Photovoltaic photo-thermal heat compensation type compressed air energy storage power generation system

Abstract

The invention relates to a photovoltaic photo-thermal heat compensation type compressed air energy storage power generation system which comprises a photovoltaic power generation device, a compressed air energy storage module, a photo-thermal heat compensation module and an expansion energy release power generation module. The photovoltaic power generation device converts solar energy into electric energy and transmits the electric energy to the power grid or the compressed air energy storage module. The compressed air energy storage module converts electric energy into mechanical energy and heat energy and stores the mechanical energy and the heat energy; the photo-thermal heat compensation module converts solar energy into heat energy and stores the heat energy; the expansion energy release power generation module is connected with the compressed air energy storage module and the photo-thermal heat compensation module and used for doing work to generate power based on the mechanical energy and the heat energy so as to transmit generated electric energy to a power grid. Photovoltaic photo-thermal energy storage and energy release power generation decoupling operation is adopted, the impact of photovoltaic power generation intermittence and discontinuity on a power grid is effectively relieved, the operation mode is flexible, stable and adjustable friendly electric energy can be provided and transmitted to the power grid, the utilization efficiency of new energy is improved, and the stability of the power grid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy storage, and more specifically, to a photovoltaic light-thermal heat-compensation type compressed air energy storage power generation system. Background Art

[0002] Solar power generation technology mainly includes photovoltaic power generation technology and solar thermal power generation technology. Photovoltaic power generation directly converts solar energy into electrical energy through the photoelectric effect. Solar thermal power generation converts solar energy into thermal energy, and then converts thermal energy into electrical energy through heat-to-work conversion. Compressed air energy storage is an energy storage technology based on the principle of gas turbine technology. When there is surplus electricity, the air is compressed into high-pressure air and stored in a gas tank by an electric drive compressor. When there is a lack of electricity, the high-pressure air in the gas tank is released to drive the expander to generate electricity.

[0003] The output power of photovoltaic power generation is very unstable, intermittent and discontinuous. Large-scale access has a great impact on the power grid. Therefore, the construction of photovoltaic power stations needs to be equipped with a high-cost power storage system to compensate for the impact and damage caused by its intermittent and discontinuous nature on the power grid. Most solar thermal energy storage power generation uses molten salt as a storage medium to convert solar energy into thermal energy, which is stored in high molten salt. The high-temperature molten salt heats water to become steam, and the steam drives the turbine to generate electricity. This method has high investment costs and low efficiency. The most advanced compressed air energy storage currently uses a non-supplementary combustion type, which converts the surplus power of the power grid into compressed potential energy, stores it in compressed air, and drives the expander to generate electricity when needed. However, due to the lack of supplementary heat, the expander intake parameters are low and the efficiency is also low. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a photovoltaic thermal heating type compressed air energy storage power generation system in response to the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: construct a photovoltaic light-thermal heating type compressed air energy storage power generation system, including: a photovoltaic power generation device, a compressed air energy storage module, a light-thermal heating module and an expansion energy release power generation module;

[0006] The photovoltaic power generation device is used to convert solar energy into electrical energy, and transmit the electrical energy to the power grid or transmit the electrical energy to the compressed air energy storage module;

[0007] The compressed air energy storage module is connected to the photovoltaic power generation device and is used to convert the electrical energy into mechanical energy and thermal energy and store them;

[0008] The photothermal heat supplement module is connected to the compressed air energy storage module and is used to convert solar energy into thermal energy and store it;

[0009] The expansion energy-release power generation module is connected to the compressed air energy storage module and the photothermal heat supplement module, and is used to generate electricity based on the mechanical energy and thermal energy, so as to transmit the generated electrical energy to the power grid.

[0010] In the photovoltaic-thermal heat-compensation type compressed air energy storage power generation system described in the present invention, the compressed air energy storage module includes: a pressure storage circuit and a heat storage circuit;

[0011] The pressure storage circuit is used to convert the electrical energy into mechanical energy and store it;

[0012] The heat storage circuit is used to convert the electrical energy into thermal energy and store it.

[0013] In the photovoltaic-thermal heat-compensation type compressed air energy storage power generation system described in the present invention, the compression storage circuit includes: a compressor, a first heat exchanger and an air storage tank;

[0014] The compressor is connected to the photovoltaic power generation device, and is used to compress air according to the electric energy generated by the photovoltaic power generation device, and transmit the high-pressure air to the air storage tank through the first heat exchanger;

[0015] The air storage tank is used to store the high-pressure air;

[0016] The high-pressure air is the mechanical energy;

[0017] The cold salt tank is used to store low-temperature molten salt;

[0018] The hot salt tank is used to store high-temperature molten salt.

