58 results about "Pi regulator" patented technology

The invention relates to the technical field of servo control, in particular to a high-precision current closed-loop control system and method for a servo driver, and the method comprises the steps: collecting three-phase current, rotor position, winding temperature and bus voltage, and constructing a state data set; constructing a parameter identification model fusing physical prior and an attention mechanism, deducing inductance and flux linkage parameters influenced by temperature, saturation and cross coupling, and correcting a motor model in real time; the correction parameters are injected into an FOC decoupling and feedforward link, and a self-adaptive PI regulator is linked to set the gain of a current loop on line; calculating a d-q axis voltage command according to the update model to respectively control excitation and torque components; an extended state observer is introduced to estimate load abrupt change and parameter disturbance, feed-forward compensation is carried out, and three-phase PWM is generated through anti-Parker and SVPWM; and an inverter nonlinear compensation model of a dead zone and switch delay is constructed, PWM is pre-distorted and output to a power device, and robust and low-ripple current closed-loop control of the servo motor is realized.

The invention discloses a specific grid-connected current harmonic suppression method and device for an energy storage converter, and belongs to the technical field of power systems, and the method comprises the steps: obtaining a given current value of a fundamental current loop, and carrying out the dq / abc conversion to obtain a three-phase current reference value; acquiring a three-phase current value of a power grid side, and subtracting the three-phase current value from the three-phase current reference value to obtain a harmonic current value; converting the harmonic current value to a target subharmonic synchronous rotating coordinate system to obtain a target subharmonic current value; extracting the target sub-harmonic current value in a direct current form through a low-pass filter, and sending the target sub-harmonic current value to a PI regulator for regulation to obtain a harmonic voltage compensation amount; and injecting the harmonic voltage compensation amount into a modulation wave to realize suppression of the target subharmonic current. According to the invention, the grid-connected side current harmonic of the energy storage converter can be effectively suppressed, and the grid-side current quality is improved.

The invention discloses a network construction type converter pre-synchronization control method based on Taylor compensation, and the method comprises the steps: collecting the three-phase voltage of an output end of a virtual synchronous generator (VSG) and the three-phase voltage of a power grid side, carrying out the Clark transformation, and extracting a positive sequence voltage component; on the basis of the positive sequence voltage component, calculating a phase difference sine value of the VSG output voltage and the power grid voltage; based on the phase difference sine value, compensating the phase difference sine value through Taylor expansion to obtain a compensated real-time phase difference; and fusing the compensated real-time phase difference into a VSG phase-locked loop-free pre-synchronization control strategy, and driving a PI regulator to dynamically correct the output frequency and phase of the VSG. A phase-locked loop is completely abandoned, and the frequency oscillation risk is eliminated; expanding a phase difference calculation range through third-order Taylor compensation; voltage vector analysis and a dynamic compensation function are fused, phase synchronization is achieved, and grid-connected impact current is reduced.

The invention relates to the technical field of motor control, and discloses a vector control application of a direct drive motor, which comprises the following steps: S1, collecting stator current, rotor speed and bus voltage signals of the motor, and carrying out filtering preprocessing on the collected signals; and S2, constructing a self-adaptive flux linkage observation model, estimating a stator flux linkage in real time based on stator current and bus voltage signals in combination with rotor rotating speed information, and correcting stator resistance and inductance parameters through a model reference self-adaptive algorithm. According to the method, the motor parameters are corrected in real time through the self-adaptive flux linkage observation model, parameter drift caused by factors such as temperature change and magnetic saturation is effectively counteracted, and the accuracy of flux linkage estimation is improved; the improved PI regulator realizes online self-tuning of control parameters through a fuzzy control algorithm, can quickly adapt to changes of dynamic characteristics of the motor, and shortens the regulation response time of flux linkage and torque; and the resistance of the system to external interferences such as load fluctuation, power supply voltage change and the like is enhanced.

