy storage unit for storing the electric energy; a grid interaction unit for determining the energy storage capacity ratio of the energy storage unit according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate; a compensation control unit for determining whether to start the voltage compensation of the grid to the air conditioner according to the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage, and determining whether to adjust the rotating speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor. The present application realizes the reasonable distribution of electric energy and improves the stability of photovoltaic air conditioner operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic air conditioners, and particularly relates to a photovoltaic air conditioner with a substrate protection function. BACKGROUND

[0002] Under the background of global response to climate change and energy transformation, the use of renewable energy has received widespread attention. As a clean and renewable energy source, solar energy has rapidly developed photovoltaic power generation technology. Photovoltaic air conditioners have emerged as the times require, combining solar photovoltaic power generation with air conditioning systems. By converting solar energy into electricity through photovoltaic panels, the operation of air conditioners is powered, thereby reducing dependence on traditional grid power and reducing carbon emissions. The photovoltaic substrate is the core component of the photovoltaic system in the photovoltaic air conditioner, and its performance directly affects the power generation efficiency. However, the photovoltaic substrate faces various environmental challenges during actual use; in addition, it also faces the risk of mechanical damage. During installation and use, it may be impacted by natural disasters such as hail and sandstorms, and also faces the risk of mechanical damage. In summary, in order to improve the performance and service life of the photovoltaic substrate in the photovoltaic air conditioner and ensure the stable operation of the photovoltaic air conditioner, it is necessary to develop a photovoltaic air conditioner with perfect substrate protection function. This protection function not only needs to be able to cope with the influence of various environmental factors, but also needs to have an intelligent monitoring and protection mechanism, so as to fully exert the advantages of photovoltaic air conditioners and promote the effective application of renewable energy in the air conditioning field.

[0003] Chinese Patent Publication No. CN103486682B discloses a photovoltaic air conditioning system, which includes a photovoltaic cell array, an air conditioning unit, a current conversion unit, and a direct current bus. A current conversion unit is provided between the public power grid and the inverter unit, and the capacity of the current conversion unit is configured according to the demand of the photovoltaic cell array or the public power grid. The inverter unit is provided as a standard component of the air conditioning unit, and the direct current generated by the photovoltaic cell array and the direct current rectified by the current conversion unit are supplied to the inverter unit to power the air conditioning unit. It can be seen that the photovoltaic air conditioning system has the problem of decreased operation stability of the photovoltaic air conditioner due to inaccurate monitoring of the influence of environmental temperature or air conditioning outdoor unit heat dissipation temperature on the operation of the photovoltaic air conditioner and interference of the heat dissipation water droplets discharged by the air conditioners of other users above the air conditioner with the heat dissipation of the air conditioner below. SUMMARY

[0004] Therefore, the present application provides a photovoltaic air conditioner with a substrate protection function to overcome the problem of decreased operation stability of the photovoltaic air conditioner due to inaccurate monitoring of the influence of environmental temperature or air conditioning outdoor unit heat dissipation temperature on the operation of the photovoltaic air conditioner and interference of the heat dissipation water droplets discharged by the air conditioners of other users above the air conditioner with the heat dissipation of the air conditioner below.

[0005] In order to achieve the above object, the application provides a photovoltaic air conditioner with a substrate protection function, comprising an air conditioner host, and further comprising:

[0006] A heat dissipation unit connected with the air conditioner host, used for dissipating heat generated by the air conditioner host operation to outdoor air, comprising a heat dissipation motor used for providing heat dissipation power and a first temperature sensor connected with the heat dissipation motor, used for detecting the heat dissipation temperature of the heat dissipation motor;

[0007] A photovoltaic power generation unit arranged above the heat dissipation unit, comprising a photovoltaic substrate arranged above the heat dissipation motor, used for converting solar energy into electric energy, and a second temperature sensor connected with the photovoltaic substrate, used for detecting the air temperature around the photovoltaic substrate;

[0008] An energy storage unit connected with the photovoltaic power generation unit, used for storing the electric energy;

[0009] A grid interaction unit connected with the photovoltaic power generation unit and the energy storage unit respectively, used for determining the energy storage proportion of the energy storage unit according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate;

[0010] A compensation control unit connected with the air conditioner host, the heat dissipation unit, the photovoltaic power generation unit, the energy storage unit and the grid interaction unit respectively, used for judging whether to start the voltage compensation of the grid to the air conditioner according to the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage, and determining whether to adjust the rotating speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor.

