A strong network type compressed air energy storage system

Abstract

The present invention discloses a strong grid-building type compressed air energy storage system, which belongs to the field of energy storage technology. The operation modes of the system include a compression energy storage mode, an expansion energy release mode, a voltage support mode and a continuous inertia mode. The system can switch freely among the compression energy storage mode, the expansion energy release mode, the voltage support mode and the continuous inertia mode according to the actual needs of the power grid system. The system can operate uninterruptedly around the clock through the free switching among the modes, and the transformation of the compressed air energy storage system to active and reactive four-quadrant regulation is realized, the voltage support and continuous inertia functions are added, and the strong grid-building function of the compressed air energy storage power station is improved, so as to provide peak-shaving and frequency regulation, reactive power regulation, rotational inertia and other aspects of grid-building support for new power systems with a high proportion of new energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage, and in particular relates to a strong network type compressed air energy storage system. Background Art

[0002] As the installed capacity and electricity proportion of new energy sources such as wind power and photovoltaics in new power systems continues to increase, the access of a high proportion of renewable energy and power electronic equipment has made the power system present a "double high" feature. The access of a high proportion of renewable energy has led to the problem of unbalanced power generation. The inclusion of a high proportion of power electronic equipment has caused the traditional synchronous power grid structure to have problems such as low inertia, low damping and weakened voltage support capacity, which has weakened the power system's ability to respond to disturbances.

[0003] At present, the development of energy storage technology can solve the problem of high-proportion new energy access to a certain extent. Electrochemical energy storage can solve the problem of short-term power imbalance, but it increases the proportion of power electronic equipment by connecting power electronic equipment to the grid. Pumped storage power stations can solve the problem of medium- and long-term power imbalance, but the water pump and turbine share a motor generator. The water pump, turbine, and motor generator run coaxially and cannot provide 24-hour inertia support every day.

[0004] Compressed air energy storage can better solve the "double high" problem of the power system. In terms of power balance, compressed air energy storage uses off-peak electricity or abandoned wind and photovoltaic power to compress air, converting electrical energy into compressed heat energy and pressure potential energy. The compressed heat energy is stored in the heat storage unit, and the pressure potential energy is stored in the gas storage unit; during peak electricity consumption, the air in the gas storage device is released to drive the turbine to work, drive the generator to generate electricity, and convert the pressure potential energy in the heat storage unit into electrical energy.

[0005] Under normal conditions, compressed air energy storage is mainly used for peak load regulation of the power grid, generating electricity for only 6 hours a day, and the generator is idle most of the time. At the same time, frequent starts and stops will also cause certain wear and tear on the turbine generator, reducing the service life of the equipment.

[0006] As the proportion of new energy increases, the proportion of thermal power units will gradually decrease in the future, and the power sources with rotational inertia in the power system will become less and less, and the dynamic stability will continue to be weakened. Compressed air energy storage technology, as a long-term physical energy storage method, realizes energy conversion and storage through mechanical means. At the same time, the turbine power generation system configured with compressed air energy storage has its own rotating parts and has good rotational inertia support capabilities, which is more suitable for rotating standby and reactive power support scenarios.

[0007] To this end, the present invention proposes a strong grid-type compressed air energy storage technology route to support the development of new power systems. Summary of the invention

[0008] In view of the above-mentioned problems, the present invention discloses a strong network type compressed air energy storage system.

[0009] The present invention adopts the following technical solution:

[0010] A strong network type compressed air energy storage system, the system includes a compressor, a heat exchanger, a cooler, a cold water storage tank, a hot water storage tank, an air storage reservoir, a reheater, and an air turbine. The cold water storage tank transports cooling water through a pipeline to act on the heat exchanger and the cooler to cool the compressed air. The hot water storage tank transports hot water through a pipeline to act on the reheater to heat the compressed air. A dual channel is provided between the compressor and the reheater. The dual channel includes a direct channel and an air storage channel. The direct channel controls the compressed air output by the compressor to directly enter the reheater. The air storage channel controls the compressed air output by the compressor to enter the air storage reservoir after cooling, and controls the compressed air in the air storage reservoir to enter the reheater. The operating modes of the system include a compression energy storage mode, an expansion energy release mode, a voltage support mode, and a continuous inertia mode. The system can freely switch between the compression energy storage mode, the expansion energy release mode, the voltage support mode, and the continuous inertia mode according to the actual needs of the power grid system. The system can operate uninterruptedly around the clock by freely switching between the modes.

