Flywheel energy storage inertia regulation system for wind power stabilization

Abstract

The application discloses a flywheel energy storage inertia regulating system for wind power stabilization, which comprises a mechanical system, an electrical system, a control system and an auxiliary system. The mechanical system is used for realizing high-speed rotation storage and low-loss maintenance of mechanical energy; the electrical system is used for high-efficiency bidirectional conversion between electric energy and mechanical energy and power regulation; the control system is used for sensing operation states and executing accurate control and protection decisions; the auxiliary system is used for maintaining the physical environment for operation of the mechanical system and providing safety guarantee; and the configuration system is used for safe connection with a power grid and energy optimization scheduling at a system level. The mechanical system comprises a flywheel rotor used for storing mechanical energy in the form of high-speed rotation and a rotating shaft used for connecting the flywheel rotor and a motor rotor. The application relates to the technical field of wind power systems. The application can realize dynamic adjustment of output power according to the randomness, intermittence and turbulence change of wind speed, avoid causing power grid frequency deviation and voltage flicker, increase system frequency modulation pressure, and effectively ensure power quality.

Description

Technical Field

[0001] This invention relates to the field of wind power system technology, specifically a flywheel energy storage inertial regulation system for stabilizing wind power. Background Technology

[0002] Wind turbine flywheel energy storage system is a physical energy storage solution designed to smooth wind power fluctuations and improve grid stability. The core of it is to convert electrical energy into kinetic energy storage through a high-speed rotating flywheel. It can respond in milliseconds when wind power output changes suddenly and quickly release or absorb power.

[0003] However, due to the randomness, intermittency, and turbulent variations in wind speed, traditional wind turbine flywheel energy storage systems experience output power fluctuations during operation. These fluctuations can cause grid frequency deviations and voltage flicker, increasing the pressure on system frequency regulation and reducing power quality. Furthermore, severe power fluctuations can exacerbate mechanical stress on wind turbines, shortening equipment lifespan.

[0004] To address these issues, the present invention provides a flywheel energy storage inertial regulation system for stabilizing wind power. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a flywheel energy storage inertial regulation system for stabilizing wind power, thus solving the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a flywheel energy storage inertial regulation system for wind power stabilization, comprising:

[0007] Mechanical systems used to achieve high-speed rotational storage and low-loss retention of mechanical energy;

[0008] Electrical systems are used for efficient bidirectional conversion and power regulation between electrical energy and mechanical energy;

[0009] Control systems are used to sense the operating status and execute precise control and protection decisions;

[0010] Auxiliary systems are used to maintain the physical environment for the operation of mechanical systems and to provide safety assurance.

[0011] Configure the system for secure connection to the power grid and system-level energy optimization scheduling.

[0012] Preferably, the mechanical system includes:

[0013] Flywheel rotors are used to store mechanical energy in the form of high-speed rotation;

[0014] The shaft is used to connect the flywheel rotor and the motor rotor, transmit electromagnetic torque, and provide a supporting reference surface for the bearings;

[0015] Automatic balancing module, used in conjunction with bearing assembly to eliminate rotor imbalance vibration.

[0016] Preferably, the automatic balancing module includes:

[0017] The magnetic bearing mechanism detects vibration displacement signals through a magnetic bearing mechanism controller.

[0018] The adaptive algorithm model generates an orthogonal reference signal that is strictly synchronized with the rotor by using the rotational speed reference, and iteratively updates the weights with the current residual of the magnetic bearing mechanism as the error. Then, it synthesizes a compensating force, which is superimposed on the current command of the magnetic bearing mechanism to generate an electromagnetic force that cancels the imbalance.

[0019] The mechanical balancing mechanism is used to perform physical counterweighting in conjunction with an adaptive algorithm model when vibration continues to exceed limits. After mechanical correction, the electromagnetic weight decays to zero, restoring low-power operation.

[0020] Preferably, the electrical system includes:

[0021] The motor acts as a motor to drive the flywheel to accelerate and store energy during charging, and as a generator to convert the flywheel's kinetic energy into electrical energy output during discharging.

[0022] The DC bus and capacitors are used to connect the machine-side converter and the grid-side converter, providing a channel for instantaneous power exchange and suppressing DC voltage fluctuations.

