A wind-solar-thermal combined power generation system and method integrated with hybrid energy storage

Abstract

The present application relates to the technical field of unit energy storage peak shaving power generation, and particularly relates to a wind-solar-thermal storage combined power generation system and method integrated with hybrid energy storage. The wind-solar-thermal storage combined power generation system is connected with a power grid and comprises six subsystems, i.e., a steam power cycle, solar heat collection, molten salt heat storage, advanced adiabatic compressed air energy storage, photovoltaic and wind power. The subsystems have clear division of labor: the steam power cycle provides main steam heat energy and supplies electric energy, the solar heat collection converts solar energy, the molten salt heat storage adjusts energy, the compressed air energy storage realizes bidirectional conversion of energy, and the photovoltaic and wind power supply electric energy. The system controls the energy flow direction through six valve assemblies, and by opening or closing a specific valve, the energy storage and energy release modes can be switched, energy can be flexibly allocated, the renewable energy consumption capacity can be improved, and the stable operation of the power grid can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unit energy storage peak shaving power generation, and particularly relates to a wind-solar-thermal energy storage combined power generation system and method integrated with hybrid energy storage. BACKGROUND

[0002] Renewable energy has the characteristics of unpredictability, volatility and intermittency, which affects the stability of power grid operation, and even causes power failure in serious cases. This phenomenon will not be reversed in the short term. In order to further strengthen energy saving and emission reduction, it is particularly important to develop a new system of power generation device on the basis of existing thermal power units, match new energy power generation and energy storage devices, which will reduce carbon dioxide emissions and increase the flexibility of thermal power units to a certain extent.

[0003] Therefore, there is an urgent need for a wind-solar-thermal energy storage combined power generation system and method integrated with hybrid energy storage to solve the technical problem of how to improve the stability of power grid operation under the premise of improving the ability to consume renewable energy. SUMMARY

[0004] In order to solve the technical problem of how to improve the stability of power grid operation under the premise of improving the ability to consume renewable energy, the present application provides a wind-solar-thermal energy storage combined power generation system and method integrated with hybrid energy storage.

[0005] In a first aspect, the present application provides a wind-solar-thermal energy storage combined power generation system integrated with hybrid energy storage, which is electrically connected with a power grid, and comprises a steam power cycle power generation subsystem, a solar heat collection subsystem, a molten salt heat storage subsystem, an advanced adiabatic compressed air energy storage subsystem, a photovoltaic power generation subsystem and a wind power generation subsystem.

[0006] The steam power cycle power generation subsystem is connected with the molten salt heat storage subsystem and the advanced adiabatic compressed air energy storage subsystem in sequence through a fourth valve assembly and a sixth valve assembly respectively; the solar heat collection subsystem is connected with the steam power cycle power generation subsystem and the molten salt heat storage subsystem in sequence through a first valve assembly and a second valve assembly respectively; the molten salt heat storage subsystem is connected with the steam power cycle power generation subsystem and the advanced adiabatic compressed air energy storage subsystem in sequence through a third valve assembly and a fifth valve assembly respectively; the photovoltaic power generation subsystem and the wind power generation subsystem are connected with the advanced adiabatic compressed air energy storage subsystem respectively.

[0007] The steam power cycle power generation subsystem is configured to provide main steam heat energy to the molten salt heat storage subsystem or provide electric energy to the advanced adiabatic compressed air energy storage subsystem.

[0008] The solar heat collecting subsystem is configured to convert received solar energy into heat energy and provide the heat energy to the steam power cycle subsystem and the molten salt heat storage subsystem.

[0009] The molten salt heat storage subsystem is configured to convert received solar heat energy or main steam heat energy into molten salt heat storage energy and provide the heat energy to the steam power cycle subsystem or the advanced adiabatic compressed air energy storage subsystem.

[0010] The advanced adiabatic compressed air energy storage subsystem is configured to convert received electric energy into air internal energy of high-pressure air, and the air compression heat in the process is recovered to the steam power cycle subsystem turbine regenerative system and the air internal energy of high-temperature and high-pressure air after heat exchange by the molten salt heat storage subsystem into mechanical energy.

[0011] The photovoltaic power generation subsystem is configured to convert received solar energy into electric energy and provide the electric energy to the advanced adiabatic compressed air energy storage subsystem.

[0012] The wind power generation subsystem is configured to convert received wind energy into electric energy and provide the electric energy to the advanced adiabatic compressed air energy storage subsystem.

[0013] The first valve assembly is configured to control solar heat energy to flow from the solar heat collecting subsystem to the steam power cycle subsystem; the second valve assembly is configured to control solar heat energy to flow from the solar heat collecting subsystem to the molten salt heat storage subsystem; the third valve assembly is configured to control molten salt heat storage energy to flow from the molten salt heat storage subsystem to the steam power cycle subsystem; the fourth valve assembly is configured to control main steam heat energy to flow from the steam power cycle subsystem to the molten salt heat storage subsystem; the fifth valve assembly is configured to control molten salt heat storage energy to flow from the molten salt heat storage subsystem to the advanced adiabatic compressed air energy storage subsystem; and the sixth valve assembly is configured to control electric energy to flow from the steam power cycle subsystem to the advanced adiabatic compressed air energy storage subsystem.

[0014] In a second aspect, an embodiment of the present application provides a wind-solar-thermal storage combined power generation method for integrated hybrid energy storage, applied to the wind-solar-thermal storage combined power generation system, and comprising the following steps:

[0015] When the wind-solar-thermal storage combined power generation system is in energy storage operation, the second valve assembly, the fourth valve assembly and the sixth valve assembly are opened, and the first valve assembly, the third valve assembly and the fifth valve assembly are closed at the same time.

[0016] When the wind-solar-thermal storage combined power generation system releases energy, the third valve assembly and the fifth valve assembly are opened, and the first valve assembly, the second valve assembly, the fourth valve assembly and the sixth valve assembly are closed.

