Photovoltaic system

Abstract

The invention provides a photovoltaic system. The photovoltaic system comprises a photovoltaic module; a steam generating structure; a steam collector; a steam condensation structure; the liquid level in the steam condensation structure is flush with the liquid level in the steam collector. According to the photovoltaic system provided by the invention, the steam generation structure is arranged in the photovoltaic module, and the steam quantity generated in the steam generation structure can be automatically adjusted along with the temperature of the photovoltaic module, so that dynamic heat dissipation can be performed on the photovoltaic module to prevent the temperature of the photovoltaic module from being too low or too high, and the reliability and the service life of the photovoltaic module are ensured; and the liquid level conservation principle of the communicating vessel is utilized, so that a medium released by heat and liquefied in the steam condensation structure automatically flows into the steam generation structure and the steam collector, the heat dissipation effect on the photovoltaic module can be realized under the condition that a power mechanism (such as a compressor) is not arranged, the production cost of the photovoltaic module is reduced, and the production efficiency of the photovoltaic module is improved. And the energy consumption of the power mechanism is avoided, and the power generation efficiency of the photovoltaic module is improved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic system. Background Art

[0002] Photovoltaic power generation system refers to a power generation system that uses the photovoltaic effect of photovoltaic cells to directly convert solar radiation energy into electrical energy. Photovoltaic modules are products that are packaged and protected after a certain number of solar cells are connected in series or parallel. The photoelectric conversion efficiency of photovoltaic modules is mainly affected by irradiance, temperature, etc., and is the top priority when designing photovoltaic modules.

[0003] However, one of the defects of photovoltaic modules is that the photovoltaic conversion efficiency is only within 30%, but the light absorption rate of photovoltaic modules is about 85%. Therefore, 50% of the photon energy is not reasonably utilized, but becomes heat dissipation. Conventional photovoltaic modules are composed of glass plates, adhesive films, silicon wafers, and PVE backplanes. Obviously, the above materials do not have good heat exchange performance. Usually, if only natural convection and thermal radiation are used for heat dissipation, the temperature of photovoltaic modules can reach above 50°C.

[0004] The current PVT components are improvements made to address the situation where the temperature of photovoltaic modules is too high and the efficiency is negatively affected. Refrigerants (liquids), air (gases), etc. are usually used for forced convection heat exchange, and a certain operating load is added to obtain a lower operating temperature of the photovoltaic modules, thereby improving the photovoltaic efficiency of the photovoltaic modules. However, the existing PVT components cannot be dynamically adjusted according to the temperature of the photovoltaic modules in a timely manner, and a complete set of refrigeration equipment including a compressor is required, which consumes additional electricity from the photovoltaic modules, resulting in a shortened service life of the photovoltaic system, high production costs and low power generation efficiency. Summary of the invention

[0005] In order to solve the technical problems in the prior art that the heat dissipation of the PVT components of the photovoltaic system is unreliable and the energy consumption is high, which affects the reliability and power generation efficiency of the photovoltaic system and increases the production cost, a photovoltaic system is provided which does not require a compressor but utilizes the boiling of the medium to generate steam for circulating heat dissipation to adaptively dissipate the temperature of the photovoltaic components without requiring additional energy consumption.

[0006] A photovoltaic system, comprising:

[0007] Photovoltaic panels;

[0008] A steam generating structure, wherein the steam generating structure is disposed on the photovoltaic module, and a medium inlet is disposed at a lower end of the steam generating structure, and a medium outlet is disposed at an upper end of the steam generating structure;

[0009] A steam collector, the steam collector is arranged above the steam generating structure, and a first inlet is arranged at a lower portion of the steam collector, and a first outlet is arranged at an upper portion of the steam collector, and the first inlet is communicated with the medium outlet;

[0010] A steam condensation structure, wherein the steam condensation structure is disposed on one side of the steam collector, and a second inlet is disposed at an upper portion of the steam condensation structure, and a second outlet is disposed at a lower portion of the steam condensation structure, the second inlet is communicated with the first outlet, and the second outlet is communicated with the medium inlet;

[0011] The liquid level in the steam condensation structure is flush with the liquid level in the steam collector.