[0011] Further, the photovoltaic power generation unit further comprises:

[0012] A photovoltaic controller connected with the photovoltaic substrate, used for controlling the electric energy generated by the photovoltaic substrate 7;

[0013] A photovoltaic substrate support connected with the photovoltaic substrate, used for fixing the position of the photovoltaic substrate.

[0014] Further, the energy storage unit comprises:

[0015] A lithium battery pack connected with the photovoltaic substrate, used for storing the electric energy generated by the photovoltaic substrate;

[0016] An inverter connected with the lithium battery pack, used for converting the direct current of the lithium battery pack into alternating current for the air conditioner host.

[0017] Further, the grid interaction unit comprises:

[0018] A switch connected to the power supply line of the inverter and the air conditioner host respectively, for controlling the power supply mode of the air conditioner host;

[0019] A circuit breaker connected to the power supply line of the power grid and the air conditioner host respectively, for cutting off the power supply of the power grid to the photovoltaic air conditioner when the photovoltaic air conditioner fails or the current overload occurs;

[0020] The power supply mode includes the power supply of the power grid to the air conditioner host alone and the power supply of the power grid and the photovoltaic power generation unit to the air conditioner host cooperatively.

[0021] Further, the power generation efficiency of the photovoltaic substrate is the ratio of the output electric power of the photovoltaic substrate to the surface solar radiation power of the photovoltaic substrate.

[0022] Further, the power grid interaction unit is connected to the second temperature sensor, the photovoltaic substrate and the energy storage unit respectively, for obtaining the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate, and calculating the linear fitting degree of the power generation efficiency of the photovoltaic substrate and the air temperature around the photovoltaic substrate at several sampling time points.

[0023] If the linear fitting degree is greater than a preset linear fitting degree, the compensation control unit determines that the influence degree of the ambient temperature on the power generation efficiency of the photovoltaic substrate does not meet the requirements, and adjusts the energy storage capacity ratio of the energy storage unit.

[0024] Further, the energy storage capacity ratio of the energy storage unit is the ratio of the current storage capacity of the lithium battery pack to the maximum storage capacity of the lithium battery pack.

[0025] Further, the fluctuation range of the photovoltaic power generation voltage is the difference between the maximum power generation voltage and the minimum power generation voltage of the photovoltaic substrate within several sampling periods.

[0026] Further, the compensation control unit is connected to the photovoltaic substrate, the energy storage unit and the power grid interaction unit respectively, and is also used to obtain the fluctuation range of the photovoltaic power generation voltage and the power generation efficiency of the photovoltaic substrate.

[0027] Under the condition that the air temperature around the photovoltaic substrate is within a preset ambient temperature range and the power generation efficiency of the photovoltaic substrate is less than a preset power generation efficiency, if the fluctuation range of the photovoltaic power generation voltage is greater than a preset fluctuation range, the compensation control unit determines that the stability of the power grid does not meet the requirements, and starts to compensate the voltage of the air conditioner of the power grid;

[0028] The compensated voltage of the air conditioner is determined by the difference between the fluctuation range of the photovoltaic power generation voltage and the preset fluctuation range.

[0029] Further, the compensation control unit is connected with the photovoltaic substrate, the first temperature sensor and the heat dissipation unit respectively, and is further used to acquire the heat dissipation temperature of the heat dissipation motor, and calculate the difference between the decreasing amount of the heat dissipation temperature of the heat dissipation motor and the increasing amount of the air temperature around the photovoltaic substrate,

[0030] If the difference is less than a preset difference, the compensation control unit determines that the influence of the heat dissipation of the heat dissipation motor on the air temperature around the photovoltaic substrate exceeds the allowable range, and increases the rotating speed of the heat dissipation motor.

