一种新型的多电平逆变器空间矢量控制方法

A Novel Space Vector PWM Control Technique for Multilevel Inverters

基于传统的两电平逆变器空间电压矢量方法,提出了一种新型的多电平逆变器空间电压矢量实现方法,该方法将一相的逆变单元分为基本单元和调制单元两部分,相应地对参考电压也要进行分解处理。在一个脉宽调制(PWM)周期中,只对调制单元进行PWM控制,基本单元输出的电平不变。仿真研究表明该方法输出电压波形总畸变率较小,可用于单元串联多电平逆变器的控制。

Based on the conventional space vector PWM technique for two-level inverters, a novel space vector PWM implementation technique for multilevel inverters is proposed. The cascaded inverters of each phase are divided into two parts: modulation inverters and fundamental inverters, and the reference voltages and the reference vector are also decomposed. Only the modulation inverters can be modulated in the PWM cycle, while the fundamental inverters output the fixed level. Simulation results show that lower THD of output voltage can be reached using the technique and the technique is suitable for the control of cascaded multilevel inverters.