三相电压源型PWM逆变器相电流重构策略研究

基于直流电流、开关状态及三相电流之间的关系，提出用直流电流和开关状态重构逆变器相电流的新方法．歼关状态由改进型电流滞环数字控制器产生．为减小测量噪声和重构相电流误差，设计了IIR（Infinite Impulse Response）数字滤波器．以感应电机矢量控制系统为例进行了仿真研究，结果表明新方法是有效的、准确的．该方法仅需一个直流电流传感器，降低了电机驱动系统成本，提高了系统的容错能力．该方法与电机模型参数及负载变化无关，适用于所有三相平衡电流的交流电机驱动系统．

Reconstruction Strategies for Phase Currents in Three Phase Voltage-Source PWM Inverters

Based on the relationship among DC-link current, switching states and three phase current, a new method using DC-link current and switching states is proposed to reconstruct all inverter phase currents. The generation of switching states is based on the improved current hysteresis-band digital controller. The IIR (Infinite Impulse Response) digital filter is designed to reduce the measurement noise and the errors from reconstructing the phase currents. The simulation results obtained from a vector-controlled induction motor are used to show the effectiveness and accuracy of the new method. Within the scheme, only one DC-link current sensor is used, which reduces the cost and enhances the fault-tolerance performance of the drive system. The proposed algorithm is independent of the motor model parameters and the load applied; therefore, it can be applied to any 3-phase motor drive systems operating under balanced phase current regulation.