High-temperature energy storage system coupled with electric cooker and heat pump system

Abstract

The invention relates to the technical field of energy storage, in particular to a high-temperature energy storage system coupled with an electric cooker and a heat pump system, which comprises a wind power plant, a fused salt heat storage module connected with the wind power plant, a heat pump heat storage module connected with the wind power plant, and a steam power circulation module connected with the fused salt heat storage module and the heat pump heat storage module, wherein the heat pump heat storage module comprises a compressor connected with the wind power plant and an expansion machine connected with the compressor, and a heat regenerator and a cold supply heat exchanger are connected between the expansion machine and the compressor. The respective suitable heat storage temperatures of the fused salt heat storage system and the heat pump heat storage system are reasonably utilized, and compared with a traditional high-temperature heat pump energy storage system, under the condition that the initial parameters of a steam turbine of a steam power circulation system are guaranteed, the heat storage temperature of heat pump heat storage is effectively reduced, the parameters such as the pressure ratio of a compressor are reduced, and the energy efficiency is improved. And the design and manufacturing cost of the compressor is reduced, and the safety and stability of the system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of power generation, and in particular to a high-temperature energy storage system coupled with an electric cooker and a heat pump system. Background Art

[0002] As the installed capacity of renewable energy such as wind power continues to increase, its intermittency and volatility have brought huge challenges to the safe and stable operation of the power grid. The energy storage system can smooth out the intermittency and volatility of renewable energy, reduce the impact of new energy grid connection on the power grid, and improve the stability and flexibility of the power grid. Compared with energy storage technology routes such as electrochemical energy storage and electrical energy storage, thermal energy storage has obvious advantages in installed capacity, energy storage density, technical cost, and service life. Compared with pumped storage and compressed air energy storage, two mechanical energy storage technologies, thermal energy storage has many advantages such as small footprint, low cost, high energy storage density, small impact on the environment, and no geographical restrictions.

[0003] Heat pump power storage technology is an energy storage technology developed based on heat pump cycle and thermal energy storage technology. When the grid load is low, this technology uses the grid's surplus electricity to drive the heat pump cycle, thereby obtaining high-temperature heat energy and low-temperature cold energy relative to the ambient temperature. However, for heat pump power storage technology, the heat storage temperature is often low, which will lead to low initial parameters of the turbine in the energy release stage, affecting the system efficiency. If you want to increase its heat storage temperature, you need to increase the compressor compression ratio and the expansion ratio of the expander, which places high demands on the design and manufacture of the compressor and expander, which will undoubtedly increase the system cost and bring challenges to the safe and stable operation of the system.

[0004] In view of the above problems, the present invention proposes a new energy storage system that couples molten salt heat storage and heat pump electricity storage technology. The system uses the electric boiler of the molten salt heat storage subsystem to heat the molten salt heat storage medium using the surplus electricity that the wind farm cannot connect to the grid during the low-load period of the power grid, and converts the electricity into high-temperature thermal energy of the molten salt heat storage medium for storage. The initial parameters of the turbine of the energy release subsystem are effectively improved without increasing the operating parameters of the compressor and expander, thereby improving the system efficiency. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the problems of low heat storage temperature, low initial parameters of turbine of energy release subsystem and low system efficiency in current heat pump electricity storage technology, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide a high temperature energy storage system coupling an electric cooker and a heat pump system.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-temperature energy storage system coupling an electric boiler and a heat pump system, comprising a wind farm, a molten salt heat storage module connected to the wind farm, a heat pump heat storage module connected to the wind farm, and a steam power cycle module connected to the molten salt heat storage module and the heat pump heat storage module, the heat pump heat storage module and the molten salt heat storage module are used to convert the electric energy that the wind farm cannot be connected to the grid into heat energy for storage during the low-load period of the power grid, and the steam power cycle module is used to convert the stored heat energy into electric energy and transmit it to the power grid during the high-load period of the power grid; wherein the heat pump heat storage module comprises a compressor connected to the wind farm, an expander connected to the compressor, and a regenerator and a cooling heat exchanger are connected between the expander and the compressor; the heat pump heat storage module also comprises a heat transfer oil hot tank and a heat transfer oil cold tank, the heat transfer oil hot tank and the heat transfer oil cold tank are connected through a first heat exchanger and a second heat exchanger, and the compressor is also connected to the first heat exchanger.