[0012] The photovoltaic system further includes a first connecting pipe, the first outlet is connected to the second inlet through the first connecting pipe, and the highest point of the first connecting pipe is higher than the second inlet.

[0013] The first connecting pipeline includes an ascending section and a descending section connected to each other, the ascending section is connected to the first outlet, the descending section is connected to the second inlet, and the connecting position of the ascending section and the descending section constitutes the highest point of the first connecting pipeline.

[0014] The first communicating pipeline is provided with a first one-way valve, and the flow direction of the first one-way valve is from the first outlet to the second inlet.

[0015] The photovoltaic system further includes a second connecting pipe, the second outlet is connected to the medium inlet through the second connecting pipe, and at least a portion of the second connecting pipe is lower than the medium inlet.

[0016] The second connecting pipe is provided with a second one-way valve, and the flow direction of the second one-way valve is from the second outlet to the medium inlet.

[0017] The photovoltaic system further comprises an auxiliary heat dissipation structure, which is arranged on the steam condensation structure and can dissipate heat for the upper half of the steam condensation structure.

[0018] The auxiliary heat dissipation structure comprises a heat dissipation water pipe and a circulation pump. The heat dissipation water pipe is distributed on the upper half of the steam condensation structure, and the circulation pump is arranged on the heat dissipation water pipe.

[0019] The auxiliary heat dissipation structure includes a water tank, and the heat dissipation water pipe is connected to the water tank; or, the auxiliary heat dissipation structure includes a cooling tower, and the heat dissipation water pipe is connected to the cooling tower; or, the inlet of the heat dissipation water pipe is connected to groundwater.

[0020] The steam generating structure includes at least two longitudinal flow channels and multiple transverse flow channels, all of the longitudinal flow channels are distributed in parallel along the width direction of the photovoltaic module, and one end of each of the longitudinal flow channels is connected to the medium inlet, and the other end is connected to the medium outlet, and the transverse flow channels are distributed between two adjacent longitudinal flow channels.

[0021] The photovoltaic system provided by the present invention sets a steam generating structure in a photovoltaic module. The waste heat generated by the photovoltaic module can heat the medium in the steam generating structure. After the medium is heated, it boils and generates steam to take away the waste heat, thereby realizing the heat dissipation of the photovoltaic module. At the same time, the steam naturally rises and flows into the steam condensation structure to dissipate heat and condense, and finally circulates into the steam generating structure. The amount of steam generated in the steam generating structure can be automatically adjusted with the temperature of the photovoltaic module, so that the photovoltaic module can be dynamically dissipated to avoid the temperature of the photovoltaic module being too low or too high, thereby ensuring the reliability and service life of the photovoltaic module. Moreover, since the liquid level in the steam collector is flush with the liquid level in the steam condensation structure, the principle of conservation of liquid level in the communicating vessel can be utilized to make the exothermic liquefied medium in the steam condensation structure automatically flow into the steam generating structure and the steam collector, thereby realizing the heat dissipation effect of the photovoltaic module without setting a power mechanism (such as a compressor), reducing the production cost of the photovoltaic module, and avoiding the energy consumption of the power mechanism to improve the power generation efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a photovoltaic system provided by an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a steam generating structure provided by an embodiment of the present invention;

[0024] Figure 3 Another structural schematic diagram of a steam generating structure provided by an embodiment of the present invention;

[0025] In the figure:

[0026] 1. Photovoltaic module; 2. Steam generation structure; 21. Medium inlet; 22. Medium outlet; 3. Steam collector; 31. First inlet; 32. First outlet; 4. Steam condensation structure; 41. Second inlet; 42. Second outlet; 51. Ascending section; 52. Descending section; 6. First one-way valve; 7. Second connecting pipe; 8. Second one-way valve; 91. Heat dissipation water pipe; 92. Circulation pump. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The current PVT components are improvements made to address the situation where the temperature of photovoltaic modules is too high and the efficiency is negatively affected. Refrigerants (liquids), air (gases), etc. are usually used for forced convection heat exchange, and a certain operating load is added to obtain a lower operating temperature of the photovoltaic modules, thereby improving the photovoltaic efficiency of the photovoltaic modules. However, the existing PVT components cannot be dynamically adjusted according to the temperature of the photovoltaic modules in a timely manner, and a complete set of refrigeration equipment including a compressor is required, which consumes additional electricity from the photovoltaic modules, resulting in a shortened service life of the photovoltaic system, high production costs and low power generation efficiency.

