163results about "Generator control circuits" patented technology

The invention discloses a method for suppressing subsynchronous oscillation of a doubly-fed grid-connected system, and relates to the technical field of stability control of a power system, and the method comprises the specific steps: S100, extracting the amplitude and phase angle of a subsynchronous frequency component, S200, generating a rotor compensation current instruction according to the amplitude and phase angle of the subsynchronous frequency component and a dynamic gain, and S200, generating a rotor compensation current instruction according to the rotor compensation current instruction; s300, dynamically adjusting the gain according to the suppression ratio and the amplitude of the target magnetic field during operation, S400, calculating the feed-forward decoupling voltage, S500, calculating the suppression ratio after injection, and executing a hierarchical control strategy. Subsynchronous oscillation suppression from the electromagnetic essential level is realized, and by monitoring the subsynchronous component of the air-gap magnetic field in real time and injecting the anti-phase compensation current at the rotor side, the suppression efficiency of the subsynchronous oscillation is improved. Active interference of a stator magnetic field and a rotor magnetic field in a subsynchronous frequency band is cancelled, an energy transfer path of subsynchronous oscillation is directly blocked, oscillation forming conditions are destroyed, and a dynamic gain adjustment mechanism optimizes compensation intensity according to a real-time suppression effect so as to cope with 5-45Hz subsynchronous oscillation frequency change.

The present application relates to the technical field of wind power generation, and discloses a control method and apparatus for a grid-forming doubly-fed wind turbine generator, a generator, and a medium. In embodiments of the present application, a current reference value of a grid connection point is determined on the basis of measurement parameters of the grid connection point in combination with an internal potential parameter of a grid-forming doubly-fed wind turbine generator and a virtual impedance reference value, a voltage reference value of a grid-side converter is further determined on the basis of the current reference value of the grid connection point, and the grid-side converter is modulated on the basis of the voltage reference value, thereby implementing closed-loop control of the grid-side converter, such that a difference between an output voltage value and the voltage reference value of the grid-side converter is less than a preset threshold.

The present disclosure discloses a method for controlling coordinated operation of multiple wind generators to avoid secondary frequency drop. The method includes the following steps: first, the Doubly Fed Induction Generator (DFIG) required for frequency support is dynamically selected based on a real-time disturbance power of a power grid and the rotating speed level of each DFIG; second, the virtual inertial control parameters are adaptively regulated according to the system frequency and the change in the rotating speed of the DFIG participating in frequency support, ensuring that the frequency support requirements are satisfied; and finally, the remaining DFIGs are controlled to release the rotor kinetic energy to support the rotating speed recovery of the selected DFIG, so as to reduce the extra energy absorbed from the power grid in the process.

The invention discloses a wind power plant equivalent virtual inertia identification method based on symbol regression, and relates to the technical field of novel power system frequency safety and stability, and the method comprises the steps: S1, building a doubly-fed fan inertia response dynamic mechanism model containing comprehensive inertia control; according to the method, the problems of lack of physical mechanisms, poor evaluation interpretability and the like of an equivalent virtual inertia evaluation method for a current wind power plant are solved, the method is based on system operation data and is associated with an inertia response dynamic mechanism model, and the interpretability of a system physical process is reserved; a sparse dynamic modeling method is adopted, an input-output linear combination feature library of system electromagnetic torque-rotor rotating speed change is constructed, sparse solution of parameters is achieved through a sequence threshold value least square algorithm, and the equivalent virtual inertia of the wind power plant is obtained through evaluation. According to the method, model priori knowledge and operation data are fully applied, and the evaluation result is high in accuracy and high in interpretability.

The invention belongs to the field of brushless doubly-fed motor control, and particularly discloses a low-bus-capacitor brushless doubly-fed direct-current power generation system direct-current voltage ripple suppression device which comprises a brushless doubly-fed direct-current power generation system, a machine-side converter control system and a direct-current voltage ripple suppression control system. The machine-side converter control system is connected with the machine-side converter and is used for controlling the direct-current bus voltage and suppressing harmonic voltage of a first target number of times of the direct-current bus voltage by adopting a control winding harmonic current compensation method; the direct current voltage ripple suppression control system is connected with the direct current bus and is used for separating harmonic voltage of a first target number of times of the direct current bus voltage and obtaining a harmonic current reference value of a second target number of times of the control winding; the active suppression of the direct-current bus voltage ripple is realized by integrating the harmonic voltage and the harmonic current reference value of the direct-current bus voltage. According to the invention, the system power density is ensured, and the electric energy quality is improved.