The invention discloses a permanent magnet synchronous motor wide speed range model prediction control method and system based on a mean value reduction optimization algorithm, and belongs to the technical field of motor control. According to the method, a discrete mathematical model of the permanent magnet synchronous motor is established under a d-q rotating coordinate system, a q-axis current reference value is generated by an outer ring through a speed PI regulator, and a d-axis current reference value is calculated in combination with a maximum torque per ampere (MTPA) principle and a weak magnetic region voltage constraint; finite control set model prediction control is adopted in an inner ring, enumeration prediction is conducted on candidate voltage vectors of the three-phase voltage source type inverter, a cost function containing a d-axis current error, a q-axis current error and an electromagnetic torque error is constructed, an optimal voltage vector is selected, and a three-phase PWM signal is generated through space vector pulse width modulation to drive a motor. The system is provided with a mean value reduction optimization module, joint optimization is carried out on speed outer ring PI parameters and cost function weight coefficients in the off-line stage, the parameters are stored in a lookup table, and automatic setting of control parameters is achieved. The permanent magnet synchronous motor can improve the dynamic response performance of the rotating speed and the current in the base speed area and the weak magnetic area, reduce the total harmonic distortion of the stator current, improve the voltage utilization rate and the overall operation efficiency of the permanent magnet synchronous motor, and is suitable for occasions such as electric vehicle driving and high-performance servo systems.

The application relates to a kind of linear vernier permanent magnet motor deadbeat control methods, on the basis of traditional DTC control, by introducing speed backstepping controller to replace traditional speed loop PI regulator, using deadbeat controller to replace current loop PI regulator, using improved double-sampling double-update SVPWM to replace traditional SVPWM modulation module.According to multiple simulation, the application can effectively reduce the overshoot of the system and effectively reduce the thrust ripple of the system on the basis of maintaining traditional DTC control, and improve the dynamic performance of the system.

The application discloses a kind of control circuit and method of server standby power supply, including main power drive unit, analog PI regulator, current sampling conditioning circuit and OringFET tube;Main power MOS tube realizes main loop on-off control, and triode is used to change the gate voltage of main power MOS tube to control its conduction, cut-off;Analog PI regulator is composed of reference source and operational amplifier, reference source provides accurate reference voltage, and operational amplifier compares and adjusts current detection signal with reference voltage, dynamically corrects the control level signal of output, and then controls the on-off of main power MOS tube through driving circuit;Current sampling conditioning circuit includes sampling resistance and differential amplifier, and real-time acquisition main loop current is converted into identifiable voltage signal, to provide accurate data support for analog PI regulator.The application is applied when server is in shutdown state, and can be remotely executed by network to start, restart, install operating system or monitor hardware health state and the like operation.

The invention discloses a PI regulator with a leakage compensation function and a null drift suppression method thereof.According to the PI regulator, a leakage observer and a leakage PI compensator are embedded in a classic PI regulator, the leakage observer executes a real-time leakage flow estimation algorithm and inputs the estimated real-time leakage flow into the leakage PI compensator, and the leakage PI compensator and the leakage observer are connected in sequence. The leakage PI compensator calculates leakage compensation current according to the real-time leakage flow and inputs the leakage compensation current into the adder, the adder adds the output control signal and the leakage compensation current to obtain a control current instruction, and the control current instruction is input into the servo amplifier and controls displacement of the oil cylinder through the servo valve. According to the method, a leakage observer and a leakage PI compensator are used for calculating leakage flow and leakage compensation current, saturation judgment and current amplitude limiting are executed, and corresponding leakage compensation current is output. According to the PI regulator and the zero drift suppression method thereof, oil cylinder position drift is greatly reduced, zero return overshoot is completely eradicated, manual calibration is canceled, one-time calibration is effective for a long time, and the equipment cost is reduced.