[0017] The wind-solar-thermal storage combined power generation system of the embodiment of the present application is connected with a power grid, and includes a steam power cycle, a solar heat collection, a molten salt heat storage, an advanced adiabatic compressed air energy storage, a photovoltaic and a wind power system. Each system has clear division of labor and close cooperation: the steam power cycle power generation system provides main steam heat energy and electric energy to supply energy for the molten salt heat storage subsystem and the advanced adiabatic compressed air energy storage subsystem; the solar heat collection subsystem converts solar energy into heat energy to benefit the steam power cycle subsystem and the molten salt heat storage subsystem; the molten salt heat storage subsystem can absorb heat energy to store as molten salt heat energy, and can also release molten salt heat energy to heat high-pressure feed water and high-pressure air; the advanced adiabatic compressed air energy storage subsystem realizes bidirectional conversion of electric energy and air internal energy; the photovoltaic power generation system and the wind power generation system convert solar radiation energy and wind energy into electric energy to supply power for the advanced adiabatic compressed air energy storage subsystem. The system precisely controls the energy flow direction through six valve assemblies: the first and second valve assemblies respectively regulate the heat energy transmission between the solar heat collection subsystem and the steam power cycle power generation system and the molten salt heat storage subsystem; the third and fourth valve assemblies regulate the heat energy transmission between the molten salt heat storage subsystem and the steam power cycle power generation system; the fifth valve assembly regulates the heat energy transmission between the molten salt heat storage subsystem and the advanced adiabatic compressed air energy storage subsystem; and the sixth valve assembly regulates the electric energy transmission between the steam power cycle power generation system and the advanced adiabatic compressed air energy storage subsystem. When the second, fourth and sixth valve assemblies are opened and the first, third and fifth valve assemblies are closed, the system enters the energy storage mode, the electric energy generated by the steam power cycle power generation system and the excess electric energy of the photovoltaic and wind power are used for compressed air energy storage, and the main steam heat energy of the steam power cycle subsystem and the solar heat energy of the solar heat collection subsystem are converted into molten salt heat energy; when the first, second, fourth and sixth valve assemblies are closed and the remaining valve assemblies are opened, the system switches to the energy release mode, the high-temperature molten salt releases heat energy to replace the extraction steam of the steam turbine for heat recovery, thereby saving more extraction steam to do work in the steam turbine, and heating high-pressure air to enter the expander for expansion to generate electricity, thereby realizing flexible deployment of energy. This design effectively improves the renewable energy consumption capacity, guarantees stable operation of the power grid, and promotes clean transformation of the energy structure. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0019] Figure 1 The structural diagram of the integrated hybrid energy storage wind-solar-thermal combined power generation system according to one embodiment is shown.

[0020] Figure 2 The specific structural diagram of the integrated hybrid energy storage wind-solar-thermal combined power generation system is shown. Figure 1

[0021] Figure 3 The flow chart of a kind of integrated hybrid energy storage wind-solar-thermal combined power generation method.

[0022] Reference signs:

[0023] 1-steam power cycle power generation system;

[0024] 13-steam generator; 14-turbine; 15-first generator; 16-steam condenser; 17-low pressure heater;

[0025] 18-oxygen remover; 19-high pressure heater; 1A-high pressure feed water pump; 1B-low pressure feed water pump;

[0026] 2-solar heat collection subsystem;

[0027] 21-solar mirror field; 22-solar heat collector;

[0028] 3-molten salt heat storage subsystem;

[0029] 31-high temperature molten salt tank; 32-low temperature molten salt tank; 33-molten salt heat exchanger; 34-molten salt steam heat exchanger;

[0030] 4-advanced adiabatic compressed air energy storage subsystem;

[0031] 41-compressor; 42-air heat exchanger; 43-electric motor; 44-gas storage tank; 45-second generator,

[0032] 46-molten salt air heat exchanger; 47-expander;

[0033] 5-photovoltaic power generation subsystem;

[0034] 51-wind farm; 52-third generator;

[0035] 6-wind power generation subsystem; ​

[0036] 61 - photovoltaic power plant; 62 - fourth generator;

[0037] 7 - first valve assembly;

[0038] 71 - first valve; 72 - third valve; 73 - fourth valve;

[0039] 8 - second valve assembly;

[0040] 81 - fifth valve; 82 - sixth valve;

[0041] 9 - third valve assembly;

[0042] 91 - second valve; 92 - seventh valve;

[0043] 10 - fourth valve assembly;

[0044] 101 - eighth valve; 102 - ninth valve;

[0045] 11 - fifth valve assembly;

[0046] 111 - eleventh valve; 112 - twelfth valve;

[0047] 12 - sixth valve assembly;

[0048] 121 - tenth valve. DETAILED DESCRIPTION

[0049] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0050] Reference should be made to Figure 1The embodiment of the present application provides a wind-solar-thermal storage combined power generation system integrated with hybrid energy storage, the wind-solar-thermal storage combined power generation system is electrically connected with a power grid, and the wind-solar-thermal storage combined power generation system comprises a steam power cycle power generation subsystem 1, a solar heat collection subsystem 2, a molten salt heat storage subsystem 3, an advanced adiabatic compressed air energy storage subsystem 4, a photovoltaic power generation subsystem 5 and a wind power generation subsystem 6; the steam power cycle power generation subsystem 1 is connected with the molten salt heat storage subsystem 3 and the advanced adiabatic compressed air energy storage subsystem 4 in sequence through a fourth valve assembly 10 and a sixth valve assembly 12 respectively; the solar heat collection subsystem 2 is connected with the steam power cycle power generation subsystem 1 and the molten salt heat storage subsystem 3 in sequence through a first valve assembly 7 and a second valve assembly 8 respectively; the molten salt heat storage subsystem 3 is connected with the steam power cycle power generation subsystem 1 and the advanced adiabatic compressed air energy storage subsystem 4 in sequence through a third valve assembly 9 and a fifth valve assembly 11 respectively; the photovoltaic power generation subsystem 5 and the wind power generation subsystem 6 are connected with the advanced adiabatic compressed air energy storage subsystem 4 respectively.

[0051] The steam power cycle power generation subsystem 1 is used for providing main steam heat energy to the molten salt heat storage subsystem 3 or providing electric energy to the advanced adiabatic compressed air energy storage subsystem 4; the solar heat collection subsystem 2 is used for converting received solar energy into heat energy and providing the heat energy to the steam power cycle power generation subsystem 1 and the molten salt heat storage subsystem 3; the molten salt heat storage subsystem 3 is used for converting received solar heat energy or main steam heat energy into molten salt heat storage energy and providing the heat energy to the steam power cycle power generation subsystem 1 or the advanced adiabatic compressed air energy storage subsystem 4; the advanced adiabatic compressed air energy storage subsystem 4 is used for converting received electric energy into air internal energy of high-pressure air, and air compression heat in the process is recovered into a steam turbine heat recovery system of the steam power cycle power generation subsystem 1 and air internal energy of high-temperature and high-pressure air after heat exchange through the molten salt heat storage subsystem 3 is converted into mechanical energy; the photovoltaic power generation subsystem 5 is used for converting received solar energy into electric energy and providing the electric energy to the advanced adiabatic compressed air energy storage subsystem 4; the wind power generation subsystem 6 is used for converting received wind energy into electric energy and providing the electric energy to the advanced adiabatic compressed air energy storage subsystem 4; wherein the first valve assembly 7 is used for controlling solar heat energy to flow from the solar heat collection subsystem 2 to the steam power cycle power generation subsystem 1; the second valve assembly 8 is used for controlling solar heat energy to flow from the solar heat collection subsystem 2 to the molten salt heat storage subsystem 3; the third valve assembly 9 is used for controlling molten salt heat storage energy to flow from the molten salt heat storage subsystem 3 to the steam power cycle power generation subsystem 1; the fourth valve assembly 10 is used for controlling main steam heat energy to flow from the steam power cycle power generation subsystem 1 to the molten salt heat storage subsystem 3; the fifth valve assembly 11 is used for controlling molten salt heat storage energy to flow from the molten salt heat storage subsystem 3 to the advanced adiabatic compressed air energy storage subsystem 4; and the sixth valve assembly 12 is used for controlling electric energy to flow from the steam power cycle power generation subsystem 1 to the advanced adiabatic compressed air energy storage subsystem 4.