[0023] The machine-side converter is used to connect the motor to the DC bus, enabling precise control of the motor torque and speed, and completing bidirectional conversion between DC and AC power based on the motor current vector.

[0024] The grid-side converter is used to connect the DC bus to the power grid, maintain the DC bus voltage stability, realize power exchange with the power grid, and control the amplitude, phase and power factor of the grid-connected current.

[0025] The motor discretization model is used to predict the future state trajectory in a finite time domain in each control cycle. The optimal control quantity is solved by rolling optimization so that the predicted output tracks the reference value and satisfies the constraints. Finally, only the first control quantity is executed, and the process is repeated in the next cycle.

[0026] Preferably, the control system includes:

[0027] Photoelectric encoders are used to detect the angular position of the rotor through a grating disk and photoelectric elements, output high-precision pulse signals, calculate the real-time speed and absolute position of the rotor, and provide a reference for motor vector control and displacement calculation of magnetic bearing mechanisms.

[0028] A rotary transformer is used to sense the rotor position through sine and cosine windings.

[0029] A thermistor is embedded inside the stator winding to monitor the temperature rise of the copper wire in real time.

[0030] Temperature sensors are used to identify overload in magnetic bearing mechanisms, protect bearings from abnormal contact, and detect lubrication failure.

[0031] The real-time controller is used to precisely control the electromagnetic torque of the motor through the machine-side converter according to the upper-level instructions, so as to achieve constant power charging and discharging of the flywheel, compare the actual speed with the safety threshold in real time, linearly reduce the charging power when it approaches the upper limit, and force the switch to standby or discharge mode when the upper limit is reached.

[0032] The grid-connected coordination controller is used to receive wind power smoothing target values ​​or frequency regulation dispatch commands and convert them into flywheel charging and discharging power set values;

[0033] The inertial response control unit is used to simulate the motion equation of the synchronous generator rotor, so that the flywheel exhibits inertia and damping characteristics.

[0034] Preferably, the auxiliary system includes:

[0035] The cooling mechanism is used to remove the heat generated by the copper and iron losses of the motor and keep the winding temperature below the insulation class limit.

[0036] The heat dissipation mechanism is used to ensure the insulation and magnetic properties of the magnetic bearing mechanism coil and maintain its stable operating temperature.

[0037] Preferably, the configuration system includes:

[0038] Grid connection interface, used to match the grid voltage level;

[0039] An energy management system is used to optimize charging and discharging strategies.

[0040] Preferably, the grid connection interface includes:

[0041] A grid-connected transformer is used to raise the output voltage of a flywheel converter to the grid voltage level to meet grid connection voltage requirements.

[0042] The disconnecting switch creates a clear disconnect point during inspection or maintenance, ensuring electrical isolation between the flywheel side and the power grid side and protecting the safety of maintenance personnel.

[0043] Grounding switches are used to reliably ground the flywheel side circuit after the equipment is shut down for maintenance, to release residual charge and prevent induced voltage from injuring people;

[0044] LCL filters are used to suppress harmonic currents generated by high-frequency switching of converters from being injected into the power grid.

[0045] The static var generator supplements reactive power to maintain stable grid connection voltage when the flywheel converter is running at full power and the remaining capacity is insufficient.

[0046] Preferably, the energy management system includes:

[0047] The industrial control server is used to run energy management algorithms and databases, and to handle multi-source data fusion, strategy optimization and command issuance.

[0048] The charging and discharging strategy optimization engine is used to output the optimal charging and discharging power curve in real time based on flywheel SOC constraints, grid dispatch instructions and electricity price signals, and equipment health status and lifespan loss.

[0049] The mode manager is used to automatically switch the flywheel operating mode according to grid demand and wind power status;

[0050] The power quality decomposer is used to decompose the total power command calculated by the EMS into the individual power settings of each flywheel unit, and then send them to the local controller of each flywheel via the communication link.

[0051] Preferably, it also includes an emergency stop system, which is used to trigger hard-wired interlocking logic in abnormal operating conditions such as overspeed, overtemperature, and vacuum failure, automatically cut off the main power supply, start the backup power supply to maintain the levitation of the magnetic bearing mechanism, and ensure that the system enters the preset safe state.

