Coupling floating type photovoltaic closed pumped storage power generation system

Abstract

The invention discloses a coupling floating type photovoltaic closed pumped storage power generation system, which implements a cascade layout measure of a multi-stage reservoir according to different geological conditions, and adopts a gradient water delivery and convergent water drainage mode to realize separation of a water delivery pipe and a water drainage pipe. The problem that a photovoltaic cooling water conveying path is inconsistent with a water discharging path due to the fact that the photovoltaic cooling water conveying path winds around a photovoltaic panel is solved, meanwhile, a fan-type floating structure is adopted in the photovoltaic system, the water surface cross section area changes along with the change of the water level, the floating structure of the floating photovoltaic system is automatically opened and closed, it is guaranteed that the covering rate on the water surface is not changed, and the evaporation rate of a water body is reduced. According to photovoltaic power generation load changes, the direct-current water pumping unit is adjusted, the water hammer phenomenon is avoided, and the safety and reliability in the water pumping and energy storage process are improved. According to the invention, the problems of water surface coverage rate and photovoltaic extrusion of floating photovoltaic in pumped storage are well solved, and meanwhile, the pumped storage unit can cope with the randomness, volatility and intermittent change of renewable energy systems such as light, wind and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a closed pumped storage power generation system coupled with floating photovoltaics. Background Art

[0002] With the increasing installed capacity of wind and solar power, a new power system dominated by photovoltaic and wind power is gradually emerging, which requires the existing power system to change from a mode that mainly adapts to periodic changes in load to a mode that mainly adapts to the randomness, volatility and intermittent changes in power generation of renewable energy systems such as solar and wind. Pumped storage is a green, low-carbon, clean and flexible energy storage method and power regulation measure that is currently technically safe, has a systematic technical standard, has long-proven economic efficiency, and can be developed on a large scale. Therefore, the organic combination of pumped storage and wind and solar resources is an indispensable way for the new power system.

[0003] Building floating photovoltaic facilities on the water surface has the advantages of saving land, reducing evaporation of water on the water surface, preventing garbage on the water surface from blocking the water inlet, and inhibiting algae from polluting the water body. However, there are five challenges in the existing power model combining floating photovoltaics and pumped storage: (1) the site selection problem of pumped storage power stations; (2) the transmission safety of floating photovoltaics as the water level changes, and the problem of anti-squeezing treatment; (3) the coupling problem of photovoltaic direct current and water turbine pump units; (4) the water hammer effect of the water diversion system when the water pump input changes; (5) the cooling problem of floating photovoltaics.

[0004] In order to solve the site selection problem of pumped-storage power stations, it is an effective measure to use abandoned mines, landfills and other scenes with high head differences as application scenarios for pumped storage.

[0005] Chinese patent application number CN220306960U discloses a pumped storage-gravity storage-photovoltaic-wind power system utilizing abandoned coal mines, which fully utilizes the above-ground and underground space of abandoned coal mines as upper and lower reservoirs for pumped storage to absorb renewable energy.

[0006] Chinese patent application number CN219157594U discloses an open-pit coal mine spoil dump photovoltaic and pumped storage system, and proposes a comprehensive utilization model of spoil dump photovoltaics, pumped storage and ecological management. A pumped storage power station is built in the production-type open-pit coal mine spoil dump photovoltaic system, which fully utilizes the spoil dump space to reduce the floor area and comprehensively utilizes the water resources in the mine.

[0007] Chinese patent application number CN115288495A discloses a method for transforming a landfill into a combination of photovoltaic and hydroelectric power generation, and proposes a plan for pumped storage transformation of the landfill land and ancillary facilities and equipment after excavation and treatment.

[0008] To address the challenges of floating PV and pumped storage as water levels change, various new floating PV structures have been unveiled.

[0009] Chinese patent application number CN116526938A discloses a photovoltaic power generation device adapted to the water level of a pumped storage reservoir, which uses a magnetic device to ensure that the photovoltaic panels will not affect the transmission of electricity during the floating process as the water level changes.