[0009] As a preferred solution of the high-temperature energy storage system coupled with the electric boiler and the heat pump system described in the present invention, the molten salt heat storage module includes an electric boiler connected to the wind farm, a molten salt cold tank and a molten salt hot tank connected to the electric boiler, and the molten salt cold tank and the molten salt hot tank are also connected to a molten salt heat exchanger.

[0010] As a preferred solution of the high-temperature energy storage system of the coupled electric boiler and heat pump system described in the present invention, the steam power cycle module includes a steam turbine connected to the molten salt heat exchanger, a condenser connected to the steam turbine, and a water pump connected to the condenser.

[0011] As a preferred solution of the high-temperature energy storage system coupled with the electric boiler and the heat pump system described in the present invention, the molten salt heat exchanger, the regenerator, the first heat exchanger and the second heat exchanger are divided into a cold fluid side and a hot fluid side, hereinafter referred to as the cold side and the hot side, and the cold side and the hot side are both provided with an input end and an output end.

[0012] As a preferred solution of the high-temperature energy storage system of the coupling electric boiler and heat pump system described in the present invention, the electric boiler is electrically connected to the wind farm, the output end of the molten salt cold tank is connected to the input end of the electric boiler, the output end of the electric boiler is connected to the input end of the molten salt hot tank, the output end of the molten salt hot tank is connected to the hot side input end of the molten salt heat exchanger, and the hot side output end of the molten salt heat exchanger is connected to the input end of the molten salt cold tank.

[0013] As a preferred solution of the high-temperature energy storage system coupled with the electric cooker and the heat pump system described in the present invention, the wind farm is electrically connected to the compressor, the output end of the compressor is connected to the hot side input end of the first heat exchanger, the hot side output end of the first heat exchanger is connected to the hot side input end of the regenerator, the hot side output end of the regenerator is connected to the input end of the expander, the output end of the expander is connected to the input end of the cooling heat exchanger, the output end of the cooling heat exchanger is connected to the cold side input end of the regenerator, and the cold side output end of the regenerator is connected to the input end of the compressor.

[0014] As a preferred solution of the high-temperature energy storage system coupled with the electric cooker and the heat pump system described in the present invention, the output end of the thermal oil hot tank is connected to the hot side input end of the second heat exchanger, the hot side output end of the second heat exchanger is connected to the input end of the thermal oil cold tank, the output end of the thermal oil cold tank is connected to the cold side input end of the first heat exchanger, and the cold side output end of the first heat exchanger is connected to the input end of the thermal oil hot tank.

[0015] As a preferred solution of the high-temperature energy storage system of the coupled electric boiler and heat pump system described in the present invention, the cold side output end of the molten salt heat exchanger is connected to the input end of the steam turbine, the output end of the steam turbine is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the water pump, the output end of the water pump is connected to the cold side input end of the second heat exchanger, and the cold side output end of the second heat exchanger is connected to the cold side input end of the molten salt heat exchanger.

[0016] As a preferred solution of the high-temperature energy storage system coupled with the electric cooker and the heat pump system of the present invention, a motor is provided between the wind farm and the compressor. During the low-load period of the power grid, the wind farm supplies power to the motor, and the motor drives the compressor.

[0017] As a preferred solution of the high-temperature energy storage system coupled with the electric boiler and the heat pump system of the present invention, the steam turbine is coaxially provided with a generator, and the generator supplies power to the grid during the high-load period of the grid.