[0052] Beneficial effects

[0053] This invention provides a flywheel energy storage inertial regulation system for stabilizing wind power. Compared with existing technologies, it has the following advantages:

[0054] (1) The wind power stabilization flywheel energy storage inertial regulation system can dynamically adjust the output power according to the randomness, intermittency and turbulence of wind speed, avoid causing grid frequency deviation and voltage flicker, increase the frequency regulation pressure of the system, and effectively ensure power quality.

[0055] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] Example 1:

[0058] Please see Figure 1 A flywheel energy storage inertial regulation system for stabilizing wind power includes:

[0059] Mechanical systems used to achieve high-speed rotational storage and low-loss retention of mechanical energy;

[0060] Electrical systems are used for efficient bidirectional conversion and power regulation between electrical energy and mechanical energy;

[0061] Control systems are used to sense the operating status and execute precise control and protection decisions;

[0062] Auxiliary systems are used to maintain the physical environment for the operation of mechanical systems and to provide safety assurance.

[0063] Configure the system for secure connection to the power grid and system-level energy optimization scheduling;

[0064] In this embodiment, the mechanical system includes:

[0065] Flywheel rotors are used to store mechanical energy in the form of high-speed rotation;

[0066] More specifically, the flywheel rotor stores mechanical energy in the form of high-speed rotation, and the whole is forged from alloy steel to ensure its structural strength while also facilitating production;

[0067] The high-speed motor rotor is used to work with the stator to complete energy conversion. It is machined as an integral part of the shaft or connected by a heat-shrink fitting, and is located between the flywheel rotor and the bearing.

[0068] The shaft is used to connect the flywheel rotor and the motor rotor, transmit electromagnetic torque, and provide a supporting reference surface for the bearings;

[0069] More specifically, the shaft is made of high-strength alloy steel and is connected to the flywheel rotor by interference fit and end face key or is integrally machined into one piece;

[0070] Automatic balancing module, used in conjunction with bearing assembly to eliminate rotor imbalance vibration;

[0071] In this embodiment, the automatic balancing module includes:

[0072] The magnetic bearing mechanism detects vibration displacement signals through a magnetic bearing mechanism controller.

[0073] More specifically, the magnetic bearing mechanism includes:

[0074] Radial magnetic bearings, arranged in pairs, provide radial four-degree-of-freedom support;

[0075] Axial magnetic bearings provide axial single-degree-of-freedom support;

[0076] Displacement sensors are used to monitor rotor position in real time for closed-loop control.

[0077] The protective bearing, which is an angular contact ball bearing or a sliding bearing, is used for emergency support in the event of failure or power failure of the magnetic levitation system to prevent the rotor from colliding with the stator.

[0078] The adaptive algorithm model generates an orthogonal reference signal that is strictly synchronized with the rotor by using the rotational speed reference, and iteratively updates the weights with the current residual of the magnetic bearing mechanism as the error. Then, it synthesizes a compensating force, which is superimposed on the current command of the magnetic bearing mechanism to generate an electromagnetic force that cancels the imbalance.

[0079] The mechanical balancing mechanism is used to perform physical counterweighting in conjunction with an adaptive algorithm model when vibration continues to exceed limits. After mechanical correction is completed, the electromagnetic weight decays to zero, restoring low-power operation.

[0080] In more detail, the core logical relationships of the adaptive algorithm model are as follows:

[0081] Rotor imbalance generates synchronous disturbance force in the rotating coordinate system (rotational speed ω), as shown in the following formula:

[0082]

[0083] in, , For the force components to be identified, ,

[0084] The formula for the linearization model of electromagnetic force in a magnetic bearing is as follows:

[0085]

[0086] in, For current stiffness, For displacement negative stiffness, To control the current, This represents the rotor displacement;

[0087] Furthermore, the core logic of the adaptive algorithm model adopts an LMS adaptive filtering structure:

[0088] The LMS algorithm's iterative weight update formula is:

[0089]

[0090]

[0091] in, and For adaptive weights, The step size factor controls the convergence speed and stability. For the first Step current residual, The sampling period is and This is an orthogonal reference signal synchronously generated by a PLL phase-locked loop;

[0092] The formula for compensating force output is:

[0093]

[0094] In summary, the superimposed current command to the magnetic bearing generates an electromagnetic force that cancels out the imbalance.

[0095] Furthermore, the convergence condition for the step size factor is: 0 < < ,in, The largest eigenvalue of the autocorrelation matrix of the input signal is used; a conservative value is actually taken.

