Cooling system, photovoltaic system and control method

Abstract

The present disclosure provides a cooling system, a photovoltaic system and a control method. In the cooling system of the present disclosure, the first refrigerant system can be used to cool down the inverter device of the photovoltaic power generation system, which can reduce the damage of high temperature to the internal components of the inverter device, thereby extending the service life of the inverter device, and can also ensure the reliability of the inverter device and reduce maintenance costs. In addition, the present disclosure can also use the second refrigerant system to cool down the photovoltaic power generation device of the photovoltaic power generation system, reduce the impact of temperature on the photoelectric conversion efficiency, improve the photovoltaic power generation efficiency, and can also reduce the damage of high temperature to the internal components of the photovoltaic power generation device, extend the service life of the photovoltaic power generation device, further improve the reliability of the photovoltaic power generation system, improve the stability and performance of the system, and reduce maintenance costs.

Description

Technical Field

[0001] The present disclosure relates to the technical field of photovoltaic power generation, and in particular to a cooling system, a photovoltaic system and a control method. Background Art

[0002] Photovoltaic power generation technology is widely used and is also the choice of many users. However, heat is generated during the photovoltaic power generation process, which affects its efficiency and life. Many documents point out that the efficiency of photovoltaic power generation is directly related to the temperature of the photovoltaic power generation device (such as photovoltaic panels). For every 1°C increase in temperature, the photoelectric conversion efficiency decreases by 0.5%. In addition, photovoltaic power generation generally requires an inverter device. During the use of the inverter device, the internal components will generate heat. If the internal temperature of the inverter device is high for a long time, it will reduce the service life and reliability of the inverter device, which will also affect the life of the photovoltaic power generation system. Summary of the invention

[0003] In view of this, in order to solve the technical problem in the prior art that high temperature affects the efficiency and life of photovoltaic power generation, the present disclosure provides a cooling system, a photovoltaic system and a control method.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a cooling system for a photovoltaic power generation system, the photovoltaic power generation system comprising a photovoltaic power generation device and an inverter device, the cooling system comprising a first refrigerant system and a second refrigerant system;

[0005] The first refrigerant system includes a first refrigeration pipeline and a first cooling branch which are interconnected; the first refrigeration pipeline is used to provide a low-temperature first refrigerant to the first refrigerant system; the first cooling branch is used to cool the inverter device by the first refrigerant transported by the first refrigeration pipeline;

[0006] The second refrigerant system includes a second refrigeration pipeline and a second cooling branch, the second refrigeration pipeline is connected to the first refrigeration pipeline; the second refrigeration pipeline is used to cool the second refrigerant in the second cooling branch by the first refrigerant transported by the first refrigeration pipeline; the second cooling branch is used to cool the photovoltaic power generation device by the second refrigerant.

[0007] In an optional embodiment, the inverter device includes an inverter module and a rectifier module, the first cooling branch includes a first control valve and a first cooling device for cooling the inverter device, and the first control valve is located at an upstream side of the first cooling device;

[0008] The refrigerant inlet of the first cooling device is arranged close to the rectifier module, and the refrigerant outlet of the first cooling device is arranged close to the inverter module, so as to realize cooling for the inverter device.

[0009] In an alternative embodiment,

[0010] The first cooling branch includes a first stop valve, and the first stop valve is located between the first control valve and the first cooling device;

[0011] and / or,

[0012] The first cooling branch includes a second stop valve, and the second stop valve is located at the downstream side of the first cooling device.

[0013] In an optional embodiment, the second cooling branch includes a cooling tower, the second refrigeration pipeline includes a second control valve and a second cooling device, the second control valve is located on the upstream side of the second cooling device, and the second cooling device is used to cool the second refrigerant in the cooling tower.

[0014] In an alternative embodiment,

[0015] The second refrigeration pipeline includes a third stop valve, and the third stop valve is located between the second control valve and the second temperature reduction device;

[0016] and / or,

[0017] The second refrigeration pipeline includes a fourth stop valve, and the fourth stop valve is located at the downstream side of the second temperature reduction device.

[0018] In an optional embodiment, the cooling system includes an air cooling device, and the air cooling device is used to cool the second refrigerant in the cooling tower.

[0019] In an optional embodiment, the photovoltaic power generation system includes an inductive reactance device, and the first refrigerant system includes a third cooling branch, the third cooling branch is connected to the first refrigeration pipeline, and the third cooling branch is used to cool the inductive reactance device by using the first refrigerant transported through the first refrigeration pipeline.

[0020] In an optional embodiment, the third cooling branch includes a capillary tube and an evaporator, the capillary tube is located on the upstream side of the evaporator, and the evaporator is used to cool the reactor device.

[0021] In an alternative embodiment,

[0022] The third cooling branch includes a fifth stop valve, and the fifth stop valve is located at the upstream side of the capillary tube;

[0023] and / or,

[0024] The third temperature-lowering branch includes a sixth stop valve, and the sixth stop valve is located at a downstream side of the evaporator.

[0025] According to a second aspect of an embodiment of the present disclosure, a photovoltaic system is provided, which includes a photovoltaic power generation system, the photovoltaic power generation system includes a photovoltaic power generation device, an inverter device and an inductor device, and the photovoltaic system also includes a cooling system as described in any one of the first aspects.

[0026] In an optional implementation, the inverter device is electrically connected to an electrical device of the cooling system to supply power to the electrical device of the cooling system.

[0027] In an optional embodiment, the electrical device of the cooling system includes at least a compressor.