The invention provides a zero-voltage ride-through control method for a self-synchronizing voltage source doubly-fed wind turbine generator, which comprises the following steps that: when the self-synchronizing voltage source doubly-fed wind turbine generator is in a transient state, a grid-side converter adopts vector control, and a rotor-side converter adopts additional virtual impedance and annular current limiting; the transient overcurrent of the grid-side converter and the rotor-side converter can be effectively suppressed, so that the continuous operation capability of the wind turbine generator in the zero-voltage ride-through period can be maintained; meanwhile, by improving the transient capacity and the transient reactive current amplitude of the converter, the transient voltage supporting capacity of the wind turbine generator during the zero voltage ride-through period can be effectively provided; when the self-synchronizing voltage source doubly-fed wind turbine generator set is in a transient state, overvoltage of direct-current bus voltage is limited by a Chopper circuit, active-priority current amplitude limiting control is adopted by a grid-side converter, parameters of a current inner ring PI controller of a rotor-side converter are optimized, energy balance of a direct-current side can be achieved in the zero-voltage ride-through period, and stability of the direct-current bus voltage is maintained.

A method of controlling the operation of a doubly fed induction machine is provided. The DFIM includes a stator electrically coupled to a power grid and a rotor rotating with a rotational speed. The DFIM has a synchronous rotational speed of the rotor and a rated rotational speed of the rotor. Rotation of the rotor at the synchronous rotational speed generates one or more slot harmonic distortions having a harmonic order. The method comprises operating the DFIM at the rated rotational speed of the rotor, wherein the rated rotational speed of the rotor is set to a value selected such that a shift of the harmonic order of one or more of the slot harmonic distortions at the rated rotational speed of the rotor is an integer number or is within a predefined limit of an integer number.

The invention discloses a double-fed fan low voltage ride through cooperative control method based on power prediction, and belongs to the technical field of wind power generation. The method comprises the following steps: inputting data; performing power prediction based on a CNN-LSTM (Convolution and Long Short Term Memory Neural Network); converter capacity dynamic distribution calculation; the invention relates to an improved direct power control strategy design. According to the method, the CNN-LSTM power prediction model is introduced, so that the problems that traditional direct power control depends on real-time power feedback, a control instruction lags, and consequently, the voltage of a direct-current bus is unstable and reactive power support is delayed during low-voltage ride-through are solved. Through the predicted active power curve, the capacity distribution strategy of the converter is adjusted in advance, so that the reactive power support response is accelerated. Through the adaptive hysteresis control technology, the switching frequency is reduced in the low-voltage ride-through period to protect the device, so that the low-voltage ride-through operation capability of the doubly-fed fan is improved.

The invention relates to a doubly-fed variable-speed pumped storage unit comprehensive inertia supporting method, device and equipment based on an excitation capacitor. The method comprises the following steps: acquiring a frequency deviation value and a frequency deviation change rate of a grid-connected point after a load connected with a power system is suddenly changed; determining whether to start a comprehensive inertia control strategy according to the frequency deviation value and the frequency deviation change rate; if the comprehensive inertia control strategy is started, dynamically adjusting a DC bus voltage reference value according to the frequency deviation value to determine a d-axis modulation voltage component; acquiring additional electromagnetic increment power; controlling a grid-side converter in the power system to operate according to the d-axis modulation voltage component, controlling a machine-side converter in the power system to operate according to the additional electromagnetic increment power, and providing inertial current impact support for the power system; and if the comprehensive inertia control strategy is not started, the frequency of the power system is kept stable and synchronous, and the doubly-fed variable-speed pumped storage unit of the power system is controlled to work in a constant power state.