[0033] To this end, the present application provides a Figures 1 to 3 The photovoltaic system shown includes: a photovoltaic component 1; a steam generating structure 2, wherein the steam generating structure 2 is arranged on the photovoltaic component 1, and a medium inlet 21 is arranged at the lower end of the steam generating structure 2, and a medium outlet 22 is arranged at the upper end; a steam collector 3, wherein the steam collector 3 is arranged above the steam generating structure 2, and a first inlet 31 is arranged at the lower part of the steam collector 3, and a first outlet 32 ​​is arranged at the upper part, and the first inlet 31 is communicated with the medium outlet 22; a steam condensation structure 4, wherein the steam condensation structure 4 is arranged on one side of the steam collector 3, and a second inlet 41 is arranged at the upper part of the steam condensation structure 4, and a second outlet 42 is arranged at the lower part, the second inlet 41 is communicated with the first outlet 32, and the second outlet 42 is communicated with the medium inlet 21; the liquid level in the steam condensation structure 4 is flush with the liquid level in the steam collector 3.

[0034] The steam generating structure 2 is arranged in the photovoltaic module 1, and the waste heat generated by the photovoltaic module 1 can heat the medium in the steam generating structure 2. After the medium is heated, it boils and generates steam to take away the waste heat, thereby realizing the heat dissipation of the photovoltaic module 1. At the same time, the steam naturally rises and flows to the steam condensation structure 4 to dissipate heat and condense, and finally circulates to the steam generating structure 2. The amount of steam generated in the steam generating structure 2 can be automatically adjusted with the temperature of the photovoltaic module 1, so that the photovoltaic module 1 can be dynamically cooled to avoid the temperature of the photovoltaic module 1 being too low or too high, thereby ensuring the reliability and service life of the photovoltaic module 1. Moreover, since the liquid level in the steam collector 3 is flush with the liquid level in the steam condensation structure 4, the principle of conservation of liquid level in the communicating vessel can be utilized to make the exothermic liquefied medium in the steam condensation structure 4 automatically flow into the steam generating structure 2 and the steam collector 3, thereby realizing the heat dissipation effect of the photovoltaic module 1 without setting a power mechanism (such as a compressor), reducing the production cost of the photovoltaic module 1, and avoiding the energy consumption of the power mechanism to improve the power generation efficiency of the photovoltaic module 1.

[0035] When the photovoltaic system is in use, the photovoltaic module 1 is irradiated by sunlight to generate electricity. At this time, the temperature of the photovoltaic module 1 will gradually increase. At this time, the temperature of the photovoltaic module 1 will be transferred to the steam generating structure 2 to heat the medium in the steam generating structure 2. The medium absorbs heat and boils to generate steam. The boiling of the medium and the rising process of the steam can both disturb the medium in the steam generating structure 2, thereby improving the efficiency of the medium absorbing heat from the photovoltaic module 1. The steam will enter the steam collector 3 from the top of the steam generating structure 2 and be collected, and then continue to flow to the steam condensation structure 4 to be condensed into liquid, and then gathered in the steam condensation structure 4, and then Through the principle of conservation of liquid level in communicating vessels, the liquid level in the steam condensation structure 4 is kept flush with the liquid level in the steam collector 3, thereby ensuring that the liquid medium in the steam condensation structure 4 will flow into the steam generating structure 2, realizing the circulation flow of the medium, and enabling the entire system to complete a directional thermodynamic cycle without additional power. Moreover, through the design of boiling heat exchange, the temperature distribution at the photovoltaic component 1 is uniform and consistent, and there will be no problem of local condensation or insufficient local heat exchange due to the distribution of the medium, local pressure changes at the inlet and outlet of the steam generating structure 2, and temperature increase, thereby improving the reliability of the photovoltaic system.