The invention discloses an ultrasonic motor driving control strategy based on voltage amplitude-frequency hardware decoupling. Phase voltage, phase current and rotation angle signals of a motor are sampled through a sensor and an encoder, a voltage and current phase difference is obtained by adopting a zero crossing point detection method, resonant frequency is obtained by combining a PID frequency regulator, and independent frequency control is realized by matching with a fixed duty ratio; the rotating speed is obtained through differential operation, reference voltage is obtained through a PI regulator, and independent amplitude control is achieved by combining a voltage amplitude obtained through a rectification average value method with a PID voltage regulator and matching with a fixed frequency. The two-stage circuit topology is adopted to independently regulate and control the voltage amplitude and the voltage frequency, the problems that voltage amplitude regulation is nonlinear and voltage frequency regulation is coupled in a traditional ultrasonic motor driving scheme are solved, the voltage amplitude is independently regulated at the front stage, the voltage frequency is independently regulated at the rear stage, hardware decoupling of the voltage amplitude and the voltage frequency is achieved, and the system reliability is improved. The harmonic content of the output voltage of the driving circuit is lower, and the voltage control is more linear.

The application relates to a rolling mill calendering roller flattening force control method, characterized by the following specific steps: step S1, hardware improvement: angle encoders are installed on the swing arm pivot fulcrums of the driving side and the operating side of the rolling mill calendering roller, swing arm angles of the driving side and the operating side are collected in real time, step S2, mathematical model construction: a model is established based on the swing arm angle data, and step S3, PI closed loop control; the application compares the actual force (T dact , T Oact measured by a pressure sensor) of the hydraulic cylinder with the given force (T dref , T Oref ), calculates the deviation (Delta T d , Delta T O ), dynamically adjusts the input current of the proportional valve of the hydraulic cylinder on the two sides through a PI regulator, compensates the deviation in real time, ensures that the flattening forces (F d , F O ) on the two sides are consistent, and thus the unbalance of the forces on the two sides caused by mechanical wear and installation errors can be eliminated, and defects such as one-side waves and layering can be inhibited.

The application discloses a hybrid energy storage system energy management method and system, and relates to the technical field of energy storage system energy management. The method comprises the following steps: collecting output currents of each energy storage converter and estimating physical link impedance values of each converter branch to a DC bus; constructing a physical link decoupling term and superimposing the physical link decoupling term into a droop control model to generate a preliminary voltage reference value; collecting output voltages of each energy storage converter after physical link decoupling, inputting the output voltages into a PI regulator respectively after being subtracted from a set DC bus voltage reference value, calculating a battery-side virtual voltage source compensation term and a super capacitor-side virtual voltage source compensation term, and performing second correction on the preliminary voltage reference value to obtain a final output voltage reference value; and sending the final output voltage reference value into a voltage-current double closed loop controller for modulation to generate a PWM driving signal, so as to control actions of each energy storage converter. The method eliminates high-frequency fluctuation components of the bus voltage under high-frequency and severe fluctuation of the load, and ensures stability of the bus voltage.

The application discloses a three-phase grid-connected converter control method, a circuit, a device and a medium, and relates to the technical field of AC-DC power distribution systems. The three-phase grid-connected converter control method provided by the application establishes a mathematical model of the three-phase grid-connected converter, combines the causes and suppression mechanism of the leakage current, controls the filter capacitor voltage in the zero sequence loop to be a constant value through a PI regulator, and effectively attenuates the leakage current. The phase angle of the grid voltage is obtained in a three-phase stationary coordinate system, the sampling quantity is coordinate-transformed according to the angle, a modulation signal is obtained, and the power switch tube in the grid-connected converter is controlled according to the modulation signal. Since only one connected wire needs to be added between the middle point of the filter capacitor and the common point of the lower bridge arm in the scheme, the cost is low, and the leakage current caused by the existence of the parasitic capacitance of the DC side power distribution device to the ground can be limited to the microampere level.