The invention discloses a current compensation type three-vector model prediction control method for an off-grid doubly-fed wind turbine generator, belongs to the technical field of doubly-fed wind turbine generator control, and aims to solve the problems of voltage sag and high total harmonic distortion rate of a micro-grid system caused by sudden load change during off-grid operation of the doubly-fed wind turbine generator. The control method comprises the steps that on the basis of virtual synchronous networking control, an off-grid doubly-fed wind turbine generator rotor current prediction model is established, load current, stator side converter current and stator voltage are introduced into three-vector model prediction control, and the voltage coupling effect and current change caused by load abrupt change are compensated in real time, so that the rotor current of the off-grid doubly-fed wind turbine generator is predicted. Obtaining a compensated rotor current reference; a cost function is designed by taking the minimum prediction error of the rotor current as a target, so that accurate prediction of the rotor current during sudden load change is realized, a voltage sag phenomenon caused by sudden load change is effectively inhibited, the harmonic content of output voltage is reduced, and meanwhile, quick response to system frequency and load power is realized.

The invention discloses an AC excitation system no-load voltage buildup and pre-synchronization grid-connected control method and system, and the method comprises the steps: obtaining the amplitude and phase of a power grid voltage in real time through a phase-locked loop when the rotating speed of a doubly-fed induction motor reaches a synchronous rotating speed range; detecting the mechanical position of the rotor by using an encoder and calculating a slip angle; carrying out fundamental component extraction and phase correction on the stator side no-load voltage; setting a stator voltage target value based on power grid voltage directional control and calculating target rotor current; constructing a rotor current inner loop control loop, calculating a feedforward decoupling item and performing phase compensation; superposing a stator voltage outer loop control loop, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator side no-load voltage and the power grid voltage; and when a preset synchronization condition is satisfied, closing the grid-connected circuit breaker and switching a control mode. Accurate no-load voltage buildup and smooth pre-synchronization grid connection of the excitation system are achieved through a double closed-loop control structure, and the stability and reliability of the grid connection process are improved.

A DFIG wind power facility configured to be operated during grid faults is provided. The wind power facility includes a Doubly-Fed Induction Generator, a control system, an electric converter, a short-circuit controlled switch to selectively short-circuit the stator and a Stator Neutral Brake Chopper coupled to the stator. The DFIG includes a rotor and a stator, the stator including at least one three-phase winding. The electric converter includes a Machine Side Converter, a Grid Side Converter and a DC link connected therebetween. The SNBC includes a three-phase rectifier including three inputs, an impedance and an active high-frequency switch configured to vary the average value of the impedance by adjusting its duty cycle; each of the three inputs of the rectifier is connected to a phase of the at least one three-phase winding of the stator. Methods for operating a DFIG wind power facility during grid faults are also provided.

The invention relates to a stable control method and a stable control system for accessing a network construction type heterogeneous power supply to a direct current system, belongs to the technical field of power system control, and solves the problem of serious active power vacancy when an alternating current tie line of an existing multi-source access direct current sending end system fails. The method comprises the steps that energy flow paths among subsystems in the system are analyzed to identify key control links causing instability of the system and orthogonal interaction energy of the key control links, and the orthogonal interaction energy is an interaction energy item which has the largest influence on the stability of the system in interaction energy among modules of the subsystems; based on a minimization principle of total stored energy of the system, coordinating and adjusting a doubly-fed fan active instruction, a direct current system current instruction and an energy storage active instruction in real time; keeping a negative value according to the total interaction energy of the system to compensate the orthogonal interaction energy among the subsystems; and according to the state feedback signal, the active power instruction of each subsystem is dynamically adjusted in combination with the control switching logic. The adaptive capacity and the dynamic recovery performance are improved, and accurate matching and quick response to various fault working conditions are achieved.

The present invention belongs to the field of new energy power generation equipment, and in particular relates to a control method, system and storage medium for a doubly-fed wind turbine generator set, which obtains a real-time angular frequency deviation signal of a power grid. When the system frequency deviation is greater than a specified value, the bandwidth of a phase-locked loop is adjusted; and a final rotor d-axis current reference instruction is calculated; a reactive power reference instruction is calculated based on the q-axis current reference instruction, a reactive control link is introduced, and the rotor q-axis current reference instruction is calculated by a reactive controller; based on the new current reference signal, the doubly-fed wind turbine generator set generates a new control signal by an upper-level control loop, so that the doubly-fed wind turbine generator outputs corresponding active power and reactive power, thereby achieving rapid and active support for the power grid frequency; compared with the frequency control method implemented in the existing phase-locked loop, the method has the advantages of not requiring the introduction of a differential operator, fast frequency response, simple control structure, and no need to adjust the phase-locked loop bandwidth to a lower value, while maintaining the accuracy of the phase-locked loop phase angle tracking.

