Control method and device for flywheel energy storage system

Abstract

The invention provides a control method and device for a flywheel energy storage system. The method comprises the steps that an electronic control system determines the operation condition of the flywheel energy storage system according to front-end network voltage; if the operation condition is normal operation, the flywheel energy storage system operates in a power mode, and a user scheduling system connected with the interface and communication system determines a discharge power instruction according to the operation condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction; if the operation condition is abnormal operation, the electronic control system determines whether an abnormal voltage stabilization mode needs to be started or not according to the front-end network voltage and a voltage fluctuation threshold value; in the abnormal voltage stabilization mode, the electronic control system switches the electric energy source and the electric load of the control subsystem; and when the operation state returns to normal operation, switching from the abnormal voltage stabilization mode to the power mode. Therefore, the overall stability and safety of the flywheel energy storage system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flywheel energy storage, and in particular to a control method and device for a flywheel energy storage system. Background Art

[0002] The current energy storage methods mainly include chemical energy storage, physical energy storage and other energy storage. Physical energy storage does not have environmental pollution problems and is more suitable for today's development requirements. Physical energy storage methods include pumped energy storage, compressed air energy storage and flywheel energy storage. Among these physical energy storage methods, flywheel energy storage has attracted widespread attention for its outstanding features in service life, charging time, and charging and discharging efficiency. Especially when frequency and peak regulation of the power grid of thermal power plants is required, it requires fast response speed, a large number of frequency and peak regulation times, and a long service life, and the flywheel energy storage method is very suitable.

[0003] The flywheel energy storage system requires coordination and control of the entire system when performing frequency and peak regulation operations. How to coordinate the entire control system when the front-end grid voltage is normal, and how to ensure that the intermediate DC load does not fail and shut down when the front-end grid voltage is abnormal, and how to ensure that the rear-end flywheel shuts down or suspends normally are key issues in the entire flywheel control system. Summary of the invention

[0004] The present invention provides a control method and device for a flywheel energy storage system, which are used to increase the overall stability and safety of the flywheel energy storage system.

[0005] In a first aspect, the present invention provides a control method for a flywheel energy storage system, wherein the flywheel energy storage system comprises: a flywheel, a motor, an electronic control system, and an interface and communication system, and the method comprises:

[0006] The electronic control system determines the operating status of the flywheel energy storage system according to the acquired front-end grid voltage;

[0007] If the operating condition is normal operation, the flywheel energy storage system is operating in power mode, and the user scheduling system connected to the interface and communication system determines the discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction;

[0008] If the operating condition is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode based on the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, the electronic control system switches the control subsystem power source and power load; when the operating state returns to normal operation, it switches from the abnormal voltage stabilization mode to the power mode.

[0009] Optionally, when in the abnormal voltage stabilization mode, the electronic control system switches the control system power source and power load, including:

[0010] Switching the power source of the electronic control system to the motor back electromotive force;

[0011] The electrical load end is switched from the original power source of the flywheel energy storage system to the front-end power grid.

[0012] Optionally, when the operating state returns to normal operation, after switching from the abnormal voltage regulation mode to the power mode, the method further includes:

[0013] When the operating state fails to operate normally, the electronic control system keeps the flywheel energy storage system in the abnormal voltage stabilization mode until the kinetic energy stored in the flywheel energy storage system is exhausted.

[0014] Optionally, the flywheel energy storage system further includes: an energy conversion system, characterized in that the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction, including:

[0015] When the motor drives the flywheel to decelerate, the energy conversion system, under the control of the electronic control system, provides electrical energy to power supply equipment under the same power grid until the kinetic energy stored in the flywheel energy storage system is exhausted;

[0016] When the motor drives the flywheel to accelerate and the flywheel reaches a preset speed or a preset acceleration time, the energy conversion system, under the control of the electronic control system, converts the kinetic energy stored in the flywheel into electrical energy and provides the electrical energy to the power supply equipment under the same power grid.

[0017] In a second aspect, the present invention provides a control device for a flywheel energy storage system, the flywheel energy storage system comprising: a flywheel, a motor, an electronic control system and an interface and communication system, the device comprising:

[0018] An operating status determination module, used to determine the operating status of the flywheel energy storage system according to the acquired front-end grid voltage through the electronic control system;

[0019] A normal operation control module is used for, when the operating condition is normal operation, the flywheel energy storage system is operated in a power mode, and the user scheduling system connected to the interface and the communication system determines a discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction;

[0020] The abnormal operation control module is used for, when the operating condition is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode according to the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, switching the control subsystem power source and power load; when the operating state returns to normal operation, switching from the abnormal voltage stabilization mode to the power mode.