[0010] Chinese patent application number CN217294859U discloses a slideway-type floating photovoltaic mooring structure suitable for a pumped storage power station reservoir, in which a slider slides up or down on a slideway to drive a floating photovoltaic assembly to float stably on a relative position on the water surface to adapt to the fluctuation of the reservoir water level.

[0011] Chinese patent application number CN117508492A discloses a water surface photovoltaic system, in which one end of the mooring unit is fixed on the dam foundation above the preset water level of the reservoir, so that the mooring unit is always above the water surface. Keeping the cable in the connecting unit taut with the rise and fall of the water level can help reduce the evaporation of the reservoir water and improve the efficiency of the pumped storage power station.

[0012] In order to solve the coupling problem between the above-mentioned photovoltaic direct current and the pump-turbine unit, the renewable resources are first converted into alternating current through the inverter, and then drive the existing pump-turbine unit to generate electricity.

[0013] Chinese patent application number CN102384039A discloses a hybrid wind-solar hybrid pumped storage system and its control method, which uses wind-solar power generation to drive a reversible pump-turbine unit to achieve pumped storage. The required power generation is achieved through a reversible pump-turbine unit.

[0014] Chinese patent application number CN113890100A discloses a mountain water supply and power supply system based on photovoltaic micro pumped storage, which adopts a double-fed asynchronous generator and uses the electricity of mountain photovoltaics and floating photovoltaics on the water surface to pump water from the lower reservoir to the upper reservoir.

[0015] Chinese patent application number CN116961037A discloses a photovoltaic power generation combined with pumped storage system and design method, which combines the same DC pump with the same AC generator to convert photovoltaic DC power into AC power through pumped storage.

[0016] In summary, in the existing technologies of pumped storage and wind and solar resources, in order to solve the transmission safety of floating photovoltaic systems with water level changes and the problem of anti-squeezing, the water surface coverage of photovoltaics is reduced, which will lead to an increase in the evaporation rate of the water surface. In solving the coupling of floating photovoltaics and water turbine pump units, inverters or DC and AC coupling are coupled with water turbine pumps.

[0017] In the process of realizing the present invention, the inventors realized that the existing methods have at least the following problems: the existing methods do not realize how to solve the water hammer effect of the water diversion system when the water pump input changes, and the conflict between the cooling and coverage rate of the floating photovoltaic on the water surface. At the same time, the single upper and lower reservoir model also greatly limits the construction scale of pumped storage. How to ensure the coverage rate of photovoltaics on the water surface solves the squeezing of photovoltaic panels, etc., has become a problem that needs to be solved urgently. Summary of the invention

[0018] The embodiment of the present invention provides a closed pumped storage power generation system coupled with floating photovoltaics to ensure the coverage rate of photovoltaics on the water surface, reduce the evaporation rate of the water surface, and improve the efficiency of photovoltaic power generation.

[0019] In order to solve the above technical problems, the embodiment of the present application provides a closed pumped storage power generation system coupled with floating photovoltaics, which is applied to gradient distribution reservoir scenarios. The closed pumped storage power generation system coupled with floating photovoltaics includes a water pump power supply system, a DC water pump, a downpipe, a turbine and a power supply network; wherein,

[0020] The water pump power supply system includes a floating photovoltaic system, which is used to drive the DC water pump to transport the water from the reservoir to the upper reservoir in the gradient distribution water layer. The floating photovoltaic system is a fan-shaped floating structure, which is dynamically opened and closed according to the change of the water surface cross-sectional area as the water level changes;

[0021] The sewer pipe forms a sewer network, which is connected to the turbine in the upper-level reservoir. The water discharge drives the turbine to generate alternating current, which is then transmitted to the power supply network.

[0022] Optionally, the sewer network and the water turbine form a water transmission network, and the next-level height reservoir and the previous-level height reservoir are connected through the water transmission network.

[0023] Optionally, the water pump power supply system also includes a land power generation system, and the water pump power supply system selects a power supply source according to water transmission power requirements.