The invention provides a multi-target control method for a permanent magnet direct drive fan under an asymmetric fault of a power grid, and solves the technical problems of power fluctuation suppression and current unbalance degree reduction control target coordination optimization in fault ride-through. Comprising the following steps: S1, establishing a positive and negative sequence coordinate system model of a permanent magnet direct-driven wind turbine generator grid-side converter, and carrying out positive and negative sequence separation on voltage and current of the grid-side converter; s2, grid-side converter reference current instructions of the three control targets are calculated; s3, constructing a uniform expression form of the reference current of the grid-side converter; s4, active power fluctuation suppression and negative sequence current suppression are selected as coordinated optimization control targets for control; and S5, constructing a multi-objective optimization function, solving to obtain a current reference value of the converter, and performing current closed-loop control on the grid-side converter. The method has the advantages that multi-target coordination optimization control over the permanent magnet direct-driven wind turbine generator set under the power grid voltage fault is achieved, and the low-voltage ride-through capacity and the grid connection performance of the permanent magnet direct-driven wind turbine generator set are enhanced.

This invention discloses a method and system for no-load voltage build-up and pre-synchronization grid connection control of an AC excitation system. The method includes: acquiring the amplitude and phase of the grid voltage in real time via a phase-locked loop when the speed of the doubly-fed induction motor reaches the synchronous speed range; detecting the rotor mechanical position and calculating the slip angle using an encoder; extracting the fundamental component and correcting the phase of the stator-side no-load voltage; setting a target value for the stator voltage based on grid voltage-oriented control and calculating the target rotor current; constructing an inner-loop control loop for the rotor current, calculating the feedforward decoupling term and performing phase compensation; superimposing an outer-loop control loop for the stator voltage, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator-side no-load voltage and the grid voltage; and closing the grid connection circuit breaker and switching the control mode when the preset synchronization conditions are met. The dual-closed-loop control structure achieves precise no-load voltage build-up and smooth pre-synchronization grid connection of the excitation system, improving the stability and reliability of the grid connection process.

A method for providing grid formation control of a doubly-fed generator of a wind turbine includes receiving one or more voltage commands from an external controller via a stator voltage regulator of a converter controller. Further, the method includes determining one or more rotor current commands from a magnetizing current command and a stator current feedback signal of the doubly-fed generator via the stator voltage regulator. Accordingly, the method includes using the one or more rotor current commands to control a rotor voltage of the doubly-fed generator to achieve the one or more voltage commands.

The invention discloses a carrier synchronization control method suitable for a parallel converter of a doubly-fed wind power generation system, which belongs to the technical field of excitation converter equipment of the doubly-fed wind power generation system, and comprises the following steps: sending a square wave signal containing own carrier phase information to a bus through a synchronization signal generation circuit; generating a globally unified synchronization signal by using line AND logic; each module calculates the difference value between the own carrier phase and the reference phase according to the received synchronization signal, and compares the difference value with the average value of the carrier period adjustment quantity; if the difference value exceeds a set threshold value, a software filtering strategy is adopted for optimization; and the carrier phase of each module is dynamically adjusted through an indirect phase modulation method to realize carrier synchronization. According to the invention, carrier phase synchronization of the parallel converter of the doubly-fed wind power generation system can be realized in a power frequency period completely based on software control, a phase adjustment quantity filtering function is realized, and the reliability and the anti-interference capability of phase adjustment and the operation efficiency and the safety of the system are remarkably improved.

Systems and methods for operating a power converter are provided, the power converter having a plurality of inverter blocks, the plurality of inverter blocks having silicon carbide MOSFETs. The converter may include a plurality of inverter blocks. Each inverter block may include a plurality of switching devices. The plurality of switching devices may include one or more silicon carbide MOSFETs. The control method may include: providing, by a control system, one or more gate commands to a first inverter block of the plurality of inverter blocks. The control method may further include: implementing, by the control system, a gate command delay to generate a first delayed gate command based at least in part on the one or more gate commands. The control method may further include: providing, by the control system, the first delayed gate command to a second inverter block of the plurality of inverter blocks.

