Salt-cavern compressed air energy storage series compressor system and start-stop control method

Abstract

The invention discloses a series compressor system for salt-cavern compressed air energy storage and a start-stop control method, belongs to the technical field of salt-cavern compressed air energy storage, and aims to solve the technical problems that a traditional start mode needs to manually operate a CCS control system, and start failure is easily caused. The system comprises a single-row compressed air system or a plurality of compressed air systems which are connected in parallel; the compressed air system comprises a first-section compressor module, a second-section compressor module, a third-section compressor module, a fourth-section compressor module and a CCS compressor control module which are sequentially connected in series. The series compressor unit can be sequentially started and stopped through one key according to the control logic, safety and reliability are achieved, meanwhile, an anti-surge valve, an electric control valve and a return valve corresponding to the compressor can be automatically adjusted to meet the process change in the starting process, and manual intervention is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of salt cavern compressed air energy storage, and particularly relates to a series compressor system for salt cavern compressed air energy storage and a starting and stopping control method therefor. Background Art

[0002] The compressed air energy storage power station system mainly includes a compression system, an expansion power generation system, and a storage heat exchange system. The main purpose of the compression system is to use the low-valley power of the power grid to drive a compressor to compress air, convert electrical energy into the compression energy of air, and store it in a salt cavern to complete the energy storage process.

[0003] The control system of the entire air compressor unit and its supporting and auxiliary systems is implemented by a compressor unit control system (CCS). In the traditional starting method, an instruction is sent to the frequency converter in the CCS control system, and the frequency converter drives the motor of the first-stage compressor to start the first-stage compressor. After the first-stage compressor starts successfully, the motor of the first-stage compressor runs at power frequency, the frequency converter disconnects and prepares for starting the second-stage compressor. Manually operate the CCS system to control the anti-surge valve and air supply valve of the first-stage compressor, and the anti-surge valve and reflux valve of the second-stage compressor. After the CCS sends an instruction to start the second-stage compressor to the frequency converter, the frequency converter drives the motor of the second-stage compressor to start the second-stage compressor. During this period, it is necessary to manually operate the CCS system to control the anti-surge valve and air supply valve of the first-stage compressor, and the anti-surge valve and reflux valve of the second-stage compressor. After the second-stage compressor starts successfully, start the third-stage compressor and the fourth-stage compressor in sequence. This traditional starting method requires manual operation of the CCS control system, has a long starting time, and due to improper manual operation during the starting process, the failure of the unit to start often occurs. Summary of the Invention

[0004] The purpose of the present invention is to provide a series compressor system for salt cavern compressed air energy storage and a starting and stopping control method therefor, so as to solve the technical problem that the traditional starting method requires manual operation of the CCS control system and is prone to starting failure.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A series compressor system for salt cavern compressed air energy storage provided by the present invention includes a single single-column compressed air system or multiple parallel compressed air systems; The compressed air system includes a first-stage compressor module, a second-stage compressor module, a third-stage compressor module, a fourth-stage compressor module, and a CCS compressor control module connected in series in sequence; air is input from the first-stage compressor module and output from the fourth-stage compressor module to a salt cavern. The CCS compressor control module includes an APS one-key start-stop control module. The APS one-key start-stop module includes a frequency converter, which is communicatively connected to the first-stage compressor module, the second-stage compressor module, the third-stage compressor module, and the fourth-stage compressor module respectively.

[0006] Optionally or preferably, the first-stage compressor module includes a first-stage compressor, a first motor, and a first-stage heat exchanger, a first-stage cooler, a first-stage gas-liquid separator, a first-stage check valve, a first-stage electric control valve, a first-stage flowmeter, and a first-stage anti-surge valve connected in sequence; The second-stage compressor module includes a second-stage compressor, a second motor, and a second-stage heat exchanger, a second-stage cooler, a second-stage gas-liquid separator, a second-stage check valve, a second-stage electric control valve, a second-stage flowmeter, and a second-stage anti-surge valve connected in sequence; The third-stage compressor module includes a third-stage compressor, a third motor, and a third-stage heat exchanger, a third-stage cooler, a third-stage gas-liquid separator, a third-stage check valve, a third-stage electric control valve, a third-stage flowmeter, and a third-stage anti-surge valve connected in sequence; The fourth-stage compressor module includes a fourth-stage compressor, a fourth motor, and a fourth-stage heat exchanger, a fourth-stage gas-liquid separator, a fourth-stage check valve, a fourth-stage electric control valve, a fourth-stage flowmeter, and a fourth-stage anti-surge valve connected in sequence.