The application discloses a single-phase control system and method based on d-q rotating coordinate transformation, adopts a double-loop architecture of a voltage outer loop and a current inner loop, the voltage outer loop filters a sampling voltage through a second-order generalized integrator, obtains d-q axis voltage components through Park transformation, and generates a d-axis current reference value by using a PI regulator; the current inner loop also filters and transforms the sampling current, inputs a current error into a PI regulator to obtain a current compensation component, eliminates the coupling influence between d-q axes through decoupling operation, and finally generates a duty cycle signal for driving an inverter through inverse coordinate transformation. Through the double-loop cooperative control and decoupling algorithm, the application realizes high-precision voltage stabilization of the inverter output voltage and fast dynamic response of the current, effectively suppresses harmonics and load disturbance, and improves the output power quality.

The invention discloses a multi-machine control method and equipment based on a high-frequency ripple adjustable electrolytic hydrogen production test power supply, and relates to the field of electrolytic hydrogen production power supply control. Based on a single-closed-loop direct load current control strategy, feedback control is performed on the load current of the test power supply, and a current error is calculated; filtering and adjusting the current error by using a notch filter and a PI regulator, and calculating to obtain an intermediate voltage through a multi-machine proportionality coefficient module; the intermediate voltage is input to a PWM adjusting circuit to generate a driving pulse; and carrying out multi-machine control on the multi-machine parallel Boost conversion circuit in a wide working condition range by using a driving pulse. The high-precision output of the broadband adjustable high-frequency ripple current for the electrolytic hydrogen production load test is realized, the resonance peak is effectively suppressed, the nonlinearity is weakened and the linear working interval is widened through the single closed-loop direct current control and virtual impedance strategy, and the extra loss is avoided while the precision of a multi-machine parallel system is ensured.

The invention provides a self-adaptive damping control method of a bidirectional direct-current converter under a load throwing working condition, and relates to the field of power electronics, and the method comprises the steps: building a bidirectional direct-current converter system, collecting circuit data for initialization, and setting a starting mode; in the mode, a strategy of combining soft start with PI control is adopted, the duty ratio is calculated through a reference voltage slope and a PI regulator, and a PWM module generates four paths of driving signals to control the on and off of a full-bridge MOS tube; in the control process, analyzing system working conditions according to collected circuit data, and switching to a steady-state mode when a load throwing working condition occurs; in the mode, a composite duty ratio control law is constructed by using an LADRC linear active disturbance rejection control strategy, a complementary PWM signal is generated after amplitude limiting processing, and the system is driven to recover energy. Through mode switching and LADRC linear active disturbance rejection control, voltage oscillation under load throwing disturbance is effectively suppressed, and the dynamic stability and the voltage stabilization precision of the system are improved.

This invention belongs to the field of power electronics technology, specifically relating to an automatic IGBT voltage drop compensation method for a three-phase inverter. First, the upper and lower arms of one phase of the three-phase inverter are turned off, the upper arm of another phase is turned off and the lower arm is turned on, while the upper and lower arms of the third phase remain operational. This constructs the three-phase inverter as a DC-DC converter topology. A microcontroller segments the current and rate of the PI regulator, changing the carrier frequency of the PWM module's voltage. The voltage drop of the IGBTs under different given currents and carrier frequencies is calculated using voltage equations. This enables automatic identification and compensation of the IGBT voltage drop in the three-phase inverter, as well as closed-loop control of the inverter's output current. This automatic voltage drop compensation method effectively solves the problem of inaccurate compensation for IGBT voltage drops caused by load current variations, thereby improving inverter output current distortion and significantly enhancing inverter performance.

This invention provides a DC-DC control method for new energy locomotives, comprising: acquiring the input current signals of each DC-DC converter unit, the SOC value of each power battery, and the output bus voltage acquisition value; constructing a dual closed-loop control structure of voltage outer loop and current inner loop; wherein, the voltage outer loop takes the deviation between the preset target value of the bus voltage and the acquisition value as input, and generates a total current command through an active disturbance rejection controller (ADRC); determines the target value of each current inner loop based on each SOC value and the total current command, so that the SOC of each battery tends to be consistent; the current inner loop takes the deviation between the target value of the current inner loop and the corresponding input current acquisition value as input, and generates a modulation wave signal through a PI regulator; performs amplitude limiting processing on the modulation wave signal; compares the amplitude-limited modulation wave signal with a triangular carrier wave to generate a drive pulse, and controls the operation of the power switch.