[0028] According to a third aspect of an embodiment of the present disclosure, a control method for a photovoltaic system is provided, wherein the photovoltaic system is the photovoltaic system as described in any one of the second aspects, wherein the photovoltaic system includes a photovoltaic power generation system and a cooling system, wherein the photovoltaic power generation system includes a photovoltaic power generation device and an inverter device, and wherein the cooling system includes a first refrigerant system and a second refrigerant system; wherein the first refrigerant system includes a first refrigeration pipeline and a first cooling branch that are interconnected, and wherein the second refrigerant system includes a second refrigeration pipeline and a second cooling branch;

[0029] The control method comprises:

[0030] When the photovoltaic power generation device is in operation, controlling the first cooling branch to cool the inverter device through the first refrigerant transported by the first refrigeration pipeline;

[0031] When the power of the photovoltaic power generation device is reduced to within a set percentage before a set time, the second refrigeration pipeline is controlled to cool the second refrigerant in the second cooling branch by transporting the first refrigerant through the first refrigeration pipeline.

[0032] In an optional embodiment, the first refrigeration pipeline includes a compressor, and the first cooling medium transported by the first cooling branch through the first refrigeration pipeline is controlled to cool the inverter device, including:

[0033] Monitoring the temperature of the photovoltaic power generation device;

[0034] Based on the temperature and temperature change rate of the photovoltaic power generation device, the operating frequency of the compressor of the first refrigeration pipeline is controlled to control the degree to which the first cooling branch cools the inverter device.

[0035] In an optional embodiment, the first refrigeration pipeline includes a compressor, and when the power of the photovoltaic power generation device is reduced to within a set percentage before a set time, the control method includes:

[0036] The compressor is controlled to operate at a minimum frequency; wherein the cooling capacity of the compressor when operating at the minimum frequency is greater than the cooling capacity required by the inverter device.

[0037] In an optional embodiment, the photovoltaic power generation system includes a reactor device, the first refrigerant system includes a third cooling branch, and the control method includes:

[0038] When the reactor device is controlled to be in operation so as to transmit at least part of the electricity generated by the photovoltaic power generation device to the power supply network, the third cooling branch is controlled to cool the reactor device using the first refrigerant transported by the first refrigeration pipeline.

[0039] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: In the cooling system of the present disclosure, the first refrigerant system can be used to cool down the inverter device of the photovoltaic power generation system, which can reduce the damage of high temperature to the internal components of the inverter device, thereby extending the service life of the inverter device, and can also ensure the reliability of the inverter device and reduce maintenance costs. In addition, the present disclosure can also cool down the photovoltaic power generation device (such as a photovoltaic panel) of the photovoltaic power generation system through the second refrigerant system, reduce the impact of temperature on the photoelectric conversion efficiency, improve the photovoltaic power generation efficiency, and reduce the damage of high temperature to the internal components of the photovoltaic power generation device, extend the service life of the photovoltaic power generation device, further improve the reliability of the photovoltaic power generation system, improve the stability and performance of the system, and reduce maintenance costs. The cooling system of the photovoltaic power generation system disclosed in the present disclosure has significant innovation and practicality, and can provide strong support for the development of photovoltaic power generation technology.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0044] Figure 1 The figure is a schematic diagram showing the cooling principle of a photovoltaic system according to an exemplary embodiment.

[0045] Figure 2 The figure is a schematic diagram showing the power generation principle of a photovoltaic system according to an exemplary embodiment.

[0046] Reference numerals:

[0047] 11. Photovoltaic power generation device; 12. Inverter device; 121. Inverter module; 122. Rectifier module; 13. Reactor device;

[0048] 21. first refrigeration circuit; 211. gas-liquid separator; 212. compressor; 213. condenser; 214. high-pressure sensor; 215. valve; 22. first cooling branch; 221. first control valve; 222. first cooling device; 223. first stop valve; 224. second stop valve; 23. second refrigeration circuit; 231. second control valve; 232. third stop valve; 233. fourth stop valve; 24. second cooling branch; 241. cooling tower; 25. third cooling branch; 251. capillary tube; 252. evaporator; 253. fifth stop valve; 254. sixth stop valve. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0050] The disclosure below provides many different embodiments or examples to implement different schemes of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0051] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0052] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0053] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0054] In order to solve the technical problem in the prior art that high temperature affects the efficiency and life of photovoltaic power generation, the present disclosure provides a cooling system, a photovoltaic system and a control method.

[0055] Among them, in the cooling system of the present disclosure, the first refrigerant system can be used to cool down the inverter device of the photovoltaic power generation system, which can reduce the damage of high temperature to the internal components of the inverter device, thereby extending the service life of the inverter device, and can also ensure the reliability of the inverter device and reduce maintenance costs. In addition, the present disclosure can also cool down the photovoltaic power generation device (such as a photovoltaic panel) of the photovoltaic power generation system through the second refrigerant system, reduce the impact of temperature on the photoelectric conversion efficiency, improve the photovoltaic power generation efficiency, and can also reduce the damage of high temperature to the internal components of the photovoltaic power generation device, extend the service life of the photovoltaic power generation device, further improve the reliability of the photovoltaic power generation system, improve the stability and performance of the system, and reduce maintenance costs. The cooling system of the photovoltaic power generation system disclosed in the present disclosure has significant innovation and practicality, and can provide strong support for the development of photovoltaic power generation technology.

[0056] In an exemplary embodiment, reference Figure 1 and Figure 2 As shown, a photovoltaic system and its cooling system are provided. The photovoltaic system may include a photovoltaic power generation system, the photovoltaic power generation system includes a photovoltaic power generation device 11 and an inverter device 12, and the cooling system includes a first refrigerant system and a second refrigerant system. The cooling system is used to cool down the devices in the photovoltaic power generation system.

[0057] The first refrigerant system may include a first refrigeration pipeline 21 and a first cooling branch 22 that are interconnected. The first refrigeration pipeline 21 is used to provide a low-temperature first refrigerant for the first refrigerant system. The first cooling branch 22 is used to cool the inverter device 12 with the first refrigerant transported by the first refrigeration pipeline 21.