[0036] Among them, the medium circulating in the steam generating structure 2, the steam collector 3 and the steam condensing structure 4 is preferably r600a, r410a, r23. The specific requirements are that the vapor-liquid phase transition temperature is 25℃-35℃ within the range of 0.1-2MPa, and the latent heat of vaporization is required to be greater than 250KJ / Kg.

[0037] Under the standard irradiance of 1000W / m^2, the temperature of photovoltaic panels can reach 60-70 degrees. Under certain extreme conditions or aging damage, the temperature can even reach 150°C. Therefore, in fact, setting the vapor-liquid phase transition temperature of the medium below 50°C can achieve reliable heat dissipation of photovoltaic modules.

[0038] As an embodiment, the photovoltaic system also includes a first connecting pipe, and the first outlet 32 ​​is connected to the second inlet 41 through the first connecting pipe. The highest point of the first connecting pipe is higher than the second inlet 41. The first connecting pipe is used to achieve communication between the steam collector 3 and the steam condensation structure 4. At the same time, the highest point of the first connecting pipe is used to reflux the liquid medium that may exist in the first connecting pipe (for example, the liquid medium carried by the steam or the medium liquefied during the flow in the first connecting pipe) into the steam collector 3, so as to avoid the problem of accumulation and blockage of the liquid medium in the first connecting pipe, which causes the steam to be unable to flow, thereby ensuring the heat dissipation reliability of the photovoltaic module 1.

[0039] Specifically, the first connecting pipeline includes an ascending section 51 and a descending section 52 that are connected to each other, the ascending section 51 is connected to the first outlet 32, the descending section 52 is connected to the second inlet 41, and the connecting position of the ascending section 51 and the descending section 52 constitutes the highest point of the first connecting pipeline. By separately providing the ascending section 51 and the descending section 52, the installation of the first connecting pipeline is facilitated, and the maintenance of the photovoltaic system can also be facilitated.

[0040] The first connecting pipeline is provided with a first one-way valve 6, and the flow direction of the first one-way valve 6 is directed from the first outlet 32 ​​to the second inlet 41. The first one-way valve 6 is used to prevent the steam in the steam condensation structure 4 from flowing back into the steam collector 3, thereby ensuring reliable heat dissipation of the photovoltaic module 1. Preferably, the first one-way valve 6 is provided on the descending section 52, and the highest point is first used to prevent the liquid medium from being separated, so that only the steam-like medium can flow into the steam condensation structure 4. At this time, the first one-way valve 6 only needs to restrict the flow of steam in one direction, thereby preventing the liquid medium from gathering at the first one-way valve 6 and affecting the working reliability of the first one-way valve 6, thereby ensuring reliable heat dissipation of the photovoltaic module.

[0041] The photovoltaic system further includes a second connecting pipe 7, and the second outlet 42 is connected to the medium inlet 21 through the second connecting pipe 7, and at least a portion of the second connecting pipe 7 is lower than the medium inlet 21. The portion of the second connecting pipe 7 lower than the medium inlet 21 is used to make the steam generation structure 2, the steam collector 3 and the steam condensation structure 4 form a U-shaped connecting vessel, so that the liquid level in the steam collector 3 is always flush with the liquid level in the steam condensation structure 4. After the steam condenses into liquid in the steam condensation structure 4, the liquid level in the steam condensation structure 4 will rise. At this time, the connecting vessel principle will make the liquid medium in the steam condensation structure 4 flow into the steam generation structure 2 along the second connecting pipe 7 to continue absorbing heat, thereby realizing automatic circulation of the medium.

