Method and system for time-sharing use of motors in a compressed air energy storage system

Abstract

The present invention provides a method and system for time-sharing use of motors in a compressed air energy storage system, which belongs to the field of energy storage. The compressed air energy storage system includes an air compression energy storage subsystem for compressed air energy storage, a compressed air expansion power generation subsystem for generating electricity using compressed air, and the air compression energy storage subsystem and the compressed air expansion power generation subsystem share a motor group; the method includes: based on the peak-shaving instruction of the power grid, matching and executing the corresponding peak-shaving scheme, including: when the peak-shaving instruction of the power grid is an energy storage instruction, the peak-shaving scheme is to control the motor group and the air compression energy storage subsystem to execute the compressed air energy storage scheme; when the peak-shaving instruction of the power grid is a power generation instruction, the peak-shaving scheme is to control the motor group and the compressed air expansion power generation subsystem to execute the compressed air power generation scheme. The purpose of reducing the number of system motors, reducing equipment space, and improving the overall economy of the compressed air energy storage system under the premise of the same energy storage scale is achieved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage, and in particular to a method for time-sharing motor use in a compressed air energy storage system, a system for time-sharing motor use in a compressed air energy storage system, a machine-readable storage medium, and an electronic device. Background Art

[0002] In recent years, the new energy sector has grown rapidly, accounting for the majority of new installed capacity, reaching 52.6% by the end of 2023. The rapid and large-scale integration of wind and solar energy in a short period of time has posed challenges to the safe and stable operation of the power system, and the power grid has placed greater demands on the duration and responsiveness of peak and frequency regulation.

[0003] Electricity is a type of energy that is used immediately upon generation. Energy storage technology can compensate for this shortcoming by releasing energy during peak hours and storing it during low load periods. This balance between the power generation and consumption sides is maintained, ensuring the safe and economical operation of the power grid in the future, when clean energy is integrated into the grid on a large scale. Energy storage applications cover all aspects of the power system, including the power generation, grid, and consumption sides. Generation-side energy storage is primarily used for peak load regulation, assisting dynamic operation, system frequency regulation, and integrating renewable energy into the grid. Grid-side energy storage is primarily used for peak load regulation, frequency regulation, alleviating grid congestion, and delaying transmission and distribution capacity expansion and upgrades. User-side energy storage primarily relies on distributed renewable energy to achieve self-generation and self-consumption of electricity, reduce user electricity costs, and improve power supply reliability.

[0004] Compressed air energy storage (CAES) is considered one of the most promising large-scale energy storage technologies, offering advantages such as large capacity, long storage cycles, low investment, and environmental friendliness. During periods of low electricity demand, electricity drives the compressor, converting electrical energy into air pressure energy, temporarily storing the high-pressure air. During peak periods, the air pressure energy is converted into mechanical or electrical energy, driving the turbine expander. With rapid technological advancements, the efficiency of CAES power stations has increased to 75%, slightly lower than that of pumped-storage hydropower stations. The cost per kilowatt-hour (kW-h) is approximately 0.436 yuan, significantly lower than that of lithium iron phosphate energy storage. However, current CAES systems face cost challenges, including the large number of devices, extensive floor space, and extensive piping work. These cost issues are becoming increasingly severe as demand for storage scale and the number of compression and expansion stages increase. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a method and system for time-sharing use of motors in a compressed air energy storage system, so as to at least solve the problems of the compressed air energy storage system mentioned above, such as a large number of devices, a large floor area, and a large amount of pipeline engineering.

[0006] To achieve the above objectives, the present invention provides, in a first aspect, a method for time-sharing motor use in a compressed air energy storage system. The compressed air energy storage system includes an air compression energy storage subsystem and a compressed air expansion power generation subsystem. The air compression energy storage subsystem is used to store compressed air energy, and the compressed air expansion power generation subsystem is used to generate electricity using compressed air. The air compression energy storage subsystem and the compressed air expansion power generation subsystem share a motor group.

[0007] The method includes:

[0008] Based on the grid peak load instructions, the corresponding peak load plan is matched and executed, including:

[0009] When the grid peak load regulation instruction is an energy storage instruction, the peak load regulation scheme is to control the generator group and the air compression energy storage subsystem to perform compressed air energy storage;

[0010] When the grid peak-shaving instruction is a power generation instruction, the peak-shaving solution is to control the motor group and the compressed air expansion power generation subsystem to execute a solution of using compressed air to generate electricity.