[0018] Beneficial effects of the present invention: During the period of low load of the power grid, the present invention converts the surplus electric energy that the wind farm cannot connect to the grid into heat energy for storage, and during the period of high load of the power grid, the stored heat energy is converted into electric energy and transmitted to the power grid, while also being able to provide cooling to the outside. The present invention rationally utilizes the appropriate heat storage temperatures of the two systems of molten salt heat storage and heat pump heat storage. Compared with the traditional high-temperature heat pump energy storage system, under the condition of ensuring the initial parameters of the steam turbine steam of the steam power cycle system, the heat storage temperature of the heat pump heat storage is effectively reduced, the parameters such as the compressor pressure ratio are reduced, the design and manufacturing costs of the compressor are reduced, and the safety and stability of the system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 It is an overall schematic diagram of a high-temperature energy storage system coupling an electric cooker and a heat pump system. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0024] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0025] Reference Figure 1 The present invention provides a high-temperature energy storage system coupling an electric boiler and a heat pump system, comprising a wind farm 100, and also comprising a molten salt heat storage module 200 connected to the wind farm 100, a heat pump heat storage module 300 connected to the wind farm 100, and a steam power cycle module 400 connected to the molten salt heat storage module 200 and the heat pump heat storage module 300. The molten salt heat storage module 200 and the heat pump heat storage module 300 are used to convert the electric energy that the wind farm cannot be connected to the grid into heat energy for storage during the low-load period of the power grid, and the steam power cycle module 400 is used to convert the stored heat energy into electric energy and transmit it to the power grid during the high-load period of the power grid.

[0026] Among them, the molten salt thermal storage module 200 is used to convert electrical energy into high-temperature thermal energy of the molten salt thermal storage medium and store it in the energy storage stage, and use the high-temperature thermal energy stored in the molten salt thermal storage medium to heat the working medium in the energy release stage; the heat pump thermal storage module 300 is used to convert electrical energy into thermal energy of heat transfer oil and store it in the energy storage stage, and supply cold energy to the outside, and use the thermal energy stored in the heat transfer oil to heat the working medium in the energy release stage; the steam power cycle module 400 is used to convert the thermal energy stored in the heat pump thermal storage module 300 and the molten salt thermal storage module 200 in the energy storage stage into electrical energy and transmit it to the power grid when the power grid load is high.

[0027] Furthermore, the molten salt heat storage module 200 includes an electric boiler 201 connected to the wind farm 100, a molten salt cold tank 202 and a molten salt hot tank 203 connected to the electric boiler 201, and the molten salt cold tank 202 and the molten salt hot tank 203 are also connected to a molten salt heat exchanger 204. During the low-load period of the power grid, the electric boiler 201 uses the surplus electric energy of the wind farm 100 to heat the molten salt heat storage medium in the molten salt cold tank 202, thereby realizing the conversion and storage of electric energy into thermal energy. The molten salt heat exchanger 204 is used to exchange heat between the molten salt heat storage medium and the working fluid of the steam power cycle module 400, and transfer the heat energy stored in the molten salt heat storage medium to water vapor.

[0028] Furthermore, the electric boiler 201 is electrically connected to the wind farm 100, the output end of the molten salt cold tank 202 is connected to the input end of the electric boiler 201, the output end of the electric boiler 201 is connected to the input end of the molten salt hot tank 203, the output end of the molten salt hot tank 203 is connected to the hot side input end of the molten salt heat exchanger 204, and the hot side output end of the molten salt heat exchanger 204 is connected to the input end of the molten salt cold tank 202. When storing energy, the low-temperature molten salt heat storage medium enters the electric boiler 201 from the molten salt cold tank 202, the electric boiler 201 heats the molten salt heat storage medium, and the heated high-temperature molten salt heat storage medium enters the molten salt hot tank 203 from the electric boiler 201 to complete heat storage; when releasing energy, the high-temperature molten salt heat storage medium enters the molten salt heat exchanger 204 to release heat, and after the heat is exchanged, the low-temperature molten salt heat storage medium returns to the molten salt cold tank 202 for storage.

[0029] Among them, the heat pump heat storage module 300 includes a compressor 301 connected to the wind farm 100, an expander 304 connected to the compressor 301, and a heat regenerator 302 and a cooling heat exchanger 303 are connected between the expander 304 and the compressor 301; the heat pump heat storage module 300 also includes a thermal oil hot tank 305 and a thermal oil cold tank 307, the thermal oil hot tank 305 and the thermal oil cold tank 307 are connected through a first heat exchanger 306 and a second heat exchanger 308, and the compressor 301 is also connected to the first heat exchanger 306.

[0030] The first heat exchanger 306 and the second heat exchanger 308 are both divided into a cold side and a hot side, and both the cold side and the hot side are provided with an input end and an output end. The first heat exchanger 306 is used to heat the heat transfer oil, and the second heat exchanger 308 is used to heat the working medium water of the steam power cycle by using the heat of the heat transfer oil to heat and vaporize it with a certain degree of superheat.