[0031] Compared with the prior art, the photovoltaic air conditioner has the beneficial effects that the photovoltaic air conditioner is provided with a heat dissipation unit, a photovoltaic power generation unit, an energy storage unit, a grid interaction unit and a compensation control unit, the energy storage power ratio of the energy storage unit is determined according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate, the problem of unstable power generation of the photovoltaic substrate caused by different weather and light conditions is overcome, and the energy utilization efficiency is improved; whether to start the voltage compensation of the grid to the air conditioner is determined according to the power generation efficiency of the photovoltaic substrate and the fluctuation range of the photovoltaic power generation voltage, the problem of abnormal voltage of the air conditioner caused by the change of the photovoltaic power generation efficiency and the unstable voltage of the grid itself is overcome, and the safety of the photovoltaic air conditioner is improved; whether to adjust the rotating speed of the heat dissipation motor is determined according to the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor, the problem of equipment failure caused by poor heat dissipation of the air conditioner outdoor unit is overcome, and the operation efficiency and stability of the photovoltaic air conditioner are improved.

[0032] Further, the photovoltaic air conditioner converts the direct current generated by the photovoltaic substrate into alternating current through the photovoltaic power generation unit, the problem that the electric energy generated by the photovoltaic substrate cannot be adapted to the electric equipment or cannot be interacted with the grid is overcome, and the universality of the electric power generated by the photovoltaic air conditioner is improved.

[0033] Further, the photovoltaic air conditioner is provided with an energy storage unit, the lithium battery can realize fast charging and discharging, and the photovoltaic inverter is adapted to the lithium battery pack, the problem of battery damage caused by too high charging voltage or too large current is overcome, and the risk of energy supply interruption is reduced.

[0034] Further, the photovoltaic air conditioner is provided with a grid interaction unit, the problem of unstable operation of the grid caused by unbalanced load of electric energy allocation is overcome through accurate measurement of the electric energy delivered from the photovoltaic substrate to the grid, and the stability of the operation of the photovoltaic air conditioner is improved.

[0035] Further, the photovoltaic air conditioner disclosed in the present application overcomes the problem of excessive storage or insufficient storage of electric energy caused by environmental temperature or weather conditions by setting a preset linear fitting degree, obtaining the ambient temperature and power generation efficiency of the photovoltaic substrate, and determining the energy storage proportion of the energy storage unit by comprehensively considering the two key factors, which may cause self-discharge loss of the energy storage device due to excessive storage, and may not meet the power demand during subsequent power peak or poor light period due to insufficient storage, thereby improving the efficiency of the collaborative operation of the photovoltaic power generation unit and the energy storage unit.

[0036] Further, the photovoltaic air conditioner disclosed in the present application overcomes the problem of unstable voltage received by the photovoltaic air conditioner caused by power peak and power equipment failure by setting a preset fluctuation amplitude, and the compensation control unit obtains the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage to determine whether to start the voltage compensation of the power grid to the air conditioner, thereby reducing the problem of frequent start-stop of the photovoltaic air conditioner, poor refrigeration or heating effect due to voltage abnormalities, and improving the safety and stability of the operation of the photovoltaic air conditioner.

[0037] Further, the photovoltaic air conditioner disclosed in the present application overcomes the problem of unstable voltage received by the photovoltaic air conditioner caused by power peak and power equipment failure by setting a preset fluctuation amplitude, and the compensation control unit obtains the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage to determine whether to start the voltage compensation of the power grid to the air conditioner, thereby reducing the problem of frequent start-stop of the photovoltaic air conditioner, poor refrigeration or heating effect due to voltage abnormalities, and improving the safety and stability of the operation of the photovoltaic air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the photovoltaic air conditioner with substrate protection function according to an embodiment of the present application;

[0039] Figure 2 FIG. 2 is a structural block diagram of the photovoltaic air conditioner with substrate protection function according to an embodiment of the present application;

[0040] Figure 3 FIG. 3 is a structural block diagram of the photovoltaic power generation unit of the photovoltaic air conditioner with substrate protection function according to an embodiment of the present application;

[0041] Figure 4 FIG. 4 is a logic flow chart of the photovoltaic air conditioner with substrate protection function according to an embodiment of the present application;

[0042] The reference signs are as follows: 1, air conditioner indoor unit; 2, first temperature sensor; 3, air conditioner outdoor unit; 4, heat dissipation fan; 5, photovoltaic substrate support; 6, second temperature sensor; 7, photovoltaic substrate. DETAILED DESCRIPTION

[0043] In order to make the objects and advantages of the present application more clear, the present application will be further described below in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present application and should not be used to limit the present application.