[0011] Optionally, the above-mentioned motor group includes a first-level charging and discharging integrated motor and a second-level charging and discharging integrated motor, the first-level charging and discharging integrated motor is respectively connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem, the second-level charging and discharging integrated motor is respectively connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem, the first-level charging and discharging integrated motor and the second-level charging and discharging integrated motor are simultaneously connected to the electric energy station, and the electric energy station is used to supply power to the first-level charging and discharging integrated motor and the second-level charging and discharging integrated motor.

[0012] Optionally, the air compression energy storage subsystem includes a first magnetic clutch, a second magnetic clutch, and a first-stage air compressor, a second-stage air compressor, and an air storage device connected in sequence, wherein the air inlet end of the first-stage air compressor is connected to the first magnetic clutch, the first magnetic clutch is connected to the first-stage charging and discharging integrated motor, the air inlet end of the second-stage air compressor is connected to the second magnetic clutch, and the second magnetic clutch is connected to the second-stage charging and discharging integrated motor;

[0013] The above-mentioned scheme for controlling the motor group and the air compression energy storage subsystem to perform compressed air energy storage includes:

[0014] The first magnetic clutch and the second magnetic clutch are controlled to close, and the rotors of the first-stage charging and discharging integrated motor and the second-stage charging and discharging integrated motor are controlled to rotate to drive the air to pass through the first-stage air compressor and the second-stage air compressor in sequence for air compression, and the air storage device is controlled to store the compressed air.

[0015] Optionally, the matching and executing of a corresponding peak-shaving plan based on a power grid peak-shaving instruction may further include:

[0016] When the grid peak load regulation instruction is a power generation instruction, the peak load regulation scheme also includes an air compression energy storage subsystem control scheme; wherein,

[0017] The control scheme of the air compression energy storage subsystem includes:

[0018] Control the first-stage air compressor to enter standby state;

[0019] Based on the grid load fluctuation data and the pressure status data of the gas storage device, the secondary charging and discharging integrated motor operation plan and the secondary air compressor operation plan are matched and executed to control the operation of the secondary charging and discharging integrated motor and the secondary air compressor respectively.

[0020] Optionally, the above-mentioned matching and execution of the two-stage charging and discharging integrated motor operation plan and the two-stage air compressor operation plan based on the grid load fluctuation data and the pressure state data of the gas storage device includes:

[0021] When it is determined that the value of the to-be-cut peak power reaches a first preset to-be-cut peak power threshold and the pressure state of the gas storage device is in a full-load state, the two-stage charging and discharging integrated motor operation scheme is a scheme for controlling the two-stage charging and discharging integrated motor to enter a standby state, and the two-stage air compressor operation scheme is a scheme for controlling the two-stage air compressor to enter a standby state;

[0022] When it is determined that the value of the to-be-cut peak power is less than the second preset to-be-cut peak power threshold and the pressure state of the gas storage device is not at full load, the two-stage charging and discharging integrated motor operation scheme is a scheme for controlling the rotor of the two-stage charging and discharging integrated motor to rotate, and the two-stage air compressor operation scheme is a scheme for controlling the two-stage air compressor to operate at a preset low load;

[0023] Among them, the value of the peak power to be shaving is determined based on the grid load fluctuation data.

[0024] Optionally, the compressed air expansion and power generation subsystem includes a third magnetic clutch, a fourth magnetic clutch, and a first-stage turbine expander and a second-stage turbine expander connected in sequence, the first-stage turbine expander is connected to the fourth magnetic clutch, the fourth magnetic clutch is connected to the second-stage charging and discharging integrated motor, the second-stage turbine expander is connected to the third magnetic clutch, and the third magnetic clutch is connected to the first-stage charging and discharging integrated motor;

[0025] The above-mentioned control motor group and compressed air expansion power generation subsystem implement the scheme of using compressed air to generate electricity, including:

[0026] The third magnetic clutch and the fourth magnetic clutch are controlled to close, and the compressed air in the air storage device is controlled to enter the first-stage turbine expander and the second-stage turbine expander in sequence for expansion and work, so as to drive the first-stage charging and discharging integrated motor and the second-stage charging and discharging integrated motor to generate electricity.

[0027] Optionally, the compressed air energy storage system further includes a heat collection and utilization subsystem, which includes a first-stage compressor heat exchanger, a second-stage compressor heat exchanger, a first-stage expander heat exchanger, a second-stage expander heat exchanger, a heat storage tank and a cold storage tank. The outlet end of the first-stage compressor heat exchanger and the outlet end of the second-stage compressor heat exchanger are respectively connected to the inlet end of the heat storage tank, the inlet end of the first-stage expander heat exchanger and the inlet end of the second-stage expander heat exchanger are respectively connected to the outlet end of the heat storage tank, the inlet end of the first-stage compressor heat exchanger and the inlet end of the second-stage compressor heat exchanger are respectively connected to the outlet end of the cold storage tank, and the outlet end of the first-stage expander heat exchanger and the outlet end of the second-stage expander heat exchanger are respectively connected to the inlet end of the cold storage tank.