[0007] Optionally or preferably, the second-stage compressor module further includes a second-stage reflux pipeline, and a second-stage reflux valve is arranged on the reflux pipeline; The third-stage compressor module further includes a third-stage reflux pipeline, and a third-stage reflux valve is arranged on the third-stage reflux pipeline; The fourth-stage compressor module further includes a fourth-stage reflux pipeline, and a fourth-stage reflux valve is arranged on the fourth-stage reflux pipeline.

[0008] Optionally or preferably, the first-stage anti-surge valve, the second-stage anti-surge valve, the third-stage anti-surge valve, and the fourth-stage anti-surge valve are all connected with an exhaust silencer.

[0009] A method for controlling the start and stop of a compressor system includes a start method and a stop method; The start method includes the following steps: S1a. Start the first-stage compressor module, open the first-stage anti-surge valve, and close the first-stage electric control valve. At this time, the APS one-key start-stop control module sends a start command to the frequency converter, and the frequency converter controls the first-stage compressor to enter the speed-up process. After the first-stage compressor completes the speed-up, it switches to power-frequency operation, and the load of the first-stage compressor is adjusted by automatically controlling the first-stage anti-surge valve; After completing the load adjustment of the first-stage compressor, automatically open the second-stage reflux valve and the first-stage electric control valve, and reduce the opening degree of the first-stage anti-surge valve; S2a. Start the second-stage compressor module, open the second-stage anti-surge valve, and close the second-stage electric control valve. At this time, the APS one-key start-stop control module sends a start command to the frequency converter, and the frequency converter controls the second-stage compressor to enter the speed-up process. After the second-stage compressor completes the speed-up, it switches to power-frequency operation. The load of the second-stage compressor is adjusted by automatically controlling the second-stage anti-surge valve; After completing the load adjustment of the second-stage compressor, close the second-stage return valve, automatically open the third-stage return valve and the second-stage electric control valve, and reduce the opening of the second-stage anti-surge valve; S3a. Start the third-stage compressor module, open the third-stage anti-surge valve, and close the third-stage electric control valve. At this time, the APS one-key start-stop control module sends a start command to the frequency converter, and the frequency converter controls the third-stage compressor to enter the speed-up process. After the third-stage compressor completes the speed-up, it switches to power-frequency operation. The load of the third-stage compressor is adjusted by automatically controlling the third-stage anti-surge valve; After completing the load adjustment of the third-stage compressor, close the third-stage return valve, automatically open the fourth-stage return valve and the third-stage electric control valve, and reduce the opening of the third-stage anti-surge valve; S4a. Start the fourth-stage compressor module, open the fourth-stage anti-surge valve, and close the fourth-stage electric control valve. At this time, the APS one-key start-stop control module sends a start command to the frequency converter, and the frequency converter controls the fourth-stage compressor to speed up to the minimum allowable operating speed. After the fourth-stage compressor completes the speed-up, it enters power-frequency operation; After the fourth-stage compressor completes the speed-up and switches to power-frequency operation, close the fourth-stage return valve. The load of the compressor system is adjusted by automatically controlling the first-stage anti-surge valve, the second-stage anti-surge valve, the third-stage anti-surge valve, and the fourth-stage anti-surge valve until the outlet pressure and flow rate at the end of the compressor system meet the storage requirements of the salt cavern for compressed air; S5a. The start process ends, open the fourth-stage electric control valve, and the compressor system starts to deliver compressed air to the salt cavern.

