Compressed air energy storage and electrochemical energy storage combined system and operation method thereof

Abstract

The invention relates to the technical field of compressed air energy storage, in particular to a compressed air energy storage and electrochemical energy storage combined system and an operation method thereof, and the system comprises a compressed air energy storage system and an electrochemical energy storage system; the compressed air energy storage system comprises a gas storage, an expansion machine, a generator, a medium-voltage power distribution module, a boosting transformer and an alternating-current power grid which are connected in sequence; the electrochemical energy storage system comprises a battery pack, a BMS discharge control module, a direct current filtering module, a PCS inversion module, an output filtering module and a low-voltage dry-type transformer which are connected in sequence. The output end of the low-voltage dry-type transformer is connected with a medium-voltage power distribution module. And a power measurement and control module is arranged between the output end of the generator and the BMS discharge control module. The efficiency of the compressed air energy storage expansion machine is improved, and the manufacturing difficulty of the expansion machine is reduced; the stable output of the power of the compressed air energy storage expansion machine is realized, and the safe, stable and efficient operation of the expansion machine at low air inlet pressure is ensured.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, specifically to a combined compressed air energy storage and electrochemical energy storage system and its operation method. Background Technology

[0002] Compressed air energy storage power generation technology is a high-density, long-life, high-efficiency, and flexible physical energy storage technology that can enhance the peak-shaving capacity of the power grid and improve the reliability of power supply. During power generation, high-pressure air enters an expander to drive a generator, which then generates electricity. The electricity is stepped up by a transformer and connected to the AC power grid.

[0003] However, the compressed air energy storage expander also has the following problems during operation: First, during power generation, the amount of gas in the gas storage gradually decreases, the pressure gradually decreases, and the output of the expander gradually declines. The AC power grid requires the expander to maintain stable output during power generation. Currently, throttling and gas replenishment are commonly used to maintain stable output of the expander, but throttling and gas replenishment will cause energy loss and increase the manufacturing difficulty of the expander. Second, when the pressure in the gas storage drops too much, the overall distributable pressure drop decreases, and the pressure drop distribution between the high-pressure cylinder and the intermediate-pressure cylinder of the expander becomes difficult, which affects the safe and economical operation of the unit.

[0004] Based on the above, the present invention provides a combined compressed air energy storage and electrochemical energy storage system and its operation method to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a combined compressed air energy storage and electrochemical energy storage system and its operation method, so as to solve the technical problems existing in the prior art. The specific technical solution is as follows: A combined compressed air energy storage and electrochemical energy storage system includes a compressed air energy storage system and an electrochemical energy storage system; The compressed air energy storage system includes a gas storage tank, an expander, a generator, a medium-voltage power distribution module, a step-up transformer, and an AC power grid connected in sequence. The electrochemical energy storage system includes a battery pack, a BMS discharge control module, a DC filter module, a PCS inverter module, an output filter module, and a low-voltage dry-type transformer connected in sequence. The output terminal of the low-voltage dry-type transformer is connected to the medium-voltage power distribution module. A power measurement and control module is installed between the output terminal of the generator and the BMS discharge control module.

[0006] Furthermore, the expander includes a high-pressure cylinder and an intermediate-pressure cylinder, and the main shaft of the high-pressure cylinder is connected to the main shaft of the intermediate-pressure cylinder via a coupling.

[0007] Furthermore, the gas storage tank has a first branch and a second branch at its output end. The first branch is connected to the inlet of the high-pressure cylinder, and the outlet of the high-pressure cylinder is connected to the first inlet of the intermediate-pressure cylinder. The second branch is connected to the second inlet of the intermediate-pressure cylinder.

[0008] Furthermore, the high-pressure cylinder is provided with a high-pressure cylinder inlet valve at its inlet, the first inlet of the intermediate-pressure cylinder is provided with an intermediate-pressure cylinder inlet valve one, and the second inlet of the intermediate-pressure cylinder is provided with an intermediate-pressure cylinder inlet valve two.

[0009] Furthermore, the power measurement and control module is used to monitor the power output of the generator in real time and send a power output signal to the BMS discharge control module. The BMS discharge control module then adjusts the output power of the battery pack to maintain the combined output power of the generator and battery pack at the expander's stable output power. .