[0031] Specifically, the wind farm 100 is electrically connected to the compressor 301, the output end of the compressor 301 is connected to the hot side input end of the first heat exchanger 306, the hot side output end of the first heat exchanger 306 is connected to the hot side input end of the regenerator 302, the cold side output end of the regenerator 302 is connected to the input end of the compressor 301, the hot side output end of the regenerator 302 is connected to the input end of the expander 304, the output end of the expander 304 is connected to the input end of the cooling heat exchanger 303, the output end of the cooling heat exchanger 303 is connected to the cold side input end of the regenerator 302, and the cooling heat exchanger 303 is provided with a water supply side W and a cooling side C. The water supply side W is connected to the external room temperature water source, and the cooling side can transport the cooled water to the outside. The circulating working fluid in the heat pump heat storage module 300 is carbon dioxide, which can convert electrical energy into heat energy and cold energy through the heat pump cycle. The compressor 301 compresses the working fluid carbon dioxide to a high temperature and high pressure state. The working fluid carbon dioxide in the high temperature and high pressure state enters the first heat exchanger 306 to exchange heat with the heat transfer oil. The high pressure carbon dioxide after the heat exchange with the heat transfer oil enters the regenerator 302. The regenerator 302 can use the carbon dioxide after the heat exchange with the heat transfer oil to heat the carbon dioxide about to enter the compressor 301, thereby increasing the compressor inlet carbon dioxide temperature. The cooling heat exchanger 303 is used to output cold energy to the outside using the low temperature and low pressure carbon dioxide after expansion work, and the low temperature and low pressure carbon dioxide therein is also heated to room temperature.

[0032] Furthermore, the output end of the thermal oil hot tank 305 is connected to the hot side input end of the second heat exchanger 308, the hot side output end of the second heat exchanger 308 is connected to the input end of the thermal oil cold tank 307, the output end of the thermal oil cold tank 307 is connected to the cold side input end of the first heat exchanger 306, and the cold side output end of the first heat exchanger 306 is connected to the input end of the thermal oil hot tank 305. The thermal oil transfers and stores the heat energy in the working fluid carbon dioxide through its own heat storage capacity, and can transfer the heat energy to the working fluid water in the steam power cycle, so that it is heated and vaporized with a certain degree of superheat.

[0033] Among them, the steam power cycle module 400 includes a steam turbine 401 connected to the molten salt heat exchanger 204, a condenser 402 connected to the steam turbine 401, and a water pump 403 connected to the condenser 402. The steam turbine 401 uses the thermal energy stored in the molten salt heat storage module 200 and the heat pump heat storage module 300 to generate electricity, and the water vapor is condensed into liquid through the condenser 402.

[0034] Further, the cold side output end of the molten salt heat exchanger 204 is connected to the input end of the steam turbine 401, the output end of the steam turbine 401 is connected to the input end of the condenser 402, the output end of the condenser 402 is connected to the input end of the water pump 403, the output end of the water pump 403 is connected to the cold side input end of the second heat exchanger 308, and the cold side output end of the second heat exchanger 308 is connected to the cold side input end of the molten salt heat exchanger 204. When the power grid is highly loaded, the heat pump heat storage module 300 and the molten salt heat storage module 200 successively heat the working medium water of the steam power module, converting it into water vapor with a large superheat, and then the water vapor enters the steam turbine 401 to do work.

[0035] Furthermore, a generator G is coaxially disposed on the steam turbine 401. When the power grid is in a high-load state, the steam turbine 401 drives the generator G to supply power to the power grid.

[0036] The energy storage system has two working states: energy storage stage and energy release stage:

[0037] Energy storage stage: When the grid load is low, the system is in the energy storage stage, and the molten salt heat storage medium stored in the molten salt cold tank 202 enters the electric boiler 201. The electric boiler 201 uses the surplus electric energy of the wind farm 100 to heat the molten salt heat storage medium entering therein, and converts the electric energy into the thermal energy of the molten salt heat storage medium. The molten salt heat storage medium heated in the electric boiler 201 is stored in the molten salt hot tank 203.

