A micro compressed air energy storage system for power-cooling combined with solar-thermal system on the distribution side

Abstract

The present application discloses a power-cooling and power-supply micro-compressed air energy storage system on the distribution network side of a coupled solar-thermal system, comprising: a solar photovoltaic heat collection subsystem for collecting heat; an energy storage subsystem for compressing low-temperature, low-pressure air using the electricity provided by the distribution network to obtain compressed air; an energy release subsystem for exchanging heat between the compressed air and the heat to form high-temperature, high-pressure gas, which then expands and performs work. The output expansion work drives the generator to generate electricity to provide electricity, and the exhaust gas after the expansion work is transmitted to the cold storage and pre-cooling air subsystem; the cold storage and pre-cooling air subsystem is used to cool the exhaust gas after the expansion work, and transmit the obtained low-temperature exhaust gas as cold to the cooling users on the distribution network side. When the energy storage subsystem is in operation, the input air of the energy storage subsystem is cooled to obtain low-temperature, low-pressure air. The system of the present application can recover expansion work, reduce the energy consumption and cost of the air compressor, and provide cooling, heating, and electricity to users, thereby improving energy utilization.

Description

Technical Field

[0001] The present application relates to the field of energy utilization technology, and in particular to a power-cooling combined supply micro-compressed air energy storage system on the distribution network side of a coupled solar-thermal system. Background Art

[0002] Currently, physical energy storage systems, such as compressed air energy storage systems, are primarily used in large-scale energy storage environments, storing and releasing electrical energy in transmission networks to achieve peak shaving and valley filling for large power grids. However, research on micro-compressed air energy storage systems for distribution networks is relatively limited. As the penetration of distributed renewable energy sources, such as photovoltaic and wind power, continues to increase in distribution networks, the application scenarios of distributed energy storage are gradually emerging to ensure the safe and stable operation of distribution networks. Long-life micro-compressed air energy storage systems are also an important type of distributed energy storage.

[0003] The form of air compression in a compressed air energy storage system that requires the least amount of work is isothermal compression. However, in reality, the compression process is relatively fast, and the gas cannot fully exchange heat during the compression process, making it difficult to achieve isothermal compression. The actual compression process is closer to an adiabatic process. In addition, due to the high gas pressure in the air storage chamber, the final temperature of the air compression is relatively high, which has a great impact on the stable operation of the materials and the system. In addition, the high-temperature and high-pressure compressed air makes the volume ratio of the air storage chamber lower, thereby effectively reducing the compressed air temperature, which can reduce the energy consumption and cost of the compressor, increase the effective air storage capacity of the air storage chamber, and improve energy utilization.

[0004] The prior art discloses a compressed air energy storage system that recovers and stores the cold energy in the exhaust gas of the expander, and uses it to reduce the gas storage temperature in the gas storage chamber and increase the effective gas storage capacity. However, this type of compressed air energy storage system for exhaust gas recovery only recovers and stores the cold energy in the exhaust gas to reduce the gas storage temperature in the gas storage chamber, and does not fully utilize the expansion work of the compressed air. Therefore, studying the distribution network-side electric cooling and co-supply micro-compressed air energy storage system coupled with the solar thermal system is a technical problem that needs to be solved urgently by those skilled in the art. On the one hand, it can use solar thermal resources to improve the efficiency of the micro-compressed air energy storage system, and at the same time, it can also make full use of the cold energy discharged by the micro-compressed air energy storage system to meet the cooling needs of users on the distribution network side. Summary of the Invention

[0005] The present application provides a distribution-side electric cooling and cogeneration micro compressed air energy storage system coupled with a solar thermal system, which is used to improve the existing compressed air energy storage system, which does not fully utilize the expansion work of compressed air and has a technical problem of low energy utilization.