[0011] Furthermore, in the continuous inertia mode, the air turbine generator set is in a reduced load operation state, and the generator set is kept in a rated speed state through compressed gas in the gas storage reservoir, maintaining a relatively small active output state, which is used for the window time outside the daily full power operation of the generator.

[0012] Furthermore, in the voltage support mode, the compressor is in working or stopped state, the air turbine generator set is in voltage support mode, the compressed air required for air turbine driving comes from the compressor exhaust or air storage, and the high-temperature and high-pressure air is used to drive the generator set. Reactive power is generated through the excitation control system, and the excitation size is controlled to control the reactive power size, which is used to provide all-weather voltage support for the power grid system. The system can switch to the voltage support mode at any time according to the needs of the power grid system.

[0013] Furthermore, the compression energy storage mode is used during periods of low-valley electricity, photovoltaic or wind power resources, and uses low-valley electricity, photovoltaic or wind power to drive the compressor to do work, and the compressor runs at full power; the expansion energy release mode is used when the electricity demand is greater than the supply, the compressor stops, and the compressed air in the gas storage reservoir is used to drive the air turbine generator set to run at full power, mainly to generate active power. The system can freely switch between the compression energy storage mode, expansion energy release mode, voltage support mode and continuous inertia mode according to the actual needs of the power grid system.

[0014] Furthermore, the direct passage is a straight pipe, two ends of the straight pipe are respectively connected to the compressor and the reheater, and a first valve is provided on the straight pipe.

[0015] Furthermore, the air storage channel includes a cooler inlet pipe, a cooler, a cooler outlet pipe, an air storage reservoir, and a reheater inlet pipe. The cooler inlet pipe delivers compressed air into the cooler, the cooler outlet pipe delivers compressed air into the air storage reservoir, the reheater inlet pipe is used to deliver the compressed air in the air storage reservoir into the reheater, a second valve is provided on the cooler outlet pipe, and a third valve is provided on the reheater inlet pipe.

[0016] Furthermore, cooling water acts on the heat exchanger and cooler to obtain heated hot water, which is transported to the hot water storage tank through a pipeline, and hot water acts on the reheater to obtain cooling water, which is transported to the cold water storage tank through a pipeline.

[0017] Furthermore, there are three compressors, namely the first compressor, the second compressor and the third compressor, and there are two heat exchangers, namely the first heat exchanger and the second heat exchanger. The first compressor, the first heat exchanger, the second compressor, the second heat exchanger and the third compressor are connected in sequence through pipelines, and the dual channel is arranged between the third compressor and the reheater.

[0018] Furthermore, in the compression energy storage mode, the second valve is in an open state, the third valve is in a closed state, and the first valve is adjusted to an appropriate size according to system requirements, so that a certain proportion of compressed air enters the reheater through the first valve, and the remaining proportion of compressed air enters the gas storage through the second valve;

[0019] In the expansion energy release mode, the first valve and the second valve are closed, and the third valve is opened. The compressed air in the gas storage enters the reheater through the third valve and is heated to drive the air turbine.

[0020] Furthermore, in the voltage support mode, the compressor is in a working or stopped state. When the compressor is in a working state, the first valve and the second valve are opened, and the third valve is closed. A part of the compressed air generated by the compressor enters the reheater through the first valve. When the compressor is in a closed state, the first valve and the second valve are closed, and the third valve is opened. The compressed air entering the reheater comes from the gas storage reservoir.

[0021] In the continuous inertia mode, the first valve and the second valve are closed, the third valve is opened, and the compressed air in the gas storage enters the reheater through the third valve.

[0022] Beneficial effects:

[0023] (1) The present invention discloses a compressed air energy storage system with a strong grid structure. On the basis of the traditional energy storage power station mainly using active power regulation, it realizes the transformation to active and reactive four-quadrant regulation, that is, it adds voltage support and continuous inertia functions, improves the strong grid structure function of the compressed air energy storage power station, and provides peak load and frequency regulation, reactive power regulation, rotational inertia and other aspects of grid structure support for new power systems with a high proportion of new energy.