[0052] In the present embodiment, the wind-solar-thermal-storage combined power generation system is connected with the power grid, and the wind-solar-thermal-storage combined power generation system includes six power generation sub-systems, i.e., a steam power cycle, a solar heat collection, a molten salt heat storage, an advanced adiabatic compressed air energy storage, a photovoltaic and a wind power. The six sub-systems have clear division of labor and close cooperation: the steam power cycle power generation sub-system 1 provides main steam heat energy and electric energy, and supplies energy for the molten salt heat storage sub-system 3 and the advanced adiabatic compressed air energy storage sub-system 4; the solar heat collection sub-system 2 converts solar energy into heat energy, which is used to support the steam power cycle sub-system 1 and the molten salt heat storage sub-system 3; the molten salt heat storage sub-system 3 can absorb heat energy and store it as molten salt heat energy, and can also release the molten salt heat energy to heat high-pressure feed water and high-pressure air; the advanced adiabatic compressed air energy storage sub-system 4 realizes bidirectional conversion of electric energy and air internal energy; the photovoltaic power generation system 5 and the wind power generation sub-system 6 convert solar radiation energy and wind energy into electric energy, which is used to supply power for the advanced adiabatic compressed air energy storage sub-system 4. The system precisely controls the energy flow direction through six valve assemblies: the first and second valve assemblies respectively regulate the heat energy transmission between the solar heat collection sub-system 2 and the steam power cycle power generation sub-system 1 and the molten salt heat storage sub-system 3; the third and fourth valve assemblies regulate the heat energy transmission between the molten salt heat storage sub-system 3 and the steam power cycle power generation sub-system 1; the fifth valve assembly 11 regulates the heat energy transmission between the molten salt heat storage sub-system 3 and the advanced adiabatic compressed air energy storage sub-system 4; and the sixth valve assembly 12 regulates the electric energy transmission between the steam power cycle power generation sub-system 1 and the advanced adiabatic compressed air energy storage sub-system 4. When the second, fourth and sixth valve assemblies are opened and the first, third and fifth valve assemblies are closed, the system enters the energy storage mode, and the electric energy generated by the steam power cycle power generation sub-system 1 and the excess electric energy of the photovoltaic and wind power is used for compressed air energy storage, and the main steam heat energy of the steam power cycle sub-system 1 and the solar heat energy of the solar heat collection sub-system 2 are converted into molten salt heat storage. When the first, second, fourth and sixth valve assemblies are closed and the remaining valve assemblies are opened, the system switches to the energy release mode, the high-temperature molten salt releases heat energy to replace the extraction steam of the steam turbine, thereby saving more extraction steam to do work in the steam turbine, and the high-pressure air heated by the heat energy is expanded in the expander to generate electricity, thereby realizing flexible deployment of energy. This design effectively improves the renewable energy consumption capacity, guarantees the stable operation of the power grid, and promotes the clean transformation of the energy structure.

[0053] As Figure 2As shown, in this embodiment, the steam power cycle power generation system 1 replaces part of the extraction steam of the steam turbine 14 to heat the high pressure feed water by using the solar heat generated by the solar heat collection subsystem 2; the steam power cycle power generation system 1 replaces part of the extraction steam of the steam turbine 14 to heat the high pressure feed water by using the molten salt heat stored by the molten salt heat storage subsystem 3; the steam power cycle power generation system 1 replaces part of the extraction steam of the steam turbine 14 to heat the low pressure feed water by using the air compression heat generated by the advanced adiabatic compressed air energy storage subsystem 4; the molten salt heat storage subsystem 3 converts the excess solar heat generated by the solar heat collection subsystem 2 into molten salt heat storage; the molten salt heat storage subsystem 3 converts part of the main steam heat generated by the steam power cycle power generation system 1 into molten salt heat storage; the advanced adiabatic compressed air energy storage subsystem 4 converts the electricity generated by the photovoltaic power generation system 5, the wind power generation system 6 and the cheap valley electricity into the internal energy of high pressure air; the advanced adiabatic compressed air energy storage subsystem 4 heats the high pressure air by using the molten salt heat generated by the molten salt heat storage subsystem 3. In the energy storage mode, the second valve assembly 8, the fourth valve assembly 10 and the sixth valve assembly 12 are opened, and the first valve assembly 7, the third valve assembly 9 and the fifth valve assembly 11 are closed at the same time; the steam heat and the solar heat are stored and converted into molten salt heat for heat storage, and the electricity is converted into high pressure air and stored in the air tank 44; in the energy release mode, the third valve assembly 9 and the fifth valve assembly 11 are opened, and the first valve assembly 7, the second valve assembly 8, the fourth valve assembly 10 and the sixth valve assembly 12 are closed at the same time, the molten salt heat is used to heat the high pressure air and the high pressure feed water for heat release. The electricity generated by the photovoltaic power generation system 5 and the wind power generation system 6 is preferentially provided to the users, if the user load is met, the remaining part of the electricity is sent to the advanced adiabatic compressed air energy storage subsystem 4 to generate high pressure air; if the electricity generated by the photovoltaic power generation system 5 and the wind power generation system 6 only meets part of the user load, the remaining part is made up by the electricity generated by the steam power cycle power generation system 1; the electricity generated by the steam power cycle power generation system 1 is preferentially provided to the advanced adiabatic compressed air energy storage subsystem 4, if the load required by the advanced adiabatic compressed air energy storage subsystem 4 is met, the remaining part of the electricity is provided to the users. When the unit needs to operate at low load or reduce load, the fourth valve assembly 10 and the sixth valve assembly 12 are opened, and the first valve assembly 7, the second valve assembly 8, the third valve assembly 9 and the fifth valve assembly 11 are closed at the same time, the steam heat is converted into molten salt heat for heat storage, and the electricity is converted into high pressure air and stored in the air tank 44; when the unit needs to increase load, the second valve assembly 8, the fourth valve assembly 10 and the sixth valve assembly 12 are closed, and the first valve assembly 7, the third valve assembly 9 and the fifth valve assembly 11 are opened at the same time, the heat collected by the solar heat collector heats the high pressure feed water, and the heat stored in the molten salt releases to heat the high pressure air and the high pressure feed water.