[0006] In view of this, the first aspect of the present application provides a distribution-side electric cooling and supply micro compressed air energy storage system coupled with a solar thermal system, comprising: a solar photovoltaic heat collection subsystem, an energy storage subsystem, an energy release subsystem, and a cold storage and pre-cooling air subsystem;

[0007] The solar photovoltaic heat collection subsystem includes a solar heat collector for collecting heat;

[0008] The energy storage subsystem includes an air compressor connected to the power distribution network and configured to compress input low-temperature and low-pressure air using the electrical energy provided by the power distribution network to obtain compressed air;

[0009] The energy release subsystem includes a preheater and a first expander. One inlet of the preheater is used to obtain heat from the solar photovoltaic heat collection subsystem, and the other inlet obtains the compressed air. The energy release subsystem is used to perform heat exchange between the compressed air and the heat to form high-temperature and high-pressure gas, expand the high-temperature and high-pressure gas to produce work, and output the expansion work to drive the generator to generate electricity to provide electrical energy. The exhaust gas after the expansion work is transmitted to the cold storage and pre-cooling air subsystem;

[0010] The cold storage and pre-cooling air subsystem includes a refrigeration device and a cold storage cooling device, which are used to cool the exhaust gas after expansion and transfer the obtained low-temperature exhaust gas as cooling energy to the cooling users on the distribution network side, and when the energy storage subsystem is in operation, cool the input air of the energy storage subsystem to obtain low-temperature and low-pressure air;

[0011] The refrigeration device includes a second expander, a coupling and a regenerator;

[0012] The input end of the second expander is connected to the output end of the preheater and the output end of the regenerator respectively, the output end of the second expander is connected to the input end of the air compressor through the coupling, and the input end of the regenerator is connected to the output end of the air compressor.

[0013] Optionally, the solar photovoltaic heat collection subsystem further includes a hot water tank, a cold water tank and a first liquid pump;

[0014] The input end of the solar thermal collector is connected to the output end of the first liquid pump, the output end of the solar thermal collector is connected to the input end of the hot water tank, and the output end of the hot water tank is connected to the input end of the preheater;

[0015] The input end of the first liquid pump is connected to the output end of the cold water tank, and the input end of the cold water tank is connected to the output end of the preheater;

[0016] A heat collecting liquid flows in the solar thermal collector, and the heat collecting liquid is used to absorb the heat collected by the solar thermal collector and then transfer it to the hot water tank for storage;

[0017] The preheater is used to perform heat exchange between the compressed air and the heat collecting liquid to form high-temperature and high-pressure gas, and to transfer the exchanged heat collecting liquid to the cold water tank. The low-temperature heat collecting liquid in the cold water tank is pressurized and transferred to the solar collector for heat absorption through the first liquid pump.

[0018] Optionally, the solar photovoltaic heat collection subsystem further includes a first flow regulating valve, which is arranged between the hot water tank and the preheater.

[0019] Optionally, the energy storage subsystem further includes: a first control valve and a gas storage chamber;

[0020] The first control valve is arranged between the input end of the air storage chamber and the output end of the air compressor, and is used to control the input end of the air storage chamber;

[0021] The air storage chamber is used to store the compressed air.

[0022] Optionally, the energy release subsystem further includes a second control valve, which is arranged between the output end of the gas storage chamber and the input end of the preheater and is used to control the output end of the gas storage chamber.

[0023] Optionally, the cold storage cooling device includes: a cold storage device, an evaporator, a second flow regulating valve, a precooler, a liquid storage tank and a second liquid pump;

[0024] The input end of the evaporator is respectively connected to the output end of the first expander, the output end of the second expander and the output end of the liquid storage tank through the second liquid pump. The output end of the evaporator is connected to the input end of the cold accumulator. The output end of the cold accumulator is connected to the input end of the precooler through the second flow regulating valve. The output end of the precooler is connected to the input end of the liquid storage tank.

