三电平逆变器电流谐波最小PWM方法  

Minimum pulse width modulation of current harmonic for three-level inverter

作　　者：徐渊[1] 宋文祥[1] 冯九一 杨影[1] 

机构地区：[1]上海大学机电工程与自动化学院,上海200444

出　　处：《上海大学学报（自然科学版）》2017年第5期690-701,共12页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(51377102)

摘　　要：三电平逆变器在中高压大功率交流系统中的应用越来越广泛,但随着工作电压等级提高,开关损耗也随之增大.降低功率器件的开关频率可减少大容量逆变器的工作损耗,同时也会带来电流谐波畸变较大的问题,因此需要采用特殊的优化脉冲调制策略.研究了一种二极管箝位三电平逆变器(three-level neutral point clamped,3L-NPC)在低开关频率运行下的电流谐波最小脉宽调制(current harmonic minimum pulse width modulation,CHMPWM)分段同步调制方法.通过理论计算得到分段同步调制方案,采用遗传算法(genetic algorithm,GA)和序列二次规划(series quadratic programming,SQP)算法求取开关角,最后通过仿真和实验验证了理论分析的正确性及CHMPWM性能的优越性.Medium voltage transmission systems driven by a high power three-level inverter operating at low switching frequency can reduce switching losses of the power device. This paper proposes a subsection synchronous current harmonic minimum pulse width modulation （CHMPWM） approach of neutral point clamped three-level （NPC-3L） inverter in low switching frequency operation. A subsection synchronous scheme is obtained with the theoretical calculation at the allowed maximum switching frequency. Genetic al- gorithm （GA） is used to get high-precision initial values. The expected switching angles are achieved with as sequential quadratic programming （SQP） algorithm. Validity of the theoretical analysis and superiority of CHMPWM are verified via simulation and experi- ments.

关 键 词：三电平逆变器 低开关频率 电流谐波最小 

分 类 号：TM341[电气工程—电机]