[0028] A second aspect of the present invention provides a system for time-sharing motor use in a compressed air energy storage system, wherein the compressed air energy storage system includes an air compression energy storage subsystem and a compressed air expansion power generation subsystem, wherein the air compression energy storage subsystem is used to store compressed air energy, and the compressed air expansion power generation subsystem is used to generate electricity using compressed air, and the air compression energy storage subsystem and the compressed air expansion power generation subsystem share a motor group;

[0029] The motor time-sharing system for the compressed air energy storage system includes:

[0030] The peak-shaving plan execution module is used to match and execute the corresponding peak-shaving plan based on the grid peak-shaving instructions, including:

[0031] When the grid peak load regulation instruction is an energy storage instruction, the peak load regulation scheme is to control the generator group and the air compression energy storage subsystem to perform compressed air energy storage;

[0032] When the grid peak-shaving instruction is a power generation instruction, the peak-shaving solution is to control the motor group and the compressed air expansion power generation subsystem to execute a solution of using compressed air to generate electricity.

[0033] In a third aspect of the present invention, a machine-readable storage medium is provided, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned method for time-sharing motor use in a compressed air energy storage system.

[0034] In a fourth aspect of the present invention, an electronic device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for time-sharing motor use in a compressed air energy storage system is implemented.

[0035] Through the above technical solution, a method and system for time-sharing motor use in a compressed air energy storage system is provided, which combines the air compression energy storage subsystem and the compressed air expansion power generation subsystem into one motor group. When the received power grid peak-shaving instruction is an energy storage instruction, the motor group is controlled to drive the air compression energy storage subsystem to store compressed air energy. When the received power grid peak-shaving instruction is a power generation instruction, the compressed air is expanded and works through the compressed air expansion power generation subsystem to drive the motor group to generate electricity. This method and system for time-sharing motor use in a compressed air energy storage system is based on compressed air energy storage technology, combining the motor of the air compression energy storage subsystem in the prior art and the generator of the compressed air expansion power generation subsystem in the prior art into one motor group. Therefore, when in the energy storage working state (i.e., the power grid peak-shaving instruction is an energy storage instruction), the motor group is driven to drive the air compression energy storage subsystem to perform compressed air energy storage; when in the energy release state (i.e., the power grid peak-shaving instruction is a power generation instruction), the motor group switches to generator mode, and the compressed air is passed through the compressed air expansion power generation subsystem to perform work, thereby driving the motor group to generate electricity. This method and system for time-sharing motor utilization in a compressed air energy storage system can reduce the number of system motors, minimize equipment space, and improve the overall economic efficiency of the compressed air energy storage system while maintaining the same energy storage capacity. This allows for intelligent control of motor group operating state switching, achieving efficient utilization of motor equipment and significantly reducing energy storage costs.

[0036] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0038] Figure 1 This is a flow chart of a method for time-sharing use of motors in a compressed air energy storage system provided by one embodiment of the present invention;

[0039] Figure 2 It is a structural schematic diagram of a compressed air energy storage system provided by one embodiment of the present invention.

[0040] Description of Reference Numerals

[0041] 1-First-stage air compressor, 2-Second-stage air compressor, 3-First-stage turbine expander, 4-Second-stage turbine expander, 5-First-stage charging and discharging integrated motor, 6-Second-stage charging and discharging integrated motor, 7-Air storage device, 8-First-stage compressor heat exchanger, 9-Second-stage compressor heat exchanger, 10-First-stage expander heat exchanger, 11-Second-stage expander heat exchanger, 12-Heat storage tank, 13-Cold storage tank, 14-First magnetic clutch, 15-Second magnetic clutch, 16-Third magnetic clutch, 17-Fourth magnetic clutch. DETAILED DESCRIPTION

[0042] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0044] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positions of components in the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0045] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0046] Figure 1 This is a flow chart of a method for time-sharing motor use in a compressed air energy storage system provided by one embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a method for time-sharing use of motors in a compressed air energy storage system. The compressed air energy storage system includes an air compression energy storage subsystem and a compressed air expansion power generation subsystem. The air compression energy storage subsystem is used to store compressed air energy, and the compressed air expansion power generation subsystem is used to generate electricity using compressed air. The air compression energy storage subsystem and the compressed air expansion power generation subsystem share a motor group.

