Energy production and storage system utilizing compressed air, pumped storage and PVT coupling

Abstract

The invention provides a capacity and energy storage system utilizing compressed air, pumped storage and PVT coupling, the coupling system comprises a pumped storage power generation unit, a compressed air energy storage unit and a compressed air power generation unit, and the pumped storage utilizes upper and lower water storage spaces for energy storage and power generation; an upper air storage space and a lower air storage space which are formed when the air compressor couples water pumping and power generation are used for energy storage and turbine power generation, the water pumping energy storage unit is connected with the compressed air energy storage power generation unit, the PVT photovoltaic photo-thermal reheating unit is connected with the turbine power generation unit, and an inlet of the high-pressure energy storage and air storage unit is connected with the air compressor. A gas inlet of the solar reheating unit is communicated with an outlet of the high-pressure energy and gas storage unit; the turbine power generation unit comprises a turbine communicated with a gas outlet of the solar reheating unit; and the turbine, the water pump, the water turbine and the air compressor are all electrically communicated with the PVT plate. According to the invention, the comprehensive energy production and storage utilization of local photoelectric storage and abandoned wind-solar-thermal power storage is realized, and the pumped storage of the totally-closed reservoir is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage technology, and in particular to an energy storage system utilizing compressed air, pumped storage and PVT coupling. Background Art

[0002] In order to reduce dependence on fossil energy and realize the transformation from fossil energy to clean energy, a large amount of renewable energy has become an important component of clean energy. However, a large amount of renewable energy such as solar energy, wind energy, tidal energy and other clean energy have common shortcomings, namely instability and intermittency. The real-time access of large-scale wind and solar power to the power grid will bring great challenges to the security and stability of the power grid. At this time, the unstable electricity will be stored first and then generated and connected to the grid when the power load demand increases. Therefore, how to solve the problem of absorbing wind, solar and other electricity and energy storage plays a vital role.

[0003] With the development of technology, the composite energy storage technology of pumped storage, compressed air storage and chemical storage is constantly coupled and innovated. Conventional pumped storage reservoirs have problems such as site selection and reservoir evaporation. The large amount of idle space above and below the abandoned mine and the natural height difference of the underground space provide the possibility for pumped storage, but the water and gas migration problem in the underground space leads to the reduction of pumped storage power generation efficiency. At the same time, although a large amount of underground space provides available space for compressed air energy storage, there are few multi-energy complementary energy supply systems that couple solar photovoltaic, solar thermal and hydrodynamic compressed air energy storage. When using abandoned underground space, it only simply stays on the use of a single closed space. Not only does it not make full use of a large amount of underground space, but it also does not realize the pumped compressed air energy storage and energy release process under the condition of high pumping and power generation efficiency, or a simple combination, with a single idea, lack of systematization, and incomplete conceptual design.

[0004] Therefore, it is necessary to design a production capacity storage system that can fully utilize the compressed air, pumped storage and PVT coupling of the above-ground space and a large amount of underground enclosed space, and realize the pumped compressed air energy storage and release process while solving the problem of low pumping and power generation efficiency. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a production capacity storage system that utilizes compressed air, pumped storage and PVT coupling, which can improve the utilization rate of abandoned above-ground space and underground enclosed space, while utilizing enclosed space with natural height difference to realize pumped compressed air energy storage and energy release process under the condition of high pumping and power generation efficiency, and further improve the efficiency of air energy storage on the basis of combining the use of solar energy, thereby completing the integration of renewable energy production and storage and solving the problem of reduced efficiency of pumped storage in completely enclosed space.

[0006] In order to solve the above technical problems, the present invention provides a power generation energy storage system using compressed air, pumped storage and PVT coupling, including an air compressor, a turbine, a PVT photovoltaic module, a pumped storage water pump and a hydro-generator, and also includes:

[0007] A pumped storage power generation unit comprises a first closed storage space and a second closed storage space with a height difference, air and water are stored in the first closed storage space and the second closed storage space from top to bottom, the tops of the first closed storage space and the second closed storage space are connected to an air compressor, a pumped storage water pump is connected to the first closed storage space and the second closed storage space through a pipeline, and is used to make the water in the first closed storage space be lifted by the water pump and sent to the second closed storage space for energy storage, a hydro-turbine generator is connected to the first closed space and the second closed space through a pipeline, and the height difference is used to convert hydraulic potential energy into electrical energy, and the pumped storage water pump and the hydro-turbine generator are electrically connected to the PVT photovoltaic module;