[0021] Optionally, the abnormal operation control module includes:

[0022] A first switching submodule, used for switching the power source end of the electronic control system to the motor back electromotive force;

[0023] The second switching submodule is used to switch the power load end from the original power source of the flywheel energy storage system to the front-end power grid.

[0024] Optionally, the abnormal operation control module further includes:

[0025] The mode holding submodule is used for, when the operating state fails to operate normally, the electronic control system to keep the flywheel energy storage system in the abnormal voltage stabilization mode until the kinetic energy stored in the flywheel energy storage system is exhausted.

[0026] Optionally, the flywheel energy storage system further includes: an energy conversion system, and the normal operation control module includes:

[0027] A deceleration control submodule, used for, when the motor drives the flywheel to decelerate, the energy conversion system, under the control of the electronic control system, provides electrical energy to power supply equipment under the same power grid until the kinetic energy stored in the flywheel energy storage system is exhausted;

[0028] The acceleration control submodule is used for converting the kinetic energy stored in the flywheel into electrical energy under the control of the electronic control system when the motor drives the flywheel to accelerate and the flywheel reaches a preset speed or a preset acceleration time, and providing the electrical energy to the power supply equipment under the same power grid.

[0029] In a third aspect, the present application provides an electronic device, comprising a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect are performed.

[0030] In a fourth aspect, the present application provides a storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps in the method provided in the first aspect are performed.

[0031] It can be seen from the above technical solutions that the present invention has the following advantages:

[0032] The present invention provides a control method and device for a flywheel energy storage system, the flywheel energy storage system comprising: a flywheel, a motor, an electronic control system and an interface and communication system, the method comprising: the electronic control system determines the operating status of the flywheel energy storage system according to the obtained front-end network voltage; if the operating status is normal operation, the flywheel energy storage system is operated in a power mode, and the user scheduling system connected to the interface and communication system determines the discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction; if the operating status is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode according to the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, the electronic control system switches the control subsystem power source and power load; when the operating state returns to normal operation, it switches from the abnormal voltage stabilization mode to the power mode. By establishing a control scheme of the flywheel energy storage system under normal front-end network voltage, and a control scheme of the flywheel energy storage system under abnormal front-end network voltage, the overall stability and safety of the flywheel energy storage system are increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 A flowchart of a control method for a flywheel energy storage system according to a first embodiment of the present invention;

[0035] Figure 2 A flowchart of a second embodiment of a control method for a flywheel energy storage system of the present invention;

[0036] Figure 3 The present invention is a structural block diagram of a control device embodiment of a flywheel energy storage system. DETAILED DESCRIPTION

[0037] The embodiments of the present invention provide a control method and device for a flywheel energy storage system, which are used to increase the overall stability and safety of the flywheel energy storage system.

[0038] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] For example, see Figure 1 , Figure 1 The present invention is a flow chart of a control method for a flywheel energy storage system according to a first embodiment of the present invention. The flywheel energy storage system comprises: a flywheel, a motor, an electronic control system, and an interface and communication system. The method comprises:

[0040] S101, the electronic control system determines the operating status of the flywheel energy storage system according to the acquired front-end grid voltage;

[0041] S102, if the operating condition is normal operation, the flywheel energy storage system is operating in power mode, and the user scheduling system connected to the interface and communication system determines a discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction;

[0042] S103, if the operating condition is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode based on the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, the electronic control system switches the control subsystem power source and power load; when the operating state returns to normal operation, it switches from the abnormal voltage stabilization mode to the power mode.

[0043] In a control method of a flywheel energy storage system provided in an embodiment of the present invention, the flywheel energy storage system includes: a flywheel, a motor, an electronic control system and an interface and communication system, and the method includes: the electronic control system determines the operating status of the flywheel energy storage system according to the obtained front-end network voltage; if the operating status is normal operation, the flywheel energy storage system is operated in power mode, and the user scheduling system connected to the interface and communication system determines the discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction; if the operating status is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode according to the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, the electronic control system switches the control subsystem power source and power load; when the operating state returns to normal operation, it switches from the abnormal voltage stabilization mode to the power mode. By establishing a control scheme for the flywheel energy storage system under normal front-end network voltage, and a control scheme for the flywheel energy storage system under abnormal front-end network voltage, the overall stability and safety of the flywheel energy storage system are increased.

