三相逆变器的无零矢量共模电压抑制技术研究  

Research of reduced common-mode voltage technique with nonzero vector pulse width modulation for three-phase inverters

作　　者：章勇高[1] 邝光健[1] 龙立中[1] 

机构地区：[1]华东交通大学电气与电子工程学院,江西南昌330013

出　　处：《电力系统保护与控制》2013年第2期138-143,共6页Power System Protection and Control

摘　　要：研究了三相逆变器的RSPWM、AZSPWM1、AZSPWM3和NSPWM无零矢量共模电压抑制技术。首先,分析了不同调制策略的调制因数和参考电压矢量的工作区间,说明了RSPWM的工作区间较小,适用于低调制比工作场合。再次,利用理论分析和仿真方法,研究了无零矢量调制策略的直流电压利用率和输出谐波特性,并与传统SVM调制策略比较。结果表明,AZSPWM1、AZSPWM3和NSPWM调制策略能够有效地抑制三相逆变器共模电压,同时保持了较高的直流电压利用率。但相对SVM调制策略,三相逆变器的输出谐波含量有所增大。研究结果为三相逆变器的无零矢量共模电压抑制技术的选用及进一步研究提供了理论依据和指导。The common-mode suppression techniques with nonzero vector pulse width modulation （NZPWM） for three-phase inverters are studied. They are random state pulse width modulation （RSPWM）, active zero state PWMI （AZSPWM1）, active zero state PWM3 （AZSPWM3） and near state PWM （NSPWM）. Firstly, the operation areas of modulation factor and reference voltage vector with different modulation strategies are analyzed. The results show that RSPWM has a smaller operation area than other three NZPWM and is suitable for the application with lower modulation ratio. Secondly, the DC voltage utilization rate and output harmonic of different NZPWM are researched and compared with that of traditional space vector modulation （SVM） by using theoretical analysis and simulation. The results show that AZPWM1, AZPWM3 and NSPWM can not only suppress the common mode voltage of three-phase inverters efficiently, but also maintain high DC voltage utilization rate. However, three-phase inverters with NSPWM have the higher output harmonic comparing with the traditional SVM. The research results provide theoretical basis and instruction for the selection of common mode voltage suppression technique with NZPWM for three-phase inverters and its further study.

关 键 词：三相逆变器 无零矢量脉宽调制 共模电压 直流电压利用率 谐波含量 

分 类 号：TM464[电气工程—电器]