摘要
最近电平逼近是模块化多电平逆变器(MMC)常用的调制方法之一,当模块数偏少,或者调制电压过低时,输出电流会产生畸变.从原理上分析了MMC输出电流谐波畸变产生的原因,然后提出了一种抑制MMC输出电流谐波的控制方法.该方法对输出电流进行分频提取后通过PI调节器得到反相谐波电压,最后将反相谐波电压叠加到调制电压上获得总的参考电压.所提出的方法简单可行,易于实现.仿真分析和实验结果表明,采用本文所提出的方法,模块化多电平变流器输出电流的畸变得到较好的抑制.
Nearest level modulation is a common modulation method for Modular Multilevel Converters （MMC）. As the number of modules is few or the modulation voltage is low, the output current is distort- ed. Firstly, this paper theoretically analyzes the reason why the harmonic of output current is distorted in MMC, and then proposes a control method to suppress the harmonics. The method extracts the harmonics of output current, and through a proportional integral regulator, the negative harmonic voltages is ob- tained. Lastly, the harmonic voltages are added to the modulation reference voltage. The purpose of this method is to obtain the total reference voltage. The proposed method is simple, feasible, and easy to im- plement. The simulation and experimental results show that the distortion of the output current of MMC is suppressed by the proposed method.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第2期80-87,共8页
Journal of Hunan University:Natural Sciences
基金
湖南省科技计划项目(2015GK3012)~~
关键词
谐波抑制
稳压控制
最近电平逼近
模块化多电平变流器
广义积分器
harmonics suppression
voltage control
nearest level modulation
modular multilevel con- verter
generalized intergrator
作者简介
通讯联系人，荣飞（1978-），男，湖北仙桃人，湖南大学副教授，博士E-mail：rf_hunu@126．com