[0044] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not used to limit the protection scope of the present application.

[0045] Those skilled in the art can understand that the singular forms "a", "an" and "the" used herein include plural forms, unless specifically stated otherwise. It should be further understood that the phrase "comprises" used in the specification means that a feature, integer, step, operation, element / component is present, but does not exclude the presence or addition of one or more other features, integers, steps, operations, element / components. It should be understood that when we say a unit is "connected" or "coupled" to another unit, it can be directly connected or coupled to the other unit, or there can be intervening units. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling.

[0046] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , which are respectively a schematic diagram of the overall structure of a photovoltaic air conditioner with a substrate protection function, a structural block diagram, a structural block diagram of a photovoltaic power generation unit and a logic flow diagram. The photovoltaic air conditioner with a substrate protection function according to the embodiments of the present application comprises an air conditioner host, and further comprises:

[0047] a heat dissipation unit connected to the air conditioner host, used to dissipate heat generated by the operation of the air conditioner host to outdoor air, comprising a heat dissipation motor used to provide heat dissipation power and a first temperature sensor 2 connected to the heat dissipation motor and used to detect the heat dissipation temperature of the heat dissipation motor;

[0048] a photovoltaic power generation unit arranged above the heat dissipation unit, comprising a photovoltaic substrate 7 arranged above the heat dissipation motor and used to convert solar energy into electric energy, and a second temperature sensor 6 connected to the photovoltaic substrate 7 and used to detect the air temperature around the photovoltaic substrate 7;

[0049] an energy storage unit connected to the photovoltaic power generation unit, used to store the electric energy;

[0050] a grid interaction unit connected to the photovoltaic power generation unit and the energy storage unit respectively, used to determine the energy storage capacity ratio of the energy storage unit according to the air temperature around the photovoltaic substrate 7 and the power generation efficiency of the photovoltaic substrate 7;

[0051] A compensation control unit is connected with the air conditioner main unit, the heat dissipation unit, the photovoltaic power generation unit, the energy storage unit and the power grid interaction unit respectively, and whether to start the voltage compensation of the power grid to the air conditioner is determined according to the power generation efficiency of the photovoltaic substrate 7 and the fluctuation range of the photovoltaic power generation voltage, and whether to adjust the rotating speed of the heat dissipation motor is determined according to the air temperature around the photovoltaic substrate 7 and the heat dissipation temperature of the heat dissipation motor.

[0052] Specifically, the first temperature sensor 2 can be an infrared temperature sensor or a gas temperature sensor, and the preferred embodiment of the first temperature sensor is a gas temperature sensor.

[0053] Specifically, the second temperature sensor 6 can be an infrared temperature sensor or a gas temperature sensor, and the preferred embodiment is a gas temperature sensor.

[0054] Specifically, the heat dissipation temperature of the heat dissipation motor is the temperature of the high-temperature gas output by the heat dissipation motor.

[0055] In the implementation, the photovoltaic air conditioner disclosed by the application overcomes the problem of unstable power generation of the photovoltaic substrate 7 under different weather and light conditions by setting the heat dissipation unit, the photovoltaic power generation unit, the energy storage unit, the power grid interaction unit and the compensation control unit, and comprehensively determining the energy storage power proportion of the energy storage unit according to the air temperature around the photovoltaic substrate 7 and the power generation efficiency of the photovoltaic substrate 7, thereby improving the energy utilization efficiency; the photovoltaic air conditioner disclosed by the application overcomes the problem of abnormal air conditioner voltage caused by the change of photovoltaic power generation efficiency and the instability of the voltage of the power grid itself by determining whether to start the voltage compensation of the power grid to the air conditioner according to the power generation efficiency of the photovoltaic substrate 7 and the fluctuation range of the photovoltaic power generation voltage, thereby improving the safety of the photovoltaic air conditioner; the photovoltaic air conditioner disclosed by the application overcomes the problem of equipment failure caused by poor heat dissipation of the air conditioner outdoor unit by determining whether to adjust the rotating speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate 7 and the heat dissipation temperature of the heat dissipation motor, thereby improving the operation efficiency and stability of the photovoltaic air conditioner.