[0025] It can be seen from the above technical solutions that this application has the following advantages:

[0026] The distribution network side electric cooling and supply micro compressed air energy storage system of the coupled solar thermal system provided in the present application collects heat through a solar photovoltaic collection subsystem, provides electric energy to the air compressor through the distribution network to drive it to work and obtain compressed air, and realizes heat exchange between the compressed air and the collected heat through the preheater in the energy release subsystem to form high-temperature and high-pressure gas, and then expands the high-temperature and high-pressure gas through the first expander to perform work, and the output expansion work drives the generator to generate electricity to provide electricity, and the exhaust gas after the expansion work is transmitted to the cold storage and pre-cooling air subsystem for cooling, and the obtained low-temperature exhaust gas is transmitted to the cooling users on the distribution network side to provide cooling for the users on the distribution network side. The present application uses expansion work to drive the generator to generate electricity to provide electricity, uses solar heat to improve efficiency, and improves energy utilization. In the process of energy storage and release, cooling and heat can be provided to maximize the energy utilization of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of a grid-side electric cooling and power generation micro-compressed air energy storage system coupled with a solar-thermal system provided in an embodiment of the present application;

[0029] Among them, 1: air compressor; 2: air storage chamber; 3: preheater; 4: second expander; 5: coupling; 9: evaporator; 10: second liquid pump; 11: liquid storage; 12: precooler; 13: second flow regulating valve; 14: cold storage; 15: cold water tank; 16: first liquid pump; 17: solar collector; 18: hot water tank; 19: first flow regulating valve; 20: second control valve; 21: first control valve; 22: first expander; 24: regenerator; 25: distribution network. DETAILED DESCRIPTION

[0030] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0031] For easier understanding, please refer to Figure 1, the embodiment of the present application provides a distribution-side electric cooling and supply micro compressed air energy storage system coupled with a solar thermal system, comprising: a solar photovoltaic heat collection subsystem, an energy storage subsystem, an energy release subsystem, and a cold storage and pre-cooling air subsystem;

[0032] The solar photovoltaic heat collection subsystem includes a solar heat collector 17 for collecting heat;

[0033] The energy storage subsystem includes an air compressor 1, which is connected to the power distribution network 25 and is used to compress the input low-temperature and low-pressure air using the electric energy provided by the power distribution network 25 to obtain compressed air;

[0034] The energy release subsystem includes a preheater 3 and a first expander 22. One inlet of the preheater 3 is used to obtain heat from the solar photovoltaic heat collection subsystem, and the other inlet obtains compressed air. The energy release subsystem is used to exchange heat between the compressed air and the heat to form high-temperature and high-pressure gas, expand the high-temperature and high-pressure gas to produce work, and output the expansion work to drive the generator to generate electricity to provide electricity. The exhaust gas after the expansion work is transmitted to the cold storage and pre-cooling air subsystem;

[0035] The cold storage and pre-cooling air subsystem includes a refrigeration device and a cold storage cooling device, which are used to cool the exhaust gas after expansion work, and transmit the obtained low-temperature exhaust gas as cooling energy to the distribution network 25. When the energy storage subsystem is running, the input air of the energy storage subsystem is cooled to obtain low-temperature and low-pressure air.

[0036] In the embodiment of the present application, the solar photovoltaic heat collection subsystem specifically includes a solar heat collector 17, a first flow regulating valve 19, a hot water tank 18, a cold water tank 15 and a first liquid pump 16;

[0037] The input of the solar thermal collector 17 is connected to the output of a first liquid pump 16, which is then connected to the input of a hot water tank 18, which is then connected to the input of the preheater 3. The input of the first liquid pump 16 is then connected to the output of a cold water tank 15, which is then connected to the output of the preheater 3. A first flow control valve 19 is provided between the hot water tank and the preheater. The solar thermal collector 17 includes a heat collecting tube, through which flows a heat collecting liquid. This heat collecting liquid absorbs heat collected by the solar thermal collector 17 and is then transferred to the hot water tank 15 for storage. The heat collecting liquid exchanges heat with the compressed air within the preheater 3. After this heat exchange, the heat collecting liquid flows back to the cold water tank 15. The low-temperature heat collecting liquid is pressurized by the first liquid pump 16 and then returned to the solar thermal collector 17 to absorb heat. The heat collecting liquid has a high temperature and is highly usable, allowing it to provide heat to users. Common water can be used as the heat collecting liquid.

