88 results about "Stator voltage" patented technology

The invention discloses a permanent magnet synchronous motor gradient three-parameter identification dead-beat current prediction method, which comprises the steps of reconstructing a motor stator voltage and current equation based on an initial motor parameter estimation value in a controller; injecting a periodic high-frequency excitation signal on the d-axis current reference value to construct a continuous excitation condition required by parameter identification; establishing a parameter identification model based on inductance, resistance and flux linkage based on the current prediction error of the d axis and the q axis, and updating a parameter estimation value in the controller by adopting a gradient descent method according to the model; a convergence step size value range is determined based on Lyapunov stability analysis, and global convergence and system stability in a gradient iteration process are ensured. According to the method, the problem of motor parameter disturbance is effectively solved, and the stability, dynamic responsiveness and robustness of a motor control system are remarkably improved under the condition that other complex hardware is not added.

The application provides a method for observing rotor flux of an alternating current motor, and belongs to the technical field of motor control. The method comprises the following steps: calculating rotor observation flux based on a first voltage-type flux calculation model and stator voltage and stator current in a two-phase static coordinate system; obtaining an amplitude deviation by subtracting the amplitude of the rotor rated flux from the amplitude of the rotor observation flux, and obtaining a deviation compensation quantity by multiplying the amplitude deviation by a proportional integral operation; and compensating and correcting the first voltage-type flux calculation model based on the deviation compensation quantity to obtain a voltage-type flux calculation model with compensation correction, so that the amplitude of the rotor observation flux converges. The application converges the rotor observation flux to the rotor given flux by connecting a correction link based on the traditional voltage-type flux calculation model, and finally realizes accurate flux position observation.

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 present application relates to the field of power system control and power electronic energy storage technology, in particular to a generator set transient power compensation system and method thereof, the method comprising: collecting stator voltage, stator current, rotor angular velocity, power angle and DC bus voltage, and mapping into a generalized state vector; constructing a port-controlled Hamilton system model containing an initial interconnection matrix and an initial damping matrix based on preset physical parameters and obtaining a Hamilton energy function; taking partial derivative of the Hamilton energy function with respect to the generalized state vector, calculating an energy gradient vector, dynamically reconstructing a virtual interconnection matrix and a virtual damping matrix, analyzing control input and converting into a duty cycle command to send to an energy storage converter to perform transient power compensation; the system comprises a data acquisition module, a Hamilton energy controller and an energy storage converter; faster transient recovery, lower mechanical stress and more stable closed-loop response can be achieved.

This application discloses a current loop control method, related devices, and a permanent magnet synchronous motor (PMSM), relating to the field of motor control. By feeding forward a disturbance voltage characterizing the voltage change caused by parameter variations in the PMSM, an ideal stator current equation is obtained. The transfer function of the PMSM is obtained by combining the vector expressions of stator voltage and stator current in an orthogonal coordinate system. The first current loop transfer function is determined by combining the first controller transfer function. The coefficient values ​​of each control element are determined by tuning the first current loop transfer function. Then, based on the obtained second controller transfer function and the compensation term for the current loop delay, a control voltage calculation model corresponding to the target coordinate axis is determined. The first control voltage is determined based on the control voltage calculation model and fused with the disturbance voltage to obtain the final control voltage. This achieves high-precision current decoupling control of the PMSM, improving control accuracy and efficiency.

This invention provides a control method for a doubly-fed induction generator (DFIG) wind turbine with DC-side energy storage grid construction based on hybrid synchronization, belonging to the field of wind power generation and energy storage control technology. This control method calculates and generates modulation voltage commands through a rotor current inner-loop controller based on sampled stator voltage values ​​and reference values, enabling grid-connected operation of the rotor-side converter. Based on the grid-side converter current commands and sampled current values, a switching signal is calculated and generated through a grid-side current inner-loop controller, enabling the grid-side converter to control the voltage across the capacitor. Based on the DC-side battery current commands and energy storage inductor current, the DC-side energy storage bidirectional DC-DC converter is driven through calculation and modulation, achieving active support of the grid frequency by the DC-side energy storage system. This invention achieves inertia support and primary frequency regulation capability, ensuring stable operation of the DFIG wind turbine under weak grid conditions while also improving its grid support capability.