[0054] In one embodiment of the present application, the first valve assembly 7 comprises a first valve 71, a third valve 72 and a fourth valve 73; the second valve assembly 8 comprises a fifth valve 81 and a sixth valve 82; the third valve assembly 9 comprises a second valve 91 and a seventh valve 92; the fourth valve assembly 10 comprises an eighth valve 101 and a ninth valve 102; the fifth valve assembly 11 comprises an eleventh valve 111 and a twelfth valve 112; the sixth valve assembly 12 comprises a tenth valve 121.

[0055] In one embodiment of the present application, the steam power cycle generating system 1 comprises a steam generator 13, a steam turbine 14, a first generator 15, a condenser 16, a low pressure heater 17, a deaerator 18, a high pressure heater 19, a high pressure feed water pump 1A and a low pressure feed water pump 1B;

[0056] The outlet of the steam generator 13 is connected to the steam turbine 14 and the molten salt thermal storage subsystem 3 respectively; the first generator 15 is coaxially connected to the steam turbine 14; the first stage extraction steam of the steam turbine 14 is connected to the high pressure heater 19 and the steam generator 13 respectively; the second stage extraction steam of the steam turbine 14 is connected to the deaerator 18; the third stage extraction steam of the steam turbine 14 is connected to the low pressure heater 17; the exhaust steam of the steam turbine 14 is connected to the condenser 16; the condenser 16 is connected to the low pressure feed water pump 1B; the low pressure feed water pump 1B is connected to the low pressure heater 17; the water side inlet of the low pressure heater 17 is connected to the deaerator 18; the water side outlet of the deaerator 18 is connected to the high pressure feed water pump 1A; the high pressure feed water pump 1A is connected to the high pressure heater 19; the high pressure heater 19 is connected to the steam generator 13;

[0057] The steam generator 13 is used to heat the high pressure feed water into steam or heat the first stage extraction steam of the steam turbine into reheat steam; the steam turbine 14 is used to convert the received steam heat energy into mechanical energy; the first generator 15 is used to convert the received mechanical energy into electrical energy; the condenser 16 is used to condense the exhaust steam of the steam turbine 14 into water; the low pressure heater 17 is used to preheat the low pressure feed water by the third stage extraction steam of the steam turbine 14; the deaerator 18 is used to remove the dissolved oxygen in the water by the second stage extraction steam of the steam turbine; the high pressure heater 19 is used to heat the high pressure feed water by the first stage extraction steam of the steam turbine; the high pressure feed water pump 1A is used to pressurize the water side outlet of the deaerator 18 into high pressure feed water; the low pressure feed water pump 1B is used to pressurize the outlet of the condenser 16 into low pressure feed water.

[0058] As Figure 2As shown, in this embodiment, during system operation, a portion of the high-temperature, high-pressure steam generated by the steam generator 13 directly enters the steam turbine 14, driving the turbine 14 to rotate and converting the internal energy of the steam into mechanical energy. The coaxially connected first generator 15 further converts the mechanical energy into electrical energy and feeds it into the power grid. The other portion of the steam is transported to the molten salt thermal storage subsystem 3 for thermal storage. During the operation of the steam turbine 14, a multi-stage extraction method is used to improve energy utilization efficiency: the first stage extraction steam is transported to the high-pressure heater 19 and the steam generator 13 respectively to heat the high-pressure feedwater and reintroduce it into the steam generator 13 for reheating; the second stage extraction steam enters the deaerator 18, using steam heating to remove dissolved oxygen in the water and prevent equipment corrosion; the third stage extraction steam is used in the low-pressure heater 17 to preheat the low-pressure feedwater from the condenser 16. The exhaust steam after the steam turbine 14 has done its work enters the condenser 16, is condensed into water, and then passes through the low-pressure heater 17, the deaerator 18, and the high-pressure heater 19 for heating in sequence, finally returning to the steam generator 13 to complete the cycle. Through this design, the system achieves efficient conversion of thermal energy into mechanical energy into electrical energy, while improving overall thermal efficiency and reducing energy consumption through steam extraction and regeneration technology.

[0059] In one embodiment of the present invention, the solar thermal collector subsystem 2 includes a thermal collector mirror field 21 and a solar thermal collector 22 connected in sequence;

[0060] The solar collector mirror 21 is used to receive solar energy;

[0061] The solar collector 22 is used to convert the received solar energy into thermal energy.

[0062] like Figure 2 As shown, in this embodiment, during system operation, the solar collector field 21 first receives solar radiation energy and focuses the dispersed sunlight onto the solar collector 22 through its internal reflectors or lenses. The solar collector 22 then uses its internal heat-absorbing medium (such as heat transfer oil or molten salt) to absorb the focused high-energy sunlight, converting it into heat energy. This heat energy is then used by the molten salt heat exchanger 33 to replace the regenerative steam for heating the high-pressure feedwater, saving more steam extraction time to perform work in the turbine 14. This design achieves efficient conversion of solar energy into thermal energy, providing a clean and sustainable heat source for the entire combined heat and power generation system.

[0063] In one embodiment of the present invention, the molten salt thermal storage subsystem 3 includes a high-temperature molten salt tank 31, a low-temperature molten salt tank 32, a molten salt heat exchanger 33, and a molten salt steam heat exchanger 34; the outlet of the high-temperature molten salt tank 31 is connected to the molten salt heat exchanger 33; the molten salt outlet of the molten salt heat exchanger 33 is connected to the inlet of the low-temperature molten salt tank 32; the outlet of the low-temperature molten salt tank 32 is connected to both the molten salt steam heat exchanger 34 and the solar collector 22; the inlet of the high-temperature molten salt tank 31 is connected to both the molten salt steam heat exchanger 34 and the molten salt outlet of the solar collector 22; the water-side outlet of the deaerator 18 is connected to a first valve 71 connected in parallel via a high-pressure feedwater pump 1A. The second valve 91 is connected to the molten salt heat exchanger 33. The solar collector 22 is connected to the molten salt heat exchanger 33 through the third valve 72. The solar collector 22 is connected to the high-temperature molten salt tank 31 through the sixth valve 82. The high-temperature molten salt tank 31 is connected to the molten salt heat exchanger 33 through the seventh valve 92. The low-temperature molten salt tank 32 is connected to the solar collector 22 through the fourth valve 73 and the fifth valve 81 connected in parallel. The main steam outlet of the steam generator 13 is connected to the molten salt steam heat exchanger 34 through the eighth valve 101. The low-temperature molten salt tank 32 is connected to the molten salt steam heat exchanger 34 through the ninth valve 102.