[0010] An operation method for a combined compressed air energy storage and electrochemical energy storage system as described above includes the following steps: When the gas storage pressure is greater than or equal to the switching pressure between the high-pressure cylinder and the medium-pressure cylinder At this time, the main shaft of the high-pressure cylinder and the main shaft of the intermediate-pressure cylinder are connected together by a coupling. The inlet valve of the high-pressure cylinder and the inlet valve of the intermediate-pressure cylinder are opened, and the inlet valve of the intermediate-pressure cylinder is closed. High-pressure air first enters the high-pressure cylinder and then enters the intermediate-pressure cylinder, and together they work to drive the generator to operate and generate electricity. When the gas storage pressure is less than the switching pressure between the high-pressure cylinder and the medium-pressure cylinder At this time, the main shaft of the high-pressure cylinder and the main shaft of the intermediate-pressure cylinder are disconnected through the coupling, the inlet valve of the high-pressure cylinder and the first inlet valve of the intermediate-pressure cylinder are closed, and the second inlet valve of the intermediate-pressure cylinder is opened. The intermediate-pressure air enters the intermediate-pressure cylinder to do work and drive the generator to run and generate electricity. The power measurement and control module monitors the generator's output power in real time and sends a power output signal to the BMS discharge control module. The BMS discharge control module then adjusts the battery pack's output power to maintain the combined output power of the generator and battery pack at the expander's stable output power (W). p The AC power from the low-voltage dry-type transformer outlet and the AC power from the generator outlet are combined in the medium-voltage distribution module and then output. The AC power is then stepped up to 220KV AC power by the step-up transformer and finally enters the AC power grid.

[0011] Furthermore, the pressure switching between the high-pressure cylinder and the intermediate-pressure cylinder... for: ; in: This is the maximum operating pressure of the gas storage facility; This is the minimum operating pressure for the gas storage facility.

[0012] Furthermore, the generator output power is calculated as follows: At the initial power generation, the generator's output power is The air pressure at the expander inlet is The expander inlet air temperature is The enthalpy of the air at the expander inlet is ,in: To ensure stable output power of the expander, The resistance from the gas storage tank to the expander inlet. This refers to the heat storage temperature. At the end of power generation, the expander inlet air pressure is The expander inlet air temperature is The enthalpy of the air at the expander inlet is... The generator's output power is Calculate using the following formula: ; in: The attenuation coefficient has a value range of 0.8 to 0.9.

[0013] Furthermore, the output power of the electrochemical energy storage system is calculated as follows: The battery pack's output power is 0 at the beginning of power generation and 0 at the end of power generation. - ; Battery pack capacity Determine by the following formula: ; in: This refers to the number of hours the generator operates.

[0014] Furthermore, the volume of the gas storage facility is calculated as follows: The enthalpy of the air at the expander outlet is 0, the amount of air at the expander inlet during initial power generation. for: ; in: For expander efficiency, For generator efficiency; At the end of power generation, the amount of air at the expander inlet... for: ; Total air required during power generation for: 2; Gas storage capacity for: .

[0015] The application of the technical solution of the present invention has the following beneficial effects: (1) This invention provides a combined compressed air energy storage and electrochemical energy storage system, comprising a compressed air energy storage system and an electrochemical energy storage system; the compressed air energy storage system comprises, in sequence, a gas storage tank, an expander, a generator, a medium-voltage power distribution module, a step-up transformer, and an AC power grid; the electrochemical energy storage system comprises, in sequence, a battery pack, a BMS discharge control module, a DC filter module, a PCS inverter module, an output filter module, and a low-voltage dry-type transformer, the output end of which is connected to the medium-voltage power distribution module; a power measurement and control module is provided between the output end of the generator and the BMS discharge control module. This invention compensates for the attenuation of the output of the compressed air energy storage expander by electrochemical energy storage, replacing the currently commonly used method of throttling and gas replenishment to maintain the stable output of the expander, avoiding energy loss caused by throttling and gas replenishment, improving the efficiency of the compressed air energy storage expander, and reducing the manufacturing difficulty of the expander.