The invention discloses a method for identifying excitation inrush current and fault current of a transformer sent out by a double-fed wind power plant in the field of transformer relay protection, and aims to solve the technical problem that differential protection delays action and even refuses action. The method comprises the following steps: acquiring each phase current of a star-shaped side and each phase current of a triangular side of a transformer; converting each phase current of the star-shaped side and each phase current of the triangular side of the transformer to the same reference side, and calculating a differential current; the differential current is compared with a preset protection starting element setting value, and if the differential current is not larger than the preset protection starting element setting value, it is judged that the operation is normal or the protection starting condition is not met; and if the differential current is greater than the preset protection starting element setting value, starting an excitation inrush current and fault current identification process. According to the method, the magnetizing inrush current and the fault current can be accurately distinguished, frequency deviation interference is resisted, and the quickness and reliability of main protection of the transformer in a new energy scene are improved.

This invention relates to a method and system for analyzing fault currents and optimizing parameters in doubly-fed induction generator (DFIG) wind turbines, belonging to the field of power technology. To address the shortcomings of existing analytical formulas for DFIG fault currents, including insufficient analysis of control factors in DFIG controllers and poor practicality, this invention first establishes a mathematical model of the DFIG fault current generator (DFIG). Then, it analyzes the roles of RSC, GSC, and Crowbar protection and establishes a fault ride-through controller model. Through the derivation of the mathematical model, a detailed analytical formula for the DFIG fault current is obtained. Finally, using a differential evolution intelligent algorithm based on field-measured DFIG fault current waveforms, the analytical formula is optimized. This invention is used for fault current analysis in doubly-fed induction generator (DFIG) wind turbines.

The application provides a double-fed induction generator control system based on a data-driven estimator, comprising a power comparison unit, a PI controller, a rotor current comparison unit, a d-axis filter, a q-axis filter, a d-axis state estimator, a q-axis state estimator, a d-axis data-driven adaptive unit, a q-axis data-driven adaptive unit, a d-axis neural network unit, a q-axis neural network unit, a d-axis controller, a q-axis controller and a double-fed induction generator. The application can accurately estimate system uncertainty and environmental disturbance, adopts a topology structure of a stator side connected to a non-controlled rectification bridge, directly connects a direct current power grid in parallel, controls the motor system by controlling the rotor side inverter to regulate the excitation current, so as to realize direct power control of the double-fed motor direct current power generation system.

The invention discloses a doubly-fed fan-doubly-fed flywheel combined system and method for stabilizing wind power fluctuation, and the system enables the stator sides of a doubly-fed fan and a doubly-fed flywheel to be in grid connection and to be connected with an alternating current bus of the system, and the rotor sides of the doubly-fed fan and the doubly-fed flywheel share the same grid-side converter and then are in grid connection after passing through respective machine-side converters; according to the method, the current value of the doubly-fed flywheel stator is calculated according to the real-time current data of each joint measured by the sensor, and the doubly-fed flywheel machine side converter controls the output of the doubly-fed flywheel stator according to the current value of the doubly-fed flywheel stator. The system is simple in structure, system complexity and control difficulty are reduced, construction cost and later maintenance difficulty are reduced, power fluctuation caused by short-term wind speed change can be effectively stabilized, fluctuation is controlled within a small range, system grid-connected stability and safety are enhanced, system grid-connected point current is made to be constant, and the purpose of stabilizing wind power fluctuation is achieved. And the stability and the safety of the system are improved.

The invention discloses a position-sensorless control method and system for a doubly-fed induction wind generator, and the method comprises the steps: collecting a three-phase stator current value and a three-phase rotor current value, obtaining a stator current vector and a rotor current vector under a static coordinate system, inputting the two vectors into a phase-locked loop, and obtaining a phase-locked loop; obtaining an included angle between the stator current vector and the rotor current vector; removing the power grid voltage from the closed-loop control loop, and only taking the power grid voltage as a feed-forward item to carry out feed-forward compensation on the included angle; the voltage of the direct current bus is kept stable through the grid-side PWM converter; giving an active instruction according to the rotor speed; and the active instruction and the reactive instruction are converted into an instruction of a rotor current quadrature-direct axis component through a rotor side PWM converter so as to realize decoupling control. The method is mainly used for position-sensorless control of a DFIG wind driven generator or a similar topological structure, does not need traditional position sensor structures such as an encoder and a rotary transformer, and has better power grid fault ride-through capability and robustness.