System and method for sensorless control of an induction motor are disclosed. A flux observer estimates a rotor flux based on stator voltage and current measurement. A low frequency signal injection module generates a flux estimation error signal at low motor speed, while a baseline observer generates a model based flux estimation error signal at medium to high motor speed. A switching mechanism selects between these error signal based on motor condition. A proportional integral regulator and integrator process the selected error signal to estimate rotor speed. A lead compensator adjusts phase during transitions to ensure stability, with a switching signal generator activating the LFSI module when stator frequency falls below a predefined threshold. This control system provides rotor flux and speed estimation across a full range of motor speed by adaptively switching between observers based on operating conditions.

This invention relates to the field of motor control technology and discloses a LADRC permanent magnet synchronous motor control system and method based on superspiral sliding mode. The system includes: a motor control inverter system for receiving the dq-axis stator voltage components and generating three-phase current signals for the permanent magnet synchronous motor; a current acquisition subsystem for receiving the three-phase current signals and generating dq-axis stator current components through Clark transformation and Park transformation; a first speed loop controller for designing an adaptive bandwidth function and introducing a superspiral sliding mode algorithm based on the target and actual speeds of the motor, generating corrected q-axis stator current components by performing error correction on the control system; a second current loop controller for performing q-axis PI control to obtain the q-axis stator voltage components; and a third current loop controller for performing d-axis PI control to obtain the d-axis stator voltage components. This invention effectively reduces chattering in the control system and improves the anti-interference capability and control performance of the control system under different operating conditions.

The embodiment of the invention provides a rotor position determination method and device of a synchronous reluctance motor, equipment and a medium. The method comprises the following steps: acquiring stator data at the current moment; wherein the stator data comprises stator voltage and stator current; based on an equivalent transmission line model, according to the stator data at the current moment and the incident voltage at the previous moment, determining the back electromotive force at the current moment; wherein the equivalent transmission line model represents a physical model for enabling stator inductance to be equivalent to a short-circuit transmission line, the equivalent transmission line model is used for determining back electromotive force, the back electromotive force represents the magnetic resistance characteristic of a rotor of the synchronous reluctance motor, and the incident voltage represents the initial state of voltage waves propagating in the short-circuit transmission line; determining rotor position information at the current moment according to the back electromotive force at the current moment; wherein the rotor position information comprises a rotor electrical angle and a rotor electrical angular velocity. The method is used for achieving the effect of improving the adaptability and precision of determining the rotor position of the synchronous reluctance motor.

The application discloses a permanent magnet synchronous motor decoupling control method and device, equipment and storage medium, wherein a d-axis disturbance value, a q-axis disturbance value, a preset resistance value, a preset d-axis inductance and a preset q-axis inductance are input into a permanent magnet synchronous motor stator voltage equation to obtain a d-axis and q-axis current change rate equation; a d-axis controlled function and a q-axis controlled function are obtained according to the d-axis current change rate equation, the q-axis current change rate equation, a d-axis control function and a q-axis control function; a closed-loop transfer function is obtained according to a d-axis adjustment function, a q-axis adjustment function, the d-axis controlled function and the q-axis controlled function; and the permanent magnet synchronous motor is controlled according to the closed-loop transfer function. In the application, the closed-loop transfer function is represented by determined parameters, so that when the environment changes, the controller parameters do not need to be reset, and the decoupling efficiency is improved.

The invention relates to the field of motor control, and provides a rotating speed control method and system for a brushless direct current motor. The method comprises the following steps: acquiring a rotating speed given value, and performing voltage conversion on the rotating speed given value through an open-loop conversion coefficient to obtain an open-loop stator voltage instruction; motor operation parameters are collected and rotation speed conversion is carried out to obtain a rotation speed feedback value; performing noise suppression processing on the rotating speed feedback value to obtain a filtered rotating speed signal; performing compensation adjustment operation according to the rotating speed given value and the filtering rotating speed signal to obtain an initial compensation signal; a compensation amplitude limiting threshold value is determined according to the rotating speed given value, amplitude constraint is carried out on the initial compensation signal, and a compensation stator voltage instruction is obtained; and carrying out superposition operation on the open-loop stator voltage instruction and the compensation stator voltage instruction to obtain a final stator voltage instruction so as to carry out modulation output control on the motor. According to the invention, on the premise of ensuring the rotating speed steady-state control performance, the dynamic response capability of motor rotating speed control is improved.