[0058] The first refrigeration pipeline 21 may include a refrigeration source, which is responsible for providing a low-temperature first refrigerant for the entire first refrigerant system. The refrigeration source may be a compression refrigeration device (such as a compressor 212), or a liquid nitrogen cooling device, etc., without limitation, as long as it can generate a sufficiently low-temperature refrigerant to meet the cooling requirements of the inverter device 12.

[0059] The low-temperature first refrigerant generated by the refrigeration source flows in the first refrigeration pipeline 21. The first refrigeration pipeline 21 can be wrapped with an efficient heat-insulating material to reduce the heat loss of the refrigerant during transportation. The first refrigeration pipeline 21 can be reasonably designed and arranged according to the layout and installation position of the inverter device 12 to ensure that the refrigerant can be smoothly transported to the first cooling branch 22.

[0060] The first cooling branch 22 may at least partially be in close contact with the inverter device 12, and cool the inverter device 12 by heat exchange. The pipe of the first cooling branch 22 may be made of a material with good thermal conductivity to improve heat exchange efficiency.

[0061] After the first refrigerant flows from the first refrigeration pipeline 21 into the first cooling branch 22, it absorbs the heat generated by the inverter device 12 and the temperature gradually increases. In order to enhance the cooling effect, a plurality of heat sinks close to the inverter device 12 can be provided in the first cooling branch 22 to increase the heat exchange area with the air and accelerate the heat dissipation speed of the refrigerant.

[0062] Among them, a temperature sensor can be set in the first refrigerant system to monitor the temperature of the inverter device 12 and the temperature of the first refrigerant in real time. And according to the feedback information of the temperature sensor, the cooling capacity of the cooling source or the flow rate of the first refrigerant in the pipeline is adjusted to ensure that the temperature of the inverter device 12 is kept within a safe range. For example, when the temperature of the inverter device 12 rises, the cooling capacity of the cooling source is increased or the flow rate of the first refrigerant is increased to enhance the cooling effect; when the temperature drops to a certain level, the cooling capacity is appropriately reduced or the refrigerant flow rate is reduced to save energy.

[0063] In some embodiments,

[0064] The first refrigeration pipeline 21 is mainly composed of a compressor 212, a gas-liquid separator 211, a condenser 213, a high-pressure sensor 214 and a valve 215. The first cooling branch 22 is in close contact with the inverter device 12, and is used to cool the inverter device 12 through the first refrigerant. The compressor 212, as a core power component, is responsible for compressing the first refrigerant and increasing the pressure and temperature of the refrigerant. The gas-liquid separator 211 is used to separate the gaseous and liquid components in the first refrigerant to prevent the liquid refrigerant from entering the compressor 212 and causing damage. The condenser 213 cools the compressed high-temperature and high-pressure refrigerant into a liquid state by exchanging heat with the outside world. The high-pressure sensor 214 can be installed in the pipeline on the downstream side of the compressor 212 to detect the pressure in the pipeline in real time. The valve 215 is used to control the flow of the first refrigerant.

[0065] In this embodiment, the high-temperature first refrigerant flowing out of the first cooling branch 22 first enters the gas-liquid separator 211 for gas-liquid separation, and the gaseous refrigerant is transported to the compressor 212. The compressor 212 compresses the gaseous refrigerant to increase its pressure and temperature. The high-pressure sensor 214 monitors the pressure in the downstream pipeline of the compressor 212 in real time. When the pressure exceeds the set value, the pressure can be adjusted by adjusting the operating parameters of the compressor 212 or controlling the opening of the valve 215. The high-temperature and high-pressure gaseous refrigerant then enters the condenser 213, where it exchanges heat with the external cooling medium, dissipates heat and cools down, and condenses into a liquid state. After the liquid refrigerant is regulated by the valve 215, it enters the refrigerant inlet of the first cooling branch 22. After the low-temperature liquid first refrigerant enters the first cooling branch 22 from the condenser 213, it exchanges heat with the inverter device 12, absorbs the heat generated by the inverter device 12, and the temperature gradually increases. After the heat exchange, the high-temperature first refrigerant flows out from the refrigerant outlet of the first cooling branch 22 and enters the gas-liquid separator 211 again to start the next cycle.

[0066] It should be noted that, in addition to the above-mentioned structure, the first refrigerant system may also be configured as other structures according to actual needs, and there is no limitation to this.

[0067] The inverter device 12 may include an inverter module 121 and a rectifier module 122. The first cooling branch 22 may include a first control valve 221 and a first cooling device 222 for cooling the inverter device 12. The first control valve 221 is located at the upstream side of the first cooling device 222 and is used to control the flow rate of the first refrigerant into the first cooling device 222.

[0068] Among them, the first control valve 221 can be an electronic expansion valve, which can accurately control the flow rate and direction of the first refrigerant according to the heating characteristics and temperature requirements of different modules to ensure that each module can be effectively cooled.

[0069] Among them, the first cooling device 222 can be arranged near the inverter device 12. The refrigerant inlet of the first cooling device 222 is arranged near the rectifier module 122, and the refrigerant outlet of the first cooling device 222 is arranged near the inverter module 121, so as to realize cooling of the inverter device 12. The first cooling device 222 can realize targeted cooling of the rectifier module 122 and the inverter module 121 in the inverter device 12, thereby improving the cooling effect.

[0070] In this embodiment, when the inverter device 12 needs to be cooled, the first control valve 221 is opened, and the first refrigerant flows from the first refrigeration pipeline 21 into the first cooling branch 22. The first refrigerant first enters the refrigerant inlet of the first cooling device 222. Since the refrigerant inlet is close to the rectifier module 122, the first refrigerant can quickly absorb the heat generated by the rectifier module 122. The first refrigerant flows in the first cooling device 222, continues to absorb the heat generated by the inverter module 121, and then flows out from the refrigerant outlet. The outflowing first refrigerant carries the heat generated by the inverter device 12 and returns to the first refrigeration pipeline 21 for circulation cooling.