This invention discloses a fault-tolerant control method for a two-phase four-switch permanent magnet synchronous motor based on MPC. After an inverter switch failure, this method connects the motor neutral point to the DC power supply midpoint and reconfigures the inverter into a two-phase four-switch fault-tolerant operating topology using the remaining switches. The control system adopts a dual-loop structure. The outer loop controls the motor speed through a PI regulator and provides torque and flux linkage reference values ​​to the inner loop based on the maximum torque-to-current ratio. The inner loop employs model predictive direct torque control, using the stator voltage equation and stator current prediction model to obtain predicted flux linkage and torque values. The optimal switching state of the inverter is obtained using a value function, and the remaining switches are controlled to achieve fault-tolerant operation of the motor after a switch failure. This invention enables stable system operation even after a switch failure without requiring control strategy switching, effectively improving the safety and reliability of permanent magnet synchronous motor operation.

The invention discloses a synchronous phase modifier and STATCOM multi-target coordination optimization control method in an HVDC system. The method comprises the following steps: establishing a synchronous phase modifier reactive power regulation system based on SNA-PID; the deviation of the alternating current bus voltage of the inverter station is used as an input quantity, and the ITAE, the maximum absolute error value and the minimum steady-state deviation absolute value of the alternating current bus voltage of the inverter station are used as optimization targets of multi-target coordinated optimization control; and an NSGA-II multi-target optimization algorithm is adopted to carry out multi-target coordinated optimization on synchronous phase modifier reactive power regulation optimization parameters based on SNA-PID and voltage and current PI regulator control parameters of the STATCOM, so that multi-target coordinated optimization control of the synchronous phase modifier and the STATCOM in the HVDC system is realized. According to the invention, the inverter station AC bus voltage drop caused by system faults and load access can be effectively reduced, the inverter station AC bus overvoltage caused by fault elimination and load disconnection can be effectively suppressed, the recovery time of the system bus voltage is reduced, the probability of commutation failure of the system is effectively reduced, and the reliability of the system is improved. And the system stability is improved.

This invention relates to an adaptive diagnostic method for inter-turn short-circuit faults in a dual-phase three-phase permanent magnet synchronous motor, belonging to the field of motor fault diagnosis technology. By establishing a mathematical model and an adjustable model for inter-turn short-circuit faults in the dual-phase three-phase motor, and combining multi-phase motor space vector decoupling transformation, a short-circuit fault component is introduced into the harmonic subplane of the stator voltage equation. Fault characteristic values ​​are designed using the x-y current residual between the actual motor and the adjustable model. The fundamental amplitude is extracted as a fault severity feature through orthogonal Fourier transform. An observer based on the mapping relationship between the short-circuit current residual and the fault turns ratio is constructed. A model reference adaptive law for the piecewise PI regulator is used to dynamically adjust the PI parameters according to speed and load conditions, achieving adaptive feedback estimation of the short-circuit turns ratio. This improves the accuracy and real-time performance of fault feature extraction, simplifies the fault-tolerant algorithm and optimizes the disturbance observer parameter design, solves the diagnostic distortion problem caused by changes in operating conditions, and provides an optimized solution for motor monitoring.

The invention discloses a hybrid energy storage system energy management method and system, and relates to the technical field of energy storage system energy management, and the method comprises the steps: collecting the output current of each energy storage converter, and estimating the physical link impedance value from each converter branch to a DC bus; constructing a physical link decoupling item and superposing the physical link decoupling item into the droop control model to generate a preliminary voltage reference value; collecting the output voltage of each energy storage converter after the physical link is decoupled, subtracting the output voltage from a set direct current bus voltage reference value, inputting the difference to a PI regulator, and calculating to obtain a battery side virtual voltage source compensation item and a super capacitor side virtual voltage source compensation item, so as to carry out the second correction on the initial voltage reference value, and to obtain a battery side virtual voltage source compensation item and a super capacitor side virtual voltage source compensation item; obtaining a final output voltage reference value; the voltage-current double-closed-loop controller is used for modulating to generate a PWM (Pulse-Width Modulation) driving signal so as to control each energy storage converter to act; the method eliminates the high-frequency fluctuation component of the bus voltage under the high-frequency severe fluctuation of the load, and ensures the stability of the bus voltage.

