级联型多电平逆变器的优化脉冲宽度调制控制策略  

Improved Pulse Width Modulation Control Strategy for Cascade Multilevel Inverter

作　　者：张航辉[1] 郑宏[1] 朱保华[1] 陈灵奎[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《低压电器》2010年第24期32-34,共3页Low Voltage Apparatus

基　　金：江苏省科技攻关计划项目(BE2007069);江苏省研究生培养创新工程项目(CH07B-102z)

摘　　要：基于传统分析消谐波脉冲宽度调制PWM法(Subharmonic PWM,SHP-WM),提出了一种适用于三相级联多电平逆变器的改进型调制方法,即载波重叠开关频率优化PWM法(CO-SFO-PWM)。新型PWM方法兼具载波重叠法和开关频率优化法的优点,可以增大输出线电压的基波幅值,提高直流电源电压利用率,改善输出线电压谐波性能,特别是在低调制下可明显减少输出线电压畸变率。以三相级联型7电平逆变器为例,通过Matlab进行仿真验证,有效地验证了CO-SFO-PWM调制方法的正确性。Based on traditional SHPWM method,an improved modulation method applying to three-phase cascade multilevel inverter system was proposed.The new method was called carrier overlapping switch frequency optional pulse width modulation（CO-SFO-PWM）,which combined the advantages of CO-PWM and SFO-PWM.The fundamental amplitude of the output line voltage was increased,so the utilization ratio of DC voltage was increased,the output line voltage had a better harmonic characteristics,especially could significantly improve the distortion ratio of output line voltage at low modulation.Matlab simulation results based on three-phase seven-level inverter demonstrated the effectiveness of the new method.

关 键 词：级联型逆变器 多电平 谐波特性 电压利用率 

分 类 号：TM464[电气工程—电器]