[0071] Among them, through the cooperation of the first control valve 221 and the first cooling device 222, the flow rate of the first refrigerant can be accurately controlled, thereby providing stable and efficient cooling for the inverter device 12. The first cooling device 222 can adopt efficient heat exchange materials and structural design, which can quickly absorb the heat generated by the inverter device 12 and improve the cooling efficiency.

[0072] The first cooling branch 22 may include a first stop valve 223, which is located between the first control valve 221 and the first cooling device 222, and can further control the flow of the refrigerant and cut off the refrigerant supply when necessary. It should be noted that the first stop valve 223 is adjusted according to the actual situation to ensure that the refrigerant enters the first cooling device 222 with a suitable flow rate and pressure. If an abnormal situation occurs, the first stop valve 223 can be quickly closed to cut off the refrigerant supply and protect the first cooling device 222 and the inverter device 12.

[0073] The first cooling branch 22 may include a second stop valve 224, which is located at the downstream side of the first cooling device 222 and can be used to control the flow of the refrigerant flowing out of the first cooling device 222 or to cut off the outflow of the refrigerant when necessary. It should be noted that the first refrigerant after heat exchange flows out from the refrigerant outlet of the first cooling device 222, and at this time, the second stop valve 224 can adjust the outflow flow of the refrigerant according to the temperature requirement of the inverter device 12. If it is necessary to stop cooling or perform maintenance, the second stop valve 224 can be closed.

[0074] In this embodiment, the combination of the first control valve 221, the first stop valve 223 and the second stop valve 224 can realize accurate control of the first refrigerant in the first cooling branch 22. The flow rate and flow direction of the refrigerant can be flexibly adjusted according to the actual temperature requirement of the inverter device 12 to improve the pertinence and stability of the cooling effect. In the event of a fault or abnormal situation, the refrigerant supply can be quickly cut off to protect the inverter device 12 and the first cooling device 222, thereby improving the safety and reliability of the system.

[0075] The second refrigerant system may include a second refrigerant pipeline 23 and a second cooling branch 24, and the second refrigerant pipeline 23 is connected to the first refrigerant pipeline 21. The second refrigerant pipeline 23 is used to cool the second refrigerant in the second cooling branch 24 by the first refrigerant transported by the first refrigerant pipeline 21. The second cooling branch 24 is used to cool the photovoltaic power generation device 11 by the second refrigerant.

[0076] For example, the second refrigerant system is composed of a second refrigeration pipeline 23 and a second cooling branch 24. The second refrigeration pipeline 23 is connected to the first refrigeration pipeline 21 and receives the first refrigerant from the first refrigeration pipeline 21. The second cooling branch 24 is in close contact with the photovoltaic power generation device 11 and is responsible for cooling the photovoltaic power generation device 11 through the second refrigerant. The low-temperature first refrigerant in the first refrigeration pipeline 21 flows into the second refrigeration pipeline 23. In the second refrigeration pipeline 23, the first refrigerant exchanges heat with the second refrigerant in the second cooling branch 24. The first refrigerant absorbs the heat of the second refrigerant during the heat exchange process, and the temperature gradually increases. The first refrigerant after heating continues to circulate in the first refrigeration pipeline 21, or is further cooled as needed. After heat exchange with the first refrigerant, the temperature of the second refrigerant in the second cooling branch 24 decreases. The low-temperature second refrigerant flows in the second cooling branch 24 and exchanges heat with the photovoltaic power generation device 11. The second refrigerant absorbs the heat generated by the photovoltaic power generation device 11, and the temperature gradually increases. After the heat exchange, the second refrigerant returns to the second refrigeration pipeline 23 again, and continues to exchange heat with the first refrigerant to achieve cyclic cooling.

[0077] Among them, the second cooling branch 24 may include a cooling tower 241, and the second refrigeration branch includes a second control valve 231 (for example, an electronic expansion valve) and a second cooling device. The second refrigeration pipeline 23 is connected to the first refrigeration pipeline 21, and is responsible for conveying the first refrigerant to provide a cold source for the second cooling device. The second control valve 231 may be located on the upstream side of the second cooling device, and is used to control the flow rate of the first refrigerant flowing into the second cooling device. The second cooling device can perform heat exchange with the second refrigerant in the cooling tower 241 to cool the second refrigerant. The cooling tower 241 can be used to accommodate the second refrigerant to facilitate subsequent cooling of the photovoltaic power generation device 11.

[0078] In this embodiment, the low-temperature first refrigerant in the first refrigeration pipeline 21 flows into the second refrigeration pipeline 23. When the second refrigerant needs to be cooled, or when the cooling capacity generated by the first refrigeration pipeline 21 is too much, the second control valve 231 can be opened to allow the first refrigerant to enter the second cooling device. In the second cooling device, the first refrigerant exchanges heat with the second refrigerant in the cooling tower 241. The first refrigerant absorbs the heat of the second refrigerant, the temperature gradually increases, and then returns to the first refrigeration pipeline 21 to continue circulating or undergo further cooling treatment.

[0079] The second refrigerant after cooling is transmitted to the location of the photovoltaic power generation device 11 through the pipeline in the first cooling branch 22. During the transmission process, the pipeline is wrapped with a heat-insulating material to reduce heat loss. The second refrigerant reaching the location of the photovoltaic power generation device 11 exchanges heat with the photovoltaic power generation device 11, absorbs the heat generated by the photovoltaic power generation device 11, and the temperature gradually increases. The heated second refrigerant then flows back to the cooling tower 241 through the pipeline and performs a cooling cycle again.