[0056] Specifically, the air conditioner main unit comprises:

[0057] A compressor (not shown in the figure) is used to compress the gaseous refrigerant;

[0058] A condenser (not shown in the figure) is connected with the compressor, and is used to cool the gaseous refrigerant discharged by the compressor;

[0059] An evaporator (not shown in the figure) is connected with the condenser, and is used to vaporize the gaseous refrigerant discharged by the condenser;

[0060] A heat dissipation fan 4 is connected with the condenser and the evaporator respectively, and is used to exchange heat in the heat of the outdoor air and the gaseous refrigerant in the evaporator.

[0061] Specifically, the photovoltaic power generation unit further comprises:

[0062] a photovoltaic controller (not shown in the figure) connected to the photovoltaic substrate 7, used to control the electric energy generated by the photovoltaic substrate 7;

[0063] a photovoltaic substrate support 5 connected to the photovoltaic substrate 7, used to fix the position of the photovoltaic substrate 7.

[0064] In implementation, the photovoltaic air conditioner of the present application overcomes the problem that the electric energy generated by the photovoltaic substrate 7 cannot be adapted to the electric equipment or cannot interact with the power grid by setting the photovoltaic power generation unit to convert the direct current generated by the photovoltaic substrate 7 into alternating current, thereby improving the versatility of the electric power generated by the photovoltaic air conditioner.

[0065] Specifically, the energy storage unit comprises:

[0066] a lithium battery pack (not shown in the figure) connected to the photovoltaic substrate, used to store the electric energy generated by the photovoltaic substrate 7;

[0067] an inverter connected to the lithium battery pack, used to convert the direct current of the lithium battery pack into alternating current for the air conditioner host.

[0068] In implementation, the photovoltaic air conditioner of the present application overcomes the problem of battery damage caused by excessively high charging voltage or excessively large current by setting the energy storage unit to use lithium batteries that can achieve rapid charging and discharging performance and setting the photovoltaic inverter to adapt to the lithium battery pack, thereby reducing the risk of energy supply interruption.

[0069] Specifically, the power grid interaction unit comprises:

[0070] a switch (not shown in the figure) connected to the inverter and the power supply circuit of the air conditioner host, respectively, used to control the power supply mode of the air conditioner host;

[0071] a circuit breaker (not shown in the figure) connected to the power supply circuit of the power grid and the air conditioner host, respectively, used to cut off the power supply of the photovoltaic air conditioner by the power grid when the photovoltaic air conditioner fails or the current is overloaded;

[0072] The power supply mode includes power supply of the air conditioner host by the power grid alone and cooperative power supply of the air conditioner host by the power grid and the photovoltaic power generation unit.

[0073] Those skilled in the art can understand that the type of switch is not limited as long as it can achieve control of the power supply mode of the air conditioner host, and those skilled in the art can make adaptive adjustments to the type of switch in actual application.

[0074] In the implementation, the photovoltaic air conditioner overcomes the problem of unstable grid operation caused by unbalanced power allocation load by setting a grid interaction unit and accurately measuring the power delivered to the grid by the photovoltaic substrate 7, thereby improving the stability of the photovoltaic air conditioner operation.

[0075] Specifically, the power generation efficiency of the photovoltaic substrate is the ratio of the output electric power of the photovoltaic substrate to the surface solar radiation power of the photovoltaic substrate.

[0076] In the implementation, the surface solar radiation power of the photovoltaic substrate 7 is the product of the solar radiation power density measured by a solar radiation meter and the area of the photovoltaic substrate 7.

[0077] Specifically, the solar radiation power density is the actual radiation power density measured by a solar radiation meter, with the unit of watt per square meter.

[0078] Specifically, the grid interaction unit is connected to the second temperature sensor 6, the photovoltaic substrate 7, and the energy storage unit, respectively, to obtain the air temperature around the photovoltaic substrate 7 and the power generation efficiency of the photovoltaic substrate 7, and to calculate the linear fitting degree of the power generation efficiency of the photovoltaic substrate 7 and the air temperature around the photovoltaic substrate 7 at several sampling time points.