[0042] The second connecting pipe 7 is provided with a second one-way valve 8, and the flow direction of the second one-way valve 8 is directed from the second outlet 42 to the medium inlet 21. The medium boils in the steam generating structure 2 to generate steam and the pressure increases. At this time, the second one-way valve 8 is used to make the liquid medium flow only from the steam condensation structure 4 to the steam generating structure 2, so as to prevent the liquid medium from being squeezed into the steam condensation structure 4 by pressure, thereby ensuring the working reliability of the photovoltaic system. Preferably, the second one-way valve 8 is provided on the part of the second connecting pipe 7 that is lower than the medium inlet 21, that is, the second one-way valve 8 is provided at the position where the second connecting pipe 7 is located. Figure 1 The horizontal portion of the second connecting pipe 7 shown can prevent the second one-way valve 8 from being affected by gravity and unable to work reliably, and can also prevent the liquid medium from interfering with the operation of the second one-way valve 8 under the action of gravity, thereby improving the heat dissipation efficiency of the photovoltaic components and improving the reliability of the photovoltaic system.

[0043] The photovoltaic system further includes an auxiliary heat dissipation structure, which is disposed on the steam condensation structure 4 and can dissipate heat from the upper half of the steam condensation structure 4. The auxiliary heat dissipation structure is used to further improve the condensation efficiency of steam in the steam condensation structure 4, and the auxiliary heat dissipation structure can also transfer heat to other structures for reuse.

[0044] The auxiliary heat dissipation structure includes a heat dissipation water pipe 91 and a circulation pump 92. The heat dissipation water pipe 91 is distributed on the upper half of the steam condensation structure 4, and the circulation pump 92 is arranged on the heat dissipation water pipe 91. Heat dissipation refrigerant flows in the heat dissipation water pipe 91. When the heat dissipation refrigerant flows through the overlapping position of the heat dissipation water pipe 91 and the steam condensation structure 4, the heat of the steam condensation structure 4 can be transferred to the heat dissipation refrigerant in the heat dissipation water pipe 91. Then, under the drive of the circulation pump 92, the heat dissipation refrigerant receiving the heat continues to flow, thereby taking away the heat at the steam condensation structure 4, improving the heat dissipation efficiency of the photovoltaic module 1. At the same time, only the circulation pump 92 needs to be set, and the required energy consumption is much less than that of the refrigeration equipment with a compressor in the prior art, thereby achieving the purpose of improving the power generation efficiency of the photovoltaic module 1. Preferably, the heat dissipation refrigerant can be water. At this time, the water is relatively independent of the medium, and the water will not mix with the medium. The user can directly use the water in the heat dissipation water pipe 91, which is convenient for utilizing the waste heat generated by the photovoltaic module, and further improving the energy recovery effect of the photovoltaic system.

[0045] The auxiliary heat dissipation structure includes a water tank, and the heat dissipation water pipe 91 is connected to the water tank. The heat dissipation refrigerant flows back into the water tank, and the water tank is used for natural heat dissipation. Users can also directly obtain hot water or warm water from the water tank for use.

[0046] Alternatively, the auxiliary heat dissipation structure includes a cooling tower, and the heat dissipation water pipe 91 is connected to the cooling tower. The water in the heat dissipation water pipe 91 can be pumped to a high place in the cooling tower by a circulation pump 92, and then naturally flows downward under the action of gravity. In this process, the water will exchange heat with the air flowing through the cooling tower to dissipate heat, thereby achieving a heat dissipation effect. The efficient heat dissipation of the cooling tower is used to improve the heat dissipation efficiency of the steam condensation structure 4, thereby further improving the heat dissipation efficiency of the photovoltaic module 1.

[0047] Alternatively, the inlet of the heat dissipation water pipe 91 is connected to groundwater, the temperature of the groundwater is relatively low, and even if the heat of the steam is transferred to the groundwater, the temperature of the groundwater is less affected, thereby ensuring the heat dissipation efficiency of the heat dissipation water pipe 91 on the steam condensation structure 4.

[0048] Preferably, there is a temperature difference of 10° C. between the heat dissipation refrigerant in the heat dissipation water pipe 91 and the steam in the steam condensation structure 4 .