[0064] The high-temperature molten salt tank 31 is used to store high-temperature molten salt; the low-temperature molten salt tank 32 is used to store low-temperature molten salt; the molten salt heat exchanger 33 is used to heat high-pressure feedwater using solar thermal energy or molten salt thermal energy; and the molten salt steam heat exchanger 34 is used to convert the main steam thermal energy into molten salt thermal energy.

[0065] like Figure 2 As shown, in this embodiment, the molten salt thermal energy storage subsystem 3 includes a high-temperature molten salt tank 31, a low-temperature molten salt tank 32, a molten salt heat exchanger 33, a molten salt steam heat exchanger 34, and multiple valve assemblies. Thermal energy storage and release are achieved through the circulation of molten salt between the high and low temperature tanks: the molten salt in the low-temperature molten salt tank 32 can flow into the solar collector 22 through the fifth valve 81 to absorb heat, and then be stored in the high-temperature molten salt tank 31 through the sixth valve 82; or it can enter the molten salt steam heat exchanger 34 through the ninth valve 102 to absorb the main steam thermal energy of the steam power system and then return to the high-temperature molten salt tank 31; the molten salt in the high-temperature molten salt tank 31... The molten salt enters the molten salt heat exchanger 33 through the seventh valve 92, replacing the first-stage extraction steam of the steam turbine 14 to heat the high-pressure feedwater. After exchanging heat with the steam power system through the second valve 91, it becomes low-temperature molten salt and flows back to the low-temperature molten salt tank 32. The system regulates the flow direction of molten salt through various valve components to realize the storage and distribution of thermal energy for the solar thermal collector subsystem 2, the steam power cycle generator system 1, and the molten salt thermal storage subsystem 3. The molten salt heat exchanger 33 uses high-temperature molten salt thermal energy to replace the first-stage extraction steam of the steam turbine 14 to heat the high-pressure feedwater. The saved steam does work in the steam turbine to meet the heat demand of the power generation system.

[0066] In the embodiment, the working temperature of the high-temperature molten salt tank 31 is 565℃, the working temperature of the low-temperature molten salt tank 32 is 290℃, and the molten salt type is binary salt (60% NaNO3+40% KNO3).

[0067] In the embodiment, when the unit energy storage mode is running, the first valve 71, the second valve 91, the third valve 72, the fourth valve 73, the seventh valve 92, the tenth valve 121, the eleventh valve 111 and the twelfth valve 112 are closed, the fifth valve 81, the sixth valve 82, the eighth valve 101 and the ninth valve 102 are opened, the low-temperature molten salt tank 32 outlet molten salt is exchanged with the molten salt vapor heat exchanger 34 and the solar collector 22 respectively, the heat is stored in the high-temperature molten salt tank 31, and the steam after the heat exchange of the molten salt vapor heat exchanger 34 is mixed with the second stage extraction steam of the steam turbine 14 to enter the deaerator 18.

[0068] In the embodiment, when the unit energy release mode is running, the second valve 91 and the seventh valve 92 are opened, and the first valve 71, the third valve 72, the fourth valve 73, the fifth valve 81, the sixth valve 82, the eighth valve 101, the ninth valve 102, the tenth valve 121, the eleventh valve 111 and the twelfth valve 112 are closed, the heat stored in the high-temperature molten salt tank 31 is released, the high-pressure feed water is heated through the molten salt heat exchanger 33, and the heat storage of the molten salt in the process is recovered to the regenerative system of the steam turbine 14; the low-temperature molten salt after the heat exchange flows back to the low-temperature molten salt tank 32.

[0069] In the embodiment, when the unit needs to run at low load or reduce load, the first valve 71, the second valve 91, the third valve 72, the fourth valve 73, the fifth valve 81, the sixth valve 82, the seventh valve 92, the tenth valve 121, the eleventh valve 111 and the twelfth valve 112 are closed, and the eighth valve 101 and the ninth valve 102 are opened, the low-temperature molten salt tank 32 outlet molten salt is exchanged with the molten salt vapor heat exchanger 34, the main steam heat is stored in the high-temperature molten salt tank 31, the steam after the heat exchange of the molten salt vapor heat exchanger 34 is mixed with the second stage extraction steam of the steam turbine 14 to enter the deaerator 18, the extraction heat storage technology is used to actively reduce the unit load in the process, and the unit operation range is widened.

[0070] In this embodiment, when the unit needs to increase load, open the first valve 71, the second valve 91, the third valve 72, the fourth valve 73, the seventh valve 92, close the fifth valve 81, the sixth valve 82, the eighth valve 101, the ninth valve 102, the tenth valve 121, the eleventh valve 111, the twelfth valve 112, release the heat stored in the high-temperature molten salt tank 31 or the solar heat collected by the solar collector 22, heat the high-pressure feed water through the molten salt heat exchanger 33, and the molten salt heat storage or solar heat in the process is recovered to the regenerative system of the steam turbine 14, saving more steam extraction to do work in the steam turbine 14; the low-temperature molten salt after heat exchange flows back to the low-temperature molten salt tank 32.

[0071] In an embodiment of the application, the advanced adiabatic compressed air energy storage subsystem 4 includes a compressor 41, an air heat exchanger 42, an electric motor 43, an air storage tank 44, a second generator 45, a molten salt air heat exchanger 46, an expander 47;

[0072] The compressor 41 is coaxially connected with the electric motor 43; the outlet of the compressor 41 is connected with the air heat exchanger 42; the air heat exchanger 42 is connected with the air storage tank 44; the outlet of the molten salt air heat exchanger 46 is connected with the expander 47; the expander 47 is coaxially connected with the second generator 45; the water side outlet of the condenser 16 is connected with the air heat exchanger 42 through the tenth valve 121 and the low-pressure feed water pump 1B; the air outlet of the air storage tank 44 is connected with the molten salt air heat exchanger 46 through the eleventh valve 111; the high-temperature molten salt tank 31 is connected with the molten salt air heat exchanger 46 through the twelfth valve 112;

[0073] The electric motor 43 is used to drive the compressor 41 to convert electrical energy into mechanical energy; the compressor 41 is used for air compression to convert mechanical energy into air internal energy; the air heat exchanger 42 is used to recover the air compression heat to heat the low-pressure feed water; the air storage tank 44 is used to store high-pressure air; the molten salt air heat exchanger 46 is used to convert the heat storage energy of the molten salt to heat the high-pressure air; the expander 47 is used for high-pressure air expansion to convert air internal energy into mechanical energy to drive the second generator 45 to generate electricity; the second generator 45 is used to convert mechanical energy into electrical energy.