[0008] A compressed air energy storage unit, used for storing energy of high-pressure and high-temperature air outputted by an air compressor, comprising an air heat accumulator and a high-pressure air storage space, wherein a first inlet of the air heat accumulator is connected to the air compressor, a first outlet of the air heat accumulator is connected to the high-pressure air storage space, and a second inlet of the air heat accumulator is connected to the high-pressure air storage space;

[0009] The compressed air power generation unit includes a turbine, which is connected to the second outlet of the air heat accumulator and is used to allow the high-temperature and high-pressure air sent into the turbine to generate electricity through the turbine. The gas after the work is sent back to the first closed storage space or the second closed storage space respectively. The turbine is electrically connected to the PVT photovoltaic module.

[0010] Preferably, a solar reheater is also provided between the turbine and the second outlet of the air heat accumulator, the gas inlet of the solar reheater is connected to the second outlet of the air heat accumulator, the exhaust gas outlet of the turbine is respectively connected to the first closed storage space or the second closed storage space, and the medium inlet and the medium outlet of the solar reheater are both connected to the PVT photovoltaic module.

[0011] Preferably, the PVT photovoltaic assembly is electrically connected to a battery, and the battery is electrically connected to an air compressor, a turbine, a pumped-storage water pump, and a turbine generator through a power supply grid.

[0012] Preferably, the power supply grid is also connected to abandoned power.

[0013] Preferably, the turbine is an air turbine generator, which is used to expand the air fed into the turbine to perform work and thus convert mechanical energy into electrical energy.

[0014] Preferably, an air cooler is also provided between the air heat accumulator and the high-pressure air storage space, the inlet of the air cooler is connected to the first outlet of the air heat accumulator, the outlet of the air cooler is connected to the inlet of the high-pressure air storage space, and the air cooler is connected to an external refrigerant.

[0015] Preferably, the air compressor is at least one compressor, and multiple compressors are connected in series, and the number of the turbines is consistent with the number of the compressors. A first valve is provided on the pipeline connected to the hydro-generator, and a second valve for preventing water backflow is provided on the pipeline connected to the pumped-storage water pump.

[0016] Preferably, the electricity generated by the hydro-generator and the turbine is fed into the power grid.

[0017] Preferably, a multifunctional regulating valve is respectively provided on the pipeline connecting the first enclosed storage space and the air compressor, and a multifunctional regulating valve is provided on the pipeline connecting the second enclosed storage space and the air compressor. A pressure sensor is provided on both the first enclosed storage space and the second enclosed storage space. The pressure sensor is connected to a controller, and the controller is also connected to the multifunctional regulating valve for adjusting the opening of the multifunctional regulating valve by pressure.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The biggest advantage of the present invention is that it can fully develop the abandoned mines above and below ground. A large number of PVT panels can be installed on the ground, and pumped storage and air energy storage can be built in the underground space. On this basis, coupling is carried out to improve the efficiency of pumped storage and air energy storage; the photovoltaic power generated by the PVT panels can be connected to the Internet in real time according to the requirements of the power grid and can also be stored; while the PVT panels generate electricity, they generate a large amount of light and heat which can be directly used in the reheating process of air compression, thereby improving the efficiency of air energy storage and the utilization rate of clean green energy.