[0047] The method includes:

[0048] Based on the grid peak load instructions, the corresponding peak load plan is matched and executed, including:

[0049] When the grid peak load regulation instruction is an energy storage instruction, the peak load regulation scheme is to control the generator group and the air compression energy storage subsystem to perform compressed air energy storage;

[0050] When the grid peak-shaving instruction is a power generation instruction, the peak-shaving solution is to control the motor group and the compressed air expansion power generation subsystem to execute a solution of using compressed air to generate electricity.

[0051] The grid dispatching and control system issues peak-shaving instructions to the compressed air energy storage system based on the regional grid's peak-shaving demand signal (which can be determined manually or through real-time grid status monitoring). The grid dispatching and control system issues energy storage instructions during periods of low load and generation instructions during peak demand periods.

[0052] Specifically, this method combines an air compression energy storage subsystem and a compressed air expansion power generation subsystem into a single motor group. When the grid peak-shaving instruction received is an energy storage instruction, the motor group is controlled to drive the air compression energy storage subsystem to store compressed air energy. When the grid peak-shaving instruction received is a power generation instruction, the compressed air expands and generates work through the compressed air expansion power generation subsystem, driving the motor group to generate power. Based on compressed air energy storage technology, this method combines the motor of the existing air compression energy storage subsystem and the generator of the existing compressed air expansion power generation subsystem into a single motor group. In the energy storage mode (i.e., when the grid peak-shaving instruction is an energy storage instruction), the motor group drives the air compression energy storage subsystem to store compressed air energy. In the energy release mode (i.e., when the grid peak-shaving instruction is a power generation instruction), the motor group switches to generator mode, and compressed air flows through the compressed air expansion power generation subsystem to generate work, driving the motor group to generate power. This method can reduce the number of motors in the system, while maintaining the same energy storage capacity, reducing equipment space and improving the overall economic efficiency of the compressed air energy storage system. This enables intelligent control of the switching of the working states of the motor group, achieves efficient use of motor equipment, and significantly reduces energy storage costs.

[0053] Please refer to Figure 2 , Figure 2 : This is a structural diagram of a compressed air energy storage system provided by one embodiment of the present invention. In some embodiments of this embodiment, the above-mentioned motor group includes a first-level charging and discharging integrated motor 5 and a second-level charging and discharging integrated motor 6. The first-level charging and discharging integrated motor 5 is connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem respectively, and the second-level charging and discharging integrated motor 6 is connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem respectively. The first-level charging and discharging integrated motor 5 and the second-level charging and discharging integrated motor 6 are simultaneously connected to an electric energy station, which is used to supply power to the first-level charging and discharging integrated motor 5 and the second-level charging and discharging integrated motor 6.

[0054] Specifically, the motor (i.e., the motor group) shared by the air compression energy storage subsystem and the compressed air expansion power generation subsystem includes a primary integrated charge-discharge motor 5 and a secondary integrated charge-discharge motor 6. The compressed air energy storage system switches between energy storage mode and energy release mode based on the peak-shaving demand signal of the regional power grid. The motor group's operating mode switches between motor and generator mode as the compressed air energy storage system switches modes. This ensures efficient and safe switching between energy storage and release states for the compressed air energy storage system.

[0055] The power station includes a thermal power plant or a renewable energy station. When the grid peak load regulation instruction is an energy storage instruction, the excess electricity generated by the thermal power plant or renewable energy station can drive the first-stage integrated charge-discharge motor 5 and the second-stage integrated charge-discharge motor 6 to drive the air compression energy storage subsystem to store compressed air energy.

[0056] In some embodiments of this embodiment, the above-mentioned air compression energy storage subsystem includes a first magnetic clutch 14, a second magnetic clutch 15, and a first-level air compressor 1, a second-level air compressor 2 and an air storage device 7 connected in sequence, the air intake end of the first-level air compressor 1 is connected to the first magnetic clutch 14, the first magnetic clutch 14 is connected to the first-level charging and discharging integrated motor 5, the air intake end of the second-level air compressor 2 is connected to the second magnetic clutch 15, and the second magnetic clutch 15 is connected to the second-level charging and discharging integrated motor 6; the content of the above-mentioned control motor group and air compression energy storage subsystem to perform compressed air energy storage includes: controlling the first magnetic clutch 14 and the second magnetic clutch 15 to close, controlling the rotor of the first-level charging and discharging integrated motor 5 and the rotor of the second-level charging and discharging integrated motor 6 to rotate, so as to drive the air to pass through the first-level air compressor 1 and the second-level air compressor 2 in sequence for air compression, and controlling the air storage device 7 to store the compressed air.