[0044] For example 2, please refer to Figure 2 , Figure 2 This is a flow chart of a control method for a flywheel energy storage system according to a second embodiment of the present invention. The flywheel energy storage system includes: a flywheel, a motor, an electronic control system, and an interface and communication system. The method includes:

[0045] Step S201, the electronic control system determines the operating status of the flywheel energy storage system according to the acquired front-end grid voltage;

[0046] It should be noted that the flywheel energy storage system is mainly composed of the following components: (1) Flywheel: As the core component, the flywheel is made of high-strength materials and can rotate to store a large amount of mechanical energy; (2) Motor: used to convert electrical energy into mechanical energy, and store electrical energy in the kinetic energy of the flywheel by driving the flywheel to rotate at high speed; (3) Electronic control system: monitors and controls the operation of the flywheel energy storage system, including monitoring parameters such as flywheel speed, temperature and vibration, and controlling energy input and output; (4) Interface and communication system: used for data interaction and communication with other systems, such as information transmission and coordination with power supply system, energy conversion system, etc.; (5) Power supply system: provides electrical energy to the motor and ensures that electrical energy is smoothly converted into mechanical energy and stored in the flywheel. Usually includes batteries, supercapacitors or other energy storage devices; (6) Energy conversion system: converts the mechanical energy stored in the flywheel into electrical energy to achieve energy release and utilization. This system usually includes a generator or power inverter; (7) Cooling system: used to stabilize the temperature of the flywheel, prevent overheating and ensure that the system is within a safe operating temperature range. Air cooling or liquid cooling is usually used to dissipate heat; (8) Monitoring and protection system: real-time monitoring of the operating status of the flywheel, including parameters such as speed, temperature and vibration, and taking corresponding measures to protect the system from damage due to overload and failure; (9) Safety system: ensure the safety of operators and the environment, including safety switches, protective covers and emergency stop buttons.

[0047] The control method of the flywheel energy storage system in the embodiment of the present invention can be controlled in a two-level inverter system and is also applicable to a three-level inverter system. At the same time, the control method of the embodiment of the present invention is not only for the normal operation of the flywheel, but also for the zero-speed start-up and speed start-up processes. In addition, although the control method of the flywheel energy storage system in the embodiment of the present invention is mainly for the control of the motor in the generator mode during the discharge process of the flywheel energy storage system, it is also applicable to the motor mode during the charging process of the flywheel energy storage system.

[0048] Step S202, if the operating condition is normal operation, the flywheel energy storage system is operating in power mode, and the user scheduling system connected to the interface and communication system determines the discharge power instruction according to the operating condition information; when the motor drives the flywheel to decelerate, the energy conversion system, under the control of the electronic control system, provides electrical energy to the power supply equipment under the same power grid until the kinetic energy stored in the flywheel energy storage system is exhausted; when the motor drives the flywheel to accelerate, and the flywheel reaches a preset speed or a preset acceleration time, the energy conversion system, under the control of the electronic control system, converts the kinetic energy stored in the flywheel into electrical energy, and provides electrical energy to the power supply equipment under the same power grid;

[0049] In an embodiment of the present invention, when the front-end grid voltage is normal, the entire flywheel energy storage system is in normal power mode to respond to the customer's dispatching instructions. The customer's dispatching instructions are generally power instructions. When the electronic control system receives the corresponding power instruction, it responds to the corresponding power instruction, controls the motor to accelerate or decelerate, and drives the flywheel to accelerate or decelerate. When decelerating, the kinetic energy of the flywheel is converted into electrical energy. The entire flywheel energy storage system is in generator mode, providing stable electrical energy to the power supply equipment under the same power grid until the kinetic energy inside the flywheel storage system is completely exhausted. When accelerating, the energy conversion system, under the control of the electronic control system, converts the kinetic energy stored in the flywheel into electrical energy, and provides this electrical energy to the power supply equipment under the unified power grid.

[0050] Step S203, if the operating status is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode according to the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, the electronic control system switches the power source end of the electronic control system to the motor back electromotive force, and switches the power load end from the original power supply of the flywheel energy storage system to the front-end power grid; when the operating state returns to normal operation, it switches from the abnormal voltage stabilization mode to the power mode; when the operating state fails to operate normally, the electronic control system keeps the flywheel energy storage system in the abnormal voltage stabilization mode until the kinetic energy stored in the flywheel energy storage system is exhausted.