[0024] (2) The present invention realizes the throughput function of the compressed air energy storage power station for large-scale electric energy, solves the non-real-time balance contradiction between electricity supply and demand, and realizes the "peak shaving and valley filling" of electricity supply and demand through the air "compression energy storage-expansion energy release" cycle.

[0025] (3) The present invention realizes the transition from the daily intermittent operation mode of the conventional energy storage mode to the daily 24-hour continuous support operation mode for the power grid system, making full use of the window time outside the rated active output of the air turbine generator set, maintaining the 24-hour uninterrupted use of the air turbine generator set, and improving the stable support function of the air turbine generator set to the AC synchronous power grid.

[0026] (4) The present invention realizes the transformation of the compressed air energy storage power station from an intermittent grid-type function to a continuous large rotational inertia strong grid-type function, and proposes a solution for a strong grid-type compressed air energy storage power station.

[0027] (5) The working mode proposed in the present invention enables the air turbine generator set to maintain continuous operation, reduce the start and stop of the set, avoid the torsional vibration caused by frequent start and stop conditions, reduce potential damage to the set, and increase the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of a strong network type compressed air energy storage system of the present invention;

[0030] Figure 2 It is a schematic diagram of the daily cycle of a strong-grid mode of a compressed air energy storage system of the present invention applied to a compressed air energy storage power station.

[0031] Illustration: first compressor -1, second compressor -2, third compressor -3, air turbine -4, electric motor -5, first heat exchanger -6, second heat exchanger -7, cooler -8, reheater -9, hot water storage tank -10, gas storage reservoir -11, cold water storage tank -12, first valve -13, second valve -14, third valve -15, generator -16. DETAILED DESCRIPTION

[0032] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] It should be clear that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 1 As shown, a strong network type compressed air energy storage system, the system includes a compressor, a heat exchanger, a cooler, a cold water storage tank, a hot water storage tank, an air storage reservoir, a reheater, and an air turbine. The cold water storage tank transports cooling water through a pipeline to act on the heat exchanger and the cooler to cool the compressed air. The hot water storage tank transports hot water through a pipeline to act on the reheater to heat the compressed air. A dual channel is provided between the compressor and the reheater. The dual channel includes a direct channel and an air storage channel. The direct channel controls the compressed air output by the compressor to directly enter the reheater. The air storage channel controls the compressed air output by the compressor to enter the air storage reservoir after cooling, and controls the compressed air in the air storage reservoir to enter the reheater. The operating modes of the system include a compression energy storage mode, an expansion energy release mode, a voltage support mode, and a continuous inertia mode. The system can switch freely between the compression energy storage mode, the expansion energy release mode, the voltage support mode, and the continuous inertia mode according to the actual needs of the power grid system. The system can operate uninterruptedly around the clock by freely switching between the modes.

[0036] Furthermore, in the continuous inertia mode, the air turbine generator set is in a reduced load operation state, and the generator set is kept in a rated speed state through compressed gas in the gas storage reservoir, maintaining a relatively small active output state, which is used for the window time outside the daily full power operation of the generator.

[0037] Furthermore, in the voltage support mode, the compressor is in working or stopped state, the air turbine generator set is in voltage support mode, the compressed air required for air turbine driving comes from the compressor exhaust or air storage, and the high-temperature and high-pressure air is used to drive the generator set. Reactive power is generated through the excitation control system, and the excitation size is controlled to control the reactive power size, which is used to provide all-weather voltage support for the power grid system. The system can switch to the voltage support mode at any time according to the needs of the power grid system.

[0038] Furthermore, the compression energy storage mode is used during periods of low-valley electricity, photovoltaic or wind power resources, and uses low-valley electricity, photovoltaic or wind power to drive the compressor to do work, and the compressor runs at full power; the expansion energy release mode is used when the electricity demand is greater than the supply, the compressor stops, and the compressed air in the gas storage reservoir is used to drive the air turbine generator set to run at full power, mainly to generate active power. The system can freely switch between the compression energy storage mode, expansion energy release mode, voltage support mode and continuous inertia mode according to the actual needs of the power grid system.