[0016] (2) In this invention, the main shaft of the high-pressure cylinder of the expander and the main shaft of the intermediate-pressure cylinder of the expander are connected by a coupling. When the gas storage tank is in a high-pressure state, the main shaft of the high-pressure cylinder of the expander and the main shaft of the intermediate-pressure cylinder of the expander are connected. High-pressure air first enters the high-pressure cylinder of the expander and then enters the intermediate-pressure cylinder of the expander, driving the generator together. When the gas storage tank is in a medium-pressure state, the main shaft of the high-pressure cylinder of the expander and the main shaft of the intermediate-pressure cylinder of the expander are disconnected. Medium-pressure air directly enters the intermediate-pressure cylinder of the expander, driving the generator. When the inlet pressure of the expander is low, the pressure drop of the intermediate-pressure cylinder of the expander is maintained within the normal range to ensure the safe and economical operation of the expander.

[0017] (3) In this invention, when the gas is introduced at medium and low pressure, the medium pressure cylinder of the expander can be separated from the high pressure cylinder and run independently, so that the expander can operate in a larger sliding pressure range, reducing the required gas storage volume and correspondingly reducing the engineering cost.

[0018] (4) The present invention provides an operation method for a combined compressed air energy storage and electrochemical energy storage system. This method achieves stable power output of the compressed air energy storage expander and ensures safe, stable and efficient operation of the expander at low inlet pressure.

[0019] (5) In this invention, the battery capacity of the required battery pack and the volume of the gas storage tank are calculated based on the output power of the generator, which further ensures the stable output of the combined power of the generator and the battery pack and improves the reliability of the power grid supply.

[0020] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the combined compressed air energy storage and electrochemical energy storage system in this invention; Figure 2 It is a graph showing the power output of the generator and battery pack; The components include: 1. Gas storage tank; 2. High-pressure cylinder; 2.1. High-pressure cylinder inlet valve; 3. Coupling; 4. Medium-pressure cylinder; 4.1. Medium-pressure cylinder inlet valve one; 4.2. Medium-pressure cylinder inlet valve two; 5. Generator; 6. Medium-pressure power distribution module; 7. Step-up transformer; 8. AC power grid; 9. Power measurement and control module; 10. Battery pack; 11. BMS discharge control module; 12. DC filter module; 13. PCS inverter module; 14. Output filter module; 15. Low-voltage dry-type transformer; 16. Generator power output curve; 17. Battery pack power output curve; 18. Combined power output curve of generator and battery pack. Detailed Implementation

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] Example See Figure 1 This embodiment provides a combined compressed air energy storage and electrochemical energy storage system, including a compressed air energy storage system and an electrochemical energy storage system; The compressed air energy storage system includes a gas storage tank 1, an expander, a generator 5, a medium-voltage power distribution module 6, a step-up transformer 7, and an AC power grid 8 connected in sequence; the expander includes a high-pressure cylinder 2 and a medium-pressure cylinder 4, and the main shaft of the high-pressure cylinder 2 and the main shaft of the medium-pressure cylinder 4 are connected by a coupling 3.

[0026] Preferably, the output end of the gas storage tank 1 is provided with a first branch and a second branch. The first branch is connected to the inlet of the high-pressure cylinder 2, and the outlet of the high-pressure cylinder 2 is connected to the first inlet of the intermediate-pressure cylinder 4. The second branch is connected to the second inlet of the intermediate-pressure cylinder 4. The inlet of the high-pressure cylinder 2 is provided with a high-pressure cylinder inlet valve 2.1, the first inlet of the intermediate-pressure cylinder 4 is provided with an intermediate-pressure cylinder inlet valve 4.1, and the second inlet of the intermediate-pressure cylinder 4 is provided with an intermediate-pressure cylinder inlet valve 4.2.

[0027] When the gas storage tank 1 is under high pressure, the main shaft of the high-pressure cylinder is connected to the main shaft of the medium-pressure cylinder through the coupling 3. The inlet valve 2.1 of the high-pressure cylinder and the inlet valve 4.1 of the medium-pressure cylinder are open, while the inlet valve 4.2 of the medium-pressure cylinder is closed. The high-pressure air from the outlet of the gas storage tank 1 first enters the high-pressure cylinder and then enters the medium-pressure cylinder, driving the generator to rotate and generate 10KV AC power 1. After passing through the medium-voltage power distribution module 6 and combining with the 10KV AC power 2 from the outlet of the low-voltage dry-type transformer, 10KV AC power 3 is output. After being stepped up by the step-up transformer 7, it becomes 220KV AC power and is connected to the AC power grid.