The invention discloses a current control method combining field weakening control and discrete domain of a synchronous reluctance motor, which is characterized in that a PI regulator is arranged in a field weakening controller in a motor control system, a signal output by the PI regulator is used as a d-axis current instruction compensation amount, and distribution is carried out according to dq-axis current instruction tracks corresponding to different rotating speed ranges in sequence; selecting according to the current amplitude limit; smooth switching from the maximum torque current ratio to the maximum torque voltage ratio is achieved in the rotating speed increasing process through a multi-time current distribution and comparison algorithm; based on a direct discretization synchronous reluctance motor mathematical model, a reconstructed voltage and current relation is combined, and a discretization current controller containing delay compensation and dynamic decoupling is constructed; the method has the advantages that a stable and rapid current control effect can be realized under a high-speed operation condition, and the maximum torque output of the synchronous reluctance motor in a full-speed domain range is realized.

The invention provides a self-adaptive power grid voltage change converter and a control method and device thereof. The method comprises the following steps: acquiring grid-connected point voltage and active power of the grid side of the converter; according to the voltage deviation control quantity between the amplitude of the grid-connected point voltage and the voltage rated value, the value of a voltage amplitude control flag bit is updated, and the value of the voltage amplitude control flag bit is used for controlling a PI regulator with an integral output freezing function; according to the value of the voltage amplitude control flag bit, a PI regulator with an integral output freezing function is adopted to regulate the voltage deviation control quantity, and a voltage amplitude regulation control quantity is obtained; performing active power control according to the active power of the converter grid-connected point to obtain an active adjustment control quantity; determining a wave generating voltage instruction at least according to the voltage amplitude adjustment control quantity and the active adjustment control quantity; and carrying out space vector modulation on the wave sending voltage instruction to generate a driving signal required by converter control. The method provided by the invention solves the problem of contradiction between the voltage support strength of the new energy unit and the grid-connected small disturbance stability, and improves the power grid voltage support characteristics of the new energy unit.

The invention discloses a grid-side current harmonic suppression method based on a five-phase permanent magnet synchronous motor driving system, and belongs to the technical field of motor driving and control. Firstly, a five-phase permanent magnet synchronous motor and non-electrolytic capacitor driving system model is established, and LC resonance analysis is carried out; extracting grid-side characteristic sub-harmonics through a band-pass filter, generating virtual damping through a PR resonance controller, and converting the virtual damping into a shaft voltage compensation instruction; extracting a grid-side input current harmonic component in real time, and combining the grid-side input current harmonic component with the output of a rotating speed loop through a PI regulator to form a final given inverter power; the compensation power is decoupled and injected into a motor shaft voltage component, and driving control is achieved in cooperation with five-phase carrier pulse width modulation. According to the invention, the grid-side current harmonic suppression under the drive system of the five-phase permanent magnet synchronous motor without the electrolytic capacitor is realized, the size of the electrolytic capacitor is saved, no extra hardware equipment is needed to carry out bus voltage resonance suppression, and the stability under the condition that the power grid is unbalanced is improved.

