摘要
降低和消除共模电压及共模干扰,在高压大功率电力电子变换器中具有重要意义。本文以一个三电平NPC变频器驱动的交流电机系统为研究对象,使用消除三次谐波式的特定谐波消除脉宽调制即SHEPWM(Selected Harmonics Elimination PWM)技术,从源头上消除变频器输出共模电压中的低频分量。而对所剩的高频部分共模谐波,使用共模滤波器进行滤除。定性和定量分析了差模滤波器参数不对称对共模电压的影响。实验证实了本文方案实用高效。
Common mode （CM） voltage and its related interference have become prominent in high power converters. This paper aims to reduce the CM voltage of an induction motor driven by a three level （3L） NPC converter using the combination of both algorithm modification and hardware modification. The tripling frequency-eliminating SHEPWM （Selected Harmonics Elimination PWM） technique has been utilized to eliminate the low order 3-times harmonics of the converter. And then the rest of the CM voltage is attenuated by a well-designed CM filter. A detailed analysis of the effect of the differential mode inductance imbalance on CM voltage is given. Both experimental and simulation results show that a very low CM voltage at the motor terminal is obtained, which verify the validity of the scheme proposed in this paper.
出处
《电工电能新技术》
CSCD
北大核心
2008年第3期31-34,67,共5页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金重点资助项目(50737002)
作者简介
钟玉林（1973-），男，安徽籍，博士生，主要从事电力电子装置与系统的电磁兼容应用研究；
赵争鸣（1959-），男，湖南籍，教授，博导，博士，主要从事电力电子与电机系统的应用研究。