[0079] If the linear fitting degree is greater than a preset linear fitting degree, the compensation control unit determines that the influence of the ambient temperature on the power generation efficiency of the photovoltaic substrate 7 does not meet the requirements, and adjusts the energy storage capacity proportion of the energy storage unit.

[0080] In the implementation, the linear fitting degree of the power generation efficiency of the photovoltaic substrate 7 and the air temperature around the photovoltaic substrate 7 at several sampling time points is calculated at equal time intervals.

[0081] Specifically, the linear fitting degree is a conventional technical means known to those skilled in the art, and therefore the calculation process of the linear fitting degree will not be described here.

[0082] Optionally, the preset linear fitting degree can have a value range of [1.3, 1.6];

[0083] Preferably, the preferred embodiment of the preset linear fitting degree is 1.5.

[0084] In a specific embodiment, the linear fitting degree is 1.7, greater than the preset linear fitting degree, the compensation control unit determines that the degree of influence of the ambient temperature on the power generation efficiency of the photovoltaic substrate 7 does not meet the requirements, and the energy storage capacity ratio of the energy storage unit is increased by 2% for each 0.1 increase in the linear fitting degree greater than the preset linear fitting degree. When the current energy storage capacity ratio is 60%, the increased energy storage capacity ratio is 60+(1.7-1.5) / 0.1*2=64%.

[0085] Specifically, the linear fitting degree of the power generation efficiency of the photovoltaic substrate 7 and the ambient air temperature around the photovoltaic substrate 7 is the degree of influence of the ambient air temperature around the photovoltaic substrate 7 on the power generation efficiency of the photovoltaic substrate 7 per unit time. The method for calculating the linear fitting degree of the power generation efficiency of the photovoltaic substrate 7 and the ambient air temperature around the photovoltaic substrate 7 is a known prior art to those skilled in the art, and therefore the calculation method of the linear fitting degree will not be described here.

[0086] In implementation, the photovoltaic air conditioner of the present application determines the energy storage capacity ratio of the energy storage unit by setting a preset linear fitting degree, obtaining the ambient temperature and power generation efficiency of the photovoltaic substrate 7, and comprehensively considering these two key factors, thereby overcoming the problem of excessive storage or insufficient storage of electrical energy caused by ambient temperature or weather conditions. Excessive storage may cause self-discharge loss of the energy storage device, and insufficient storage may not meet the electricity demand during subsequent peak electricity consumption or poor light periods, thereby improving the efficiency of the cooperative operation of the entire photovoltaic power generation unit and the energy storage unit.

[0087] Specifically, the energy storage capacity ratio of the energy storage unit is the ratio of the current storage capacity of the lithium battery pack to the maximum storage capacity of the lithium battery pack.

[0088] Specifically, the fluctuation range of the photovoltaic power generation voltage is the difference between the maximum power generation voltage and the minimum power generation voltage of the photovoltaic substrate within a plurality of sampling periods.

[0089] Specifically, the compensation control unit is connected to the photovoltaic substrate 7, the energy storage unit, and the grid interaction unit, and is also used to obtain the fluctuation range of the photovoltaic power generation voltage and the power generation efficiency of the photovoltaic substrate 7.

[0090] Under the condition that the ambient air temperature around the photovoltaic substrate 7 is within the preset ambient temperature range and the power generation efficiency of the photovoltaic substrate 7 is less than the preset power generation efficiency, if the fluctuation range of the photovoltaic power generation voltage is greater than the preset fluctuation range, the compensation control unit determines that the stability of the grid does not meet the requirements, and starts the grid to compensate the voltage of the air conditioner.

[0091] The compensated voltage of the air conditioner is determined by the difference between the fluctuation range of the photovoltaic power generation voltage and the preset fluctuation range.

[0092] Optionally, the preset ambient temperature range can be [20℃, 27℃], the preset power generation efficiency can be [17%, 25%], and the preset fluctuation range can be [1V, 4V].

[0093] Preferably, the preferred embodiment of the preset ambient temperature range is [23℃, 25℃], the preferred embodiment of the preset power generation efficiency is 20%, and the preferred embodiment of the preset fluctuation range is 2V.