[0057] Specifically, when the regional power grid is in a low-load period, the air compression energy storage subsystem receives the energy storage instruction and starts the energy storage mode. In the energy storage mode, the first magnetic clutch 14 is closed, the second magnetic clutch 15 is closed, the first-level charging and discharging integrated motor 5 and the second-level charging and discharging integrated motor 6 are in the motor mode, and the excess electric energy generated by the thermal power plant or the new energy station drives the first-level charging and discharging integrated motor 5 and the second-level charging and discharging integrated motor 6. The rotor of the first-level charging and discharging integrated motor 5 and the rotor of the second-level charging and discharging integrated motor 6 drive the air to pass through the first-level air compressor 1 and the second-level air compressor 2 in turn for compression, and the air pressure increases in turn. The final compressed air is stored in the air storage device 7. Thereby achieving the purpose of using the motor group to drive the air compression energy storage subsystem to compress air energy.

[0058] In some implementations of this embodiment, the above-mentioned matching and execution of the corresponding peak-shaving scheme based on the grid peak-shaving instruction also includes: when the grid peak-shaving instruction is a power generation instruction, the peak-shaving scheme also includes an air compression energy storage subsystem control scheme; wherein the content of the air compression energy storage subsystem control scheme includes: controlling the first-stage air compressor 1 to enter the standby state; based on the grid load fluctuation data and the pressure state data of the air storage device 7, matching and executing the second-stage charging and discharging integrated motor 6 operation scheme and the second-stage air compressor 2 operation scheme, so as to control the second-stage charging and discharging integrated motor 6 and the second-stage air compressor 2 to operate respectively.

[0059] Specifically, when the regional power grid is at peak power consumption (i.e., peak load), the first-stage air compressor 1 is in full standby mode. The second-stage charging and discharging integrated motor 6 and the second-stage air compressor 2 can be adjusted based on the power grid load fluctuation data and the pressure state of the air storage device 7.

[0060] In some implementations of this embodiment, the above-mentioned matching and execution of the secondary charging and discharging integrated motor 6 operation plan and the secondary air compressor 2 operation plan based on the grid load fluctuation data and the pressure state data of the gas storage device 7 include: when it is determined that the value of the peak power to be shaving reaches the first preset peak power threshold to be shaving and the pressure state of the gas storage device 7 is in a full load state, the secondary charging and discharging integrated motor 6 operation plan is a plan for controlling the secondary charging and discharging integrated motor 6 to enter a standby state, and the secondary air compressor 2 operation plan is a plan for controlling the secondary air compressor 2 to enter a standby state; when it is determined that the value of the peak power to be shaving is less than the second preset peak power threshold to be shaving and the pressure state of the gas storage device 7 is not in a full load state, the secondary charging and discharging integrated motor 6 operation plan is a plan for controlling the rotor of the secondary charging and discharging integrated motor 6 to rotate, and the secondary air compressor 2 operation plan is a plan for controlling the secondary air compressor 2 to operate according to a preset low load; wherein, the value of the peak power to be shaving is determined based on the grid load fluctuation data.

[0061] Specifically, if a large amount of peak power is required to be slashed (i.e., the value of the peak power to be slashed reaches the first preset threshold value of the peak power to be slashed) and the pressure of the air storage device 7 is fully loaded, the secondary charging and discharging integrated motor 6 and the secondary air compressor 2 directly enter the standby state; if a small amount of peak power is required to be slashed (i.e., the value of the peak power to be slashed is less than the second preset threshold value of the peak power to be slashed) and the pressure of the air storage device 7 is insufficient, the secondary charging and discharging integrated motor 6 can drive the secondary air compressor 2 to operate at low load.

[0062] In some implementations of this embodiment, the compressed air expansion and power generation subsystem includes a third magnetic clutch 16, a fourth magnetic clutch 17, and a first-stage turbine expander 3 and a second-stage turbine expander 4 connected in sequence, the first-stage turbine expander 3 is connected to the fourth magnetic clutch 17, the fourth magnetic clutch 17 is connected to the second-stage charge-discharge integrated motor 6, the second-stage turbine expander 4 is connected to the third magnetic clutch 16, and the third magnetic clutch 16 is connected to the first-stage charge-discharge integrated motor 5; the above-mentioned control of the motor group and the compressed air expansion and power generation subsystem to execute the scheme of using compressed air to generate electricity includes: controlling the third magnetic clutch 16 and the fourth magnetic clutch 17 to close, controlling the compressed air in the air storage device 7 to enter the first-stage turbine expander 3 and the second-stage turbine expander 4 in sequence for expansion and work, so as to drive the first-stage charge-discharge integrated motor 5 and the second-stage charge-discharge integrated motor 6 to generate electricity.