[0024] Optionally, a DC water pump provided by floating photovoltaics is used to pump water to the upper-level reservoir, and a downpipe leads the water from the upper-level reservoir to the turbine for power generation and then to the lower-level reservoir, where the photovoltaic DC power is converted into AC power and input into the power system.

[0025] Optionally, corresponding DC pumps are configured according to the height difference of reservoirs of different levels, and the pump combination is adjusted according to the photovoltaic power generation capacity.

[0026] Optionally, as the water level of the floating photovoltaic fan-shaped floating structure decreases, the components connected to the edge of the reservoir will be unfolded, and the components between the photovoltaic panels will be closed.

[0027] Optionally, the fan-shaped floating structure of the floating photovoltaic includes deformation forms such as duck-web type, accordion type and spring type.

[0028] Optionally, the floating photovoltaic is a multi-stage photovoltaic array, a fan-shaped floating structure shore connector, a cooling water pump, a cooling plate, a floating plate, and a fan-shaped floating structure photovoltaic panel connector.

[0029] Optionally, the fan-shaped floating structure photovoltaic panel connector connects the floating panels of two adjacent photovoltaic arrays.

[0030] Optionally, when the water in the water pipe flows into the upper-level reservoir, a certain amount of water flows through the cooling plate of the photovoltaic panel and then flows into the reservoir.

[0031] The closed pumped storage power generation system coupled with floating photovoltaic provided by the embodiment of the present invention comprises a water pump power supply system, a DC water pump, a downpipe, a turbine and a power supply network; wherein the water pump power supply system comprises a floating photovoltaic, which is used to drive the DC water pump to transport the water of the reservoir to the upper-level reservoir in the gradient distribution water layer; the floating photovoltaic is a fan-shaped floating structure, which is dynamically opened and closed according to the change of the water surface cross-sectional area as the water level changes; the downpipe forms a downpipe network, which is connected to the turbine in the upper-level reservoir, and drives the turbine to generate AC power through drainage and transports it to the power supply network. The gradient water delivery and downpipe collection mode are adopted to realize the separation of the water delivery pipe and the downpipe, and the cascade layout measures of multi-level reservoirs are implemented according to different geological conditions, so as to solve the problem of inconsistency with the downpipe caused by the water delivery path bypassing the photovoltaic panel due to photovoltaic cooling, and the problem of water surface coverage and photovoltaic squeezing of floating photovoltaic in pumped storage is well solved, and the pumped storage unit can cope with the randomness, volatility and intermittent changes of renewable energy systems such as solar wind. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0033] Figure 1 Schematic diagram of a closed pumped storage power generation system coupled with floating photovoltaics;

[0034] Figure 2 This is a schematic diagram of a floating photovoltaic structure;

[0035] Figure 3It is a block diagram of a closed pumped storage power generation system coupled with floating photovoltaics for an abandoned open-pit coal mine and its mine caves according to an embodiment of the present application.

[0036] The names corresponding to the reference numerals are: 1. Reservoir; 2. Downstream outlet; 3. Water inlet; 4. Cooling water pumping pipe; 5. Cooling water pump; 6. Photovoltaic external transmission line; 7. Fan-shaped floating structure shore connector; 8. Water surface photovoltaic transmission line; 9. Cooling water inlet pipe; 10. Cooling plate; 11. Cooling water outlet pipe; 12. Cooling water return port; 13. Floating plate; 14. Fan-shaped floating structure photovoltaic panel connector; 15. Photovoltaic panel; 16. Lower reservoir; 17. Pump 1 lower water pipe; 18. Pump 1; 19. Pump 1 upper water pipe; 20. Tunnel reservoir; 21. Pump 2 lower water pipe; 22. Pump 2; 23. Pump 2 land renewable photovoltaic power supply line; 24. Pump 2 upper water pipe; 25. Pump 2 floating Photovoltaic power supply line; 26, open-pit floating photovoltaic; 27, turbine 1 upper and lower water pipes; 28, turbine 1; 29 turbine 1 transmission line; 30, turbine 1 lower and lower water pipes; 31, open-pit reservoir; 32, open-pit reservoir lower water pipe; 33, land wind turbine transmission line; 34, land wind turbine; 35, land photovoltaic system; 36, tunnel reservoir lower water pipe; 37, turbine 2 upper and lower water pipes; 38, turbine control room; 39, turbine 2 transmission line; 40, turbine 2; 41, turbine 2 lower and lower water pipes; 42, pump 1 floating photovoltaic power supply line; 43, lower reservoir floating photovoltaic; 44, substation; 45, external transmission line; 46, high-voltage power grid; 47, land photovoltaic transmission line. DETAILED DESCRIPTION

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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 are within the scope of protection of the present invention.