[0051] In an embodiment of the present invention, when the front-end grid voltage is abnormal, especially when high or low penetration occurs, in order to ensure the stability of the magnetic levitation system, the electronic control system needs to stabilize the DC voltage at a constant value to ensure the stability of the magnetic levitation system.

[0052] In the specific implementation, when the front-end grid voltage is abnormal, the inverter in the electronic control system automatically enters the abnormal voltage stabilization mode from the normal power mode according to the limit of the grid voltage fluctuation. At the same time, the electronic control system switches its own power source end to the motor back electromotive force, and switches the power load end to the front-end grid. After the front-end grid voltage is restored, it automatically switches from the voltage stabilization mode to the success mode. When the operating status fails to operate normally, the electronic control system keeps the flywheel energy storage system in the abnormal voltage stabilization mode until the kinetic energy stored in the flywheel energy storage system is exhausted.

[0053] In general, when the front-end grid voltage is normal and the flywheel energy storage system is operating normally, the electronic control system uses power as the control target during the entire control process. When the flywheel rotates under normal circumstances, there will be kinetic energy. When the power quality of the power grid is detected to have changed, the DC voltage of the flywheel energy storage system will be judged first. When the DC voltage is within the normal range, that is, when the front-end grid voltage is normal, the command will be issued with power as the control target. Therefore, during the entire operation process, whether it is zero-speed starting or speed starting, as well as normal operation, the motor object is controlled by power, that is, the inverter side performs power closed-loop control. Although there will be errors in the process of calculating the current value by power, the errors can be reduced by a closed-loop control. Similarly, the motor is controlled by the same principle in the motor mode. When the DC voltage is not within the normal range, that is, when the front-end grid voltage is abnormal, in order to ensure the normal operation of the DC energy-taking control system, the entire electronic control system will automatically switch to a mode with the motor back electromotive force as the power supply. At this time, the inverter side controls the motor object by voltage. By establishing a control scheme for the flywheel energy storage system under normal front-end grid pressure and a control scheme for the flywheel energy storage system under abnormal front-end grid pressure, the overall stability and safety of the flywheel energy storage system are increased.

[0054] For example 3, please refer to Figure 3 , Figure 3 The structure block diagram of a control device embodiment of a flywheel energy storage system of the present invention includes:

[0055] An operating status determination module 501 is used to determine the operating status of the flywheel energy storage system according to the acquired front-end grid voltage through the electronic control system;

[0056] The normal operation control module 502 is used for, when the operating condition is normal operation, the flywheel energy storage system is operated in a power mode, and the user scheduling system connected to the interface and the communication system determines the discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction;

[0057] The abnormal operation control module 503 is used for, when the operating condition is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode according to the front-end network voltage and the acquired voltage fluctuation threshold; when in the abnormal voltage stabilization mode, switching the control subsystem power source and power load; when the operating state returns to normal operation, switching from the abnormal voltage stabilization mode to the power mode.

[0058] In an optional embodiment, the abnormal operation control module includes:

[0059] A first switching submodule, used for switching the power source end of the electronic control system to the motor back electromotive force;

[0060] The second switching submodule is used to switch the power load end from the original power source of the flywheel energy storage system to the front-end power grid.

[0061] In an optional embodiment, the abnormal operation control module further includes:

[0062] The mode holding submodule is used for, when the operating state fails to operate normally, the electronic control system to keep the flywheel energy storage system in the abnormal voltage stabilization mode until the kinetic energy stored in the flywheel energy storage system is exhausted.

[0063] In an optional embodiment, the flywheel energy storage system further includes: an energy conversion system, characterized in that the normal operation control module includes:

[0064] A deceleration control submodule, used for, when the motor drives the flywheel to decelerate, the energy conversion system, under the control of the electronic control system, provides electrical energy to power supply equipment under the same power grid until the kinetic energy stored in the flywheel energy storage system is exhausted;

[0065] The acceleration control submodule is used for converting the kinetic energy stored in the flywheel into electrical energy under the control of the electronic control system when the motor drives the flywheel to accelerate and the flywheel reaches a preset speed or a preset acceleration time, and providing the electrical energy to the power supply equipment under the same power grid.

[0066] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of a control method for a flywheel energy storage system as described in any of the above embodiments.

[0067] An embodiment of the present invention further provides a computer storage medium on which a computer program is stored. When the computer program is executed by the processor, the steps of a control method for a flywheel energy storage system as described in any of the above embodiments are implemented.