[0038] The energy storage subsystem specifically includes: an air compressor 1, a first control valve 21 and an air storage chamber 2;

[0039] The first control valve 21 is arranged between the input end of the air storage chamber 2 and the output end of the air compressor 1, and is used to control the input end of the air storage chamber 2; the air storage chamber 2 is used to store compressed air.

[0040] During the energy storage process, the first control valve 21 is opened, and low-temperature, low-pressure air enters the air compressor 1 to be compressed into high-temperature, high-pressure compressed air, which is then stored in the air storage chamber 2. The energy storage subsystem includes an air compressor, and multi-stage compression can also be used. If multiple air compressors are required, an intercooler can be arranged to achieve inter-stage cooling. The air compressor is powered by the electricity provided by the distribution network 25, and the electricity provided by the distribution network 25 drives the air compressor to work and compress the air. It should be noted that the air compressor can also be powered by the electricity generated by the solar photovoltaic collection subsystem, and can also be coupled with other unstable energy sources to absorb low-peak loads of the power grid and waste electricity from renewable energy.

[0041] The energy release subsystem specifically comprises a preheater 3, a first expander 22, and a second control valve 20. The second control valve 20 is located between the output of the air storage chamber 2 and the input of the preheater 3 and controls the output of the air storage chamber 2. The output of the preheater 3 is connected to the input of the first expander 22. During the energy release process, the second control valve 20 opens, releasing compressed air from the air storage chamber 2. The compressed air enters the preheater 3, where it undergoes heat exchange with the heat-collecting liquid within the preheater 3, forming high-temperature, high-pressure gas that enters the first expander 22 for expansion and work. The first expander 22 outputs this expansion work, which drives the generator to generate electricity, providing power. Excess electricity can be promptly transmitted to the power grid. Furthermore, the exhaust gas from the compressed air after expansion in the first expander 22 is at a lower temperature and can be used for cooling, providing cooling for the cold storage medium. The energy release subsystem consists of a single expander, but a multi-stage expansion system can also be used, requiring multiple expanders. When using multiple expanders, an intermediate heat exchanger can be installed to raise the inlet temperature of the next-stage expander and increase the expander's output power.

[0042] The cold storage and pre-cooling air subsystem includes a refrigeration device and a cold storage cooling device, and the refrigeration device includes a second expander 4, a coupling 5 and a regenerator 24;

[0043] The input end of the second expander 4 is connected to the output end of the preheater 3 and the output end of the regenerator 24 respectively. The output end of the second expander 4 is connected to the input end of the air compressor 1 through the coupling 5. The input end of the regenerator 24 is connected to the output end of the air compressor 1.

[0044] The cold storage cooling device includes: a cold storage device 14, an evaporator 9, a second flow regulating valve 13, a precooler 12, a liquid storage tank 11 and a second liquid pump 10;

[0045] The input end of the evaporator 9 is respectively connected to the output end of the first expander 22, the output end of the second expander 4 and the output end of the liquid storage tank 11 through the second liquid pump 10. The output end of the evaporator 9 is connected to the input end of the cold storage tank 14. The output end of the cold storage tank 14 is connected to the input end of the precooler 12 through the second flow regulating valve 13. The output end of the precooler 12 is connected to the input end of the liquid storage tank 11.