[0040] Figure 1 A closed pumped-storage power generation system coupled with floating photovoltaics provided by an embodiment of the present invention is shown, which is applied to a gradient distribution reservoir scenario. The closed pumped-storage power generation system coupled with floating photovoltaics includes a water pump power supply system, a DC water pump, a downpipe, a turbine and a power supply network; wherein the water pump power supply system includes floating photovoltaics, which is used to drive the DC water pump to transport the water of the reservoir to the upper-level reservoir in the gradient distribution water layer; the floating photovoltaics are fan-shaped floating structures, which are dynamically opened and closed according to the changes in the water surface cross-sectional area as the water level changes;

[0041] The sewer pipe forms a sewer network, which is connected to the turbine in the upper-level reservoir. The water discharge drives the turbine to generate alternating current, which is then transmitted to the power supply network.

[0042] Specifically, the gradient distribution reservoir scene includes abandoned mines, natural mine caves, rivers, reservoirs, high-rise buildings and other geographical environments with height differences.

[0043] When the water in the water pipe flows into the upper reservoir, a certain amount of water flows through the cooling plate of the photovoltaic panel and then flows into the reservoir. The reservoir water discharge network collects the reservoir discharge outlets with a height difference from the reservoir at the lowest altitude into a unified discharge pipe, and then drives the turbine to generate electricity. The turbine can be configured with multiple units according to the scale of power generation.

[0044] Optionally, the sewer network and the water turbine form a water transmission network, and the next-level height reservoir and the previous-level height reservoir are connected through the water transmission network.

[0045] In this embodiment, the pumped storage system takes into account the inverter function through the DC transmission and AC power generation, and can convert DC power into AC power in real time by adjusting the water transmission and discharge volume. In addition, the DC pumping unit can be adjusted according to the change of photovoltaic power generation load to avoid water hammer phenomenon, thereby avoiding the most dangerous transition process in pumped storage and improving the safety and reliability of the pumped storage process.

[0046] Optionally, the water pump power supply system also includes a land power generation system, and the water pump power supply system selects a power supply source according to water transmission power requirements.

[0047] Optionally, a DC water pump provided by floating photovoltaics is used to pump water to the upper-level reservoir, and a downpipe leads the water from the upper-level reservoir to the turbine for power generation and then to the lower-level reservoir, where the photovoltaic DC power is converted into AC power and input into the power system.

[0048] Optionally, corresponding DC pumps are configured according to the height difference of reservoirs of different levels, and the pump combination is adjusted according to the photovoltaic power generation capacity.

[0049] Optionally, as the water level of the floating photovoltaic fan-shaped floating structure decreases, the components connected to the edge of the reservoir will be unfolded, and the components between the photovoltaic panels will be closed.

[0050] Optionally, the fan-shaped floating structure of the floating photovoltaic includes deformation forms such as duck-web type, accordion type and spring type.

[0051] Optionally, the floating photovoltaic is a multi-stage photovoltaic array, a fan-shaped floating structure shore connector, a cooling water pump, a cooling plate, a floating plate, and a fan-shaped floating structure photovoltaic panel connector.

[0052] Optionally, the fan-shaped floating structure photovoltaic panel connector connects the floating panels of two adjacent photovoltaic arrays.

[0053] Among them, the floating photovoltaic includes a multi-stage photovoltaic array, a fan-shaped floating structure shore connector, a cooling water pump, a cooling plate, a floating plate, a fan-shaped floating structure photovoltaic panel connector, and the floating photovoltaic unit has a power transmission network system.