[0074] As Figure 2As shown, in this embodiment, the advanced adiabatic compressed air energy storage subsystem 4 achieves efficient conversion and storage of electrical and mechanical energy through the coordinated operation of its components. The system includes a compressor 41, an air heat exchanger 42, a motor 43, an air storage tank 44, a second generator 45, a molten salt air heat exchanger 46, and an expander 47. When the unit is storing energy, operating at low load, or reducing load, the tenth valve 121 is opened, and the other valves are closed. The motor 43 drives the coaxially connected compressor 41, converting electrical energy into air internal energy. Low-pressure feedwater enters the air heat exchanger 42 through the tenth valve 121, exchanging heat with the high-temperature, high-pressure air generated by the compressor 41. The cooled high-pressure air is stored in the air storage tank 44, and the heat of compression is used to replace regenerative steam to heat the low-pressure feedwater. When the unit is releasing energy or increasing load, the eleventh valve 111 and the twelfth valve 112 are opened, and the other valves are closed. High-pressure air in the gas storage tank 44 enters the molten salt air heat exchanger 46 through the eleventh valve 111, absorbing the thermal energy stored in the molten salt and increasing its temperature. It then enters the expander 47 to expand and perform work, driving the coaxial second generator 45 to convert mechanical energy into electrical energy. Through this cyclical path of "electrical energy - air internal energy - mechanical energy - electrical energy," combined with the assistance of molten salt thermal energy storage, this subsystem effectively improves energy storage efficiency and power generation stability, providing flexible peak-shaving capabilities for wind-solar-thermal-storage combined power generation systems.

[0075] In one embodiment of the present invention, the wind power generation system 6 includes a wind farm 51 and a third generator 52 connected in sequence;

[0076] Wind farm 51 is used to receive wind energy;

[0077] The third generator 52 is used to convert the received wind energy into electrical energy.

[0078] like Figure 2 As shown, in this embodiment, the wind power generation system 6 serves as the renewable energy unit of the wind-solar-thermal-storage combined power generation system. During system operation, the wind farm 51 captures wind energy through wind turbine generators, driving the turbine blades to rotate and converting the wind energy into mechanical energy. A third generator 52 is connected to the turbine's main shaft, further converting the mechanical energy into electrical energy. The generated energy can be directly connected to the power grid or transmitted through transmission lines to the advanced insulated compressed air energy storage subsystem 4, where it drives the electric motor 43 during the compressed air energy storage process, achieving efficient utilization and flexible allocation of wind energy.

[0079] In one embodiment of the present invention, the photovoltaic power generation system 5 includes a photovoltaic power station 61 and a fourth generator 62 connected in sequence;

[0080] Photovoltaic power station 61 is used to receive solar energy;

[0081] The fourth generator 62 is used to convert the received solar energy into electrical energy.

[0082] likeFigure 2 As shown, in the present embodiment, when the system is running, the photovoltaic power station 61 receives solar radiation energy through the solar panels, and directly converts the light energy into direct current by using the photoelectric effect. The fourth generator 62 (usually an inverter) converts the direct current into alternating current that meets the requirements of the power grid, and the generated power can be directly connected to the power grid or transmitted to the advanced adiabatic compressed air energy storage subsystem 4 for driving the air compressor 41 to convert the electric energy into the pressure energy of the high-pressure air, so as to realize efficient utilization and stable output of solar energy.

[0083] In summary, in the present application, when the unit is running at low load or reducing load, the steam energy at the outlet of the steam generator 13 is stored by the molten salt heat storage or charges the advanced adiabatic compressed air energy storage system, and the electric energy is converted into the pressure energy of the high-pressure air, so as to reduce the system output and realize the low load operation and flexibility of the unit. When the unit is increasing load, the heat of the high-temperature molten salt tank 31 is released to heat the feed water and the high-pressure air, so as to improve the variable load rate and flexibility of the unit. The power generation method and system of the present application can effectively suppress the intermittency and volatility of renewable energy power generation such as solar energy and wind energy; can store cheap valley electricity; can realize the coupling and complementation of renewable energy and compressed air energy storage; can fully utilize the air compression heat and solar heat of the system, and improve the energy utilization rate; can enhance the flexibility of system operation, widen the peak shaving space of the unit, and improve the capacity of renewable energy consumption, while taking into account the efficient utilization of energy.

[0084] In a second aspect, as Figure 3 As shown, the present application also provides a wind-solar-thermal energy storage combined power generation method integrated with mixed energy storage, which is applied to the wind-solar-thermal energy storage combined power generation system mentioned in the above embodiments, and the method comprises the following steps:

[0085] S1: When the wind-solar-thermal energy storage combined power generation system is running in energy storage mode, the second valve assembly 8, the fourth valve assembly 10, and the sixth valve assembly 12 are opened, and the first valve assembly 7, the third valve assembly 9, and the fifth valve assembly 11 are closed at the same time;

[0086] S2: When the wind-solar-thermal energy storage combined power generation system is running in energy release mode, the third valve assembly 9 and the fifth valve assembly 11 are opened, and the first valve assembly 7, the second valve assembly 8, the fourth valve assembly 10, and the sixth valve assembly 12 are closed at the same time.

[0087] In the present embodiment, the wind-solar-thermal energy storage combined power generation system realizes flexible switching of energy storage and release modes through intelligent opening and closing of the valve assemblies. When the energy storage is running, the second, fourth and sixth valve assemblies are opened, and the first, third and fifth valve assemblies are closed. At this time, the system preferentially stores the excess heat energy of the solar heat collection subsystem 2 into the molten salt heat storage subsystem 3, and at the same time, part of the main steam heat of the steam power cycle power generation subsystem 1 is used to supplement the molten salt heat storage. The electric energy generated by the steam power cycle power generation subsystem 1, the photovoltaic power generation subsystem and the wind power generation subsystem 6 drives the advanced adiabatic compressed air energy storage subsystem 4 to compress and store air energy. When the energy release is running, the third and fifth valve assemblies are opened, and the remaining valve assemblies are closed. The molten salt heat storage subsystem 3 releases high-temperature molten salt heat energy to provide heat for the steam power cycle subsystem 1, or to heat compressed air to drive the expander 47 to generate electricity, realizing multi-energy collaborative release and ensuring stable power output.