[0010] Optionally or preferably, the shutdown method includes the following steps: S1b. The salt cavern sends a shutdown command to the compressor system, and the APS one-key start-stop control module sends a shutdown command to the frequency converter to control the compressor system to execute shutdown; S2b. Control the fourth-stage compressor module to shut down, open the fourth-stage anti-surge valve and reduce the speed of the fourth-stage compressor, and close the fourth-stage check valve and the fourth-stage electric control valve; The compressed air in the pipe is emptied through the fourth-stage anti-surge valve and the exhaust silencer, and the fourth-stage compressor shuts down; S3b. Control the third-stage compressor module to shut down, open the third-stage anti-surge valve and reduce the speed of the third-stage compressor, and close the third-stage check valve and the third-stage electric control valve; The compressed air in the pipe is emptied through the third-stage anti-surge valve and the exhaust silencer, and the third-stage compressor shuts down; S4b. Control the two-stage compressor module to stop, open the two-stage anti-surge valve and reduce the speed of the two-stage compressor, close the two-stage check valve and the two-stage electric control valve; The compressed air in the pipe is discharged through the two-stage anti-surge valve and the exhaust silencer, and the two-stage compressor stops; S5b. Control the one-stage compressor module to stop, open the one-stage anti-surge valve and reduce the speed of the one-stage compressor, close the one-stage check valve and the one-stage electric control valve; The compressed air in the pipe is discharged through the one-stage anti-surge valve and the exhaust silencer, and the one-stage compressor stops; S6b. The shutdown process ends, and the compressor system enters the coasting state.

[0011] Optionally or preferably, the total startup process duration does not exceed 14 minutes; the total shutdown process duration does not exceed 12 minutes.

[0012] Based on the above technical solutions, the present invention can at least produce the following technical effects: (1) The series compressor system and start-stop control method for salt cavern compressed air energy storage provided by the present invention can start and stop the series compressor unit sequentially with one key according to the control logic, which is safe and reliable; (2) During the one-key start-stop process, the corresponding anti-surge valves, electric control valves, and reflux valves of the compressor are automatically adjusted to meet the process changes during the startup process without manual intervention; (3) The start-stop control method for the compressor system provided by the present invention has a short startup time and a short shutdown time, wherein the total startup duration does not exceed 14 minutes, and the total shutdown duration does not exceed 12 minutes. Description of the Drawings

[0013] Figure 1 is the process flow chart of the double-row parallel operation configuration of the series compressor system for salt cavern compressed air energy storage of the present invention; Figure 2 is the APS automatic start-stop control block diagram of the series compressor system for salt cavern compressed air energy storage of the present invention; Figure 3 is the series process system diagram of the series compressor system for salt cavern compressed air energy storage of the present invention; Figure 4 is the system diagram of the frequency converter one-drag-four layout of the series compressor system for salt cavern compressed air energy storage of the present invention.

[0014] In the figure: 10. One-stage compressor module; 11. One-stage compressor; 12. First motor; 13. One-stage heat exchanger; 14. One-stage cooler; 15. One-stage gas-liquid separator; 16. One-stage check valve; 17. One-stage electric control valve; 18. One-stage flowmeter; 19. One-stage anti-surge valve; 20. Second-stage compressor module; 21. Second-stage compressor; 22. Second motor; 23. Second-stage heat exchanger; 24. Second-stage cooler; 25. Second-stage gas-liquid separator; 26. Second-stage check valve; 27. Second-stage electric control valve; 28. Second-stage flowmeter; 29. Second-stage return pipeline; 210. Second-stage return valve; 211. Second-stage anti-surge valve; 30. Third-stage compressor module; 31. Third-stage compressor; 32. Third motor; 33. Third-stage heat exchanger; 34. Third-stage cooler; 35. Third-stage gas-liquid separator; 36. Third-stage check valve; 37. Third-stage electric control valve; 38. Third-stage flowmeter; 39. Third-stage return pipeline; 310. Third-stage return valve; 311. Third-stage anti-surge valve; 40. Fourth-stage compressor module; 41. Fourth-stage compressor; 42. Fourth motor; 43. Fourth-stage heat exchanger; 44. Fourth-stage gas-liquid separator; 45. Fourth-stage check valve; 46. Fourth-stage electric control valve; 47. Fourth-stage flowmeter; 48. Return pipeline; 49. Fourth-stage return valve; 410. Fourth-stage anti-surge valve; 50. Frequency converter; 60. Exhaust silencer. Specific embodiments Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Embodiment 1 Please refer to Figures 1 to 4 , a series compressor system for salt cavern compressed air energy storage, comprising two parallel compressed air systems.