[0054] The floating photovoltaic array covers the water surface of the reservoir at a corresponding height, wherein the floating photovoltaic unit is connected to the water pump unit through a power transmission network.

[0055] The floating board of the shore connection device of the fan-shaped floating structure is connected to the edge of the reservoir, and a photovoltaic external transmission line and a cooling water inlet pipe are arranged therein.

[0056] The cooling plate is connected to the cooling water pump through a cooling water inlet pipe, and is connected to the cooling water return port and the cooling water inlet pipe of the next-level photovoltaic cooler through a cooling water outlet pipe;

[0057] The fan-shaped floating structure photovoltaic panel connector connects the floating panels of two adjacent photovoltaic arrays.

[0058] The floating board is arranged with a water surface photovoltaic transmission line, a cooling water inlet pipe, a cooling water outlet pipe, and a cooling water return port.

[0059] In this embodiment, a fan-type floating structure is adopted. As the water level changes, the cross-sectional area of ​​the water surface changes simultaneously, and the floating structure of the floating photovoltaic system automatically opens and closes, thereby ensuring that the coverage rate of the water surface remains unchanged, reducing the evaporation rate of the water body, thereby ensuring the continuous use of the photovoltaic panels and improving the power generation efficiency.

[0060] Optionally, when the water in the water pipe flows into the upper-level reservoir, a certain amount of water flows through the cooling plate of the photovoltaic panel and then flows into the reservoir.

[0061] In a specific embodiment of the present application, a closed pumped storage power generation system coupled with floating photovoltaics is provided using abandoned open-pit coal mines and their mines. The abandoned open-pit coal mines and their mines have huge open-pit pits and intricate underground structures, including multiple vertical shafts and multi-layer horizontal tunnels, and the horizontal tunnels are connected to adjacent horizontal tunnels through vertical shafts or connected to the surface open-pit pits.

[0062] Based on the characteristics of abandoned open-pit coal mines and their mine caves, this embodiment reuses them as sites for closed pumped-storage power generation systems for floating photovoltaics, while achieving abandoned coal mine management and the construction of renewable energy power generation and energy storage systems. Figure 1 , Figure 2 and Figure 3 .

[0063] Specifically, the abandoned open pit is used as an open pit reservoir 31 after pit preparation and anti-seepage treatment according to the reservoir design plan. It is connected to several horizontal tunnels through the original vertical shaft network. The preparation of the relevant vertical shaft network forms the downpipe network 1 of the open pit reservoir 31, which is connected to the tunnel reservoir 20 formed by several horizontal tunnels in the lower part of the open pit after anti-seepage treatment and reinforcement measures. The open pit reservoir 31 is connected to the downpipe network of the tunnel reservoir 20 through the up and down pipes 27 of the turbine 1 and the turbine 1 28. The water flow after power generation passes through the downpipe 30 of the turbine 1 and flows into the tunnel reservoir 20. The electricity generated by the turbine 1 28 enters the substation 44 through the transmission line 29 of the turbine 1.

[0064] Furthermore, a new water pipe network is installed in the tunnel reservoir 20, which is connected to the water pump 2 22 through the lower water pipe 21 of the water pump 2. The water pump 2 22 is driven by the power of the floating photovoltaic power supply line 25 of the water pump 2 and the land renewable photovoltaic power supply line 23 of the water pump 2, and the water of the tunnel reservoir 20 is transported to the open-pit mine reservoir 31 through the upper water pipe 24 of the water pump 2. At the same time, the floating photovoltaic 26 of the open-pit mine will automatically adjust according to the change of water level. The power of the land renewable photovoltaic power supply line 23 of the water pump 2 comes from the power of the land wind turbine 34 through the land wind turbine transmission line 33, and the power of the land photovoltaic system 35 through the land photovoltaic transmission line 47.