The invention relates to a permanent magnet synchronous motor model prediction control method and system, belongs to the technical field of permanent magnet synchronous motor driving, and solves the problem that parameter robustness and dynamic performance cannot be considered when parameter mismatch occurs in permanent magnet synchronous motor model prediction control in the prior art. Comprising the steps of obtaining sampling values of stator current, stator voltage and electrical angular velocity at a current sampling moment and two previous moments and a direct current bus voltage at the current sampling moment, further updating incremental current prediction errors and time sequence sampling data of incremental voltage, and further obtaining a first sample vector and a second sample vector at the current sampling moment; and then a small-batch stochastic gradient descent method is adopted to obtain an identification value of a parameter mismatch coefficient at the current sampling moment, then stator current prediction values of different voltage vectors at the next moment are obtained, then an optimal voltage vector is obtained, and permanent magnet synchronous motor model prediction control at the next moment is carried out based on the optimal voltage vector.

The present invention relates to a method for determining parameters for adjusting an electric drive (1), wherein the electric drive (1) has at least one motor (2). To improve the starting of the electric drive, a current indication is applied as a signal at the three-phase winding terminals (U, V, W) of the motor (2), wherein the d-component and q-component of the stator voltage and stator current are measured at the winding terminals (U, V, W), wherein in a first measurement step (11), a rotating current indication is applied to the three-phase winding terminals (U, V, W) and the motor (2) is oriented such that the excitation current on the q-axis is minimized, wherein in a second measurement step, the excitation winding (7) of the motor (2) is short-circuited while the rotor of the motor (2) is stationary and a current indication is applied to the winding terminals (U, V, W) in the form of a binary noise signal, wherein the stator impedance (Zd) is determined as a first adjustment parameter from the measured values. The invention also relates to an adjustment device (4) for the electric drive (1), wherein the adjustment device (4) is configured to perform this method.

This invention discloses a dynamic speed control system based on the speed feedback of a permanent magnet synchronous motor, relating to the field of motor speed control technology. It includes: a data acquisition module for acquiring three-phase stator current data, raw physical speed feedback data, and stator voltage command data of the motor, and inputting the stator voltage command data into a preset motor mathematical model to obtain model-estimated speed data; and a real-time deviation calculation module for calculating the real-time deviation divergence between the raw physical speed feedback data and the model-estimated speed data, obtaining residual fluctuation based on the three-phase stator current data, and mapping the real-time deviation divergence and residual fluctuation to obtain a dynamic feedback reliability factor. Its beneficial effects include reducing the fluctuation of the speed loop output torque current, extending the mechanical life of the motor, and improving the overall energy efficiency stability of the system.

The invention discloses a locked-rotor detection method and device of a motor, equipment and a medium, and relates to the technical field of motor control. The current rotating speed value of the motor is determined based on the three-phase current value and the stator voltage value of the motor and the observer, the current rotating speed value is obtained through calculation of the observer, hardware setting corresponding to sampling of a rotor position sensor and high-precision current does not need to be adopted, device cost is saved, and structural complexity is simplified. The current rotating speed value serves as the motor feedback speed, motor speed closed-loop control is conducted, in order to eliminate rotating speed deviation and continuously output the maximum control signal, the state of the motor rotating speed is further adjusted by increasing the output quantity, and the situation that the target rotating speed suddenly jumps drastically and slowly approaches the final value is avoided. Under the condition that the continuous saturation state is output, the current rotating speed value is compared with the locked-rotor detection threshold value, dynamic fluctuation and random disturbance of the load are flexibly adapted, and the detection accuracy is improved.