[0016] In this embodiment, the above-mentioned compressed air system includes a first-stage compressor module 10, a second-stage compressor module 20, a third-stage compressor module 30, a fourth-stage compressor module 40, and a CCS compressor control module connected in series in sequence; air is input by the first-stage compressor module 10 and output to the salt cavern by the fourth-stage compressor module (40).

[0017] Specifically, the above-mentioned first-stage compressor module 10 includes a first-stage compressor 11, a first motor 12, and a first-stage heat exchanger 13, a first-stage cooler 14, a first-stage gas-liquid separator 15, a first-stage check valve 16, a first-stage electric control valve 17, a first-stage flowmeter 18, and a first-stage anti-surge valve 19 connected in sequence; the second-stage compressor module 20 includes a second-stage compressor 21, a second motor 22, and a second-stage heat exchanger 23, a second-stage cooler 24, a second-stage gas-liquid separator 25, a second-stage check valve 26, a second-stage electric control valve 27, a second-stage flowmeter 28, and a second-stage anti-surge valve 211 connected in sequence; the third-stage compressor module 30 includes a third-stage compressor 31, a third motor 32, and a third-stage heat exchanger 33, a third-stage cooler 34, a third-stage gas-liquid separator 35, a third-stage check valve 36, a third-stage electric control valve 37, a third-stage flowmeter 38, and a third-stage anti-surge valve 311 connected in sequence; the fourth-stage compressor module 40 includes a fourth-stage compressor 41, a fourth motor 42, and a fourth-stage heat exchanger 43, a fourth-stage gas-liquid separator 44, a fourth-stage check valve 45, a fourth-stage electric control valve 46, a fourth-stage flowmeter 47, and a fourth-stage anti-surge valve 410 connected in sequence.

[0018] In this embodiment, the above-mentioned second-stage compressor module 20 further includes a second-stage return pipeline 29, and a second-stage return valve 210 is arranged on the return pipeline 29; the third-stage compressor module 30 further includes a third-stage return pipeline 39, and a third-stage return valve 310 is arranged on the third-stage return pipeline 39; the fourth-stage compressor module 40 further includes a fourth-stage return pipeline 48, and a fourth-stage return valve 49 is arranged on the fourth-stage return pipeline 48.

[0019] In this embodiment, the above-mentioned first-stage anti-surge valve 19, second-stage anti-surge valve 211, third-stage anti-surge valve 311, and fourth-stage anti-surge valve 410 are all connected with an exhaust silencer 60.

[0020] Embodiment 2 On the basis of Embodiment 1, this embodiment provides a start-stop control method for a compressor system, including a start method and a stop method.