[0088] In some embodiments, the method further comprises:

[0089] When the wind-solar-thermal energy storage combined power generation system starts the load reduction mode, the fourth valve assembly 10 and the sixth valve assembly 12 are opened, and at the same time, the first valve assembly 7, the second valve assembly 8, the third valve assembly 9 and the fifth valve assembly 11 are closed.

[0090] When the wind-solar-thermal energy storage combined power generation system starts the load increase mode, the second valve assembly 8, the fourth valve assembly 10 and the sixth valve assembly 12 are closed, and at the same time, the first valve assembly 7, the third valve assembly 9 and the fifth valve assembly 11 are opened.

[0091] In the present embodiment, the wind-solar-thermal energy storage combined power generation system realizes dynamic load management through precise regulation and control of the valve assemblies. When the load reduction mode is started, the system opens the fourth and sixth valve assemblies and closes the first, second, third and fifth valve assemblies. The steam power cycle power generation subsystem 1 converts part of the main steam heat into molten salt heat storage, and the electric energy generated by the steam power cycle power generation subsystem 1, the photovoltaic power generation subsystem and the wind power generation subsystem 6 is used to drive the advanced adiabatic compressed air energy storage subsystem 4 to store energy in the form of compressed air and molten salt, thereby reducing the amount of power supplied to the outside. In the load increase mode, the system closes the second, fourth and sixth valve assemblies and opens the first, third and fifth valve assemblies. The molten salt heat storage subsystem 3 releases the stored heat energy to provide heat for the steam power cycle system, or to heat compressed air to drive the expander 47 to generate electricity. The solar heat collection subsystem 2 also directly provides energy for the steam power cycle. Multiple subsystems collaboratively release energy to quickly increase power generation to meet higher electricity demand and ensure stable operation of the power grid.

[0092] It is to be noted that the relationship terms, such as first and second, are used only to differentiate one entity or operation from another entity or operation, and do not necessarily require or imply any actual such relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a list of elements are not required to comprise only those elements, but can include other elements not expressly listed or inherent to such processes, methods, articles, or apparatuses. Without more limitations, an element defined by an "comprising" statement is not excluded from a process, method, article, or apparatus that comprises the element, even if the process, method, article, or apparatus also comprises other identical elements.

[0093] Finally, it should be noted that the above-mentioned only the preferred embodiments of the present application, only for the description of the technical solutions of the present application, and not for limiting the scope of protection of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, are included in the scope of protection of the present application.

Claims

1. An integrated hybrid energy storage wind-photovoltaic-thermal hybrid power generation system, characterized in that, The wind-solar-fire-storage combined power generation system is electrically connected with a power grid, and comprises a steam power cycle power generation subsystem, a solar heat collection subsystem, a molten salt heat storage subsystem, an advanced adiabatic compressed air energy storage subsystem, a photovoltaic power generation subsystem and a wind power generation subsystem. The steam power cycle power generation subsystem is connected with the molten salt heat storage subsystem and the advanced adiabatic compressed air energy storage subsystem through fourth and sixth valve assembly respectively; the solar heat collection subsystem is connected with the steam power cycle power generation subsystem and the molten salt heat storage subsystem through first and second valve assembly respectively; the molten salt heat storage subsystem is connected with the steam power cycle power generation subsystem and the advanced adiabatic compressed air energy storage subsystem through third and fifth valve assembly respectively; the photovoltaic power generation subsystem and the wind power generation subsystem are connected with the advanced adiabatic compressed air energy storage subsystem respectively. The steam power cycle power generation subsystem is used for providing main steam heat energy to the molten salt heat storage subsystem or providing electric energy to the advanced adiabatic compressed air energy storage subsystem. The solar heat collection subsystem is used for converting received solar energy into heat energy and providing the heat energy to the steam power cycle power generation subsystem and the molten salt heat storage subsystem. The molten salt heat storage subsystem is used for converting received solar heat energy or main steam heat energy into molten salt heat energy and providing the heat energy to the steam power cycle power generation subsystem or the advanced adiabatic compressed air energy storage subsystem. The advanced adiabatic compressed air energy storage subsystem is used for converting received electric energy into air internal energy of high-pressure air, and the air compression heat in the process is recovered to a steam turbine regenerative system of the steam power cycle power generation subsystem, and converting air internal energy of high-temperature and high-pressure air after heat exchange of the molten salt heat storage subsystem into mechanical energy. The photovoltaic power generation subsystem is used for converting received solar energy into electric energy and providing the electric energy to the advanced adiabatic compressed air energy storage subsystem. The wind power generation subsystem is used for converting received wind energy into electric energy and providing the electric energy to the advanced adiabatic compressed air energy storage subsystem. The first valve assembly is used for controlling solar heat energy to flow from the solar heat collection subsystem to the steam power cycle power generation subsystem; the second valve assembly is used for controlling solar heat energy to flow from the solar heat collection subsystem to the molten salt heat storage subsystem; the third valve assembly is used for controlling molten salt heat energy to flow from the molten salt heat storage subsystem to the steam power cycle power generation subsystem; the fourth valve assembly is used for controlling main steam heat energy to flow from the steam power cycle power generation subsystem to the molten salt heat storage subsystem; the fifth valve assembly is used for controlling molten salt heat energy to flow from the molten salt heat storage subsystem to the advanced adiabatic compressed air energy storage subsystem; and the sixth valve assembly is used for controlling electric energy to flow from the steam power cycle power generation subsystem to the advanced adiabatic compressed air energy storage subsystem.

2. The hybrid power generation system of claim 1, wherein, The first valve assembly includes a first valve, a third valve and a fourth valve; the second valve assembly includes a fifth valve and a sixth valve; the third valve assembly includes a second valve and a seventh valve; the fourth valve assembly includes an eighth valve and a ninth valve; the fifth valve assembly includes an eleventh valve and a twelfth valve; and the sixth valve assembly includes a tenth valve.

