无交流电流传感器PWM整流器电流重构

摘要

Due to the omission of AC current sensors,the AC current needs to be reconstructed through a certain algorithm in the control strategy without AC current sensor.The current reconstruction usually is based on space vector pulse width modulation(SVPWM),and the problem of this scheme is that the reconstructed current waveform appears distortion near the sector switch area.A novel current reconstruction processing strategy which combines coordinate transformation and low pass filtering(LPF) is proposed,in which the reconstructed current is carried out coordinate conversion and low pass filtering.This reconstruction strategy can solve the problem of reconstruction current distortion,simplify the control system.The simulation and experimental resuits verify the correctness of the current reconstruction strategy.%由于省去了三相交流电流传感器,所以PWM整流器的无交流电流传感器控制必须采用一定算法对交流电流进行重构.一般是基于空间矢量脉宽调制(SVPWM)算法,该方案存在的问题是在扇区切换处附近重构电流会发生波形畸变.针对该问题提出一种基于坐标变换和一阶低通滤波的重构处理策略,将重构电流进行坐标变换和低通滤波,解决了无交流电流传感器控制重构电流的波形畸变问题,简化了控制系统.仿真和实验结果验证了电流重构处理策略的正确性.