[0039] Furthermore, the direct passage is a straight pipe, two ends of which are respectively connected to the compressor and the reheater, and a first valve 13 is provided on the straight pipe.

[0040] Furthermore, the air storage channel includes a cooler inlet pipe, a cooler, a cooler outlet pipe, an air storage reservoir, and a reheater inlet pipe. The cooler inlet pipe delivers compressed air into the cooler, the cooler outlet pipe delivers compressed air into the air storage reservoir, the reheater inlet pipe is used to deliver the compressed air in the air storage reservoir into the reheater, a second valve 14 is provided on the cooler outlet pipe, and a third valve 15 is provided on the reheater inlet pipe.

[0041] Furthermore, cooling water acts on the heat exchanger and cooler to obtain heated hot water, which is transported to the hot water storage tank through a pipeline, and hot water acts on the reheater to obtain cooling water, which is transported to the cold water storage tank through a pipeline.

[0042] Furthermore, there are three compressors, namely the first compressor 1, the second compressor 2 and the third compressor 3, and there are two heat exchangers, namely the first heat exchanger 6 and the second heat exchanger 7. The first compressor 1, the first heat exchanger 6, the second compressor 2, the second heat exchanger 7 and the third compressor 3 are connected in sequence through pipelines, and the dual channel is arranged between the third compressor 3 and the reheater 9.

[0043] Furthermore, in the compression energy storage mode, the second valve 14 is in an open state, the third valve 15 is in a closed state, and the first valve 13 is adjusted to a suitable size according to system requirements, so that a certain proportion of compressed air enters the reheater 9 through the first valve 13, and the remaining proportion of compressed air enters the gas storage reservoir 11 through the second valve 14;

[0044] In the expansion energy release mode, the first valve 13 and the second valve 14 are closed, and the third valve 15 is opened. The compressed air in the gas storage 11 enters the reheater 9 through the third valve 15 and is heated to drive the air turbine 4.

[0045] Furthermore, in the voltage support mode, the compressor is in a working or stopped state. When the compressor is in a working state, the first valve 13 and the second valve 14 are opened, and the third valve 15 is closed. A part of the compressed air generated by the compressor enters the reheater 9 through the first valve 13. When the compressor is in a closed state, the first valve 13 and the second valve 14 are closed, and the third valve 15 is opened. The compressed air entering the reheater 9 comes from the gas storage reservoir 11.

[0046] In the continuous inertia mode, the first valve 13 and the second valve 14 are closed, and the third valve 15 is opened, and the compressed air in the gas storage 11 enters the reheater 9 through the third valve 15 .

[0047] Example 2

[0048] like Figure 1 As shown, Figure 1 It is a structural schematic diagram of a strong-grid type compressed air energy storage system of the present invention.

[0049] A strong network type compressed air energy storage system, such as Figure 1 As shown, it includes a first compressor 1, a second compressor 2, a third compressor 3, an air turbine 4, an electric motor 5, a first heat exchanger 6, a second heat exchanger 7, a cooler 8, a reheater 9, a hot water storage tank 10, a cold water storage tank 12, a gas storage reservoir 11, and a generator 16.

[0050] The operation process of the compressed air energy storage system is mainly divided into the energy storage process and the energy release process. In the energy storage process, the first compressor 1, driven by the motor 5, compresses the air to the first heat exchanger 6 for heat exchange, the air side outlet of the first heat exchanger 6 is connected to the second compressor 2, the second compressor outlet is connected to the second heat exchanger 7, the air side outlet of the second heat exchanger 7 is connected to the third compressor, a part of the compressed air at the outlet of the third compressor is connected to the cooler 8 through the cooler intake pipe, and flows into the air storage reservoir 11 through the second valve 14 after heat exchange, and another part of the compressed air at the outlet of the third compressor flows directly into the reheater 9 through the first valve 13. The cold water in the cold water storage tank 12 enters the water side inlet of the first heat exchanger 6, the second heat exchanger 7, and the reheater 8 respectively to exchange heat with the incoming air, and the hot water after heat exchange enters the hot water storage tank 10 respectively.