[0049] The steam generating structure 2 includes at least two longitudinal flow channels and a plurality of transverse flow channels, all of the longitudinal flow channels are arranged in parallel along the width direction of the photovoltaic module 1, and one end of each of the longitudinal flow channels is connected to the medium inlet 21, and the other end is connected to the medium outlet 22, and the transverse flow channels are distributed between two adjacent longitudinal flow channels. The longitudinal flow channels are utilized to ensure reliable flow of the medium. Meanwhile, the transverse flow channels can improve the distribution of the medium on the surface of the photovoltaic module 1, improve the heat dissipation efficiency of the photovoltaic module 1, and ensure the uniformity of heat dissipation of the photovoltaic module 1.

[0050] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A photovoltaic system, characterized in that: include: Photovoltaic modules (1); A steam generating structure (2), wherein the steam generating structure (2) is arranged on the photovoltaic module (1), and a medium inlet (21) is arranged at a lower end of the steam generating structure (2), and a medium outlet (22) is arranged at an upper end thereof; a steam collector (3), the steam collector (3) being arranged above the steam generating structure (2), and the steam collector (3) being provided with a first inlet (31) at the bottom and a first outlet (32) at the top, the first inlet (31) being in communication with the medium outlet (22); A steam condensation structure (4), wherein the steam condensation structure (4) is arranged on one side of the steam collector (3), and a second inlet (41) is arranged at the upper part of the steam condensation structure (4), and a second outlet (42) is arranged at the lower part, wherein the second inlet (41) is connected to the first outlet (32), and the second outlet (42) is connected to the medium inlet (21).

2. The photovoltaic system according to claim 1, characterized in that: The photovoltaic system further comprises a first connecting pipe, the first outlet (32) is connected to the second inlet (41) through the first connecting pipe, and the highest point of the first connecting pipe is higher than the second inlet (41).

3. The photovoltaic system according to claim 2, characterized in that: The first connecting pipeline comprises an ascending section (51) and a descending section (52) which are connected to each other, the ascending section (51) is connected to the first outlet (32), the descending section (52) is connected to the second inlet (41), and the connecting position of the ascending section (51) and the descending section (52) constitutes the highest point of the first connecting pipeline.

4. The photovoltaic system according to claim 2, characterized in that: A first one-way valve (6) is provided on the first connecting pipeline, and the flow direction of the first one-way valve (6) is directed from the first outlet (32) to the second inlet (41).

5. The photovoltaic system according to claim 1, characterized in that: The photovoltaic system further comprises a second connecting pipe (7), the second outlet (42) being connected to the medium inlet (21) via the second connecting pipe (7), and at least a portion of the second connecting pipe (7) is lower than the medium inlet (21).

6. The photovoltaic system according to claim 5, characterized in that: The second connecting pipe (7) is provided with a second one-way valve (8), and the flow direction of the second one-way valve (8) is directed from the second outlet (42) to the medium inlet (21).

7. The photovoltaic system according to claim 1, characterized in that: The photovoltaic system further comprises an auxiliary heat dissipation structure, which is arranged on the steam condensation structure (4), and the auxiliary heat dissipation structure is capable of dissipating heat from the upper half of the steam condensation structure (4).

8. The photovoltaic system according to claim 7, characterized in that: The auxiliary heat dissipation structure comprises a heat dissipation water pipe (91) and a circulation pump (92); the heat dissipation water pipe (91) is distributed on the upper half of the steam condensation structure (4); and the circulation pump (92) is arranged on the heat dissipation water pipe (91).

9. The photovoltaic system according to claim 8, characterized in that: The auxiliary heat dissipation structure comprises a water tank, and the heat dissipation water pipe (91) is connected to the water tank; or, the auxiliary heat dissipation structure comprises a cooling tower, and the heat dissipation water pipe (91) is connected to the cooling tower; or, the inlet of the heat dissipation water pipe (91) is connected to groundwater.

10. The photovoltaic system according to claim 1, characterized in that: The steam generating structure (2) comprises at least two longitudinal flow channels and a plurality of transverse flow channels, all of the longitudinal flow channels are arranged in parallel along the width direction of the photovoltaic module (1), one end of each of the longitudinal flow channels is connected to the medium inlet (21), and the other end is connected to the medium outlet (22), and the transverse flow channels are arranged between two adjacent longitudinal flow channels.

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