[0038] At the same time, the motor M uses the surplus electric energy of the wind farm 100 to drive the compressor 301 to compress the carbon dioxide, compressing the carbon dioxide to a high temperature and high pressure state, and the high temperature and high pressure carbon dioxide enters the first heat exchanger 306 to exchange heat with the heat transfer oil stored in the heat transfer oil cold tank 307, transferring the heat energy of the carbon dioxide to the heat transfer oil, and the heat transfer oil that has completed the heat exchange in the first heat exchanger 306 is stored in the heat transfer oil hot tank 305, and the carbon dioxide that has completed the heat exchange in the first heat exchanger 306 enters the regenerator 302 to exchange heat with the carbon dioxide flowing out of the cooling heat exchanger 303, transferring the heat energy of the carbon dioxide to the heat transfer oil. The carbon dioxide flowing out of the cooling heat exchanger 303 is transferred to the high-pressure carbon dioxide that has completed the heat exchange, and enters the expander 304 to expand and perform work to output mechanical energy. The high-pressure carbon dioxide that has completed the expansion work in the expander 304 becomes low-temperature and low-pressure carbon dioxide, and then the low-temperature and low-pressure carbon dioxide enters the cooling heat exchanger 303, cools the normal-temperature water into low-temperature water to supply cold energy to the outside, and the low-temperature and low-pressure carbon dioxide is also heated to room temperature, and then the carbon dioxide enters the regenerator 302 to be further heated, and the heated carbon dioxide enters the compressor 301 to be compressed to a high-temperature and high-pressure state.

[0039] Energy release stage: When the grid load is high, the system is in the energy release stage. The molten salt heat storage medium stored in the molten salt hot tank 203 enters the molten salt heat exchanger 204, and the high-temperature heat transfer oil stored in the heat transfer oil hot tank 305 enters the second heat exchanger 308. The working medium water enters the second heat exchanger 308 under the action of the water pump 403. In the second heat exchanger, the high-temperature heat transfer oil transfers the heat energy it carries to the working medium water, and heats it to become water vapor with a certain degree of superheat. Then the water vapor enters the molten salt heat exchanger 204. In the molten salt heat exchanger 204, the molten salt heat storage medium exchanges heat with the water vapor, transfers its heat energy to the water vapor, and is further heated by the molten salt heat storage medium to increase the superheat. Then the high-temperature and high-pressure water vapor enters the steam turbine 401 to expand and work, driving the generator G to generate electricity and transmit electricity to the grid. The molten salt heat storage medium that has completed heat exchange is stored in the molten salt cold tank 202, and the heat transfer oil that has completed heat exchange is stored in the heat transfer oil cold tank 307.

[0040] Table 1 is a table of key node status parameters of the present invention:

[0041] Pressure / kPa Temperature / ℃ Flow rate / kg / s Compressor 301 inlet 1000 45 10 Compressor 301 outlet 15000 290 10 Expander 304 inlet 15000 41 10 Expander 304 outlet 1000 -40 10 Steam turbine 401 entrance 5000 560 3.048 Steam turbine 401 outlet 10 45.8 3.048

[0042] Table 2 is a table of system performance data of the present invention:

[0043]

[0044]

[0045] It can be seen from the above table that the compressor pressure ratio and the expansion ratio of the expander of the energy storage system proposed by the present invention are only 15, while the turbine inlet temperature is as high as 560°C, and the round-trip efficiency reaches 61%. Compared with the heat pump energy storage system in the prior art, the present invention effectively reduces the heat storage temperature of the heat pump heat storage, reduces the compressor pressure ratio and other parameters, reduces the design and manufacturing cost of the compressor, and effectively improves the round-trip efficiency of the energy storage system while ensuring the initial parameters of the steam turbine of the steam power cycle system. At the same time, it has a charging capacity of 27.78MW·h, a discharging capacity of 16.95MW·h, and a cooling capacity of 23.69MW·h. Therefore, the present invention has the advantages of high round-trip efficiency, large charging and discharging capacity, and multi-generation.