[0051] In the energy release process, the compressed air in the gas storage 11 flows into the reheater 9 through the third valve 15 and directly flows into the reheater 9 through the first valve 13 to compress the air. The compressed air in the reheater 9 flows into the air turbine 4 to drive the generator 16 to generate power. The hot water in the hot water storage tank 10 enters the water side inlet of the reheater 9 to exchange heat with the compressed air flowing in, and the cold water after heat exchange enters the cold water storage tank 12.

[0052] The present invention also discloses a strong-grid type compressed air energy storage system operation mode, and the strong-grid type operation mode mainly includes four types: compression energy storage mode (mode 1), expansion energy release mode (mode 2), voltage support mode (mode 3), and continuous inertia mode (mode 4).

[0053] Mode 1 is a compression energy storage mode. This is a period of high generation of off-peak electricity, photovoltaic power, wind power and other new energy resources. Off-peak electricity or new energy is used to drive the compressor to work, and the compressor operates at full power. The second valve 14 is in an open state, the third valve 15 is in a closed state, and the first valve 13 can be adjusted to a suitable size according to system needs. At this time, a certain proportion of the outlet compressed air of the third compressor 3 directly enters the reheater 9 for heating through the first valve 13, and the remaining proportion of the outlet compressed air of the third compressor 3 enters the gas storage reservoir 11 through the second valve 14.

[0054] Mode 2 is an expansion energy release mode, in which the power demand is greater than the supply, the compressor is in the energy release process, the compressor stops, and the air turbine generator set runs at full power, mainly generating active power. The first valve 13 and the second valve 14 are closed, and the third valve 15 is opened. The compressed air in the gas storage 11 is heated by the reheater 9 to drive the air turbine 4 to do work, driving the generator 16 to generate electricity, achieving active power output, and realizing active power regulation and frequency support for the system.

[0055] Mode 3 is a voltage support mode, in which the compressor can be in working or stopped state, and the air turbine generator set is in voltage support mode. The compressed air required for air turbine driving comes directly from the compressor exhaust or gas storage reservoir, and the generator set is driven by high-temperature and high-pressure air. Reactive power is emitted through the excitation control system, and the excitation size is controlled to control the reactive power size, so as to achieve 24-hour uninterrupted voltage support for the power grid system. When the compressor is in working state, the first valve 13 and the second valve are opened, and the third valve 15 is closed. The compressed air required for air turbine driving comes from the first valve 13, that is, directly from the compressor. When the compressor is in the closed state, the first valve 13 and the second valve 14 are closed, and the third valve 15 is opened, and the compressed air required for air turbine driving comes from the gas storage reservoir.

[0056] Mode 4 is a continuous inertia mode. During the idle time outside the daily full-power operation of the generator, the continuous inertia mode can be switched to, and the air turbine generator set is in a reduced-load operation state. If the power grid system requires, it can maintain 24 hours of operation. In the continuous inertia mode, the first valve 13 and the second valve 14 are closed, and the third valve 15 is opened. The compressed air in the gas storage reservoir 11 enters the reheater 9 through the third valve 15 and is heated to drive the air turbine generator set to work, so that the air turbine generator set is always in the rated speed state, maintaining a small active power output state, and providing 24 hours of uninterrupted rotational inertia support in real time.

[0057] like Figure 2 As shown, Figure 2 This is a schematic diagram of the daily cycle of a strong grid-type compressed air energy storage system of the present invention applied to a strong grid-type compressed air energy storage power station. The continuous inertia mode appears uninterruptedly 24 hours a day, and the voltage support mode can appear at any time period of the 24 hours a day, which is determined according to the requirements of the power grid system.