[0028] When the gas storage tank 1 is in a medium-low pressure state, the main shaft of the high-pressure cylinder is disconnected from the main shaft of the medium-pressure cylinder through a coupling. The inlet valve 2.1 of the high-pressure cylinder and the inlet valve 4.1 of the medium-pressure cylinder are closed, while the inlet valve 4.2 of the medium-pressure cylinder is opened. The medium-pressure air from the outlet of the gas storage tank 1 enters the medium-pressure cylinder, driving the generator to rotate and generate electricity.

[0029] The electrochemical energy storage system includes a battery pack 10, a BMS discharge control module 11, a DC filter module 12, a PCS inverter module 13, an output filter module 14, and a low-voltage dry-type transformer 15 connected in sequence. The output terminal of the low-voltage dry-type transformer 15 is connected to the medium-voltage power distribution module 6. The energy stored in the battery pack is regulated by the BMS discharge control module 11 to generate 380V DC power 1. After passing through the DC filter module 12, the "ripple" and "interference signal" in the DC circuit are suppressed or eliminated, and 380V DC power 2 is output. Then, the PCS inverter module 13 converts it into 380V AC power 1. After the output filter module 14 filters out harmful harmonics, 380V AC power 2 is generated. Finally, the low-voltage dry-type transformer 15 steps it up to 10KV AC power 2 and connects it to the medium-voltage distribution module 6. The 10KV AC power 2 from the outlet of the low-voltage dry-type transformer 15 and the 10KV AC power 1 from the outlet of the generator are combined in the medium-voltage distribution module 6 to output 10KV AC power 3. Then, the step-up transformer steps it up to 220KV AC power and finally enters the AC power grid.

[0030] In this embodiment, a power measurement and control module 9 is provided between the output terminal of the generator 5 and the BMS discharge control module 11. The power measurement and control module 9 is used to monitor the power output of the generator 5 in real time and send a power output signal to the BMS discharge control module 11. The BMS discharge control module 11 then adjusts the output power of the battery pack 10 to maintain the combined output power of the generator 5 and the battery pack 10 at the stable output power of the expander. .

[0031] The power measurement and control module 9 is equipped with an expander to stabilize output power. The output power of generator 5 is obtained in real time through power monitoring signals. Then, a power output signal is sent to the BMS discharge control module 11 to adjust the output power of the battery pack 10 to... .

[0032] In this embodiment, see Figure 2 The generator's output power is in the generation Gradually decreasing from high to low within hours, from Down to (As shown in generator power output curve 16); the battery pack's output power during power generation Gradually increasing from low to high within hours, from 0 to (As shown in battery pack power output curve 17); the combined output power of the generator and battery pack in power generation Maintain stable output for hours, with an output power of (As shown in curve 18, which represents the combined power output of the generator and battery pack).

[0033] This invention uses electrochemical energy storage to compensate for the output attenuation of a compressed air energy storage expander, replacing the currently common method of throttling and replenishing air to maintain stable expander output. This avoids energy loss caused by throttling and replenishing air, improves the efficiency of the compressed air energy storage expander, and reduces the manufacturing difficulty of the expander.

[0034] This embodiment also provides an operation method for a combined compressed air energy storage and electrochemical energy storage system, including the following steps: When the pressure of gas storage tank 1 is greater than or equal to the switching pressure between the high-pressure cylinder and the medium-pressure cylinder At this time, the main shaft of high-pressure cylinder 2 and the main shaft of intermediate-pressure cylinder 4 are connected together by coupling 3. The inlet valve 2.1 of high-pressure cylinder and the inlet valve 4.1 of intermediate-pressure cylinder are open, and the inlet valve 4.2 of intermediate-pressure cylinder is closed. High-pressure air first enters high-pressure cylinder 2 and then enters intermediate-pressure cylinder 4. High-pressure cylinder 2 and intermediate-pressure cylinder 4 work together to drive generator 5 to operate and generate electricity. When the pressure in gas storage tank 1 is less than the switching pressure between the high-pressure cylinder and the intermediate-pressure cylinder At this time, the main shaft of high-pressure cylinder 2 and the main shaft of medium-pressure cylinder 4 are disconnected through coupling 3, the inlet valve 2.1 of high-pressure cylinder and the inlet valve 4.1 of medium-pressure cylinder are closed, and the inlet valve 4.2 of medium-pressure cylinder is opened. Medium-pressure air enters the medium-pressure cylinder 4 to do work and drive the generator 5 to operate and generate electricity. The power measurement and control module 9 monitors the power output of the generator 5 in real time and sends a power output signal to the BMS discharge control module 11. The BMS discharge control module 11 then adjusts the output power of the battery pack 10 to maintain the combined output power of the generator 5 and the battery pack 10 at the expander's stable output power W. p The AC power from the outlet of the low-voltage dry-type transformer 15 and the AC power from the outlet of the generator 5 are combined at the medium-voltage distribution module 6 and then output. The AC power is then stepped up to 220KV AC power by the step-up transformer 7 and finally enters the AC power grid 8.