[0096] Among them, when the value of μ is large, the convergence speed is fast (<1s), the steady-state fluctuation is large, and it is suitable for the startup phase and sudden imbalance.

[0097] When μ is small, the convergence speed is slow (>10s), the steady-state turbulence is small, and it is suitable for steady-state operation and precision balancing.

[0098] When the step size of μ changes, the convergence speed is adaptively switched, and the steady-state adjustment is balanced. Applicable scenarios: large at startup → small at steady state.

[0099] In summary, by identifying and feeding forward to cancel synchronous disturbances in real time in a rotating coordinate system, the magnetic bearing is transformed from passively bearing imbalance to actively adapting to imbalance. This is the key control layer for achieving long-term maintenance-free operation of flywheel energy storage.

[0100] In this embodiment, the electrical system includes:

[0101] The motor acts as a motor to drive the flywheel to accelerate and store energy during charging, and as a generator to convert the flywheel's kinetic energy into electrical energy output during discharging.

[0102] The DC bus and capacitors are used to connect the machine-side converter and the grid-side converter, providing a channel for instantaneous power exchange and suppressing DC voltage fluctuations.

[0103] The machine-side converter is used to connect the motor to the DC bus, enabling precise control of the motor torque and speed, and completing bidirectional conversion between DC and AC power based on the motor current vector.

[0104] The grid-side converter is used to connect the DC bus to the power grid, maintain the DC bus voltage stability, realize power exchange with the power grid, and control the amplitude, phase and power factor of the grid-connected current.

[0105] The motor discretization model is used to predict the state trajectory in the future finite time domain in each control cycle. The optimal control quantity is solved by rolling optimization so that the predicted output tracks the reference value and satisfies the constraints. Finally, only the first control quantity is executed, and the process is repeated in the next cycle.

[0106] In more detail, the steps for establishing the discretized model of the motor are as follows:

[0107] The first step is to establish a predictive model. Taking a permanent magnet synchronous motor as an example, the voltage equation in the rotating coordinate system (dq) is as follows:

[0108]

[0109]

[0110] Discretization yields the state-space form:

[0111]

[0112] Among them, state = Control quantity = Matrix A, B are time-dependent variable speeds ；

[0113] The second step is to define the prediction time domain and optimization objectives;

[0114] 1. Prediction in the time domain The number of future state steps that need to be predicted;

[0115] 2. Control Time Domain The number of control steps that need to be optimized in the future;

[0116] The third step is to apply constraints.

[0117] The fourth step is to perform rolling optimization to solve the problem.

[0118] The fifth step is to execute and provide feedback on the correction.

[0119] In this embodiment, the control system includes:

[0120] Photoelectric encoders are used to detect the angular position of the rotor through a grating disk and photoelectric elements, output high-precision pulse signals, calculate the real-time speed and absolute position of the rotor, and provide a reference for motor vector control and displacement calculation of magnetic bearing mechanisms.

[0121] In summary, using model information to predict system behavior in advance and find the optimal control trajectory within the constraint boundary is particularly suitable for high-speed, high-dynamic, and multi-constraint coupled electromechanical systems such as flywheels.

[0122] A rotary transformer is used to sense the rotor position through sine and cosine windings.

[0123] A thermistor is embedded inside the stator winding to monitor the temperature rise of the copper wire in real time.

[0124] Temperature sensors are used to identify overload in magnetic bearing mechanisms, protect bearings from abnormal contact, and detect lubrication failure.

[0125] The real-time controller is used to precisely control the electromagnetic torque of the motor through the machine-side converter according to the upper-level instructions, so as to achieve constant power charging and discharging of the flywheel, compare the actual speed with the safety threshold in real time, linearly reduce the charging power when it approaches the upper limit, and force the switch to standby or discharge mode when the upper limit is reached.

[0126] The grid-connected coordination controller is used to receive wind power smoothing target values ​​or frequency regulation dispatch commands and convert them into flywheel charging and discharging power set values;

[0127] The inertial response control unit is used to simulate the motion equation of the synchronous generator rotor, so that the flywheel exhibits inertial and damping characteristics.

[0128] In this embodiment, the auxiliary system includes:

[0129] The cooling mechanism is used to remove the heat generated by the copper and iron losses of the motor and keep the winding temperature below the insulation class limit.