[0063] Specifically, when the regional power grid is at its peak load, the compressed air expansion power generation subsystem receives the power generation instruction issued by the regional power grid and starts the power generation mode. In the power generation mode, the third magnetic clutch 16 and the fourth magnetic clutch 17 are controlled to be closed, the first-stage charging and discharging integrated motor 5 and the second-stage charging and discharging integrated motor 6 are in the motor mode, and the high-pressure compressed air in the air storage device 7 enters the first-stage turbine expander 3 and the second-stage turbine expander 4 in turn to drive the first-stage charging and discharging integrated motor 5 and the second-stage charging and discharging integrated motor 6 to generate electricity. In this way, the compressed air is driven by the first-stage turbine expander 3 and the second-stage turbine expander 4 to perform work, thereby driving the first-stage charging and discharging integrated motor 5 and the second-stage charging and discharging integrated motor 6 to generate electricity.

[0064] In some implementations of this embodiment, when the regional power grid is in a low-load period, the first-stage turbine expander 3 and the second-stage turbine expander 4 are in standby mode, and the high-pressure gas (i.e., compressed air) in the gas storage device 7 is in a state of only entering but not exiting.

[0065] In some implementations of this embodiment, the compressed air energy storage system further includes a heat collection and utilization subsystem, which includes a first-stage compressor heat exchanger 8, a second-stage compressor heat exchanger 9, a first-stage expander heat exchanger 10, a second-stage expander heat exchanger 11, a heat storage tank 12, and a cold storage tank 13. The outlet end of the first-stage compressor heat exchanger 8 and the outlet end of the second-stage compressor heat exchanger 9 are respectively connected to the inlet end of the heat storage tank 12, the inlet end of the first-stage expander heat exchanger 10 and the inlet end of the second-stage expander heat exchanger 11 are respectively connected to the outlet end of the heat storage tank 12, the inlet end of the first-stage compressor heat exchanger 8 and the inlet end of the second-stage compressor heat exchanger 9 are respectively connected to the outlet end of the cold storage tank 13, and the outlet end of the first-stage expander heat exchanger 10 and the outlet end of the second-stage expander heat exchanger 11 are respectively connected to the inlet end of the cold storage tank 13.

[0066] An embodiment of the present invention further provides a system for time-sharing motor use in a compressed air energy storage system, wherein the compressed air energy storage system includes an air compression energy storage subsystem and a compressed air expansion power generation subsystem, wherein the air compression energy storage subsystem is used to store compressed air energy, and the compressed air expansion power generation subsystem is used to generate electricity using compressed air, and the air compression energy storage subsystem and the compressed air expansion power generation subsystem share a motor group;

[0067] The motor time-sharing system for the compressed air energy storage system includes:

[0068] The peak-shaving plan execution module is used to match and execute the corresponding peak-shaving plan based on the grid peak-shaving instructions, including:

[0069] When the grid peak load regulation instruction is an energy storage instruction, the peak load regulation scheme is to control the generator group and the air compression energy storage subsystem to perform compressed air energy storage;

[0070] When the grid peak-shaving instruction is a power generation instruction, the peak-shaving solution is to control the motor group and the compressed air expansion power generation subsystem to execute a solution of using compressed air to generate electricity.

[0071] Specifically, the motor time-sharing system for the compressed air energy storage system combines the air compression energy storage subsystem and the compressed air expansion power generation subsystem into one motor group. When the received grid peak-shaving instruction is an energy storage instruction, the motor group is controlled to drive the air compression energy storage subsystem to store compressed air energy. When the received grid peak-shaving instruction is a power generation instruction, the compressed air is expanded and performed by the compressed air expansion power generation subsystem to drive the motor group to generate electricity. The motor time-sharing system for the compressed air energy storage system is based on compressed air energy storage technology and combines the motor of the air compression energy storage subsystem in the prior art and the generator of the compressed air expansion power generation subsystem in the prior art into one motor group. Therefore, when in the energy storage working state (i.e., the grid peak-shaving instruction is an energy storage instruction), the motor group is driven to drive the air compression energy storage subsystem to perform compressed air energy storage; when in the energy release state (i.e., the grid peak-shaving instruction is a power generation instruction), the motor group switches to generator mode, and the compressed air is performed by the compressed air expansion power generation subsystem, thereby driving the motor group to generate electricity. This motor time-sharing system for compressed air energy storage systems can reduce the number of system motors, minimize equipment space, and improve the overall economic efficiency of compressed air energy storage systems while maintaining the same energy storage capacity. This intelligently controls the switching of motor groups' operating states, achieving efficient utilization of motor equipment and significantly reducing energy storage costs.