The invention relates to the technical field of open-winding permanent magnet synchronous motor torque ripple suppression, in particular to an open-winding surface-mounted permanent magnet synchronous motor zero-sequence torque suppression method and device, and the method comprises the steps: building a zero-sequence current prediction mathematical model in a zero-sequence loop of a target open-winding permanent magnet synchronous motor; determining a data driving calculation expression of a zero-sequence voltage disturbance unknown polynomial and a data dimension of a variable time window of the data driving calculation expression according to the zero-sequence current prediction mathematical model so as to update historical data of a stator voltage and stator current data register domain in a motor driving control chip under a dq0 synchronous rotating coordinate system; and calculating an estimated value of a voltage unknown disturbance polynomial in the zero-sequence loop in the current acquisition period based on the updated data so as to calculate a zero-sequence current predicted value of the next period and further calculate an injection current reference value of the next sampling period. Therefore, the problems that the zero-sequence current suppression capability of a related suppression strategy is limited, the zero-sequence current observation precision is reduced and the like are solved.

The present application belongs to the technical field of motor drive control, and particularly relates to an induction motor stator and rotor resistance estimation method and system based on a hybrid model. By real-time acquisition of stator voltage and stator current, a stator voltage equation is constructed, a corrected stator flux linkage is obtained, and a rotor flux linkage reference value is calculated, thereby providing a reference for subsequent model optimization. By constructing a hybrid model architecture of a rotor flux linkage adjustable model and a stator current adjustable model, and introducing a multi-modal attention mechanism to dynamically adjust model parameters, the adaptability and estimation accuracy of the model are improved, thereby enabling high-precision back-propagation estimation of rotor resistance and stator resistance, effectively improving the performance and reliability of the induction motor control system, and providing support for stable operation and accurate control of the induction motor.

The application discloses a washing machine motor operation control method and system based on fundamental wave voltage control, and relates to the technical field of washing machine motor control. The method comprises the following steps: S1, offline calculation of a relationship curve between the fundamental wave voltage and the reference voltage in the over-modulation region and storage of the curve in the memory; S2, calculation of the fundamental wave voltage by using a field-oriented control algorithm, wherein the d-axis and q-axis components of the fundamental wave voltage and the stator voltage are obtained through a speed loop and a current loop; S3, if the fundamental wave voltage is in the linear modulation region or exceeds the over-modulation region, an SVPWM algorithm in a 120-degree coordinate system is used for modulation; if the fundamental wave voltage is in the over-modulation region, an over-modulation algorithm in the 120-degree coordinate system is used to calculate the three-phase voltage action time, and finally, the SVPWM algorithm is used for modulation. The application directly takes the fundamental wave voltage as a control target, avoids the uncertainty caused by the inconsistency between the reference voltage and the fundamental wave voltage, and thus realizes accurate control of the fundamental wave voltage which has an actual effect.

The invention relates to a permanent magnet synchronous motor control method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring stator voltage and stator current from the permanent magnet synchronous motor to the current moment, identifying a parameter vector of a data driving model which is trained for the permanent magnet synchronous motor in advance by utilizing each stator voltage and each stator current, and determining the current moment of the permanent magnet synchronous motor on the basis of the identified parameter vector and the data driving model. And obtaining a current prediction model for the permanent magnet synchronous motor, inputting the stator voltage and the stator current at the current moment into the current prediction model to obtain a predicted stator current at the future moment, and obtaining the predicted stator current at the future moment according to the predicted stator current at the future moment, the stator current at the current moment, the identified parameter vector and a preset objective function. And obtaining a target voltage vector at the future moment, and controlling the permanent magnet synchronous motor based on the target voltage vector at the future moment. By adopting the method, the prediction accuracy of the prediction model is improved, and the control accuracy of the permanent magnet synchronous motor is further improved.