[0035] Furthermore, the pressure switching between the high-pressure cylinder and the intermediate-pressure cylinder... for: ; in: This is the maximum operating pressure of the gas storage facility; This is the minimum operating pressure for the gas storage facility.

[0036] In this embodiment, the output power of generator 5 is calculated as follows: At the initial power generation, the output power of generator 5 is (This power is also the stable output power that the expander needs to maintain.) The expander inlet air pressure is... The expander inlet air temperature is The enthalpy of the air at the expander inlet is (This value is obtained by referring to the air physical properties table based on pressure and temperature), where: To ensure stable output power of the expander, The resistance from the gas storage tank to the expander inlet. This refers to the heat storage temperature. At the end of power generation, the expander inlet air pressure is The expander inlet air temperature is The enthalpy of the air at the expander inlet is... (This value is obtained from the air physical properties table based on pressure and temperature), the generator's output power is Calculate using the following formula: ; in: The attenuation coefficient has a value range of 0.8 to 0.9.

[0037] Based on the output power of generator 5 at the initial power generation And the generator output power at the end of power generation is The output power of the electrochemical energy storage system is determined as follows: The output power of battery pack 10 is 0 at the beginning of power generation, and the output power of battery pack 10 is 0 at the end of power generation. - ; The battery capacity of battery pack 10 is determined based on the output power of battery pack 10. : ; in: This refers to the number of hours the generator operates.

[0038] Furthermore, the volume of the gas storage tank 1 is calculated as follows: The expander outlet air pressure is assumed to be the local annual average pressure plus 40 kPa, and the air temperature is assumed to be 20℃. The expander outlet air enthalpy is obtained from the air physical properties table based on pressure and temperature. 0, the amount of air at the expander inlet during initial power generation. for: ; in: For expander efficiency, For generator efficiency; At the end of power generation, the amount of air at the expander inlet... for: ; Total air required during power generation for: 2; Volume of gas storage 1 for: .

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A combined compressed air energy storage and electrochemical energy storage system, characterized in that, This includes compressed air energy storage systems and electrochemical energy storage systems; The compressed air energy storage system includes a gas storage tank (1), an expander, a generator (5), a medium-voltage power distribution module (6), a step-up transformer (7), and an AC power grid (8) connected in sequence. The electrochemical energy storage system includes a battery pack (10), a BMS discharge control module (11), a DC filter module (12), a PCS inverter module (13), an output filter module (14), and a low-voltage dry-type transformer (15) connected in sequence. The output end of the low-voltage dry-type transformer (15) is connected to the medium-voltage power distribution module (6). A power measurement and control module (9) is provided between the output terminal of the generator (5) and the BMS discharge control module (11).

2. The combined compressed air energy storage and electrochemical energy storage system according to claim 1, characterized in that, The expander includes a high-pressure cylinder (2) and a medium-pressure cylinder (4), and the main shaft of the high-pressure cylinder (2) and the main shaft of the medium-pressure cylinder (4) are connected by a coupling (3).

3. The combined compressed air energy storage and electrochemical energy storage system according to claim 2, characterized in that, The gas storage tank (1) has a first branch and a second branch at its output end. The first branch is connected to the inlet of the high-pressure cylinder (2), and the outlet of the high-pressure cylinder (2) is connected to the first inlet of the medium-pressure cylinder (4). The second branch is connected to the second inlet of the medium-pressure cylinder (4).