[0019] In the photovoltaic-thermal heat-compensation type compressed air energy storage power generation system described in the present invention, the heat storage circuit includes: the compressor, the first heat exchanger, the collector, the cold salt tank and the hot salt tank;

[0020] The cold salt tank is used to store low-temperature molten salt to provide low-temperature molten salt to the first heat exchanger;

[0021] The compressor is used to compress the electric energy generated by the photovoltaic power generation device into air;

[0022] The first heat exchanger is connected to the compressor and is used to absorb the heat generated during the compression process of the compressor and store it in the hot salt tank after passing through the collector;

[0023] The heat collector is used to transmit the first heat exchanger and the absorbed heat energy;

[0024] The hot salt tank is used to store high-temperature molten salt so as to store the heat energy absorbed by the first heat exchanger through the high-temperature molten salt.

[0025] In the photovoltaic-thermal heat-compensation type compressed air energy storage power generation system described in the present invention, the first heat exchanger is an air molten salt heat exchanger;

[0026] The air molten salt heat exchanger is used to absorb the heat generated by the compressor during the process of compressing air.

[0027] In the photovoltaic light-thermal heating type compressed air energy storage power generation system described in the present invention, the expansion energy release power generation module includes: an energy release power generation circuit;

[0028] The energy-releasing power generation circuit is used to generate power by doing work according to the mechanical energy and the thermal energy, and transmit the generated electric energy to the power grid.

[0029] In the photovoltaic-thermal heat-compensation type compressed air energy storage power generation system described in the present invention, the energy-release power generation circuit includes: the cold salt tank, the hot salt tank, the gas storage tank, the second heat exchanger and the expansion generator set;

[0030] The air storage tank is used to store the high-pressure air;

[0031] The hot salt tank is used to store high-temperature molten salt and release heat through the second heat exchanger to heat the high-pressure air;

[0032] The cold salt tank is used to store low-temperature molten salt;

[0033] The second heat exchanger is connected to the hot salt tank, the cold salt tank and the gas storage tank respectively, and is used to absorb the heat released by the high-temperature molten salt stored in the hot salt tank to increase the temperature of the high-pressure air output by the gas storage tank to obtain high-temperature compressed air;

[0034] The expansion generator set is connected to the second heat exchanger and is used to generate electricity according to the work of the high-temperature compressed air, so as to send the generated electric energy to the power grid.

[0035] In the photovoltaic-thermal heat-compensation type compressed air energy storage power generation system described in the present invention, the second heat exchanger is a molten salt-air heat exchanger;

[0036] The molten salt air heat exchanger is used to absorb the heat released by the high-temperature molten salt to increase the temperature of the high-pressure air and obtain the high-temperature compressed air.

[0037] In the photovoltaic thermal heat compensation type compressed air energy storage power generation system described in the present invention, the thermal heat compensation module includes: a thermal heat compensation circuit; the thermal heat compensation circuit includes: the collector and the hot salt tank, the cold salt tank, and the first heat exchanger; the collector, the hot salt tank, the cold salt tank, and the first heat exchanger constitute the thermal heat compensation circuit;

[0038] The thermal collector is used to absorb solar energy and convert the solar energy into thermal energy;

[0039] The hot salt tank is used to store high-temperature molten salt so as to store the thermal energy absorbed by the collector through the high-temperature molten salt.

[0040] The photovoltaic light-thermal heating type compressed air energy storage power generation system of the present invention comprises:

[0041] Photovoltaic energy storage operation mode, the photovoltaic energy storage operation mode is: converting solar energy into electrical energy, driving the compressor with the generated electrical energy, and storing the mechanical energy and thermal energy generated during the air compression process;

[0042] Solar thermal energy storage operation mode, the solar thermal energy storage operation mode is: converting solar energy into thermal energy, heating molten salt by the thermal energy, and storing the generated heat;

[0043] The expansion energy-releasing power generation operation mode is as follows: after the stored compressed air absorbs the heat of the hot molten salt, the expanded generator set is used to generate electricity;

[0044] Photovoltaic power generation grid-connected operation mode, the photovoltaic power generation grid-connected operation mode is: the electric energy generated by photovoltaic power generation is transmitted to the power grid;

[0045] The grid electric energy storage operation mode is as follows: storing grid electric energy;

[0046] Photovoltaic thermal energy storage and expansion energy release power generation operation mode, the photovoltaic thermal energy storage and expansion energy release power generation operation mode is: the photovoltaic thermal energy storage mode and the expansion energy release power generation operation mode are executed in parallel.