[0021] The start method includes the following steps: S1a. Start the first-stage compressor module 10, open the first-stage anti-surge valve 19, and close the first-stage electric control valve 17. At this time, the APS one-key start-stop control module sends a start command to the frequency converter 50, and the frequency converter 50 controls the first-stage compressor 11 to enter the speed-up process. After the first-stage compressor 11 completes the speed-up, it switches to industrial frequency operation. By automatically controlling the first-stage anti-surge valve 19, the load of the first-stage compressor 11 is adjusted, and the adjustment duration does not exceed 1 minute; After completing the load adjustment of the first-stage compressor 11, automatically open the second-stage return valve 210 and the first-stage electric control valve 17, and reduce the opening degree of the first-stage anti-surge valve 19; S2a. Start the second-stage compressor module 20, open the second-stage anti-surge valve 211, and close the second-stage electric control valve 27. At this time, the APS one-key start-stop control module sends a start command to the frequency converter 50, and the frequency converter 50 controls the second-stage compressor 21 to enter the speed-up process. After the second-stage compressor 21 completes the speed-up, it switches to industrial frequency operation. By automatically controlling the second-stage anti-surge valve 211, the load of the second-stage compressor 21 is adjusted, and the adjustment duration does not exceed 1 minute; After completing the load adjustment of the second-stage compressor 21, close the second-stage reflux valve 210, automatically open the third-stage reflux valve 310 and the second-stage electric control valve 27, and reduce the opening of the second-stage anti-surge valve 211; S3a. Start the third-stage compressor module 30, open the third-stage anti-surge valve 311, and close the third-stage electric control valve 37. At this time, the APS one-key start-stop control module sends a start command to the frequency converter 50, and the frequency converter 50 controls the third-stage compressor 31 to enter the speed-up process. After the third-stage compressor 31 completes the speed-up, it switches to industrial frequency operation. By automatically controlling the third-stage anti-surge valve 311, the load of the third-stage compressor 31 is adjusted, and the adjustment duration does not exceed 1 minute; After completing the load adjustment of the third-stage compressor 31, close the third-stage reflux valve 310, automatically open the fourth-stage reflux valve 49 and the third-stage electric control valve 37, and reduce the opening of the third-stage anti-surge valve 311; S4a. Start the fourth-stage compressor module 40, open the fourth-stage anti-surge valve 410, and close the fourth-stage electric control valve 46. At this time, the APS one-key start-stop control module sends a start command to the frequency converter 50, and the frequency converter 50 controls the fourth-stage compressor 41 to speed up to the minimum allowable operating speed. After the fourth-stage compressor 41 completes the speed-up, it enters industrial frequency operation; After the fourth-stage compressor 41 completes the speed-up and switches to industrial frequency operation, close the fourth-stage reflux valve 49. The load of the compressor system is adjusted by automatically controlling the first-stage anti-surge valve 19, the second-stage anti-surge valve 211, the third-stage anti-surge valve 311, and the fourth-stage anti-surge valve 410 until the outlet pressure and flow rate at the end of the compressor system meet the storage requirements of the salt cavern for compressed air; S5a. The start process ends, open the fourth-stage electric control valve 46, and the compressor system starts to deliver compressed air to the salt cavern. The total start duration does not exceed 14 minutes.

[0022] The above shutdown method includes the following steps: S1b. The salt cavern sends a shutdown command to the compressor system, and the APS one-key start-stop control module sends a shutdown command to the frequency converter (50) to control the compressor system to execute shutdown; S2b. Control the fourth-stage compressor module 40 to shut down, open the fourth-stage anti-surge valve 410 and reduce the speed of the fourth-stage compressor 41, and close the fourth-stage check valve 45 and the fourth-stage electric control valve 46; The compressed air in the pipe is discharged through the four-stage anti-surge valve 410 and the exhaust silencer 60. The four-stage compressor 41 shuts down, and the adjustment duration does not exceed 3 minutes. S3b. Control the three-stage compressor module 30 to shut down, open the three-stage anti-surge valve 311 and reduce the speed of the three-stage compressor 31, and close the three-stage check valve 36 and the three-stage electric regulating valve 37. The compressed air in the pipe is discharged through the three-stage anti-surge valve 311 and the exhaust silencer 60. The three-stage compressor 31 shuts down, and the adjustment duration does not exceed 3 minutes. S4b. Control the two-stage compressor module 20 to shut down, open the two-stage anti-surge valve 211 and reduce the speed of the two-stage compressor 21, and close the two-stage check valve 26 and the two-stage electric regulating valve 27. The compressed air in the pipe is discharged through the two-stage anti-surge valve 211 and the exhaust silencer 60. The two-stage compressor 21 shuts down, and the adjustment duration does not exceed 3 minutes. S5b. Control the one-stage compressor module 10 to shut down, open the one-stage anti-surge valve 19 and reduce the speed of the one-stage compressor 11, and close the one-stage check valve 16 and the one-stage electric regulating valve 17. The compressed air in the pipe is discharged through the one-stage anti-surge valve 19 and the exhaust silencer 60. The one-stage compressor 11 shuts down, and the adjustment duration does not exceed 3 minutes. S6b. The shutdown process ends, and the compressor system enters the coasting state. The total shutdown duration does not exceed 12 minutes.