[0130] The heat dissipation mechanism is used to ensure the insulation and magnetic properties of the magnetic bearing mechanism coil and maintain its stable operating temperature.

[0131] In this embodiment, the configuration system includes:

[0132] Grid connection interface, used to match the grid voltage level;

[0133] In this embodiment, the grid connection interface includes:

[0134] A grid-connected transformer is used to raise the output voltage of a flywheel converter to the grid voltage level to meet grid connection voltage requirements.

[0135] The disconnecting switch creates a clear disconnect point during inspection or maintenance, ensuring electrical isolation between the flywheel side and the power grid side and protecting the safety of maintenance personnel.

[0136] Grounding switches are used to reliably ground the flywheel side circuit after the equipment is shut down for maintenance, to release residual charge and prevent induced voltage from injuring people;

[0137] LCL filters are used to suppress harmonic currents generated by high-frequency switching of converters from being injected into the power grid.

[0138] The static var generator supplements reactive power support and maintains stable grid connection voltage when the flywheel converter is running at full power and the remaining capacity is insufficient.

[0139] Energy management system, used to optimize charging and discharging strategies;

[0140] In this embodiment, the energy management system includes:

[0141] The industrial control server is used to run energy management algorithms and databases, and to handle multi-source data fusion, strategy optimization and command issuance.

[0142] The charging and discharging strategy optimization engine is used to output the optimal charging and discharging power curve in real time based on flywheel SOC constraints, grid dispatch instructions and electricity price signals, and equipment health status and lifespan loss.

[0143] The mode manager is used to automatically switch the flywheel operating mode according to grid demand and wind power status;

[0144] The power quality decomposer is used to decompose the total power command calculated by EMS into the individual power setpoints of each flywheel unit, and send them to the local controller of each flywheel via the communication link.

[0145] In this embodiment, an emergency stop system is also included, which is used to trigger hard-wired interlocking logic under abnormal operating conditions such as overspeed, overtemperature, and vacuum failure, automatically cut off the main power supply, start the backup power supply to maintain the levitation of the magnetic bearing mechanism, and ensure that the system enters a preset safe state.

[0146] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0147] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0148] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for stabilizing wind power, characterized in that: include: Mechanical systems used to achieve high-speed rotational storage and low-loss retention of mechanical energy; Electrical systems are used for efficient bidirectional conversion and power regulation between electrical energy and mechanical energy; Control systems are used to sense the operating status and execute precise control and protection decisions; Auxiliary systems are used to maintain the physical environment for the operation of mechanical systems and to provide safety assurance. Configure the system for secure connection to the power grid and system-level energy optimization scheduling.

2. The flywheel energy storage inertial regulation system for stabilizing wind power according to claim 1, characterized in that: The mechanical system includes: Flywheel rotors are used to store mechanical energy in the form of high-speed rotation; The shaft is used to connect the flywheel rotor and the motor rotor, transmit electromagnetic torque, and provide a supporting reference surface for the bearings; Automatic balancing module, used in conjunction with bearing assembly to eliminate rotor imbalance vibration.

3. The flywheel energy storage inertial regulation system for stabilizing wind power according to claim 2, characterized in that: The automatic balancing module includes: The magnetic bearing mechanism detects vibration displacement signals through a magnetic bearing mechanism controller. The adaptive algorithm model generates an orthogonal reference signal that is strictly synchronized with the rotor by using the rotational speed reference, and iteratively updates the weights with the current residual of the magnetic bearing mechanism as the error. Then, it synthesizes a compensating force, which is superimposed on the current command of the magnetic bearing mechanism to generate an electromagnetic force that cancels the imbalance. The mechanical balancing mechanism is used to perform physical counterweighting in conjunction with an adaptive algorithm model when vibration continues to exceed limits. After mechanical correction, the electromagnetic weight decays to zero, restoring low-power operation.