[0047] The photovoltaic and thermal heat-compensating compressed air energy storage power generation system implemented in the present invention has the following beneficial effects: including: a photovoltaic power generation device, a compressed air energy storage module, a thermal heat-compensating module, and an expansion energy-release power generation module; the photovoltaic power generation device converts solar energy into electrical energy, and transmits the electrical energy to the power grid or the compressed air energy storage module; the compressed air energy storage module converts electrical energy into mechanical energy and thermal energy and stores it; the thermal heat-compensating module converts solar energy into thermal energy and stores it; the expansion energy-release power generation module is connected to the compressed air energy storage module and the thermal heat-compensating module, and is used to generate electricity based on mechanical energy and thermal energy to transmit the generated electrical energy to the power grid. The present invention adopts the decoupled operation of photovoltaic and thermal energy storage and energy-release power generation, which effectively alleviates the impact of intermittent and discontinuous photovoltaic power generation on the power grid, has a flexible operation mode, and can provide stable and adjustable friendly electrical energy to the power grid, which not only improves the utilization efficiency of new energy but also improves the stability of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0049] Figure 1 This is a principle block diagram of the photovoltaic light-thermal heating type compressed air energy storage power generation system provided by the present invention;

[0050] Figure 2 It is a schematic diagram of the main equipment connections of the photovoltaic thermal compensation type compressed air energy storage power generation system provided by the present invention. DETAILED DESCRIPTION

[0051] 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 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 are within the scope of protection of the present invention.

[0052] refer to Figure 1 , Figure 1 This is a schematic diagram of the photovoltaic thermal heating type compressed air energy storage power generation system provided by the present invention.

[0053] Specifically, Figure 1 As shown, the photovoltaic-thermal heating type compressed air energy storage power generation system includes: a photovoltaic power generation device, a compressed air energy storage module, a photothermal heating module and an expansion energy release power generation module.

[0054] Among them, the photovoltaic power generation device is used to convert solar energy into electrical energy, and transmit the electrical energy to the power grid or transmit the electrical energy to the compressed air energy storage module; the compressed air energy storage module is connected to the photovoltaic power generation device, and is used to convert the electrical energy into mechanical energy and thermal energy and store it; the photothermal heat compensation module is connected to the compressed air energy storage module, and is used to convert solar energy into thermal energy and store it; the expansion energy release power generation module is connected to the compressed air energy storage module and the photothermal heat compensation module, and is used to generate electricity based on the mechanical energy and thermal energy to transmit the generated electrical energy to the power grid.

[0055] Optionally, in an embodiment of the present invention, the compressed air energy storage module includes: a pressure storage circuit and a heat storage circuit; the pressure storage circuit is used to convert the electrical energy into mechanical energy and store it; the heat storage circuit is used to convert the electrical energy into thermal energy and store it.

[0056] refer to Figure 2 , Figure 2 A schematic diagram of the connection of the main equipment of the photovoltaic thermal heating type compressed air energy storage power generation system provided by the present invention.

[0057] Figure 2In the figure, ① represents a photovoltaic power generation device, ② represents a compressor, ③ represents an air-molten salt heat exchanger, ④ represents a collector, ⑤ represents a hot salt tank, ⑥ represents a cold salt tank, ⑦ represents a gas storage tank (or gas storage reservoir), ⑧ represents a molten salt-air heat exchanger, ⑨ represents an expansion generator set, and ⑩ represents a power grid.

[0058] Specifically, Figure 2 As shown, in an embodiment of the present invention, the pressure storage circuit includes: a compressor, a first heat exchanger and an air storage tank; the compressor is connected to the photovoltaic power generation device, and is used to compress air according to the electric energy generated by the photovoltaic power generation device, and transmit the high-pressure air to the air storage tank through the first heat exchanger; the air storage tank is used to store the high-pressure air; the high-pressure air is the mechanical energy.