[0080] In this embodiment, a stable cooling effect is provided for the photovoltaic power generation device 11 through the synergistic effect of the second cooling device and the cooling tower 241. The second refrigerant after cooling is transmitted to the location of the photovoltaic power generation device 11, which can cool it more directly and improve the cooling efficiency. In addition, this embodiment uses the first refrigerant to cool the second refrigerant, and then the second refrigerant cools the photovoltaic power generation device 11, realizing graded cooling, ensuring that the photovoltaic power generation device 11 operates at a suitable temperature, and improving power generation efficiency and stability. At the same time, reasonable control of the second control valve 231 can achieve efficient use of energy and avoid unnecessary waste.

[0081] The cooling system may include an air cooling device (e.g., a fan, not shown in the figure), which is used to cool the second refrigerant in the cooling tower 241. When the temperature of the second refrigerant in the cooling tower 241 is high, the air cooling device may be started. The air cooling device starts to operate, accelerating the flow of air around the cooling tower 241. The flowing air exchanges heat with the second refrigerant in the cooling tower 241, taking away the heat in the second refrigerant, thereby reducing the temperature of the second refrigerant.

[0082] When the air cooling device includes a fan, the speed of the fan can be adjusted according to the temperature of the second refrigerant. When the temperature of the second refrigerant is high, the speed of the fan is increased to enhance the cooling effect; when the temperature drops to a certain level, the speed of the fan is reduced to save energy.

[0083] The introduction of the air cooling device provides an additional cooling means for the second refrigerant in the cooling tower 241, and combined with the heat exchange function of the cooling tower 241 itself, significantly improves the cooling efficiency of the second refrigerant. It can better meet the cooling needs of the photovoltaic power generation system in a high temperature environment and ensure that the photovoltaic power generation device 11 and the inverter device 12 are always maintained at a suitable operating temperature.

[0084] The second refrigeration pipeline 23 may include a third stop valve 232, and the third stop valve 232 is located between the second control valve 231 and the second cooling device. The second control valve 231 can be used to preliminarily control the flow of the first refrigerant into the second cooling device. The third stop valve 232 plays a role in further controlling and regulating the flow of the refrigerant.

[0085] The second refrigeration pipeline 23 includes a fourth stop valve 233, which is located at the downstream side of the second cooling device. The fourth stop valve 233 can be used to control the flow of the refrigerant flowing out of the second cooling device or to cut off the outflow of the refrigerant when necessary.

[0086] It should be noted that the provision of the third stop valve 232 and the fourth stop valve 233 makes it easy to cut off the flow of refrigerant during maintenance and overhaul, facilitating maintenance operations on the second cooling device and the second refrigeration pipeline 23, thereby improving the maintainability and availability of the system.

[0087] The photovoltaic power generation system may further include a reactor 13, and the first refrigerant system may include a third cooling branch 25, which is connected to the first refrigeration pipeline 21. The third cooling branch 25 is used to cool the reactor 13 by the first refrigerant transported by the first refrigeration pipeline 21.

[0088] In this embodiment, when the reactor device 13 needs to be cooled, a portion of the low-temperature first refrigerant in the first refrigeration circuit 21 can be diverted into the third cooling branch 25. The third cooling branch 25 can be in close contact with the reactor device 13 to cool the reactor device 13 by heat exchange. The first refrigerant absorbs the heat generated by the reactor device 13 in the third cooling branch 25, and the temperature gradually increases. The heated first refrigerant flows back to the first refrigeration circuit 21 to continue to participate in the circulation or undergo further cooling treatment. By setting the third cooling branch 25, the reactor device 13 in the photovoltaic power generation system is cooled, so that each key component of the entire photovoltaic power generation system can be effectively cooled, thereby improving the stability and reliability of the system. Equipment failure and performance degradation caused by overheating of the reactor device 13 are avoided, and the service life of the reactor device 13 is extended.

[0089] Among them, the third cooling branch 25 may include a capillary tube 251 and an evaporator 252. The capillary tube 251 may be located on the upstream side of the evaporator 252, and is used to throttle and reduce the pressure of the first refrigerant transported by the first refrigeration pipeline 21. The evaporator 252 may be in close contact with the reactor device 13, and cool the reactor device 13 through heat exchange. After the low-temperature first refrigerant in the first refrigeration pipeline 21 flows into the third cooling branch 25, it first passes through the capillary tube 251. In the capillary tube 251, the pressure of the first refrigerant decreases due to the sudden decrease in the diameter of the tube, and the temperature also decreases. The first refrigerant that has been throttled and reduced in pressure enters the evaporator 252. The first refrigerant in the evaporator 252 performs heat exchange with the reactor device 13, absorbs the heat generated by the reactor device 13, and reduces the temperature of the reactor device 13.

[0090] The third cooling branch 25 may include a fifth stop valve 253, which is located at the upstream side of the capillary tube 251. When the reactor 13 needs to be cooled, the fifth stop valve 253 is opened to allow the low-temperature first refrigerant in the first refrigeration pipeline 21 to flow into the third cooling branch 25. The first refrigerant first passes through the fifth stop valve 253 and enters the capillary tube 251.

[0091] The third cooling branch 25 includes a sixth stop valve 254, which is located downstream of the evaporator 252. The first refrigerant flowing out of the evaporator 252 passes through the sixth stop valve 254 and flows back to the first refrigeration pipeline 21 to continue to participate in the circulation of the entire first refrigerant system.

[0092] In this embodiment, by adjusting the opening of the fifth stop valve 253 and the sixth stop valve 254, the flow of the first refrigerant in the third cooling branch 25 can be accurately controlled, thereby achieving fine control of the cooling effect of the reactor 13. The cooling intensity can be flexibly adjusted according to different working conditions and temperature requirements to improve the adaptability of the system. In addition, when performing system maintenance and overhaul, closing the fifth stop valve 253 and the sixth stop valve 254 can facilitate the operation of various components of the third cooling branch 25, thereby improving maintenance efficiency and convenience. Maintenance time and cost are reduced, and the reliability and stability of the system are ensured.