4. The combined compressed air energy storage and electrochemical energy storage system according to claim 3, characterized in that, The high-pressure cylinder (2) is provided with a high-pressure cylinder inlet valve (2.1) at its inlet, the medium-pressure cylinder (4) is provided with a medium-pressure cylinder inlet valve one (4.1) at its first inlet, and the medium-pressure cylinder (4) is provided with a medium-pressure cylinder inlet valve two (4.2) at its second inlet.

5. A combined compressed air energy storage and electrochemical energy storage system according to any one of claims 1-4, characterized in that, The power measurement and control module (9) is used to monitor the power output of the generator (5) in real time and send a power output signal to the BMS discharge control module (11). The BMS discharge control module (11) adjusts the output power of the battery pack (10) so that the combined output power of the generator (5) and the battery pack (10) is maintained at the stable output power of the expander. .

6. A method for operating a combined compressed air energy storage and electrochemical energy storage system as described in claim 5, characterized in that, Includes the following steps: When the pressure of the gas storage tank (1) is greater than or equal to the switching pressure between the high-pressure cylinder and the medium-pressure cylinder At that time, the main shaft of the high-pressure cylinder (2) and the main shaft of the intermediate-pressure cylinder (4) are connected together by a coupling (3). The inlet valve (2.1) of the high-pressure cylinder and the inlet valve one (4.1) of the intermediate-pressure cylinder are opened, and the inlet valve two (4.2) of the intermediate-pressure cylinder is closed. High-pressure air first enters the high-pressure cylinder (2) and then enters the intermediate-pressure cylinder (4), and together they work to drive the generator (5) to operate and generate electricity. When the pressure of the gas storage tank (1) is less than the switching pressure between the high-pressure cylinder and the medium-pressure cylinder At this time, the main shaft of the high-pressure cylinder (2) and the main shaft of the medium-pressure cylinder (4) are disconnected through the coupling (3), the inlet valve (2.1) of the high-pressure cylinder and the first inlet valve (4.1) of the medium-pressure cylinder are closed, the second inlet valve (4.2) of the medium-pressure cylinder is opened, and the medium-pressure air enters the medium-pressure cylinder (4) to do work and drive the generator (5) to run and generate electricity; The power measurement and control module (9) monitors the power output of the generator (5) in real time and sends a power output signal to the BMS discharge control module (11). The BMS discharge control module (11) adjusts the output power of the battery pack (10) so that the combined output power of the generator (5) and the battery pack (10) is maintained at the expander's stable output power W. p The AC power output from the low-voltage dry-type transformer (15) and the AC power output from the generator (5) are combined in the medium-voltage distribution module (6) and then stepped up by the step-up transformer (7) to 220KV AC power, and finally enter the AC power grid (8).

7. The operation method of a combined compressed air energy storage and electrochemical energy storage system according to claim 6, characterized in that, High-pressure cylinder and intermediate-pressure cylinder switching pressure for: ； in: This is the maximum operating pressure of the gas storage facility; This is the minimum operating pressure for the gas storage facility.

8. The operation method of the combined compressed air energy storage and electrochemical energy storage system according to claim 7, characterized in that, The output power of generator (5) is calculated as follows: At the initial power generation, the output power of generator (5) is The air pressure at the expander inlet is The expander inlet air temperature is The enthalpy of the air at the expander inlet is ,in: To ensure stable output power of the expander, The resistance from the gas storage tank to the expander inlet. This refers to the heat storage temperature. At the end of power generation, the expander inlet air pressure is The expander inlet air temperature is The enthalpy of the air at the expander inlet is... The generator's output power is Calculate using the following formula: ； in: The attenuation coefficient has a value range of 0.8 to 0.

9.

9. The operation method of a combined compressed air energy storage and electrochemical energy storage system according to claim 8, characterized in that, The output power of the electrochemical energy storage system is calculated as follows: The output power of the battery pack (10) is 0 at the initial power generation and 0 at the end of power generation. - ; Battery capacity of battery pack (10) Determine using the following formula: ； in: This refers to the number of hours the generator operates.

10. The operation method of a combined compressed air energy storage and electrochemical energy storage system according to claim 9, characterized in that, The volume of the gas storage facility (1) is calculated as follows: The enthalpy of the air at the expander outlet is 0, the amount of air at the expander inlet during initial power generation. for: ； in: For expander efficiency, For generator efficiency; At the end of power generation, the amount of air at the expander inlet... for: ； Total air required during power generation for: 2； Volume of gas storage (1) for: 。

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