[0046] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0047] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0048] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high temperature energy storage system coupling an electric cooker and a heat pump system, characterized in that: The invention comprises a wind farm (100), and further comprises: A molten salt heat storage module (200) connected to a wind farm (100), a heat pump heat storage module (300) connected to the wind farm (100), and a steam power cycle module (400) connected to the molten salt heat storage module (200) and the heat pump heat storage module (300), wherein the molten salt heat storage module (200) and the heat pump heat storage module (300) are used to convert the electric energy of the wind farm (100) that cannot be connected to the grid into heat energy for storage during a period of low load of the grid, and the steam power cycle module (400) is used to convert the stored heat energy into electric energy and transmit it to the grid during a period of high load of the grid; The heat pump heat storage module (300) comprises a compressor (301) connected to the wind farm (100), an expander (304) connected to the compressor (301), and a regenerator (302) and a cooling heat exchanger (303) are connected between the expander (304) and the compressor (301); The heat pump heat storage module (300) further comprises a heat transfer oil hot tank (305) and a heat transfer oil cold tank (307); the heat transfer oil hot tank (305) and the heat transfer oil cold tank (307) are connected via a first heat exchanger (306) and a second heat exchanger (308); and the compressor (301) is also connected to the first heat exchanger (306).

2. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 1, characterized in that: The molten salt heat storage module (200) comprises an electric boiler (201) connected to a wind farm (100), a molten salt cold tank (202) and a molten salt hot tank (203) connected to the electric boiler (201), and the molten salt cold tank (202) and the molten salt hot tank (203) are also connected to a molten salt heat exchanger (204).

3. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 2, characterized in that: The steam power cycle module (400) includes a steam turbine (401) connected to a molten salt heat exchanger (204), a condenser (402) connected to the steam turbine (401), and a water pump (403) connected to the condenser (402).

4. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 3, characterized in that: The molten salt heat exchanger (204), the regenerator (302), the first heat exchanger (306) and the second heat exchanger (308) are divided into a cold fluid side and a hot fluid side, hereinafter referred to as the cold side and the hot side, and the cold side and the hot side are both provided with an input end and an output end.

5. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 4, characterized in that: The electric boiler (201) is electrically connected to the wind farm (100); the output end of the molten salt cold tank (202) is connected to the input end of the electric boiler (201); the output end of the electric boiler (201) is connected to the input end of the molten salt hot tank (203); the output end of the molten salt hot tank (203) is connected to the hot side input end of the molten salt heat exchanger (204); and the hot side output end of the molten salt heat exchanger (204) is connected to the input end of the molten salt cold tank (202).

6. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 5, characterized in that: The wind farm (100) is electrically connected to the compressor (301); the output end of the compressor (301) is connected to the hot side input end of the first heat exchanger (306); the hot side output end of the first heat exchanger (306) is connected to the hot side input end of the regenerator (302); the hot side output end of the regenerator (302) is connected to the input end of the expander (304); the output end of the expander (304) is connected to the input end of the cooling heat exchanger (303); the output end of the cooling heat exchanger (303) is connected to the cold side input end of the regenerator (302); and the cold side output end of the regenerator (302) is connected to the input end of the compressor (301).

7. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 6, characterized in that: The output end of the heat transfer oil hot tank (305) is connected to the hot side input end of the second heat exchanger (308), the hot side output end of the second heat exchanger (308) is connected to the input end of the heat transfer oil cold tank (307), the output end of the heat transfer oil cold tank (307) is connected to the cold side input end of the first heat exchanger (306), and the cold side output end of the first heat exchanger (306) is connected to the input end of the heat transfer oil hot tank (305).

8. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 7, characterized in that: The cold side output end of the molten salt heat exchanger (204) is connected to the input end of the steam turbine (401), the output end of the steam turbine (401) is connected to the input end of the condenser (402), the output end of the condenser (402) is connected to the input end of the water pump (403), the output end of the water pump (403) is connected to the cold side input end of the second heat exchanger (308), and the cold side output end of the second heat exchanger (308) is connected to the cold side input end of the molten salt heat exchanger (204).

9. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 8, characterized in that: An electric motor (M) is provided between the wind farm (100) and the compressor (301); during a period of low load on the power grid, the wind farm (100) supplies power to the electric motor (M), and the electric motor (M) drives the compressor (301).

10. The high temperature energy storage system coupled with an electric cooker and a heat pump system as claimed in claim 9, characterized in that: The steam turbine (401) is coaxially provided with a generator (G), and during a period of high load on the power grid, the generator (G) supplies power to the power grid.

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