[0093] In addition, in this embodiment, the inverter device 12 can be electrically connected to the electrical device of the cooling system to supply power to the electrical device of the cooling system. The electrical device of the cooling system can include at least a compressor 212, and can also include other auxiliary equipment, such as an air cooling device, an electric actuator of a control valve, and various sensors, etc., which are not limited to this.

[0094] When the photovoltaic power generation system operates normally, the inverter device 12 converts the direct current generated by the photovoltaic panels into alternating current. Part of the alternating current can be directly supplied to the external power grid or load, and the other part is supplied to the power consumption device of the cooling system. By supplying power to the power consumption device of the cooling system through the inverter device 12, the energy recycling within the photovoltaic power generation system is realized, and the energy utilization efficiency is improved. The dependence on the external power grid is reduced, and the energy cost is reduced.

[0095] For the compressor 212 in the cooling system, the inverter device 12 provides corresponding power according to its power demand. The compressor 212 operates under the power drive, provides power for the first refrigerant system, and realizes the cooling of the inverter device 12, the reactor device 13, etc. The clean energy generated by the photovoltaic power generation system is fully utilized to power the cooling system, which reduces the consumption of traditional energy and meets the requirements of energy conservation and environmental protection. At the same time, the carbon emissions of the system are reduced, which is more environmentally friendly.

[0096] In addition, in this embodiment, in order to ensure the stable operation of the system and the rational use of energy, an energy management system can be set. The system monitors the power generation of the photovoltaic power generation system, the output power of the inverter device 12, and the power consumption of the cooling system electrical devices in real time. According to the monitoring data, the output power distribution of the inverter device 12 is adjusted to give priority to meeting the needs of the cooling system electrical devices to ensure the normal operation of the cooling system. At the same time, when the photovoltaic power generation is sufficient, the excess power can be supplied to the external power grid. When the photovoltaic power generation is insufficient, the key equipment of the system can still operate normally by switching the power supply or reducing the power of the cooling system electrical devices.

[0097] In this embodiment, a safety protection device such as overcurrent protection, overvoltage protection, short circuit protection, etc. can be provided in the connection between the inverter device 12 and the cooling system electrical device. When an abnormal situation occurs, the protection device can quickly cut off the power supply to prevent equipment damage and safety accidents.

[0098] This embodiment can cool down the inverter device 12 of the photovoltaic power generation system through the first refrigerant system, which can reduce the damage of high temperature to the internal components of the inverter device 12, thereby extending the service life of the inverter device 12, and ensuring the reliability of the inverter device 12 and reducing maintenance costs. In addition, this embodiment can also cool down the photovoltaic power generation device 11 (such as a photovoltaic panel) of the photovoltaic power generation system through the second refrigerant system, reduce the impact of temperature on the photoelectric conversion efficiency, improve the photovoltaic power generation efficiency, and reduce the damage of high temperature to the internal components of the photovoltaic power generation device 11, extend the service life of the photovoltaic power generation device 11, further improve the reliability of the photovoltaic power generation system, improve the stability and performance of the system, and reduce maintenance costs. The cooling system of the photovoltaic power generation system of this embodiment has significant innovation and practicality, and can provide strong support for the development of photovoltaic power generation technology.

[0099] In an exemplary embodiment, a control method for a photovoltaic system is provided. The photovoltaic system may be the photovoltaic system in the above embodiment.

[0100] Among them, reference Figure 1 and Figure 2 As shown, in this control method, when the photovoltaic power generation device 11 is in operation, the first cooling branch 22 is controlled to cool the inverter device 12 by conveying the first refrigerant through the first refrigeration pipeline 21, which can reduce the damage of high temperature to the internal components of the inverter device 12, thereby extending the service life of the inverter device 12, and can also ensure the reliability of the inverter device 12 and reduce maintenance costs.

[0101] When the power of the photovoltaic power generation device 11 is reduced to within a set percentage before the set time, the second refrigeration pipeline 23 is controlled to cool the second refrigerant in the second cooling branch 24 by using the first refrigerant transported by the first refrigeration pipeline 21 .

[0102] It should be noted that the set duration and the set percentage can be set according to actual conditions, and there is no limit on their specific values.

[0103] In addition, the cooling system forms a closed loop. During the entire photovoltaic power generation process, the inverter device 12 is the location where the maximum cooling capacity is required. If the inverter device 12 is to achieve the best effect, the cooling capacity that the first refrigeration pipeline 21 can provide needs to be greater than the heat generated by the maximum power generation of the photovoltaic power generation device 11. When the above conditions are met, the power generation of the photovoltaic power generation device 11 can be reduced from the original 100% to 2% when the control and adjustment are considered due to weather reasons, and the cooling capacity of the first refrigeration pipeline 21 needs to be controlled according to the operating state of the compressor 212. When the power generation of the photovoltaic power generation device 11 is reduced to 2%, the frequency of the compressor 212 needs to be reduced to adjust the cooling capacity provided by the chiller, but the compressor 212 has a minimum operating frequency. This minimum value is set to meet the reliability of the unit. When the compressor 212 runs to the lowest frequency, the cooling capacity of the first refrigeration pipeline 21 is much greater than the heat generated when the power generation is 2%.

[0104] In general, the cooling capacity of the first refrigeration pipeline 21 can be reduced from the original 100% to 15%. In the above operating state, the first refrigeration pipeline 21 will generate excess cooling capacity. When this situation is detected, the excess cooling capacity can be stored in the cooling tower 241 through the first control valve 221, and this stored cooling capacity can be used when the surface temperature of the photovoltaic power generation device 11 is high. For example, a pipeline of the second refrigerant can be set around the photovoltaic power generation device 11 to transport the second refrigerant in the cooling tower 241 to cool the photovoltaic power generation device 11.