[0094] In a specific embodiment, the air temperature around the photovoltaic substrate 7 is 24℃, the power generation efficiency of the photovoltaic substrate 7 is 20%, and the fluctuation range of the photovoltaic power generation voltage is 3V, which is greater than the preset fluctuation range. The voltage compensation of the power grid to the air conditioner is started, and the voltage compensation of the power grid to the air conditioner is increased by 0.6V for each 1V that the fluctuation range of the photovoltaic power generation voltage is greater than the preset fluctuation range. The current voltage compensation is 2V, and the increased voltage compensation is 2+(3-2)×0.6=2.6V.

[0095] In implementation, the photovoltaic air conditioner described in the present application overcomes the problem of unstable voltage received by the photovoltaic air conditioner due to power peak and power equipment failure by setting the preset fluctuation range, and the compensation control unit acquires the power generation efficiency of the photovoltaic substrate 7 and the fluctuation range of the photovoltaic power generation voltage to determine whether to start the voltage compensation of the power grid to the air conditioner. The problem of frequent start-stop of the photovoltaic air conditioner, poor refrigeration or heating effect due to voltage abnormalities is reduced, and the safety and stability of the operation of the photovoltaic air conditioner are improved.

[0096] Specifically, the compensation control unit is connected to the photovoltaic substrate 7, the first temperature sensor 2, and the heat dissipation unit, and is also used to acquire the heat dissipation temperature of the heat dissipation motor and calculate the difference between the decrease of the heat dissipation temperature of the heat dissipation motor and the increase of the air temperature around the photovoltaic substrate 7,

[0097] If the difference is less than a preset difference, the compensation control unit determines that the influence of the heat dissipation of the heat dissipation motor on the air temperature around the photovoltaic substrate 7 exceeds the allowed range, and increases the speed of the heat dissipation motor.

[0098] Optionally, the preset difference can be [5℃, 8℃];

[0099] Preferably, the preferred embodiment of the preset difference is 6℃.

[0100] In a specific embodiment, the difference between the decrease of the heat dissipation temperature of the air conditioner outdoor unit and the increase of the air temperature around the photovoltaic substrate 7 is 5°C, which is less than the preset difference value. For each 1°C less than the preset difference value, the rotation speed of the heat dissipation motor of the air conditioner outdoor unit is increased by 10% than the current rotation speed of the heat dissipation motor of the air conditioner outdoor unit. When the current rotation speed of the heat dissipation motor of the air conditioner outdoor unit is 2000 r / min, the increased rotation speed of the heat dissipation motor of the air conditioner outdoor unit is 2000 + 2000 × [(6-5)] × 10% = 2200 r / min.

[0101] In the implementation, the photovoltaic air conditioner described in the present application sets a preset difference value. The control unit determines whether to adjust the rotation speed of the heat dissipation motor by obtaining the air temperature around the photovoltaic substrate 7 and the heat dissipation temperature of the heat dissipation motor, which overcomes the problem that the heat dissipation temperature of the air conditioner outdoor unit increases due to long-time operation of the air conditioner, which leads to the increase of the air temperature around the photovoltaic substrate 7, and further leads to the decrease of the power generation efficiency of the photovoltaic substrate 7. The system failure risk caused by the mutual influence between devices is reduced.

