单元串联多电平逆变器PWM方法比较研究  

Comparative study of PWM techniques for cascaded multilevel inverters

作　　者：薄保中[1] 刘卫国[1] 罗兵[1] 

机构地区：[1]西北工业大学自动控制系,陕西西安710072

出　　处：《电力自动化设备》2004年第2期84-87,共4页Electric Power Automation Equipment

基　　金：国家科技攻关引导项目资助(2002BA219C)~~

摘　　要：探讨了几种现有的多电平逆变器的脉冲宽度调制PWM(PulseWidthModulation)方法,提出了一种多电平最优空间矢量方法,该方法通过选取最优空间矢量确定三相最佳电平组合,得到三相电压实际电平值,从而生成三相PWM控制模式。并与现有的PWM方法进行了比较。仿真结果说明多电平最优空间矢量方法具有开关频率低、总谐波含量低的优点。Current PWM ( Pulse Width Modulation ) techniques for multilevel inverters have been in-vestigated.A multilevel optimal space vector technique is introduced ,in which the optimal com-bination of three phase levels is determined by selecting the optimal space vector to generate the control mode of3-phase PWM.It is compared with the current PWM techniques and the simu-lation results show that the lower switching frequency and line voltage THD ( Total Harmonic Distortion) can be achieved.

关 键 词：多电平逆变器 逆变单元串联 PWM 最优空间矢量方法 

分 类 号：TM464[电气工程—电器]