3. The hybrid power generation system of claim 2, wherein, The steam power cycle generating system includes a steam generator, a steam turbine, a first generator, a condenser, a low pressure heater, a deaerator, a high pressure heater, a high pressure feed water pump, a low pressure feed water pump; The outlet of the steam generator is connected with the steam turbine and a molten salt steam heat exchanger respectively; the first generator is coaxially connected with the steam turbine; the first stage extraction steam of the steam turbine is connected with the high pressure heater and the steam generator respectively; the second stage extraction steam of the steam turbine is connected with the deaerator; the third stage extraction steam of the steam turbine is connected with the low pressure heater; the exhaust steam of the steam turbine is connected with the condenser; the condenser is connected with the low pressure feed water pump; the low pressure feed water pump is connected with the low pressure heater; the water side inlet of the deaerator is connected with the low pressure heater; the water side outlet of the deaerator is connected with the high pressure feed water pump; the high pressure feed water pump is connected with the high pressure heater; the high pressure heater is connected with the steam generator; The steam generator is used for heating high pressure feed water to convert into steam or heating the first stage extraction steam of the steam turbine to convert into reheat steam; the steam turbine is used for converting received steam heat energy into mechanical energy; the first generator is used for converting received mechanical energy into electrical energy; the condenser is used for condensing the exhaust steam of the steam turbine into water; the low pressure heater is used for preheating low pressure feed water by the third stage extraction steam of the steam turbine; the deaerator is used for heating and removing dissolved oxygen in water by the second stage extraction steam of the steam turbine; the high pressure heater is used for heating high pressure feed water by the first stage extraction steam of the steam turbine; the high pressure feed water pump is used for pressurizing the water side outlet of the deaerator to high pressure feed water; and the low pressure feed water pump is used for pressurizing the outlet of the condenser to low pressure feed water.

4. The hybrid power generation system of claim 3, wherein, The solar energy collecting subsystem includes a collecting mirror field and a solar energy collector connected in sequence; The collecting mirror field is used for receiving solar energy; The solar energy collector is used for converting received solar energy into heat energy.

5. The hybrid power generation system of claim 4, wherein, The molten salt heat storage subsystem comprises a high-temperature molten salt tank, a low-temperature molten salt tank, a molten salt heat exchanger, and a molten salt steam heat exchanger; the outlet of the high-temperature molten salt tank is connected with the molten salt heat exchanger; the molten salt outlet of the molten salt heat exchanger is connected with the inlet of the low-temperature molten salt tank; the outlet of the low-temperature molten salt tank is connected with the molten salt steam heat exchanger and the solar heat collector respectively; the inlet of the high-temperature molten salt tank is connected with the molten salt steam heat exchanger and the molten salt outlet of the solar heat collector respectively; the water side outlet of the deaerator is connected with the first valve, the second valve, the molten salt heat exchanger, the solar heat collector, and the molten salt steam heat exchanger through the high-pressure feed water pump in parallel; the solar heat collector is connected with the molten salt heat exchanger through the third valve; the solar heat collector is connected with the high-temperature molten salt tank through the sixth valve; the high-temperature molten salt tank is connected with the molten salt heat exchanger through the seventh valve; the low-temperature molten salt tank is connected with the fourth valve, the fifth valve, and the solar heat collector in parallel; the main steam side outlet of the steam generator is connected with the molten salt steam heat exchanger through the eighth valve; the low-temperature molten salt tank is connected with the molten salt steam heat exchanger through the ninth valve. The high-temperature molten salt tank is used for storing high-temperature molten salt; the low-temperature molten salt tank is used for storing low-temperature molten salt; the molten salt heat exchanger is used for heating high-pressure feed water by using solar heat energy or molten salt heat storage energy; and the molten salt steam heat exchanger is used for converting main steam heat energy into molten salt heat storage energy.

6. The hybrid power generation system of claim 5, wherein, The advanced adiabatic compressed air energy storage subsystem comprises a compressor, an air heat exchanger, an electric motor, an air tank, a second generator, a molten salt air heat exchanger, and an expander. The compressor is coaxially connected with the electric motor; the outlet of the compressor is connected with the air heat exchanger; the air heat exchanger is connected with the air tank; the outlet of the molten salt air heat exchanger is connected with the expander; the expander is coaxially connected with the second generator; the water side outlet of the condenser is connected with the air heat exchanger through the low-pressure feed water pump and the tenth valve; the air outlet of the air tank is connected with the molten salt air heat exchanger through the eleventh valve; and the high-temperature molten salt tank is connected with the molten salt air heat exchanger through the twelfth valve. The electric motor is used for driving the compressor to convert electric energy into mechanical energy; the compressor is used for air compression to convert mechanical energy into air internal energy; the air heat exchanger is used for recovering air compression heat to heat low-pressure feed water; the air tank is used for storing high-pressure air; the molten salt air heat exchanger is used for converting molten salt heat storage energy to heat high-pressure air; the expander is used for high-pressure air expansion to convert air internal energy into mechanical energy, thereby driving the second generator to generate electricity; and the second generator is used for converting mechanical energy into electric energy.

7. The hybrid power generation system of claim 6, wherein, The wind power generation subsystem comprises a wind farm and a third generator connected in sequence. The wind farm is used for receiving wind energy. The third generator is used for converting the received wind energy into electric energy. 8.The combined wind-solar-thermal power generation system according to claim 7, characterized in that, The photovoltaic power generation subsystem comprises a photovoltaic power station and a fourth generator connected in sequence. The photovoltaic power station is used for receiving solar energy. The fourth generator is used for converting the received solar energy into electric energy.

9. A method for integrated hybrid energy storage wind-photovoltaic-thermal hybrid power generation, characterized in that, The wind-solar-thermal-storage combined power generation system according to any one of claims 1-8, comprising: when the wind-solar-thermal-storage combined power generation system is in energy storage operation, the second valve assembly, the fourth valve assembly, and the sixth valve assembly are controlled to be opened, and the first valve assembly, the third valve assembly, and the fifth valve assembly are controlled to be closed at the same time; when the wind-solar-thermal-storage combined power generation system is in energy release operation, the third valve assembly and the fifth valve assembly are controlled to be opened, and the first valve assembly, the second valve assembly, the fourth valve assembly, and the sixth valve assembly are controlled to be closed at the same time.

10. The method of claim 9, wherein, The method further comprises: when the wind-solar-thermal-storage combined power generation system starts the load reduction mode, the fourth valve assembly and the sixth valve assembly are controlled to be opened, and the first valve assembly, the second valve assembly, the third valve assembly, and the fifth valve assembly are controlled to be closed at the same time; when the wind-solar-thermal-storage combined power generation system starts the load increase mode, the second valve assembly, the fourth valve assembly, and the sixth valve assembly are controlled to be closed, and the first valve assembly, the third valve assembly, and the fifth valve assembly are controlled to be opened at the same time.

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