[0059] The heat storage circuit includes: the compressor, the first heat exchanger, a collector, a cold salt tank and a hot salt tank; the cold salt tank is used to store low-temperature molten salt to provide low-temperature molten salt to the first heat exchanger; the compressor is used to compress the electric energy generated by the photovoltaic power generation device into air; the first heat exchanger is connected to the compressor, and is used to absorb the heat generated by the compression process of the compressor, and store it in the hot salt tank after passing through the collector; the collector is used to transmit the first heat exchanger and the absorbed heat energy; the hot salt tank is used to store high-temperature molten salt to store the heat energy absorbed by the first heat exchanger through the high-temperature molten salt.

[0060] It should be noted that in the compression energy storage process (i.e. the process of compressing and storing mechanical energy and thermal energy), the compression storage circuit and the heat storage circuit share the cold salt tank and the hot salt tank. At the same time, the collector can be used as a heat transfer path and can also be used as a heat collection conversion device, that is, converting solar energy into thermal energy to achieve the function of photothermal heat compensation.

[0061] Optionally, in an embodiment of the present invention, the first heat exchanger is an air molten salt heat exchanger; the air molten salt heat exchanger is used to absorb the heat generated by the compressor during the process of compressing air. Among them, the cold salt tank provides low-temperature molten salt to the first heat exchanger so that the first heat exchanger can absorb the heat generated during the compression process, and transmit it to the hot salt tank after passing through the collector, and the hot salt tank stores the stored heat. Specifically, after the low-temperature molten salt in the cold salt tank passes through the air molten salt heat exchanger, the air molten salt heat exchanger absorbs the heat generated by the compressor during the air compression process, increases the temperature of the molten salt, and the molten salt flows through the collector to absorb solar energy to further increase the temperature of the molten salt (if there is sun), and finally stores the high-temperature molten salt in the hot salt tank.

[0062] In the embodiment of the present invention, the photothermal heat supplementation module includes: a photothermal heat supplementation circuit. Specifically, Figure 2As shown, the solar thermal heat supplementation circuit includes: the solar collector and the hot salt tank, the cold salt tank, and the first heat exchanger. The solar thermal heat supplementation circuit is composed of the solar thermal collector, the hot salt tank, the cold salt tank, and the first heat exchanger.

[0063] The collector is used to absorb solar energy and convert the solar energy into thermal energy; the hot salt tank is used to store high-temperature molten salt to store the thermal energy absorbed by the collector through the high-temperature molten salt.

[0064] In an embodiment of the present invention, the expansion energy-releasing power generation module comprises: an energy-releasing power generation circuit; the energy-releasing power generation circuit is used to generate power by performing work according to the mechanical energy and the thermal energy, and transmit the generated electric energy to the power grid.

[0065] like Figure 2 As shown, the energy-releasing power generation circuit includes: the cold salt tank, the hot salt tank, the gas storage tank, the second heat exchanger and the expansion generator set.

[0066] The gas tank is used to store the high-pressure air; the hot salt tank is used to store high-temperature molten salt and releases heat through the second heat exchanger to heat the high-pressure air; the cold salt tank is used to store low-temperature molten salt; the second heat exchanger is respectively connected to the hot salt tank, the cold salt tank and the gas tank, and is used to absorb the heat released by the high-temperature molten salt stored in the hot salt tank to increase the temperature of the high-pressure air output by the gas tank to obtain high-temperature compressed air; the expansion generator set is connected to the second heat exchanger, and is used to generate electricity according to the work done by the high-temperature compressed air to send the generated electricity to the power grid.

[0067] Depend on Figure 2 It can be seen that in the embodiment of the present invention, the modules of each loop are shared or used independently to form a whole, thereby achieving multiple operating modes.

[0068] like Figure 2 As shown, the cold salt tank is connected to the air molten salt heat exchanger and the molten salt air heat exchanger respectively. After the low-temperature molten salt in the cold salt tank flows through the air molten salt heat exchanger, the air molten salt heat exchanger absorbs the heat generated by the first air compressor compressing the air to increase the temperature of the low-temperature molten salt. The molten salt with increased temperature then flows through the collector to absorb solar energy to further increase the temperature of the molten salt, and finally the high-temperature molten salt is stored in the hot salt tank. The molten salt air heat exchanger absorbs the heat released by the high-temperature molten salt in the hot salt tank, and the heat is used to increase the temperature of the high-pressure air output by the gas storage tank to obtain high-temperature compressed air. The high-temperature compressed air drives the expansion unit to generate power, and then transmits the electric energy to the power grid.