[0065] Furthermore, the open pit water pipe 32 and the tunnel reservoir water pipe 36 form a new water pipe network 2. The water pipe 37 is connected to the water turbine 2 40. The water turbine group control room 38 is set on the water turbine 2 40 to monitor the operation of all water turbines in the project, and the water turbine 2 transmission line 39 is set to transmit electricity to the substation 44. In addition, the water turbine 2 is connected to the lower reservoir 16 through the water pipe 41 under the water turbine 2.

[0066] Furthermore, according to the geological characteristics of the mining area, the lower reservoir 16 is built at a lower position than the seabed of the open pit by using the preparation waste and spoil dump of the open pit. The lower reservoir floating photovoltaic 43 is built on the lower reservoir 16. The power of the lower reservoir floating photovoltaic 43 drives the water pump 1 18 through the water pump 1 floating photovoltaic power supply line 42, and the water of the lower reservoir 16 flows through the water pump 1 lower water pipe 17 and the water pump 1 upper water pipe 19 to the tunnel reservoir 20.

[0067] Furthermore, the substation 44 transmits the electric power to the high-voltage power grid 46 via an external transmission line 45 .

[0068] In this embodiment, a gradient water delivery and collection mode is adopted to achieve the separation of the water delivery pipe and the sewer pipe. According to different geological conditions, a cascade layout measure of multiple reservoirs is implemented to solve the problem of inconsistency with the sewer path caused by the water delivery path bypassing the photovoltaic panels due to photovoltaic cooling. While solving the problems of water surface coverage and photovoltaic squeezing of floating photovoltaics in pumped storage, it is achieved that the pumped storage unit can cope with the randomness, volatility and intermittent changes of renewable energy systems such as solar and wind.

[0069] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0070] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A closed pumped storage power generation system coupled with floating photovoltaic, characterized in that: Applied in gradient distribution reservoir scenarios, the closed pumped storage power generation system coupled with floating photovoltaics includes a water pump power supply system, a DC water pump, a downpipe, a turbine and a power supply network; wherein, The water pump power supply system includes a floating photovoltaic system, which is used to drive the DC water pump to transport the water from the reservoir to the upper reservoir in the gradient distribution water layer. The floating photovoltaic system is a fan-shaped floating structure, which is dynamically opened and closed according to the change of the water surface cross-sectional area as the water level changes; The sewer pipe forms a sewer network, which is connected to the turbine in the upper-level reservoir. The water discharge drives the turbine to generate alternating current, which is then transmitted to the power supply network.

2. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 1, characterized in that: The sewer pipe network and the water turbine form a water transmission network, and the lower-level reservoir and the upper-level reservoir are connected through the water transmission network.

3. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 1, characterized in that: The water pump power supply system also includes a land power generation system, and the water pump power supply system selects a power supply source according to the water transmission power requirement.

4. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 1, characterized in that: The DC water pump provided by floating photovoltaics is used to pump water to the upper-level reservoir. The downpipe leads the water from the upper-level reservoir to the turbine for power generation and then to the lower-level reservoir, converting the photovoltaic DC power into AC power and inputting it into the power system.

5. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 1, characterized in that: According to the height difference of reservoirs of different levels, corresponding DC pumps are configured, and the pump combination is adjusted according to the photovoltaic power generation capacity.

6. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 1, characterized in that: As the water level of the floating photovoltaic fan-shaped floating structure decreases, the components connected to the edge of the reservoir will unfold, and the components between the photovoltaic panels will close.

7. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 1, characterized in that: The fan-shaped floating structure of the floating photovoltaic system includes deformation forms such as duck-web type, accordion type and spring type.

8. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 1, characterized in that: The floating photovoltaic is a multi-stage photovoltaic array, a fan-shaped floating structure shore connector, a cooling water pump, a cooling plate, a floating plate, and a fan-shaped floating structure photovoltaic panel connector.

9. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 8, characterized in that: The fan-shaped floating structure photovoltaic panel connector connects the floating panels of two adjacent photovoltaic arrays.

10. The closed pumped storage power generation system coupled with floating photovoltaic as claimed in claim 2, characterized in that: When the water in the water pipe flows into the upper-level reservoir, a certain amount of water flows through the cooling plate of the photovoltaic panel and then flows into the reservoir.

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