[0023] Embodiment III Based on Embodiment I and Embodiment II, this embodiment provides a method for starting the frequency converter 50.

[0024] In this embodiment, the one-stage compressor 11, the two-stage compressor 21, and the three-stage compressor 31 perform soft start, and the four-stage compressor 41 starts with frequency conversion and operates with frequency conversion. During the frequency conversion operation process, it can be switched to power frequency operation; according to the process requirements, the sequential start of the above four units is completed within 14 minutes with one key.

[0025] The specific method for starting the frequency converter 50 includes the following steps: S1c. The frequency converter 50 receives the start signal from the APS system, detects that the circuit breakers QF1 - QF9 are all in the working position and have been energized, and are in the open state. If the conditions are not met, an alarm signal is issued, and a signal indicating that the starting conditions are not met is sent to the APS. S2c. The frequency converter 50 issues an instruction to close QF1 and starts the high-voltage pre-charging. S3c. After the pre-charging is successful, the pre-charge circuit breaker (inside the frequency converter 50) closes, the frequency converter 50 is powered on at high voltage, and the frequency converter 50 is self-tested and ready. S4c. After receiving the APS instruction to start the first motor 12, the frequency converter 50 issues an instruction to close QF6. The frequency converter drives the first motor 12 to the rated speed (frequency of 50 Hz). After the first motor 12 reaches 50 Hz, the amplitude and phase of the output voltage of the frequency converter 50 are adjusted so that the frequency, amplitude, and phase of the output voltage of the frequency converter 50 are the same as those of the 1# grid bus voltage. The error between the two is within the threshold range and is maintained for a period of time. Then, QF2 is closed. Subsequently, the frequency converter 50 stops output, QF6 is opened, and the first motor 12 operates at the industrial frequency; S5c. After receiving the APS instruction to start the second motor 22, the frequency converter 50 issues an instruction to close QF7. The frequency converter 50 drives the second motor 22 to the rated speed (frequency of 50 Hz). After the second motor 22 reaches 50 Hz, the amplitude and phase of the output voltage of the frequency converter 50 are adjusted so that the frequency, amplitude, and phase of the output voltage of the frequency converter 50 are the same as those of the grid bus voltage. The error between the two is within the threshold range and is maintained for a period of time. Then, QF3 is closed. Subsequently, the frequency converter 50 stops output, QF7 is opened, and the second motor 22 operates at the industrial frequency; S6c. After receiving the APS instruction to start the third motor 32, the frequency converter 50 issues an instruction to close QF8. The frequency converter drives the third motor 32 to the rated speed (frequency of 50 Hz). After the third motor 32 reaches 50 Hz, the amplitude and phase of the output voltage of the frequency converter 50 are adjusted so that the frequency, amplitude, and phase of the output voltage of the frequency converter 50 are the same as those of the 3# grid bus voltage. The error between the two is within the threshold range and is maintained for a period of time. Then, QF4 is closed. Subsequently, the frequency converter 50 stops output, QF8 is opened, and the third motor 32 operates at the industrial frequency; S7c. After receiving the APS instruction to start the fourth motor 42, the frequency converter 50 issues an instruction to close QF9. The fourth motor 42 is driven by the frequency converter 50 and is matched with the 4 mA - 20 mA of the speed signal and analog input (which can be set by the frequency converter), and operates at a variable frequency according to the process requirements. The fourth motor 42 operates at a variable frequency.

[0026] S8c. The entire startup process ends.

[0027] When the four-stage compressor 41 operates at a variable frequency, when the APS issues an instruction to the frequency converter 50 requiring the four-stage compressor 41 to operate at the industrial frequency, the frequency converter drags the fourth motor 42 to the rated speed (frequency of 50 Hz). After the fourth motor 42 reaches 50 Hz, the amplitude and phase of the output voltage of the frequency converter 50 are adjusted so that the frequency, amplitude, and phase of the output voltage of the frequency converter 50 are the same as those of the 4# grid bus voltage. The error between the two is within the threshold range and is maintained for a period of time. Then, QF5 is closed. Subsequently, the frequency converter 50 stops output, QF9 is opened, and the fourth motor 42 operates at the industrial frequency.

