三相电压源型PWM逆变器相电流重构策略研究  

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

作　　者：刘艳[1] 邵诚[1] 

机构地区：[1]大连理工大学先进控制技术研究所

出　　处：《信息与控制》2007年第4期506-513,518,共9页Information and Control

基　　金：国家科技攻关计划资助项目(2001BA204B01);教育部骨干教师计划资助项目(69825106)

摘　　要：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.开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.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.

关 键 词：PWM逆变器 电流重构 直流电流传感器 开关状态 电流滞环控制 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程]