The application provides a permanent magnet synchronous motor system deadbeat prediction current harmonic tracking error compensation method, a continuous time state space voltage equation of a permanent magnet synchronous motor is constructed based on a stator voltage equation of the permanent magnet synchronous motor, a current prediction value expression is obtained through solving and merging of free components and forced components of a current analytical solution, a calculation expression of a control quantity is obtained through current reference value replacement based on the current prediction value expression, a current following error expression is obtained based on the calculation expression of the control quantity and the current prediction value expression under consideration of filtering errors, parameter mismatch and control quantity action deviation, fundamental wave control quantity and harmonic control quantity are calculated respectively by using the current prediction value expression, the calculation expression of the control quantity and the current following error expression, and the fundamental wave control quantity and the harmonic control quantity are fused as final control quantity of the permanent magnet synchronous motor. The application improves low harmonic current tracking precision.

The invention discloses a sliding mode speed control method for a permanent magnet synchronous motor, and belongs to the technical field related to control. The method comprises the following steps: establishing a disturbance-containing permanent magnet synchronous motor mathematical model based on a stator voltage equation, an electromagnetic torque equation and a mechanical motion equation of the permanent magnet synchronous motor; designing a non-singular fast integral terminal sliding mode surface to avoid singularity and reduce buffeting phenomena; a variable function gain term and a sliding mode surface power term are introduced on the basis of a traditional exponential reaching law to improve the reaching law; designing a permanent magnet synchronous motor sliding mode speed controller based on the improved reaching law and the sliding mode surface; and designing an improved non-singular fast terminal sliding mode disturbance observer, and introducing the improved reaching law into the non-singular fast terminal sliding mode disturbance observer. According to the technical scheme, the rotating speed control response speed of the permanent magnet synchronous motor is improved, buffeting of the system is restrained, and the robustness of the system is enhanced.

The application discloses a kind of permanent magnet synchronous motor prediction control methods based on cross optimization, it is related to motor control field, specific method is, the stator flux, stator current and electromagnetic torque prediction equation of permanent magnet synchronous motor discrete model are established;In each control cycle, the torque and flux linkage corresponding to all stator voltage vectors in inverter respectively are predicted, the normalized torque error and normalized flux linkage error corresponding to all stator voltage vectors respectively are calculated, each normalized torque error, flux linkage error is arranged in ascending order respectively, and the first 50% stator voltage vector of sorting is selected as flux linkage and torque optimal set respectively;Then the cross error in each optimal set is calculated, and finally the stator voltage vector with minimum cross error is selected as the optimal voltage vector.

The invention relates to a robust dead-beat model prediction method for a permanent magnet synchronous motor, which relates to the field of motor control and comprises the following steps of: sampling stator current and stator voltage of the permanent magnet synchronous motor, and outputting the stator current and the stator voltage to an MRAS observer; the MRAS observer calculates a rotating speed estimation value and a resistance estimation value according to the obtained parameters; a dead-beat prediction controller is adopted to receive corresponding parameters of the motor and parameters output by the MRAS observer, and an ideal voltage vector is calculated in each sampling period and is output to a discrete space vector modulation module; and a standardized triangular area where the ideal voltage vector is located is determined through processing of the discrete space vector modulation module, three vertex vectors of the standardized triangular area are used as candidate voltage vectors respectively, and an optimal control vector is selected to be output to the inverter. The method has the advantages of high efficiency, low pulse output and small calculation amount, can realize high-precision voltage prediction and control under the condition of parameter uncertainty, and improves the robustness.

A kind of cross-axis voltage-regulating flux-weakening control method: motor information is collected, three-phase current of output side is converted into d-q axis current, obtains electric angular velocity, d-q axis voltage is solved, obtains 6-way pulse signal for controlling the switching of power device in static frequency converter using space vector modulation strategy;According to voltage, current limit circle formula, the amplitude of stator current and stator voltage and d-q axis current given value is limited;Generate q-axis voltage given value;Q-axis flux-weakening control error is analyzed;The cross-axis voltage equation of surface-mounted permanent magnet synchronous motor is used as cross-axis circuit model;Design cross-axis flux-weakening controller;Introduce current loop first-order inertia link, obtain equivalent flux-weakening controller;The reference tracking performance of q-axis voltage is analyzed, and the control speed of q-axis voltage is realized by adjusting the size of cross-axis flux-weakening loop bandwidth.The flux-weakening controller parameter setting of the present application is simple, voltage amplitude fluctuation is small, system stability is strong, and flux-weakening loop bandwidth can be adjusted very conveniently.