The invention discloses a double-fed wind turbine generator network-related performance optimization method adaptive to high-power fault impact. The method comprises the following steps: step 1, constructing a multi-sequence domain model of a double-fed wind turbine generator under high-power fault impact; 2, constructing a double-layer optimization model taking the minimum de-excitation time constant as an upper layer and the minimum voltage unbalance degree as a lower layer; and step 3, solving the multi-sequence-domain model based on the double-layer optimization model to obtain rotor de-excitation and positive and negative sequence current instructions. According to the method, rotor multi-sequence domain finger current instructions can be coordinated on the premise that stress constraint is met, the unbalanced voltage suppression capability of the doubly-fed fan is remarkably improved while rapid de-excitation is considered, and a reference is provided for improving the grid-related performance of the doubly-fed fan.

The present application relates to a grid-forming power source system, a control method and apparatus therefor and a controller therefor, and a medium, and belongs to the technical field of power. The grid-forming power source system comprises: a new-energy power generation unit, which is connected to a power grid by means of a power output line; and an energy storage unit, which is connected to the power output line for the new-energy power generation unit, and is connected to the power grid after being connected in parallel with the new-energy power generation unit, wherein the energy storage unit comprises an energy storage converter, and the energy storage converter is used for controlling the magnitude of an output current of the energy storage unit, such that the total current output by the grid-forming power source system meets power grid requirements. By means of the embodiments of the present application, the safety and stability of a power system can be improved.

The present application discloses a grid-type power supply system and its control method, device, controller, and medium, which belong to the field of power technology. The grid-type power supply system includes: a new energy power generation unit, which is connected to the power grid through a power transmission line; an energy storage unit, which is connected to the power transmission line of the new energy power generation unit and connected to the power grid after being connected in parallel with the new energy power generation unit. The energy storage unit includes an energy storage converter, which is used to control the magnitude of the output current of the energy storage unit so that the total current output by the grid-type power supply system meets the needs of the power grid. According to the embodiments of the present application, the safety and stability of the power system can be improved.

The application discloses a double-fed fan subsynchronous oscillation additional damping controller based on capacitor current compensation and relates to the field of novel power system stability analysis and control; solves the problems that the existing controller is relatively complex in determining control parameters, lacks universality and operation parameters cannot be modified at will; comprises a small signal model structure based on double-fed induction fan and weak power grid grid connection, and a general phase lead compensation link controller; phase compensation controller parameters are determined through double-fed induction fan voltage and current frequency response curves; the original system control structure can be not changed, the original control parameters of the system do not need to be adjusted, direct DC current signals are obtained from the DC capacitor part of the double-fed fan, control currents are injected in the form of controlled current sources, the rotor side control and the grid side control are decoupled, and the subsynchronous oscillation phenomenon caused by the interaction between the double-fed fan phase-locked loop and the weak power grid is suppressed.

A method of detecting whether a stator distortion filter is connected to a generator of an electrical power system includes temporarily interrupting magnetic flux excitation of a generator of the electrical power system. The method also includes observing a sinusoidal waveform of one or more electrical feedbacks of the generator. Further, when the sinusoidal waveform persists longer than a predefined duration, the method includes determining that the passive load is connected to the generator of the electrical power system. When the sinusoidal waveform abruptly decays below a threshold in a time period less than the predefined duration, the method includes determining that the passive load is not connected to the generator of the electrical power system. Moreover, the method includes implementing a control action based on whether the passive load is connected to the generator of the electrical power system.

The application discloses a kind of static reactive generator and the reactive compensation method of double-fed fan cooperation, including obtaining the data information of target power system, static reactive generator and double-fed fan;It is determined and the power distribution of reactive compensation that target power system reactive compensation is carried out;According to the power distribution result, double-fed fan is preferentially mobilized, and the reactive compensation of double-fed fan is realized;According to the power distribution result, static reactive generator is called, and the reactive compensation of static reactive generator and double-fed fan cooperation is realized.The application also discloses a kind of system for realizing the reactive compensation method of static reactive generator and double-fed fan cooperation.The application sets up reactive compensation priority scheme according to the characteristics of static reactive generator and double-fed fan, and continues to correspond to the control of double-fed fan and static reactive generator, so the application not only can realize the reactive compensation of static reactive generator and double-fed fan cooperation, but also has higher reliability and better accuracy.