[0046] During the energy storage process, the first control valve 21 is opened, the connection between the air compressor 1 and the coupling 5 is disconnected, and the air compressor 1 is provided with electric energy through the distribution network 25 to drive it to work. The high-temperature air inlet of the precooler 12 in the cold storage cooling device is connected to the ambient air, and the low-temperature liquid inlet is the cold storage working medium. The cold storage working medium can cool the air inlet of the air compressor 1 to obtain low-temperature and low-pressure air. The low-temperature and low-pressure air enters the air compressor 1 to perform work and is compressed into high-temperature and high-pressure compressed air, and the compressed air is stored in the air storage chamber 2.

[0047] During the energy release process, the second control valve 20 is opened, releasing compressed air from the air storage chamber 2 into the preheater 3. The compressed air then exchanges heat with the heat-collecting liquid within the preheater 3, forming high-temperature, high-pressure gas that enters the first expander 22 for expansion and work. This expansion work is then output to the generator, generating electricity and supplying power. Furthermore, the exhaust gas from the compressed air after expansion in the first expander 22 is relatively low in temperature and can be used for cooling, providing cooling capacity for the refrigerant in the refrigerant storage and pre-cooling air subsystem.

[0048] During the cooling process, no additional compressor is required. Air compressor 1 is connected to coupling 5 to utilize the energy storage subsystem's air compressor 1. Opening the second control valve 20 releases compressed air from air storage chamber 2, which enters preheater 3. There, it undergoes heat exchange with the heat-collecting liquid within preheater 3, generating high-temperature, high-pressure gas that enters first expander 4 for expansion and work. This expansion work drives air compressor 1 through coupling 5, allowing ambient air to enter air compressor 1, generating medium-temperature, high-pressure compressed air. This high-temperature, high-pressure compressed air then enters second expander 4 for expansion and work. The expanded gas is at a lower temperature and can be used for cooling. Furthermore, the compressed air enters first expander 22 for expansion and work, resulting in a lower exhaust temperature at its outlet, also useful for cooling. Therefore, the final cooling capacity is equal to the sum of the low-temperature exhaust gas cooling capacity of the first expander and the low-temperature exhaust gas cooling capacity of the second expander. This cooling capacity is then stored in the cold storage cooling device and used to cool the air inlet to the air compressor. Some of the cooling capacity in the cold storage cooling device can also be transmitted to users on the distribution network for cooling.

[0049] The distribution network side electric cooling and supply micro compressed air energy storage system coupled with the solar thermal system provided in the embodiment of the present application preheats the compressed air entering the expander through the solar photovoltaic collection subsystem, utilizes solar heat to improve efficiency, increases the intake temperature of the expander and the work capacity of the high-pressure air, and part of the compressed air enters the expander to output expansion work, drives the compressor to work through the coupling, drives the steam compression refrigeration cycle, and at the same time recovers the cold energy in the exhaust gas of the expander and stores it in the cold storage device for cooling the air compressor inlet air, reducing the compressed air temperature, reducing the work done by the compressor, and increasing the effective air storage capacity of the air storage chamber. Part of the cold energy can also be transmitted to the cooling users on the distribution network side; in addition, in the process of energy storage and release, cold energy, heat and electricity can be provided to users, so that the energy utilization of the entire system is maximized.

[0050] In the specification of this application and the above-mentioned drawings, the terms "first," "second," "third," "fourth," etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0051] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or plural.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0053] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0054] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0055] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for executing all or part of the steps of the method described in each embodiment of the present application through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name: Read-Only Memory, English abbreviation: ROM), random access memory (full name: Random Access Memory, English abbreviation: RAM), disk or optical disk, and other media that can store program code.