[0102] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings. However, those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application. The technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A photovoltaic air conditioner with a substrate protection function, comprising an air conditioner main machine, characterized in that, Also comprising: a heat dissipation unit connected with the air conditioner host, for dissipating heat generated by the air conditioner host operation to outdoor air, including a heat dissipation motor for providing heat dissipation power and a first temperature sensor connected with the heat dissipation motor for detecting the heat dissipation temperature of the heat dissipation motor; a photovoltaic power generation unit arranged above the heat dissipation unit, including a photovoltaic substrate arranged above the heat dissipation motor for converting solar energy into electrical energy and a second temperature sensor connected with the photovoltaic substrate for detecting the air temperature around the photovoltaic substrate; an energy storage unit connected with the photovoltaic power generation unit for storing the electrical energy; a grid interaction unit connected with the photovoltaic power generation unit and the energy storage unit respectively, for determining the energy storage proportion of the energy storage unit according to the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate; a compensation control unit connected with the air conditioner host, the heat dissipation unit, the photovoltaic power generation unit, the energy storage unit and the grid interaction unit respectively, for determining whether to start the voltage compensation of the grid to the air conditioner according to the power generation efficiency of the photovoltaic substrate and the fluctuation amplitude of the photovoltaic power generation voltage, and determining whether to adjust the rotating speed of the heat dissipation motor according to the air temperature around the photovoltaic substrate and the heat dissipation temperature of the heat dissipation motor; the power generation efficiency of the photovoltaic substrate is the ratio of the output electrical power of the photovoltaic substrate to the surface solar radiation power of the photovoltaic substrate; the grid interaction unit is connected with the second temperature sensor, the photovoltaic substrate and the energy storage unit respectively, for obtaining the air temperature around the photovoltaic substrate and the power generation efficiency of the photovoltaic substrate, and calculating the linear fitting degree of the power generation efficiency of the photovoltaic substrate and the air temperature around the photovoltaic substrate at several sampling time points; if the linear fitting degree is greater than a preset linear fitting degree, the compensation control unit determines that the influence degree of the ambient temperature on the power generation efficiency of the photovoltaic substrate does not meet the requirements, and adjusts the energy storage proportion of the energy storage unit; the energy storage proportion of the energy storage unit is the ratio of the current storage capacity of the lithium battery pack to the maximum storage capacity of the lithium battery pack; the compensation control unit is connected with the photovoltaic substrate, the energy storage unit and the grid interaction unit respectively, and is also used to obtain the fluctuation amplitude of the photovoltaic power generation voltage and the power generation efficiency of the photovoltaic substrate; under the condition that the air temperature around the photovoltaic substrate is within a preset ambient temperature range and the power generation efficiency of the photovoltaic substrate is less than a preset power generation efficiency, if the fluctuation amplitude of the photovoltaic power generation voltage is greater than a preset fluctuation amplitude, the compensation control unit determines that the stability of the grid does not meet the requirements, and starts the voltage compensation of the grid to the air conditioner; wherein the compensated voltage of the air conditioner is determined by the difference between the fluctuation amplitude of the photovoltaic power generation voltage and the preset fluctuation amplitude; the compensation control unit is connected with the photovoltaic substrate, the first temperature sensor and the heat dissipation unit respectively, and is also used to obtain the heat dissipation temperature of the heat dissipation motor, and calculate the difference between the decreasing amount of the heat dissipation temperature of the heat dissipation motor and the increasing amount of the air temperature around the photovoltaic substrate. If the difference is less than a preset difference, the compensation control unit determines that the influence of the heat dissipation motor on the air temperature around the photovoltaic substrate exceeds the allowable range, and increases the rotation speed of the heat dissipation motor.

2. The photovoltaic air conditioner with substrate protection function according to claim 1, characterized in that, The photovoltaic power generation unit further comprises: a photovoltaic controller connected to the photovoltaic substrate for controlling the electric energy generated by the photovoltaic substrate 7; a photovoltaic substrate support connected to the photovoltaic substrate for fixing the position of the photovoltaic substrate.

3. The photovoltaic air conditioner with substrate protection function according to claim 2, characterized in that, The energy storage unit comprises: a lithium battery pack connected to the photovoltaic substrate for storing the electric energy generated by the photovoltaic substrate; an inverter connected to the lithium battery pack for converting the direct current of the lithium battery pack into alternating current for the air conditioner host.

4. The photovoltaic air conditioner with substrate protection function according to claim 3, characterized in that, The grid interaction unit comprises: a switch connected to the inverter and the power supply line of the air conditioner host for controlling the power supply mode of the air conditioner host; a circuit breaker connected to the power supply line of the grid and the air conditioner host for cutting off the power supply of the grid to the photovoltaic air conditioner when the photovoltaic air conditioner fails or the current is overloaded; wherein the power supply mode comprises the power supply of the grid to the air conditioner host alone and the cooperative power supply of the grid and the photovoltaic power generation unit to the air conditioner host.

5. The photovoltaic air conditioner having a substrate protection function according to claim 4, characterized in that, The fluctuation range of the photovoltaic power generation voltage is the difference between the maximum power generation voltage and the minimum power generation voltage of the photovoltaic substrate within a plurality of sampling periods.

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