The invention discloses a controllable double-rectifier-bridge power generation system topological structure of a stator generator. The controllable double-rectifier-bridge power generation system topological structure comprises a position detection module, a voltage and current sensing module, a coordinate transformation module, a controller module and a controllable rectifier bridge module. On the basis, the system firstly performs closed-loop control on the direct-current side voltage through a voltage PI regulator in a voltage outer loop according to the reference voltage and the collected direct-current side voltage; phase currents of double stators are collected, decoupling processing is carried out on the phase currents of the motor through a coordinate transformation module, and current closed-loop control is achieved through a current PI regulator; performing inverse decoupling coordinate transformation on the space voltage obtained by current control, and converting the space voltage into phase voltage; and finally, carrying out SPWM on the phase voltage to obtain a control signal of the controllable rectifier bridge module. According to the invention, the topological structure of the power generation system is improved, and the output voltage is controlled by adopting the controllable rectifier bridge, so that the system can quickly respond to the change of the running state of the generator, and the system has better dynamic performance and robustness.

The application discloses a DC bus voltage quick recovery control method for a high-voltage power supply module of an ECRH (Electron Cyclotron Resonance Heating) fusion device, and relates to the technical fields of auxiliary heating power supply and power electronic control. Specifically, the method comprises the following steps: obtaining a real-time sampling value of a DC bus voltage, a DC side current sampling value and a grid voltage d-axis component; outputting an active current reference component through a PI regulator according to a voltage deviation; generating a feedforward active current component according to a power balance relationship and superimposing the two to obtain a synthesized d-axis current instruction value as a current inner loop given value. The purpose is to lift the current instruction in advance when a load step occurs, realize quick power matching, reduce the DC bus voltage drop and shorten the recovery time.

The invention is suitable for the technical field of motor control, and provides a reinforcement learning-based bus current harmonic signal injection MTPA control method and system, and the method comprises the steps: injecting a specific high-frequency signal into a motor, and extracting an MTPA indication factor deviation; constructing a five-dimensional state vector including MTPA indicator factor deviation, d-q axis current, motor speed and historical error integral; outputting an action vector by adopting a double-delay depth deterministic strategy gradient algorithm; the action is fed back to a controller to realize parameter online optimization; and closed-loop control is formed to realize accurate MTPA control. The system comprises a signal injection module, a harmonic extraction module, a state observation module, a reinforcement learning decision module, a PI regulator and a current control module. According to the method, the dependence on a high-resolution sensor is avoided, the algorithm complexity is reduced, and the adaptive capacity and the operation efficiency of the system to parameter time varying are improved.

The invention discloses a frequency domain decoupling power distribution droop control method and device, equipment and a medium. The method comprises the following steps: generating virtual impedance through a virtual resistor and a virtual capacitor; generating a power distribution transfer function based on the virtual impedance; by adjusting the parameters of the virtual resistor and the virtual capacitor, the cut-off frequency of the power distribution transfer function is set to be omegac = 1 / (Rv.Cv) for distinguishing high-frequency and low-frequency power fluctuations; the power distribution transfer function is embedded into a hierarchical control architecture, the hierarchical control architecture sequentially comprises current inner loop control and voltage outer loop control, and the current inner loop control quickly responds to reference current through a PI regulator and suppresses transient oscillation caused by power fluctuation; and the voltage outer loop control generates a reference current value based on the DC bus voltage deviation so as to maintain the voltage stability.

The invention discloses a phase lock control system and method for improving grid-connected transient stability of a wind turbine generator, and the system comprises a simplified model building module which is used for building a reduced-order model of a grid-connected inverter system; the amplitude limiting control module is connected to the output end of the phase-locked loop PI regulator and used for limiting the frequency change rate according to the system stability boundary value so that the frequency change rate does not exceed the stable operation boundary. The low-pass filtering negative feedback module is connected to the output end of the amplitude limiting control module and is used for filtering the frequency signal and feeding back the frequency signal to the input end of the PI regulator so as to improve the damping coefficient of the system and enhance the stability and the anti-interference capability of the system; and the phase-locked loop dynamic model building module is used for building an improved phase-locked loop dynamic model based on the simplified model building module, the amplitude limiting control module and the low-pass filtering negative feedback module. According to the method, the synchronization stability of the new energy grid-connected inverter in a transient event can be effectively improved, and the defects of insufficient dynamic response and anti-interference performance of a traditional phase-locked loop technology are overcome.