[0069] In the embodiment of the present invention, the photovoltaic power generation device, the photovoltaic thermal energy storage module and the expansion energy release power generation module work together to realize multiple operation modes, including: photovoltaic energy storage operation mode, thermal energy storage operation mode, expansion energy release power generation operation mode, photovoltaic power generation online operation mode, power grid electric energy storage operation mode, photovoltaic thermal energy storage and expansion energy release power generation operation mode. Among them, different operation modes are determined according to the dispatching requirements of the power grid in actual work.

[0070] In the embodiment of the present invention, the photovoltaic energy storage operation mode is: converting solar energy into electrical energy, and driving the compressor through the generated electrical energy, and storing the mechanical energy and thermal energy generated in the air compression process. Specifically, the photovoltaic power generation device converts solar energy into electrical energy, and then drives the compressor to compress the air into high-pressure air and store it in the air storage tank, and at the same time transfers the heat generated in the air compression process to the air molten salt heat exchanger, which transfers the heat to the low-temperature molten salt flowing through the air molten salt heat exchanger, and then after passing through the collector, the heat is finally stored in the hot salt tank.

[0071] In the embodiment of the present invention, the solar thermal energy storage operation mode is: converting solar energy into thermal energy, heating molten salt by thermal energy, and storing the generated heat. Specifically, the collector can directly convert solar energy into thermal energy to heat molten salt, and store the heat in the hot salt tank.

[0072] In the embodiment of the present invention, the expansion energy-release power generation operation mode is: after the stored compressed air absorbs the heat of the hot molten salt, it expands to generate electricity. Specifically, the compressed air in the gas storage tank first absorbs the heat of the high-temperature molten salt in the hot salt tank through the molten salt air heat exchanger, and then generates electricity through the expansion unit to transmit the electric energy to the power grid.

[0073] In the embodiment of the present invention, the photovoltaic power generation grid operation mode is: the electricity generated by photovoltaic power generation is transmitted to the power grid. Specifically, when the power grid is short of power, the electricity generated by the photovoltaic power generation device can be suspended from storage and directly transmitted to the power grid.

[0074] In the embodiment of the present invention, the grid power storage operation mode is: storing grid power. Specifically, when the grid power is surplus, the grid power can be received reversely and stored.

[0075] In the embodiment of the present invention, the photovoltaic thermal energy storage and expansion energy release power generation operation modes are: the photovoltaic thermal energy storage mode and the expansion energy release power generation operation mode are performed in parallel. Specifically, when necessary, the photovoltaic thermal energy storage operation mode and the expander energy release power generation operation mode can be performed simultaneously.

[0076] The present invention uses decoupled operation of photovoltaic thermal energy storage and energy release power generation, which effectively alleviates the impact of intermittent and discontinuous photovoltaic power generation on the power grid. At the same time, photothermal energy is used as a compressed air heat supplement device to improve the efficiency of the expansion generator set. Moreover, the operation mode is flexible, and photovoltaic thermal energy storage can be operated alone, energy release power generation can be operated alone, photovoltaic thermal energy storage and energy release power generation can be operated simultaneously, photovoltaic power generation can be operated online, and surplus power storage can be consumed online. The present invention can provide stable and adjustable friendly power transmission to the power grid, which not only improves the utilization efficiency of new energy but also improves the stability of the power grid.

[0077] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0078] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0079] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0080] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A photovoltaic thermal heating type compressed air energy storage power generation system, characterized in that: include: Photovoltaic power generation device, compressed air energy storage module, photothermal heat supplement module and expansion energy release power generation module; The photovoltaic power generation device is used to convert solar energy into electrical energy, and transmit the electrical energy to the power grid or transmit the electrical energy to the compressed air energy storage module; The compressed air energy storage module is connected to the photovoltaic power generation device and is used to convert the electrical energy into mechanical energy and thermal energy and store them; The photothermal heat supplement module is connected to the compressed air energy storage module and is used to convert solar energy into thermal energy and store it; The expansion energy release power generation module is connected to the compressed air energy storage module and the photothermal heat compensation module, and is used to generate electricity based on the mechanical energy and thermal energy to transmit the generated electrical energy to the power grid.

2. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 1 is characterized in that: The compressed air energy storage module comprises: a pressure storage circuit and a heat storage circuit; The pressure storage circuit is used to convert the electrical energy into mechanical energy and store it; The heat storage circuit is used to convert the electrical energy into thermal energy and store it.