[0020] 2. The present invention realizes the fully enclosed upper and lower reservoir form of pumped storage and couples the advantages of pumped storage and compressed air energy storage, thereby improving the efficiency of pumped storage. The original pumped storage, especially the fully underground pumped storage that utilizes abandoned space, is different from the conventional open upper and lower reservoirs. Since there is a large amount of air in the enclosed space of the upper and lower reservoirs, the pressure generated by the compressed air in the internal enclosed space of the upper reservoir acts on the water body during pumping, reducing the efficiency of the water pump. When generating electricity, the air compression in the enclosed space of the lower reservoir will reduce the power generation efficiency of the turbine. When the present invention is pumping water, a large amount of low-pressure air compressed in the upper space of the upper reservoir is extracted, compressed into high-pressure air by an air compressor, and then enters the lower reservoir after passing through a turbine to do work. While completing the air energy storage and release process, a similar open space is given to the upper and lower reservoirs, or a pressure greater than the open space is given to the lower reservoir, thereby improving the pumped storage efficiency. When generating electricity, the air in the closed space of the lower reservoir is compressed, and then a large amount of compressed low-pressure air is extracted and compressed into high-pressure air, and the high-pressure air is reheated and then passes through a turbine to generate electricity and do work, and then enters the upper reservoir, completing the air energy storage and release process again, and simultaneously providing a similar open space to the upper and lower reservoirs, or a pressure greater than the open space is given to the lower reservoir, thereby improving the power generation efficiency of the turbine.

[0021] 3. The present invention realizes a storage mode that coordinates the storage of system capacity and the storage of external network abandoned electricity on the premise of system capacity;

[0022] 4. The present invention realizes all-underground pumped storage and improves the efficiency of pumped storage;

[0023] 5. The present invention realizes the utilization of abandoned underground and above-ground space and provides a more economical use method;

[0024] 6. The present invention improves the energy density of energy storage, reduces the reservoir capacity, reduces the height difference of the reservoir, and reduces the economic cost of pumped storage and compressed air energy storage construction;

[0025] 7. The present invention realizes energy production and energy storage while achieving energy self-consistency within the system, completely realizing zero energy utilization and zero carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the energy storage system of the present invention using compressed air, pumped storage and PVT coupling.

[0027] Description of reference numerals:

[0028] 1. First closed storage space; 2. Second closed storage space; 3. Air compressor; 4. Turbine; 5. Solar reheat unit; 6. Air heat accumulator; 7. Air cooler; 8. High-pressure air storage space; 9. Solar PVT panel; 10. Battery; 11. Hydro generator; 12. Pumped storage pump; 13. Valve; 14. Pressure sensor; 15. Multi-function regulating valve DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions 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 in the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] The inventors found that the existing pumped air compression only ensures the efficiency of compressed air in one space while reducing the efficiency of pumped storage, but does not consider the full utilization of the abandoned underground space, the natural height difference between the upper and lower closed spaces, the pressure conversion problem of the closed space between pumped storage power generation and air energy storage power generation, and the utilization of the ground space.

[0031] In view of this, the present invention utilizes the natural height difference between the above-ground and underground abandoned spaces and the underground enclosed spaces, and ensures the high efficiency of pumped storage while ensuring the energy storage efficiency of the compressed space.

[0032] like Figure 1 As shown, the present invention provides a power generation energy storage system using compressed air, pumped storage and PVT coupling, including a PVT photovoltaic module 9, an air compressor 3, a turbine 4, a pumped storage water pump 12 and a hydro-generator 11, wherein the solar heat extraction end of the present invention adopts a PVT integrated solar panel, which can generate electricity and prepare hot water at the same time, and can adjust the power generation-hot water ratio and the laying area according to the heat load and the power load calculation. The PVT photovoltaic module 9 and the air compressor 3 are electrically connected, and green energy-photothermal energy is used in the process of compressing air to maximize the efficiency of the compressed air energy storage system, and also includes:

[0033] Pumped storage power generation unit, comprising:

[0034] The first closed storage space 1 stores air and water from top to bottom, and the top is connected to the air compressor 3;

[0035] The second closed storage space 2 stores air and water in sequence from top to bottom. The top is connected to the air compressor 3, and the bottom is connected to the first closed storage space 1 through pipelines and pumped-storage water pumps 12 as well as pipelines and hydro-turbine generators 11. There is a height difference between the first closed storage space 1 and the second closed storage space 2. The water in the first closed storage space 1 is lifted by the water pump 12 and then sent to the second closed storage space 2 for energy storage. The pumped-storage water pump 12 is also electrically connected to the PVT photovoltaic module 9; the hydro-turbine generator 11 utilizes the height potential energy of the height difference between the first closed storage space 1 and the second closed storage space 2 and the air pressure energy of the gas inside the second closed storage space 2 after doing work to release energy and generate electricity. The hydro-turbine generator 11 is electrically connected to the PVT photovoltaic module 9.