According to the self-learning control method and system for voltage regulation and speed regulation of the crane, the triggering angle is obtained through the PID controller according to the speed instruction of a current user and the real-time motor rotating speed under the speed instruction; meanwhile, according to a speed instruction of a current user, the real-time motor rotating speed, the real-time stator current and the real-time stator voltage, a self-learning triggering angle is obtained; and an optimized triggering angle is obtained by combining the triggering angle, and the silicon controlled rectifier driving module is controlled, so that the crane is controlled. The silicon controlled rectifier driving module is controlled by optimizing the triggering angle, the risk caused by the abnormal rotating speed of the motor to the system can be avoided, and meanwhile, through data accumulation in a preset database, the stability and reliability of control over the crane can be further improved, the anti-interference capability is high, and the control precision is high. And factory unmanned operation of a voltage regulation and debugging technical route can be realized.

The application relates to the technical field of motor control, and discloses a permanent magnet synchronous motor position sensorless control method, which comprises the following steps: constructing an extended back electromotive force disturbance observer and a dynamic error disturbance observer; based on a stator voltage instruction value and a stator current actual value, an extended back electromotive force estimation value is calculated by using the extended back electromotive force disturbance observer; an initial rotating speed estimation value is determined based on the extended back electromotive force estimation value; based on the extended back electromotive force estimation value, a dynamic error disturbance estimation value is calculated by using the dynamic error disturbance observer, and a rotating speed compensation amount is obtained based on the dynamic error disturbance estimation value; the initial rotating speed estimation value is dynamically error compensated by using the rotating speed compensation amount, a rotating speed estimation value is obtained, and a rotor position information estimation value is calculated based on the rotating speed estimation value; and the permanent magnet synchronous motor is vector controlled by using the rotor position information estimation value. The application improves the dynamic performance of the built-in permanent magnet synchronous motor position sensorless control.

The invention provides a motor observer parameter adaptive tuning method and related equipment, and relates to the technical field of electric digital data processing. The method comprises the following steps: firstly, constructing a PI parameter mathematical model to provide a basis for subsequent calculation; core parameters such as motor inductance, real-time current, stator voltage and target rotating speed are obtained, and it is ensured that the calculation basis fits the actual state of the motor; then, on the basis of the core parameters, reactive power of the motor is calculated through a PI parameter mathematical model, and the rotating speed and a voltage correction instruction are estimated; adjusting the running state of the motor according to the voltage correction instruction; and the adjustment step is repeated until the absolute value of the reactive power is smaller than a preset reactive power deviation threshold value and the deviation between the estimated rotating speed and the target rotating speed is smaller than a preset rotating speed deviation threshold value, and self-adaptive adjustment and optimization of the motor observer parameters are completed. According to the method, the problem that traditional curing parameters cannot adapt to dynamic changes of the motor is avoided, and the matching degree of the observer parameters and the actual running state of the motor is remarkably improved.

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.

This utility model discloses a voltage sampling interface protection device for a doubly-fed induction generator (DFIG) converter in a wind turbine generator set, relating to the field of wind power equipment technology. It includes a fusible link fuse, a DC bus voltage sampling interface, a capacitor voltage sampling interface, a stator voltage sampling interface, and cables. It also includes a DIN rail bracket. The fusible link fuse is fixedly installed in the external terminal box of the DFIG converter control box via the DIN rail bracket. Three sets of fusible link fuses are connected in series on the voltage divider circuit side at the front end of the DC bus voltage sampling interface, the capacitor voltage sampling interface, and the stator voltage sampling interface, respectively. A protective component is installed at the cable through-hole. This device features an optimized structure, with the addition of fusible link fuses to enhance the protection characteristics of the converter grid-side voltage sampling interface, quickly cutting off short-circuit current and preventing fault propagation. The cable through-hole uses a special protective sleeve to prevent cable damage due to vibration or external force. The modular design of the fuse via the DIN rail and bracket simplifies the fuse replacement process and facilitates maintenance.