[0056] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A grid-side electricity-cooling combined power micro-compressed air energy storage system coupled with a solar-thermal system, characterized in that: include: Solar photovoltaic heat collection subsystem, energy storage subsystem, energy release subsystem and cold storage and pre-cooling air subsystem; The solar photovoltaic heat collection subsystem includes a solar heat collector for collecting heat; The energy storage subsystem includes an air compressor connected to the power distribution network and configured to compress input low-temperature and low-pressure air using the electrical energy provided by the power distribution network to obtain compressed air; The energy release subsystem includes a preheater and a first expander. One inlet of the preheater is used to obtain heat from the solar photovoltaic heat collection subsystem, and the other inlet obtains the compressed air. The energy release subsystem is used to perform heat exchange between the compressed air and the heat to form high-temperature and high-pressure gas, expand the high-temperature and high-pressure gas to produce work, and output the expansion work to drive the generator to generate electricity to provide electrical energy. The exhaust gas after the expansion work is transmitted to the cold storage and pre-cooling air subsystem; The cold storage and pre-cooling air subsystem includes a refrigeration device and a cold storage cooling device, which are used to cool the exhaust gas after expansion and transfer the obtained low-temperature exhaust gas as cooling energy to the cooling users on the distribution network side, and when the energy storage subsystem is in operation, cool the input air of the energy storage subsystem to obtain low-temperature and low-pressure air; The refrigeration device includes a second expander, a coupling and a regenerator; The input end of the second expander is connected to the output end of the preheater and the output end of the regenerator respectively, the output end of the second expander is connected to the input end of the air compressor through the coupling, and the input end of the regenerator is connected to the output end of the air compressor.

2. The grid-side electric cooling and power supply micro compressed air energy storage system of the coupled solar thermal system according to claim 1 is characterized in that: The solar photovoltaic heat collection subsystem also includes a hot water tank, a cold water tank and a first liquid pump; The input end of the solar thermal collector is connected to the output end of the first liquid pump, the output end of the solar thermal collector is connected to the input end of the hot water tank, and the output end of the hot water tank is connected to the input end of the preheater; The input end of the first liquid pump is connected to the output end of the cold water tank, and the input end of the cold water tank is connected to the output end of the preheater; A heat collecting liquid flows in the solar thermal collector, and the heat collecting liquid is used to absorb the heat collected by the solar thermal collector and then transfer it to the hot water tank for storage; The preheater is used to perform heat exchange between the compressed air and the heat collecting liquid to form high-temperature and high-pressure gas, and to transfer the exchanged heat collecting liquid to the cold water tank. The low-temperature heat collecting liquid in the cold water tank is pressurized and transferred to the solar collector for heat absorption through the first liquid pump.

3. The grid-side electric cooling and power supply micro compressed air energy storage system of the coupled solar thermal system according to claim 2 is characterized in that: The solar photovoltaic heat collection subsystem further includes a first flow regulating valve, which is arranged between the hot water tank and the preheater.

4. The grid-side electricity-cooling combined supply micro compressed air energy storage system of the coupled solar-thermal system according to claim 1 is characterized in that: The energy storage subsystem further includes: a first control valve and a gas storage chamber; The first control valve is arranged between the input end of the air storage chamber and the output end of the air compressor, and is used to control the input end of the air storage chamber; The air storage chamber is used to store the compressed air.

5. The grid-side electricity-cooling combined supply micro compressed air energy storage system of the coupled solar-thermal system according to claim 4 is characterized in that: The energy release subsystem further includes a second control valve, which is disposed between the output end of the gas storage chamber and the input end of the preheater and is used to control the output end of the gas storage chamber.

6. The grid-side electricity-cooling combined supply micro compressed air energy storage system of the coupled solar-thermal system according to claim 1, characterized in that: The cold storage cooling device includes: a cold storage device, an evaporator, a second flow regulating valve, a precooler, a liquid storage tank and a second liquid pump; The input end of the evaporator is respectively connected to the output end of the first expander, the output end of the second expander and the output end of the liquid storage tank through the second liquid pump. The output end of the evaporator is connected to the input end of the cold accumulator. The output end of the cold accumulator is connected to the input end of the precooler through the second flow regulating valve. The output end of the precooler is connected to the input end of the liquid storage tank.

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