[0036] A compressed air energy storage unit, used for storing heat and energy of high-pressure and high-temperature air output by the air compressor 3, comprises an air heat accumulator 6 and a high-pressure air storage space 8, wherein a first inlet of the air heat accumulator 6 is connected to the air compressor 3, a first outlet of the air heat accumulator 6 is connected to the high-pressure air storage space 8, and a second inlet of the air heat accumulator 6 is connected to the high-pressure air storage space 8;

[0037] The compressed air power generation unit includes a turbine 4, which is connected to the second outlet of the air heat accumulator 6. The high-temperature and high-pressure air fed into the turbine 4 performs work to generate electricity through the turbine 4, and the gas after the work is respectively sent back to the first closed storage space 1 or the second closed storage space 2. The turbine 4 is electrically connected to the PVT photovoltaic module 9.

[0038] The functions of the air heat accumulator 6 are energy storage and energy release. The air heat accumulator 6 contains a heat storage medium. The compression heat discharged from the air compressor outlet is recovered through the air heat accumulator 6, and the air that releases heat is stored in the high-pressure air storage space 8. During the energy release process, the air discharged from the high-pressure air storage space 8 is reheated through the air heat accumulator 6 and sent to the turbine 4 to generate electricity.

[0039] The present invention is based on the existing principles of electricity storage and power generation. It mainly solves the problems of solar energy utilization, energy storage of abandoned wind, solar and thermal power, coupling of pumped storage and compressed air energy storage, and utilizing a large amount of solar heat generated during photovoltaic production before air energy release for power generation to improve the energy storage efficiency of the system, achieving comprehensive production capacity storage utilization of local photovoltaic storage and energy storage of abandoned wind, solar and thermal power, and realizing pumped storage in a fully enclosed reservoir; the self-consumption of green electricity within the system realizes internal energy self-consistency, achieves zero carbon emissions, and achieves the goal of carbon reduction.

[0040] Pumped storage, especially fully underground pumped storage using abandoned space, is different from conventional open upper and lower reservoirs. Since there is a large amount of air in the closed space of the first closed storage space 1 and the second closed storage space 2, when pumping water, the pressure generated by the compressed air in the closed space of the second closed storage space 2 acts on the water body to reduce the efficiency of the water pump. When generating electricity, the air compression in the closed space of the first closed storage space 1 will reduce the power generation efficiency of the turbine.

[0041] When the present invention is pumping water, a large amount of compressed low-pressure air in the upper space of the first closed storage space 1 is extracted and compressed into high-pressure air, and the high-pressure air is reheated and passed through the turbine 4. The exhaust gas after the turbine 4 generates electricity enters the second closed storage space 2. While completing the air energy storage and release process, the first closed storage space 1 and the second closed storage space 2 are given a similar open space to improve the pumped storage efficiency, or the pressure of the first closed storage space 1 is slightly higher than the space pressure of the open pumping space to improve the pumped storage efficiency. When generating electricity, the air in the first closed storage space 1 is compressed, and then a large amount of compressed low-pressure air is extracted and compressed into high-pressure air, and the high-pressure air is reheated and passed through the turbine 4 to generate electricity and work before entering the second closed storage space 2, completing the air energy storage and release process again, and at the same time, the first closed storage space 1 and the second closed storage space 2 are given a similar open space, or the second closed storage space 2 is given a pressure greater than the open space to improve the power generation efficiency of the turbine.

[0042] A large number of PVT photovoltaic modules 9 can be installed in abandoned ground space. The photovoltaic power generated by the PVT panels can be connected to the Internet in real time or stored according to the requirements of the power grid; a large amount of solar heat can be generated and directly used in the reheating process of air compression, thereby improving the air energy storage efficiency and the utilization rate of green energy.

[0043] Specifically, a solar reheater 5 is provided between the turbine 4 and the second outlet of the air heat accumulator 6, the gas inlet of the solar reheater 5 is connected to the second outlet of the air heat accumulator 6, the exhaust gas outlet of the turbine 4 is connected to the first closed storage space 1 and the second closed storage space 2 respectively, and the medium inlet and the medium outlet of the solar reheater 5 are both connected to the PVT photovoltaic module 9. The gas sent out from the second outlet of the air heat accumulator 6 is sent to the solar reheater 5 again for heating, in order to adjust the inlet temperature of the turbine 4 and increase the reheating temperature to improve the efficiency of the work of the turbine 4.