[0028] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A series compressor system for a salt cavern compressed air energy storage, characterized in that, It includes a single single-column compressed air system or multiple parallel compressed air systems; The compressed air system includes a first-stage compressor module (10), a second-stage compressor module (20), a third-stage compressor module (30), a fourth-stage compressor module (40) and a CCS compressor control module connected in series in sequence; air is input by the first-stage compressor module (10) and output to the salt cavern by the fourth-stage compressor module (40); The CCS compressor control module includes an APS one-key start-stop control module, and the APS one-key start-stop module includes an inverter (50), and the inverter (50) is communicatively connected to the first-stage compressor module (10), the second-stage compressor module (20), the third-stage compressor module (30), and the fourth-stage compressor module (40) respectively.

2. The series compressor system for salt cavern compressed air energy storage according to claim 1, characterized in that, The first-stage compressor module (10) includes a first-stage compressor (11), a first motor (12), and a first-stage heat exchanger (13), a first-stage cooler (14), a first-stage gas-liquid separator (15), a first-stage check valve (16), a first-stage electric control valve (17), a first-stage flowmeter (18), and a first-stage anti-surge valve (19) connected in sequence; The second-stage compressor module (20) includes a second-stage compressor (21), a second motor (22), and a second-stage heat exchanger (23), a second-stage cooler (24), a second-stage gas-liquid separator (25), a second-stage check valve (26), a second-stage electric control valve (27), a second-stage flowmeter (28), and a second-stage anti-surge valve (211) connected in sequence; The third-stage compressor module (30) includes a third-stage compressor (31), a third motor (32), and a third-stage heat exchanger (33), a third-stage cooler (34), a third-stage gas-liquid separator (35), a third-stage check valve (36), a third-stage electric control valve (37), a third-stage flowmeter (38), and a third-stage anti-surge valve (311) connected in sequence; The fourth-stage compressor module (40) includes a fourth-stage compressor (41), a fourth motor (42), and a fourth-stage heat exchanger (43), a fourth-stage gas-liquid separator (44), a fourth-stage check valve (45), a fourth-stage electric control valve (46), a fourth-stage flowmeter (47), and a fourth-stage anti-surge valve (410).

3. The series compressor system for salt cavern compressed air energy storage according to claim 2, wherein The second-stage compressor module (20) further includes a second-stage return pipeline (29), and a second-stage return valve (210) is arranged on the return pipeline (29); The third-stage compressor module (30) further includes a third-stage return pipeline (39), and a third-stage return valve (310) is arranged on the third-stage return pipeline (39); The fourth-stage compressor module (40) further includes a fourth-stage return pipeline (48), and a fourth-stage return valve (49) is arranged on the fourth-stage return pipeline (48).

4. The series compressor system for salt cavern compressed air energy storage according to claim 2, characterized in that, The first-stage anti-surge valve (19), the second-stage anti-surge valve (211), the third-stage anti-surge valve (311), and the fourth-stage anti-surge valve (410) are all connected to an exhaust silencer (60).