[0105] For example, if the power of the photovoltaic power generation device 11 suddenly drops to within 5% of 1 minute ago, the compressor 212 can be controlled to operate at the lowest frequency, and the first control valve 221 can be opened so that the first refrigerant transported by the first refrigerant pipeline 21 through the second refrigeration pipeline 23 cools the second refrigerant in the second cooling branch 24.

[0106] In this photovoltaic system, the temperature of the photovoltaic power generation device 11 can also be monitored, and then based on the temperature and temperature change rate of the photovoltaic power generation device 11, the operating frequency of the compressor 212 of the first refrigeration circuit 21 can be controlled to control the degree of cooling of the inverter device 12 by the first cooling branch 22.

[0107] It should be noted that the photovoltaic power generation device 11 generally has a suitable operating temperature range, and within the suitable operating temperature range, the efficiency of the photovoltaic power generation device 11 is better. The suitable operating temperature range is recorded as T1-T2, that is, when the temperature of the photovoltaic power generation device 11 is greater than T1 and less than T2, its power is better.

[0108] In some embodiments,

[0109] The monitored temperature of the photovoltaic power generation device 11 is recorded as the actual temperature T, and the suitable operating temperature range of the photovoltaic power generation device 11 is recorded as the optimal operating range T1-T2. In this embodiment, a thermocouple can be used to detect the actual temperature T of the photovoltaic power generation device 11. Among them, the temperature rise rate (temperature rise rate) of the actual temperature T can be recorded as a, and its calculation formula is a=current actual temperature-actual temperature 60s ago, in units of ℃ / min.

[0110] This embodiment may control the operating frequency of the compressor 212 based on the following table.

[0111]

[0112] In this embodiment, for example, when the real-time temperature T of the photovoltaic power generation device 11 is less than or equal to T1, it means that the photovoltaic power generation device 11 needs to be heated up to reach a suitable temperature. In this case, if the temperature rise rate of the photovoltaic power generation device 11 is less than or equal to -1, it means that the photovoltaic power generation device 11 is cooling down. In view of this, it is necessary to reduce the cooling capacity of the first refrigeration pipeline 21, so that the frequency of the compressor 212 can be controlled to be reduced by 3Hz.

[0113] It should be noted that, in addition to the above-mentioned control of the frequency of the compressor 212, it can also be achieved by other methods, which are not limited to this.

[0114] Among them, when it is detected that the power of the photovoltaic power generation device 11 is greater than the set power, it means that the working capacity of the photovoltaic power generation device 11 is improved and the real-time temperature rises. At this time, the previously stored low-temperature second refrigerant can be transported to the location of the photovoltaic power generation device 11 for cooling.

[0115] It should be noted that the set power can be set according to actual conditions, and its specific value is not limited. In addition, in this embodiment, the set power can be used to directly determine whether the photovoltaic power generation device 11 needs to be cooled, or the real-time temperature can be directly used to determine whether the photovoltaic power generation device 11 needs to be cooled.

[0116] For example, if the real-time temperature of the photovoltaic power generation device 11 is greater than the set temperature, the second cooling branch 24 is controlled to cool the photovoltaic power generation device 11 through the second refrigerant. If the real-time temperature of the photovoltaic power generation device 11 is less than or equal to the set temperature, the second cooling branch 24 can be controlled to no longer cool the photovoltaic power generation device 11. It should be noted that the set temperature can be set according to actual conditions, and its specific value is not limited.

[0117] In addition, in this embodiment, when the reactor device 13 is controlled to be in operation to transmit at least part of the electricity generated by the photovoltaic power generation device 11 to the power supply network, the third cooling branch 25 is controlled to cool the reactor device 13 by transporting the first refrigerant through the first refrigeration pipeline 21.

[0118] It should be noted that the AC power generated by the inverter device 12 can be supplied to electrical equipment or to electrical devices in the cooling system, forming a closed loop of power consumption. When there is still some AC power remaining, the reactor device 13 can be started to convert the excess AC power into high-voltage power and transmit it back to the power grid, while increasing the frequency of the compressor 212. The fifth stop valve 253 and the sixth stop valve 254 of the third cooling branch 25 are opened, and the heat dissipation of the reactor device 13 is absorbed by the additional cold energy, thereby simultaneously increasing the conversion efficiency and life of this part of the function. Among them, the frequency increased by the compressor 212 is determined based on the cooling capacity required by the reactor device 13.

[0119] This embodiment can cool down the inverter device 12 of the photovoltaic power generation system through the first refrigerant system, which can reduce the damage of high temperature to the internal components of the inverter device 12, thereby extending the service life of the inverter device 12, and can also ensure the reliability of the inverter device 12 and reduce maintenance costs. In addition, this embodiment can also cool down the photovoltaic power generation device 11 (such as a photovoltaic panel) of the photovoltaic power generation system through the second refrigerant system, reduce the impact of temperature on the photoelectric conversion efficiency, improve the photovoltaic power generation efficiency, and reduce the damage of high temperature to the internal components of the photovoltaic power generation device 11, extend the service life of the photovoltaic power generation device 11, further improve the reliability of the photovoltaic power generation system, improve the stability and performance of the system, and reduce maintenance costs. In addition, the third cooling branch 25 is used to cool down the reactor 13 to improve the conversion efficiency and life of the reactor 13. The cooling system of the photovoltaic power generation system of this embodiment has significant innovation and practicality, and can provide strong support for the development of photovoltaic power generation technology.