[0044] Specifically, the PVT photovoltaic module 9 is electrically connected to a battery 10, and the battery 10 is electrically connected to the air compressor 3, the turbine 4, the turbine 11 and the pumped-storage water pump 12 through the power supply grid, respectively. Chemical energy storage batteries are used to solve the comprehensive and efficient utilization of photovoltaic energy and abandoned wind, solar and thermal power storage.

[0045] Specifically, the power supply grid is also connected to the abandoned power for storing the abandoned wind, solar and thermal power.

[0046] Specifically, the turbine 4 is an air turbine, which is used to expand the air fed into the turbine 4 to perform work, and then convert the mechanical energy into electricity to enter the power grid.

[0047] Specifically, an air cooler 7 is further provided between the air accumulator 6 and the high-pressure air storage space 8. The inlet of the air cooler 7 is communicated with the first outlet of the air accumulator 6, the outlet of the air cooler 7 is communicated with the inlet of the high-pressure air storage space 8, and the air cooler 7 is connected to an external refrigerant. The air is compressed again by the air compressor 3, and the heat released during the compression process is stored in the air accumulator 6, and then cooled by the air cooler 7, so as to ensure that the pressure of the air entering the high-pressure air storage space 8 is constant. The high-pressure air sent out from the high-pressure air storage space 8 passes through the air accumulator 6, and then the stored compression heat is released to the high-pressure air.

[0048] Specifically, the air compressor 3 is at least one compressor, and multiple compressors are connected in series, and the number of the expanders 4 is consistent with the number of the compressors. A first valve is provided on the pipeline connected to the hydro-generator 11, and a second valve 13 for preventing water backflow is provided on the pipeline connected to the pumped-storage water pump 12.

[0049] Specifically, the electricity generated by the hydro-generator 11 and the turbine 4 is connected to the power grid and used to generate electricity and connect to the grid when needed.

[0050] Specifically, a multifunctional regulating valve 15 is respectively provided on the pipeline connecting the first enclosed storage space 1 and the air compressor 3, and a multifunctional regulating valve 15 is respectively provided on the pipeline connecting the second enclosed storage space 2 and the air compressor 3. A pressure sensor 14 is provided on both the first enclosed storage space 1 and the second enclosed storage space 2. The pressure sensor 14 is connected to a controller, and the controller is also connected to the multifunctional regulating valve 15 for adjusting the opening of the multifunctional regulating valve 15 by pressure. An intelligent joint control of the first enclosed storage space 1 and the second enclosed storage space 2 is designed to maximize the energy storage efficiency of the overall pumped storage system.

[0051] The first enclosed storage space 1 and the second enclosed storage space 2 provided in the present invention are both intelligently controlled with the air compressor 3, which automatically adjusts the low-pressure air storage space of the first enclosed storage space 1 to be connected during pumping and the low-pressure air storage space of the second enclosed storage space 2 to be connected during power generation; the first enclosed storage space 1 and the second enclosed storage space 2 are both intelligently controlled with the turbine 4, which automatically adjusts the connection between the second enclosed storage space 2 during pumping and the connection between the first enclosed storage space 1 during power generation according to the pumping and power generation links, thereby improving the overall system efficiency of the pumped storage energy storage.

[0052] The present invention utilizes the multifunctional regulating valve 15 to pressurize and depressurize the gas pressure in the first closed storage space 1 and the second closed storage space 2 to ensure that the pressure in the first closed storage space 1 and the second closed storage space 2 is constant.

[0053] In order to ensure the efficiency of pumped storage energy storage and power generation, the pressure of the first closed storage space 1 and the second closed storage space 2 are adjusted to ensure that the pressure of the second closed storage space 2 is equal to or slightly less than the atmospheric pressure and the pressure of the upper space of the first closed storage space 1 is equal to or slightly greater than the atmospheric pressure when pumping; when generating electricity, the air pressure above the first closed storage space 1 is equal to or slightly less than the atmospheric pressure and the air pressure above the second closed storage space 2 is equal to or slightly greater than the atmospheric pressure.