[0072] The above describes in detail the optional implementation methods of the embodiments of the present invention in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the scope of protection of the embodiments of the present invention.

[0073] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0074] Those skilled in the art will understand that all or part of the steps in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a program. The program is stored in a storage medium and includes a number of instructions for causing a single-chip microcomputer, chip, or processor to execute all or part of the steps in the methods described in the various embodiments of the present application. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0075] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A method for time-sharing motor use in a compressed air energy storage system, characterized in that: The compressed air energy storage system includes an air compression energy storage subsystem and a compressed air expansion power generation subsystem, wherein the air compression energy storage subsystem is used to store compressed air energy, and the compressed air expansion power generation subsystem is used to generate electricity using compressed air, and the air compression energy storage subsystem and the compressed air expansion power generation subsystem share a motor group; The method comprises: Based on the grid peak load instructions, the corresponding peak load plan is matched and executed, including: When the grid peak-shaving instruction is an energy storage instruction, the peak-shaving scheme is a scheme for controlling the motor group and the air compression energy storage subsystem to perform compressed air energy storage; When the grid peak-shaving instruction is a power generation instruction, the peak-shaving scheme is to control the motor group and the compressed air expansion power generation subsystem to execute a scheme of using compressed air to generate electricity; Wherein, the motor group includes a first-level charging and discharging integrated motor and a second-level charging and discharging integrated motor, the first-level charging and discharging integrated motor is respectively connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem, the second-level charging and discharging integrated motor is respectively connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem, the first-level charging and discharging integrated motor and the second-level charging and discharging integrated motor are simultaneously connected to the electric energy station, the electric energy station is used to supply power to the first-level charging and discharging integrated motor and the second-level charging and discharging integrated motor, the air compression energy storage subsystem includes a first magnetic clutch, a second magnetic clutch and a first-level air compressor, a second-level air compressor and an air storage device connected in sequence, the air inlet end of the first-level air compressor is connected to the first magnetic clutch, the first magnetic clutch is connected to the first-level charging and discharging integrated motor, the air inlet end of the second-level air compressor is connected to the second magnetic clutch, and the second magnetic clutch is connected to the second-level charging and discharging integrated motor; The matching and executing of a corresponding peak-shaving plan based on the grid peak-shaving instruction also includes: When the grid peak load regulation instruction is a power generation instruction, the peak load regulation scheme also includes an air compression energy storage subsystem control scheme; wherein, The control scheme of the air compression energy storage subsystem includes: Control the first-stage air compressor to enter standby mode; Based on the grid load fluctuation data and the pressure status data of the gas storage device, the secondary charging and discharging integrated motor operation plan and the secondary air compressor operation plan are matched and executed to control the operation of the secondary charging and discharging integrated motor and the secondary air compressor respectively.

2. The method for time-sharing use of motors in a compressed air energy storage system according to claim 1, characterized in that: The scheme for controlling the motor group and the air compression energy storage subsystem to perform compressed air energy storage includes: The first magnetic clutch and the second magnetic clutch are controlled to close, and the rotor of the first-stage charging and discharging integrated motor and the rotor of the second-stage charging and discharging integrated motor are controlled to rotate to drive air to pass through the first-stage air compressor and the second-stage air compressor in sequence for air compression, and the air storage device is controlled to store the compressed air.

3. The method for time-sharing use of motors in a compressed air energy storage system according to claim 1, characterized in that: The matching and execution of the two-stage charging and discharging integrated motor operation plan and the two-stage air compressor operation plan based on the grid load fluctuation data and the pressure state data of the gas storage device includes: When it is determined that the value of the to-be-cut peak electricity reaches a first preset to-be-cut peak electricity threshold and the pressure state of the gas storage device is in a full-load state, the two-stage charging-discharging integrated motor operation scheme is a scheme for controlling the two-stage charging-discharging integrated motor to enter a standby state, and the two-stage air compressor operation scheme is a scheme for controlling the two-stage air compressor to enter a standby state; When it is determined that the value of the to-be-cut peak power is less than the second preset to-be-cut peak power threshold and the pressure state of the gas storage device is not at full load, the two-stage charging-discharging integrated motor operation scheme is a scheme for controlling the rotor of the two-stage charging-discharging integrated motor to rotate, and the two-stage air compressor operation scheme is a scheme for controlling the two-stage air compressor to operate at a preset low load; The value of the power to be peak-cut is determined based on power grid load fluctuation data.