[0120] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0121] It should be noted that the phrases "one implementation", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0122] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more limiting values, the elements defined by the sentence "comprise a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0123] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A cooling system for a photovoltaic power generation system, characterized in that: The photovoltaic power generation system includes a photovoltaic power generation device and an inverter device, and the cooling system includes a first refrigerant system and a second refrigerant system; The first refrigerant system includes a first refrigeration pipeline and a first cooling branch which are interconnected; the first refrigeration pipeline is used to provide a low-temperature first refrigerant to the first refrigerant system; the first cooling branch is used to cool the inverter device by the first refrigerant transported by the first refrigeration pipeline; The second refrigerant system includes a second refrigeration pipeline and a second cooling branch, the second refrigeration pipeline is connected to the first refrigeration pipeline; the second refrigeration pipeline is used to cool the second refrigerant in the second cooling branch by the first refrigerant transported by the first refrigeration pipeline; the second cooling branch is used to cool the photovoltaic power generation device by the second refrigerant; The second cooling branch includes a cooling tower, the second refrigeration pipeline includes a second control valve and a second cooling device, the second control valve is located at the upstream side of the second cooling device, and the second cooling device is used to cool the second refrigerant in the cooling tower; Wherein, when the power of the photovoltaic power generation device is greater than the set power, the photovoltaic power generation device is cooled by the second cooling branch; The inverter device is electrically connected to the electrical device of the cooling system to supply power to the electrical device of the cooling system, and the output power distribution of the inverter device gives priority to meeting the needs of the electrical device, and the electrical device includes at least a compressor; wherein, when the first refrigeration pipeline generates excess cooling capacity, the excess cooling capacity is stored in the cooling tower through the first refrigeration pipeline and the second refrigeration pipeline.

2. The cooling system according to claim 1, characterized in that: The inverter device includes an inverter module and a rectifier module, the first cooling branch includes a first control valve and a first cooling device for cooling the inverter device, and the first control valve is located at the upstream side of the first cooling device; The refrigerant inlet of the first cooling device is arranged close to the rectifier module, and the refrigerant outlet of the first cooling device is arranged close to the inverter module, so as to realize cooling for the inverter device.

3. The cooling system according to claim 2, characterized in that: The first cooling branch includes a first stop valve, and the first stop valve is located between the first control valve and the first cooling device; and / or, The first cooling branch includes a second stop valve, and the second stop valve is located at the downstream side of the first cooling device.

4. The cooling system according to claim 1, characterized in that: The second refrigeration pipeline includes a third stop valve, and the third stop valve is located between the second control valve and the second temperature reduction device; and / or, The second refrigeration pipeline includes a fourth stop valve, and the fourth stop valve is located at the downstream side of the second temperature reduction device.

5. The cooling system according to claim 1, characterized in that: The cooling system includes an air cooling device, and the air cooling device is used to cool the second refrigerant in the cooling tower.

6. The cooling system according to any one of claims 1 to 5, characterized in that: The photovoltaic power generation system includes an inductive reactance device, and the first refrigerant system includes a third cooling branch, which is connected to the first refrigeration pipeline. The third cooling branch is used to cool the inductive reactance device using the first refrigerant transported through the first refrigeration pipeline.

7. The cooling system according to claim 6, characterized in that: The third cooling branch includes a capillary tube and an evaporator. The capillary tube is located on the upstream side of the evaporator. The evaporator is used to cool the reactor device.

8. The cooling system according to claim 7, characterized in that: The third cooling branch includes a fifth stop valve, and the fifth stop valve is located at the upstream side of the capillary tube; and / or, The third temperature-lowering branch includes a sixth stop valve, and the sixth stop valve is located at a downstream side of the evaporator.

9. A photovoltaic system, characterized in that: The photovoltaic system includes a photovoltaic power generation system, which includes a photovoltaic power generation device, an inverter device and a reactor device. The photovoltaic system also includes a cooling system as described in any one of claims 1 to 8.

10. A control method for a photovoltaic system, characterized in that: The photovoltaic system is the photovoltaic system as claimed in claim 9, the photovoltaic system includes a photovoltaic power generation system and a cooling system, the photovoltaic power generation system includes a photovoltaic power generation device and an inverter device, the cooling system includes a first refrigerant system and a second refrigerant system; the first refrigerant system includes a first refrigeration pipeline and a first cooling branch that are interconnected, and the second refrigerant system includes a second refrigeration pipeline and a second cooling branch; The control method comprises: When the photovoltaic power generation device is in operation, controlling the first cooling branch to cool the inverter device through the first refrigerant transported by the first refrigeration pipeline; When the power of the photovoltaic power generation device is reduced to within a set percentage before a set time, the second refrigeration pipeline is controlled to cool the second refrigerant in the second cooling branch by transporting the first refrigerant through the first refrigeration pipeline.

11. The control method according to claim 10, characterized in that: The first refrigeration pipeline includes a compressor, and the first cooling medium transported by the first cooling branch through the first refrigeration pipeline is controlled to cool the inverter device, including: Monitoring the temperature of the photovoltaic power generation device; Based on the temperature and temperature change rate of the photovoltaic power generation device, the operating frequency of the compressor of the first refrigeration pipeline is controlled to control the degree to which the first cooling branch cools the inverter device.

12. The control method according to claim 10, characterized in that: The first refrigeration pipeline includes a compressor, and when the power of the photovoltaic power generation device is reduced to within a set percentage before a set time, the control method includes: The compressor is controlled to operate at a minimum frequency; wherein the cooling capacity of the compressor when operating at the minimum frequency is greater than the cooling capacity required by the inverter device.

13. The control method according to any one of claims 10 to 12, characterized in that: The photovoltaic power generation system includes a reactor device, the first refrigerant system includes a third cooling branch, and the control method includes: When the reactor device is controlled to be in operation so as to transmit at least part of the electricity generated by the photovoltaic power generation device to the power supply network, the third cooling branch is controlled to cool the reactor device using the first refrigerant transported by the first refrigeration pipeline.

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