[0058] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A strong network type compressed air energy storage system, characterized in that: The system includes a compressor, a heat exchanger, a cooler, a cold water storage tank, a hot water storage tank, an air storage reservoir, a reheater, and an air turbine. The cold water storage tank transports cooling water through a pipeline to act on the heat exchanger and the cooler to cool the compressed air. The hot water storage tank transports hot water through a pipeline to act on the reheater to heat the compressed air. A double channel is provided between the compressor and the reheater. The double channel includes a direct channel and an air storage channel. The direct channel controls the compressed air output by the compressor to directly enter the reheater. The air storage channel controls the compressed air output by the compressor to enter the air storage reservoir after cooling, and controls the compressed air in the air storage reservoir to enter the reheater. The operation modes of the system include compression energy storage mode, expansion energy release mode, voltage support mode and continuous inertia mode. The system can switch freely among the compression energy storage mode, expansion energy release mode, voltage support mode and continuous inertia mode according to the actual needs of the power grid system. The system can be operated uninterruptedly around the clock by freely switching among the modes. In the continuous inertia mode, the air turbine generator set is in a reduced load operation state, and the generator set is kept in a rated speed state by compressing the gas in the gas storage reservoir, maintaining a relatively small active output state, which is used for the idle time outside the daily full power operation of the generator; In the voltage support mode, the compressor is in working or stopped state, and the air turbine generator set is in voltage support mode. The compressed air required for driving the air turbine comes from the compressor exhaust or the air storage reservoir. The high-temperature and high-pressure air is used to drive the generator set, and reactive power is generated through the excitation control system to control the excitation size and thus the reactive power size, which is used to provide all-weather voltage support to the power grid system. The system can switch to the voltage support mode at any time according to the needs of the power grid system.

2. A strong network type compressed air energy storage system according to claim 1, characterized in that: The compression energy storage mode is used during periods of low-valley electricity, photovoltaic or wind power resources. The low-valley electricity, photovoltaic or wind power is used to drive the compressor to do work, and the compressor runs at full power. The expansion energy release mode is used when the electricity demand is greater than the supply. The compressor stops and the compressed air in the gas storage reservoir is used to drive the air turbine generator set to run at full power, mainly to generate active power. The system can freely switch between the compression energy storage mode, expansion energy release mode, voltage support mode and continuous inertia mode according to the actual needs of the power grid system.

3. A strong network type compressed air energy storage system according to claim 1, characterized in that: The direct passage is a straight pipe, both ends of which are connected to the compressor and the reheater respectively, and a first valve is provided on the straight pipe.

4. A strong network type compressed air energy storage system according to claim 3, characterized in that: The air storage channel includes a cooler inlet pipe, a cooler, a cooler outlet pipe, an air storage reservoir, and a reheater inlet pipe. The cooler inlet pipe delivers compressed air into the cooler, the cooler outlet pipe delivers compressed air into the air storage reservoir, the reheater inlet pipe is used to deliver the compressed air in the air storage reservoir into the reheater, a second valve is provided on the cooler outlet pipe, and a third valve is provided on the reheater inlet pipe.

5. A strong network type compressed air energy storage system according to claim 4, characterized in that: After the cooling water acts on the heat exchanger and the cooler, heated hot water is obtained, and the heated hot water is transported to the hot water storage tank through a pipeline. After the hot water acts on the reheater, cooling water is obtained, and the cooling water is transported to the cold water storage tank through a pipeline.

6. A strong network type compressed air energy storage system according to claim 5, characterized in that: There are three compressors, namely the first compressor, the second compressor and the third compressor, and there are two heat exchangers, namely the first heat exchanger and the second heat exchanger. The first compressor, the first heat exchanger, the second compressor, the second heat exchanger and the third compressor are connected in sequence through pipelines, and the dual channel is arranged between the third compressor and the reheater.

7. A strong network type compressed air energy storage system according to claim 6, characterized in that: In the compression energy storage mode, the second valve is in an open state, the third valve is in a closed state, and the first valve is adjusted to an appropriate size according to system requirements, so that a certain proportion of compressed air enters the reheater through the first valve, and the remaining proportion of compressed air enters the gas storage through the second valve; In the expansion energy release mode, the first valve and the second valve are closed, and the third valve is opened. The compressed air in the gas storage enters the reheater through the third valve and is heated to drive the air turbine.

8. A strong network type compressed air energy storage system according to claim 7, characterized in that: In the voltage support mode, the compressor is in working or stopped state. When the compressor is in working state, the first valve and the second valve are opened, and the third valve is closed. A part of the compressed air generated by the compressor enters the reheater through the first valve. When the compressor is in the off state, the first valve and the second valve are closed, and the third valve is opened. The compressed air entering the reheater comes from the gas storage reservoir. In the continuous inertia mode, the first valve and the second valve are closed, the third valve is opened, and the compressed air in the gas storage enters the reheater through the third valve.

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