4. The method for time-sharing use of motors in a compressed air energy storage system according to claim 1, characterized in that: The compressed air expansion and power generation subsystem includes a third magnetic clutch, a fourth magnetic clutch, and a first-stage turbine expander and a second-stage turbine expander connected in sequence, the first-stage turbine expander is connected to the fourth magnetic clutch, the fourth magnetic clutch is connected to the second-stage charging and discharging integrated motor, the second-stage turbine expander is connected to the third magnetic clutch, and the third magnetic clutch is connected to the first-stage charging and discharging integrated motor; The control motor group and the compressed air expansion power generation subsystem execute the scheme of using compressed air to generate electricity, including: The third magnetic clutch and the fourth magnetic clutch are controlled to close, and the compressed air in the air storage device is controlled to enter the first-stage turbine expander and the second-stage turbine expander in sequence for expansion and work, so as to drive the first-stage charging and discharging integrated motor and the second-stage charging and discharging integrated motor to generate electricity.

5. The method for time-sharing use of motors in a compressed air energy storage system according to claim 1, characterized in that: The compressed air energy storage system also includes a heat collection and utilization subsystem, which includes a first-level compressor heat exchanger, a second-level compressor heat exchanger, a first-level expander heat exchanger, a second-level expander heat exchanger, a heat storage tank and a cold storage tank. The air outlet end of the first-level compressor heat exchanger and the air outlet end of the second-level compressor heat exchanger are respectively connected to the air inlet end of the heat storage tank, the air inlet end of the first-level expander heat exchanger and the air inlet end of the second-level expander heat exchanger are respectively connected to the air outlet end of the heat storage tank, the air inlet end of the first-level compressor heat exchanger and the air inlet end of the second-level compressor heat exchanger are respectively connected to the air outlet end of the cold storage tank, and the air outlet end of the first-level expander heat exchanger and the air outlet end of the second-level expander heat exchanger are respectively connected to the air inlet end of the cold storage tank.

6. A system for time-sharing motor use in a compressed air energy storage system, characterized in that: The compressed air energy storage system includes an air compression energy storage subsystem and a compressed air expansion power generation subsystem, wherein the air compression energy storage subsystem is used to store compressed air energy, and the compressed air expansion power generation subsystem is used to generate electricity using compressed air, and the air compression energy storage subsystem and the compressed air expansion power generation subsystem share a motor group; The motor time-sharing system for the compressed air energy storage system includes: The peak-shaving plan execution module is used to match and execute the corresponding peak-shaving plan based on the grid peak-shaving instructions, including: When the grid peak-shaving instruction is an energy storage instruction, the peak-shaving scheme is a scheme for controlling the motor group and the air compression energy storage subsystem to perform compressed air energy storage; When the grid peak-shaving instruction is a power generation instruction, the peak-shaving scheme is to control the motor group and the compressed air expansion power generation subsystem to execute a scheme of using compressed air to generate electricity; Wherein, the motor group includes a first-level charging and discharging integrated motor and a second-level charging and discharging integrated motor, the first-level charging and discharging integrated motor is respectively connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem, the second-level charging and discharging integrated motor is respectively connected to the air compression energy storage subsystem and the compressed air expansion power generation subsystem, the first-level charging and discharging integrated motor and the second-level charging and discharging integrated motor are simultaneously connected to the electric energy station, the electric energy station is used to supply power to the first-level charging and discharging integrated motor and the second-level charging and discharging integrated motor, the air compression energy storage subsystem includes a first magnetic clutch, a second magnetic clutch and a first-level air compressor, a second-level air compressor and an air storage device connected in sequence, the air inlet end of the first-level air compressor is connected to the first magnetic clutch, the first magnetic clutch is connected to the first-level charging and discharging integrated motor, the air inlet end of the second-level air compressor is connected to the second magnetic clutch, and the second magnetic clutch is connected to the second-level charging and discharging integrated motor; The matching and executing of a corresponding peak-shaving plan based on the grid peak-shaving instruction also includes: When the grid peak load regulation instruction is a power generation instruction, the peak load regulation scheme also includes an air compression energy storage subsystem control scheme; wherein, The control scheme of the air compression energy storage subsystem includes: Control the first-stage air compressor to enter standby mode; Based on the grid load fluctuation data and the pressure status data of the gas storage device, the secondary charging and discharging integrated motor operation plan and the secondary air compressor operation plan are matched and executed to control the operation of the secondary charging and discharging integrated motor and the secondary air compressor respectively.

7. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is configured to execute the method for time-sharing use of motors in a compressed air energy storage system as claimed in any one of claims 1 to 5.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for time-sharing use of motors in a compressed air energy storage system as described in any one of claims 1 to 5 is implemented.

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