[0054] The present invention provides a compressed air-pumped storage-solar energy coupling capacity-energy storage energy coupling system based on PVT solar panels, which integrates the capacity and energy storage of photovoltaic power generation, solar thermal, pumped storage, compressed air energy storage, and solar thermal reheating systems. It not only solves its own capacity and energy storage, but also couples with the storage and access to the Internet of wind, solar, and thermal power in the external network, and maximizes the use of abandoned space to improve the efficiency of capacity and energy storage.

[0055] The solar PVT panels 9 on the ground absorb solar radiation, generating photovoltaic power and a large amount of solar heat at the same time. When the photovoltaic power cannot be connected to the Internet, the large amount of photovoltaic power is stored in the underground pumped storage system and compressed air system, and the solar heat is reheated in the compressed air; the pumped storage and compressed air energy storage systems also store a large amount of abandoned wind, solar and thermal power, and connect to the Internet during peak electricity prices. The system also matches and stores self-produced photovoltaic power with abandoned wind, solar and thermal power from the external network.

[0056] 1) Pumped storage process A: When pumping water, the water pump 12 operates to transport the water in the lower space 1 to the upper water storage space 2. When generating electricity, the water in the upper space generates electricity through the turbine 11 under the combined action of the height potential energy and the air pressure energy;

[0057] 2) Compressed air energy storage process B:

[0058] When B1 is pumping water, the water pump runs to transport the water in the first closed storage space 1 to the second closed storage space 2. At the same time, the air in the upper part of the second closed storage space 2 is compressed into low-pressure air, compressed by the air compressor 3, and then stored in the air heat accumulator 6 to release the heat in the compression process and then sent to the air cooler 7. The purpose is to ensure that the pressure of the air entering the high-pressure air storage space 8 is constant. The high-pressure gas in the high-pressure air storage space 8 absorbs heat in the air heat accumulator 6 and then passes through the solar reheater 5 to enter the turbine 4 for power generation. At the same time, the exhaust gas from the turbine enters the upper part of the first closed storage space 1.

[0059] When B2 generates electricity, the water in the lower part of the second closed storage space 2 passes through the hydro-generator 11 to generate electricity, the water storage space of the first closed storage space 1 increases, and the air in the gas storage space of the first closed storage space 1 is compressed into low-pressure air, which is compressed again by the air compressor 3, passes through the air heat accumulator 6 and then the air cooler 7 to enter the high-pressure air storage space 8, and the high-pressure gas 8 passes through the air heat accumulator 6 and then the solar reheating unit 5 and enters the turbine 4 to generate electricity, and at the same time, the exhaust gas passing through the turbine 4 enters the upper space of the second closed storage space 2;

[0060] 3) Air cooler cooling process C: The air coming out of the air heat accumulator 6 is cooled by the air cooler 7 to ensure that the pressure of the air entering the high-pressure air storage space 8 is constant;

[0061] 4) Solar reheating process D: The solar PVT panel 9 absorbs solar energy, generates photovoltaic power and generates three times the amount of photothermal energy. A large amount of photothermal energy can be used to heat the high-pressure air before entering the turbine, thereby improving the power generation efficiency.

[0062] 5) Photovoltaic power supply process E: The storage battery 10 can be used for internal power applications of the system and ensure the safety and stability of the system's power consumption, and can also coordinate the external power supply and the energy storage of the system;