4. The flywheel energy storage inertial regulation system for stabilizing wind power according to claim 1, characterized in that: The electrical system includes: The motor acts as a motor to drive the flywheel to accelerate and store energy during charging, and as a generator to convert the flywheel's kinetic energy into electrical energy output during discharging. The DC bus and capacitors are used to connect the machine-side converter and the grid-side converter, providing a channel for instantaneous power exchange and suppressing DC voltage fluctuations. The machine-side converter is used to connect the motor to the DC bus, enabling precise control of the motor torque and speed, and completing bidirectional conversion between DC and AC power based on the motor current vector. The grid-side converter is used to connect the DC bus to the power grid, maintain the DC bus voltage stability, realize power exchange with the power grid, and control the amplitude, phase and power factor of the grid-connected current. The motor discretization model is used to predict the future state trajectory in a finite time domain in each control cycle. The optimal control quantity is solved by rolling optimization so that the predicted output tracks the reference value and satisfies the constraints. Finally, only the first control quantity is executed, and the process is repeated in the next cycle.

5. The flywheel energy storage inertial regulation system for wind power stabilization according to claim 1, characterized in that: The control system includes: Photoelectric encoders are used to detect the angular position of the rotor through a grating disk and photoelectric elements, output high-precision pulse signals, calculate the real-time speed and absolute position of the rotor, and provide a reference for motor vector control and displacement calculation of magnetic bearing mechanisms. A rotary transformer is used to sense the rotor position through sine and cosine windings. A thermistor is embedded inside the stator winding to monitor the temperature rise of the copper wire in real time. Temperature sensors are used to identify overload in magnetic bearing mechanisms, protect bearings from abnormal contact, and detect lubrication failure. The real-time controller is used to precisely control the electromagnetic torque of the motor through the machine-side converter according to the upper-level instructions, so as to achieve constant power charging and discharging of the flywheel, compare the actual speed with the safety threshold in real time, linearly reduce the charging power when it approaches the upper limit, and force the switch to standby or discharge mode when the upper limit is reached. The grid-connected coordination controller is used to receive wind power smoothing target values ​​or frequency regulation dispatch commands and convert them into flywheel charging and discharging power set values; The inertial response control unit is used to simulate the motion equation of the synchronous generator rotor, so that the flywheel exhibits inertia and damping characteristics.

6. The flywheel energy storage inertial regulation system for wind power stabilization according to claim 2, characterized in that: The auxiliary system includes: The cooling mechanism is used to remove the heat generated by the copper and iron losses of the motor and keep the winding temperature below the insulation class limit. The heat dissipation mechanism is used to ensure the insulation and magnetic properties of the magnetic bearing mechanism coil and maintain its stable operating temperature.

7. The flywheel energy storage inertial regulation system for stabilizing wind power according to claim 1, characterized in that: The configuration system includes: Grid connection interface, used to match the grid voltage level; An energy management system is used to optimize charging and discharging strategies.

8. The flywheel energy storage inertial regulation system for stabilizing wind power according to claim 7, characterized in that: The grid connection interface includes: A grid-connected transformer is used to raise the output voltage of a flywheel converter to the grid voltage level to meet grid connection voltage requirements. The disconnecting switch creates a clear disconnect point during inspection or maintenance, ensuring electrical isolation between the flywheel side and the power grid side and protecting the safety of maintenance personnel. Grounding switches are used to reliably ground the flywheel side circuit after the equipment is shut down for maintenance, to release residual charge and prevent induced voltage from injuring people; LCL filters are used to suppress harmonic currents generated by high-frequency switching of converters from being injected into the power grid. The static var generator supplements reactive power to maintain stable grid connection voltage when the flywheel converter is running at full power and the remaining capacity is insufficient.

9. A flywheel energy storage inertial regulation system for stabilizing wind power according to claim 7, characterized in that: The energy management system includes: The industrial control server is used to run energy management algorithms and databases, and to handle multi-source data fusion, strategy optimization and command issuance. The charging and discharging strategy optimization engine is used to output the optimal charging and discharging power curve in real time based on flywheel SOC constraints, grid dispatch instructions and electricity price signals, and equipment health status and lifespan loss. The mode manager is used to automatically switch the flywheel operating mode according to grid demand and wind power status; The power quality decomposer is used to decompose the total power command calculated by the EMS into the individual power settings of each flywheel unit, and then send them to the local controller of each flywheel via the communication link.

10. A flywheel energy storage inertial regulation system for stabilizing wind power according to claim 1, characterized in that: It also includes an emergency stop system, which is used to trigger hard-wired interlocking logic in abnormal operating conditions such as overspeed, overtemperature, and vacuum failure, automatically cut off the main power supply and start the backup power supply to maintain the levitation of the magnetic bearing mechanism, and ensure that the system enters the preset safe state.

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