5. A start-stop control method for a compressor system, characterized in that, The start-stop control method of the compressor system according to any one of claims 1-4 includes a start method and a stop method; The start method includes the following steps: S1a. Start a first-stage compressor module (10), open the first-stage anti-surge valve (19), and close the first-stage electric control valve (17). At this time, the APS one-key start-stop control module sends a start command to the frequency converter (50). The frequency converter (50) controls the first-stage compressor (11) to enter the speed-up process. After the first-stage compressor (11) completes the speed-up, it switches to power-frequency operation. By automatically controlling the first-stage anti-surge valve (19), the load adjustment of the first-stage compressor (11) is carried out; After completing the load adjustment of the first-stage compressor (11), automatically open the second-stage reflux valve (210) and the first-stage electric control valve (17), and reduce the opening of the first-stage anti-surge valve (19); S2a. Start a second-stage compressor module (20), open the second-stage anti-surge valve (211), and close the second-stage electric control valve (27). At this time, the APS one-key start-stop control module sends a start command to the frequency converter (50). The frequency converter (50) controls the second-stage compressor (21) to enter the speed-up process. After the second-stage compressor (21) completes the speed-up, it switches to power-frequency operation. By automatically controlling the second-stage anti-surge valve (211), the load adjustment of the second-stage compressor (21) is carried out; After completing the load adjustment of the second-stage compressor (21), close the second-stage reflux valve (210), automatically open the third-stage reflux valve (310) and the second-stage electric control valve (27), and reduce the opening of the second-stage anti-surge valve (211); S3a. Start a third-stage compressor module (30), open the third-stage anti-surge valve (311), and close the third-stage electric control valve (37). At this time, the APS one-key start-stop control module sends a start command to the frequency converter (50). The frequency converter (50) controls the third-stage compressor (31) to enter the speed-up process. After the third-stage compressor (31) completes the speed-up, it switches to power-frequency operation. By automatically controlling the third-stage anti-surge valve (311), the load adjustment of the third-stage compressor (31) is carried out; After completing the load adjustment of the third-stage compressor (31), close the third-stage reflux valve (310), automatically open the fourth-stage reflux valve (49) and the third-stage electric control valve (37), and reduce the opening of the third-stage anti-surge valve (311); S4a. Start a fourth-stage compressor module (40), open the fourth-stage anti-surge valve (410), and close the fourth-stage electric control valve (46). At this time, the APS one-key start-stop control module sends a start command to the frequency converter (50). The frequency converter (50) controls the fourth-stage compressor (41) to speed up to the minimum allowable operating speed. After the fourth-stage compressor (41) completes the speed-up, it enters power-frequency operation; After the fourth-stage compressor (41) completes the speed-up and switches to power-frequency operation, close the fourth-stage reflux valve (49). By automatically controlling the first-stage anti-surge valve (19), the second-stage anti-surge valve (211), the third-stage anti-surge valve (311), and the fourth-stage anti-surge valve (410), the load adjustment of the compressor system is carried out until the outlet pressure and flow rate at the end of the compressor system meet the storage requirements of the salt cavern for compressed air; S5a. The start process ends. Open the fourth-stage electric control valve (46), and the compressor system starts to deliver compressed air to the salt cavern.

6. The compressor system start-stop control method according to claim 5, wherein The shutdown method includes the following steps: S1b. The salt cavern sends a shutdown instruction to the compressor system, and the APS one-key start-stop control module sends a shutdown instruction to the frequency converter (50) to control the compressor system to execute shutdown. S2b. Control the shutdown of the four-stage compressor module (40), open the four-stage anti-surge valve (410) and reduce the speed of the four-stage compressor (41), close the four-stage check valve (45) and the four-stage electric control valve (46). The compressed air in the pipe is discharged through the four-stage anti-surge valve (410) and the exhaust silencer (60), and the four-stage compressor (41) shuts down. S3b. Control the shutdown of the three-stage compressor module (30), open the three-stage anti-surge valve (311) and reduce the speed of the three-stage compressor (31), close the three-stage check valve (36) and the three-stage electric control valve (37). The compressed air in the pipe is discharged through the three-stage anti-surge valve (311) and the exhaust silencer (60), and the three-stage compressor (31) shuts down. S4b. Control the shutdown of the two-stage compressor module (20), open the two-stage anti-surge valve (211) and reduce the speed of the two-stage compressor (21), close the two-stage check valve (26) and the two-stage electric control valve (27). The compressed air in the pipe is discharged through the two-stage anti-surge valve (211) and the exhaust silencer (60), and the two-stage compressor (21) shuts down. S5b. Control the shutdown of the one-stage compressor module (10), open the one-stage anti-surge valve (19) and reduce the speed of the one-stage compressor (11), close the one-stage check valve (16) and the one-stage electric control valve (17). The compressed air in the pipe is discharged through the one-stage anti-surge valve (19) and the exhaust silencer (60), and the one-stage compressor (11) shuts down. S6b. The shutdown process ends, and the compressor system enters the coasting state.

7. The compressor system start-stop control method according to claim 5, characterized in that, The total duration of the startup process does not exceed 14 minutes; the total duration of the shutdown process does not exceed 12 minutes.

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