[0063] 6) Energy storage output process G: The system capacity is the sum of three parts, pumped storage power generation, compressed air turbine power generation and PVT panel power generation, which are connected to the external power grid.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A power generation energy storage system utilizing compressed air, pumped storage and PVT coupling, comprising an air compressor (3), a turbine (4), a PVT photovoltaic module (9), a pumped storage water pump (12) and a hydroelectric generator (11), characterized in that: Also includes: A pumped storage power generation unit comprises a first closed storage space (1) and a second closed storage space (2) with a height difference, wherein air and water are stored in the first closed storage space (1) and the second closed storage space (2) from top to bottom, the tops of the first closed storage space (1) and the second closed storage space (2) are connected to an air compressor (3), a pumped storage water pump (12) is connected to the first closed storage space (1) and the second closed storage space (2) through a pipeline, and is used to make the water in the first closed storage space (1) be lifted by the water pump (12) and then sent to the second closed storage space (2) for energy storage, a hydro-turbine generator (11) is connected to the first closed space (1) and the second closed space (2) through a pipeline, and uses the height difference to convert hydraulic potential energy into electrical energy, and the pumped storage water pump (12) and the hydro-turbine generator (11) are electrically connected to a PVT photovoltaic module (9); A compressed air energy storage unit, used for storing energy of high-pressure and high-temperature air output by an air compressor (3), comprising an air heat accumulator (6) and a high-pressure air storage space (8), wherein a first inlet of the air heat accumulator (6) is connected to the air compressor (3), a first outlet of the air heat accumulator (6) is connected to the high-pressure air storage space (8), and a second inlet of the air heat accumulator (6) is connected to the high-pressure air storage space (8); A compressed air power generation unit comprises a turbine (4), wherein the turbine (4) is connected to a second outlet of an air heat accumulator (6) and is used to allow high-temperature and high-pressure air fed into the turbine (4) to generate power through the turbine (4), and the gas after the work is respectively sent back to a first enclosed storage space (1) or a second enclosed storage space (2), and the turbine (4) is electrically connected to a PVT photovoltaic module (9).

2. The energy storage system using compressed air, pumped storage and PVT coupling according to claim 1 is characterized in that: A solar reheater (5) is also provided between the turbine (4) and the second outlet of the air heat accumulator (6); the gas inlet of the solar reheater (5) is connected to the second outlet of the air heat accumulator (6); the exhaust gas outlet of the turbine (4) is respectively connected to the first closed storage space (1) or the second closed storage space (2); the medium inlet of the solar reheater (5) and the medium outlet of the solar reheater (5) are both connected to the PVT photovoltaic module (9).

3. The energy storage system using compressed air, pumped storage and PVT coupling according to claim 1 is characterized in that: The PVT photovoltaic module (9) is electrically connected to a storage battery (10), and the storage battery (10) is electrically connected to an air compressor (3), a turbine (4), a pumped storage water pump (12), and a water turbine generator (11) through a power supply grid.

4. The energy storage system using compressed air, pumped storage and PVT coupling according to claim 3 is characterized in that: The power supply grid is also connected to abandoned power.

5. The energy storage system using compressed air, pumped storage and PVT coupling according to claim 1 is characterized in that: The turbine (4) is an air turbine generator, which is used to expand the air fed into the turbine (4) to perform work and thereby convert mechanical energy into electrical energy.

6. The energy storage system using compressed air, pumped storage and PVT coupling according to claim 1 is characterized in that: An air cooler (7) is also provided between the air heat accumulator (6) and the high-pressure air storage space (8); the inlet of the air cooler (7) is connected to the first outlet of the air heat accumulator (6); the outlet of the air cooler (7) is connected to the inlet of the high-pressure air storage space (8); and the air cooler (7) is connected to an external refrigerant.

7. The energy storage system utilizing compressed air, pumped storage and PVT coupling according to claim 1 is characterized in that: The air compressor (3) is at least one compressor, and a plurality of compressors are connected in series, and the number of the turbines (4) is the same as the number of the compressors. A first valve is provided on the pipeline connected to the hydro-generator (11), and a second valve (13) for preventing water from flowing back is provided on the pipeline connected to the pumped storage water pump (12).

8. The energy storage system utilizing compressed air, pumped storage and PVT coupling according to claim 2 is characterized in that: The electricity generated by the water turbine generator (11) and the turbine (4) is fed into the power grid.

9. The energy storage system utilizing compressed air, pumped storage and PVT coupling according to claim 1 is characterized in that: A multifunctional regulating valve (15) is provided on the pipeline connecting the first enclosed storage space (1) and the air compressor (3) and the pipeline connecting the second enclosed storage space (2) and the air compressor (3), respectively. A pressure sensor (14) is provided on both the first enclosed storage space (1) and the second enclosed storage space (2). The pressure sensor (14) is connected to a controller, and the controller is also connected to the multifunctional regulating valve (15) for regulating the opening of the multifunctional regulating valve (15) by pressure.

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