3. The photovoltaic light-thermal heat-compensating compressed air energy storage power generation system according to claim 2 is characterized in that: The pressure storage circuit comprises: a compressor, a first heat exchanger and a gas storage tank; The compressor is connected to the photovoltaic power generation device, and is used to compress air according to the electric energy generated by the photovoltaic power generation device, and transmit the high-pressure air to the air storage tank through the first heat exchanger; The air storage tank is used to store the high-pressure air; The high-pressure air is the mechanical energy.

4. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 3 is characterized in that: The heat storage circuit comprises: the compressor, the first heat exchanger, a heat collector, a cold salt tank and a hot salt tank; The cold salt tank is used to store low-temperature molten salt to provide low-temperature molten salt to the first heat exchanger; The compressor is used to compress the electric energy generated by the photovoltaic power generation device into air; The first heat exchanger is connected to the compressor and is used to absorb the heat generated during the compression process of the compressor and store it in the hot salt tank after passing through the collector; The heat collector is used to transmit the first heat exchanger and the absorbed heat energy; The hot salt tank is used to store high-temperature molten salt so as to store the heat energy absorbed by the first heat exchanger through the high-temperature molten salt.

5. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 3 is characterized in that: The first heat exchanger is an air molten salt heat exchanger; The air molten salt heat exchanger is used to absorb the heat generated by the first compressor during the process of compressing air.

6. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 1 is characterized in that: The expansion energy-release power generation module comprises: an energy-release power generation circuit; The energy-releasing power generation circuit is used to generate power by doing work according to the mechanical energy and the thermal energy, and transmit the generated electric energy to the power grid.

7. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 6 is characterized in that: The energy-releasing power generation circuit comprises: a cold salt tank, the hot salt tank, the gas storage tank, a second heat exchanger and an expansion generator set; The air storage tank is used to store the high-pressure air; The hot salt tank is used to store high-temperature molten salt and release heat through the second heat exchanger to heat the high-pressure air; The cold salt tank is used to store low-temperature molten salt; The second heat exchanger is connected to the hot salt tank, the cold salt tank and the gas storage tank respectively, and is used to absorb the heat released by the high-temperature molten salt stored in the hot salt tank to increase the temperature of the high-pressure air output by the gas storage tank to obtain high-temperature compressed air; The expansion generator set is connected to the second heat exchanger and is used to generate electricity according to the work of the high-temperature compressed air, so as to send the generated electric energy to the power grid.

8. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 7 is characterized in that: The second heat exchanger is a molten salt air heat exchanger; The molten salt air heat exchanger is used to absorb the heat released by the high-temperature molten salt to increase the temperature of the high-pressure air and obtain the high-temperature compressed air.

9. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 1, characterized in that: The photothermal heat supplement module includes: a photothermal heat supplement circuit; the photothermal heat supplement circuit includes: a heat collector, a hot salt tank, a cold salt tank, and a first heat exchanger; the heat collector, the hot salt tank, the cold salt tank, and the first heat exchanger constitute the photothermal heat supplement circuit; The thermal collector is used to absorb solar energy and convert the solar energy into thermal energy; The hot salt tank is used to store high-temperature molten salt so as to store the thermal energy absorbed by the collector through the high-temperature molten salt.

10. The photovoltaic-thermal-heat-compensated compressed air energy storage power generation system according to claim 1, characterized in that: include: Photovoltaic energy storage operation mode, the photovoltaic energy storage operation mode is: converting solar energy into electrical energy, driving the compressor with the generated electrical energy, and storing the mechanical energy and thermal energy generated during the air compression process; Solar thermal energy storage operation mode, the solar thermal energy storage operation mode is: converting solar energy into thermal energy, heating molten salt by the thermal energy, and storing the generated heat; The expansion energy-releasing power generation operation mode is as follows: after the stored compressed air absorbs the heat of the hot molten salt, the expanded generator set is used to generate electricity; Photovoltaic power generation grid-connected operation mode, the photovoltaic power generation grid-connected operation mode is: the electric energy generated by photovoltaic power generation is transmitted to the power grid; The grid electric energy storage operation mode is as follows: storing grid electric energy; Photovoltaic thermal energy storage and expansion energy release power generation operation mode, the photovoltaic thermal energy storage and expansion energy release power generation operation mode is: the photovoltaic thermal energy storage mode and the expansion energy release power generation operation mode are executed in parallel.

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