[0068] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0069] In the several embodiments provided in the present application, it should be understood that the methods, devices, electronic devices and storage media disclosed in the present invention can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0070] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0071] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0072] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0073] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a flywheel energy storage system, the flywheel energy storage system comprising: A flywheel, a motor, an electronic control system and an interface and communication system, characterized in that the method comprises: The electronic control system determines the operating status of the flywheel energy storage system according to the acquired front-end grid voltage; If the operating condition is normal operation, the flywheel energy storage system is operating in power mode, and the user scheduling system connected to the interface and communication system determines the discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction; If the operating condition is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode based on the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, the electronic control system switches the control subsystem power source and power load; when the operating state returns to normal operation, it switches from the abnormal voltage stabilization mode to the power mode.

2. The control method of the flywheel energy storage system according to claim 1, characterized in that: When in the abnormal voltage stabilization mode, the electronic control system switches the control system power source and power load, including: Switching the power source of the electronic control system to the motor back electromotive force; The electrical load end is switched from the original power source of the flywheel energy storage system to the front-end power grid.

3. The control method of the flywheel energy storage system according to claim 1, characterized in that: When the operating state returns to normal operation, after switching from the abnormal voltage stabilization mode to the power mode, the method further includes: When the operating state fails to operate normally, the electronic control system keeps the flywheel energy storage system in the abnormal voltage stabilization mode until the kinetic energy stored in the flywheel energy storage system is exhausted.

4. The control method of the flywheel energy storage system according to claim 1, wherein the flywheel energy storage system further comprises: The energy conversion system is characterized in that the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction, including: When the motor drives the flywheel to decelerate, the energy conversion system, under the control of the electronic control system, provides electrical energy to power supply equipment under the same power grid until the kinetic energy stored in the flywheel energy storage system is exhausted; When the motor drives the flywheel to accelerate and the flywheel reaches a preset speed or a preset acceleration time, the energy conversion system, under the control of the electronic control system, converts the kinetic energy stored in the flywheel into electrical energy and provides the electrical energy to the power supply equipment under the same power grid.

5. A control device for a flywheel energy storage system, the flywheel energy storage system comprising: Flywheel, motor, electronic control system and interface and communication system, characterized in that the device includes: An operating status determination module, used to determine the operating status of the flywheel energy storage system according to the acquired front-end grid voltage through the electronic control system; A normal operation control module is used for, when the operating condition is normal operation, the flywheel energy storage system is operated in a power mode, and the user scheduling system connected to the interface and the communication system determines a discharge power instruction according to the operating condition information; the electronic control system controls the motor to drive the flywheel to accelerate or decelerate according to the power instruction; The abnormal operation control module is used for, when the operating condition is abnormal operation, the electronic control system determines whether it is necessary to start the abnormal voltage stabilization mode according to the front-end network voltage and the obtained voltage fluctuation threshold; when in the abnormal voltage stabilization mode, switching the control subsystem power source and power load; when the operating state returns to normal operation, switching from the abnormal voltage stabilization mode to the power mode.

6. The control device of the flywheel energy storage system according to claim 5, characterized in that: The abnormal operation control module includes: A first switching submodule, used for switching the power source end of the electronic control system to the motor back electromotive force; The second switching submodule is used to switch the power load end from the original power source of the flywheel energy storage system to the front-end power grid.

7. The control device of the flywheel energy storage system according to claim 5, characterized in that: The abnormal operation control module also includes: The mode holding submodule is used for, when the operating state fails to operate normally, the electronic control system to keep the flywheel energy storage system in the abnormal voltage stabilization mode until the kinetic energy stored in the flywheel energy storage system is exhausted.

8. The control device of the flywheel energy storage system according to claim 5, wherein the flywheel energy storage system further comprises: The energy conversion system is characterized in that the normal operation control module comprises: A deceleration control submodule, which is used for, when the motor drives the flywheel to decelerate, the energy conversion system, under the control of the electronic control system, provides electrical energy to power supply equipment under the same power grid until the kinetic energy stored in the flywheel energy storage system is exhausted; The acceleration control submodule is used for converting the kinetic energy stored in the flywheel into electrical energy under the control of the electronic control system when the motor drives the flywheel to accelerate and the flywheel reaches a preset speed or a preset acceleration time, and providing the electrical energy to the power supply equipment under the same power grid.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 4 is executed.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is performed.

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