低频率工况下模块化多电平变流器电容电压平衡控制策略

被引：23

作者：

刘国伟

姜齐荣

魏应冬

机构：

[1] 清华大学电机工程与应用电子技术系

来源：

电工技术学报 | 2014年 / 29卷 / 08期

关键词：

高压变频; 模块化多电平变流器; 低频率工况; 载波移相调制; 电容电压均衡控制;

D O I：

10.19595/j.cnki.1000-6753.tces.2014.08.021

中图分类号：

TM46 [变流器];

学科分类号：

摘要：

针对应用于高压变频的模块化多电平变流器(MMC)在低频率工况下会出现子模块电容电压波动较大的问题,该文对电容电压波动机理及其抑制控制方法进行了研究。首先,根据MMC的工作原理,设计载波移相调制方法;其次,从理论上分析子模块电容电压波动机理,并在此基础上提出一种适合于低频率工况的电压平衡控制策略;最后,通过仿真验证了控制策略的正确性与有效性。该控制策略可以降低各子模块开关频率,在低频率工况下对子模块电容电压波动有良好的抑制效果。

引用

页码：166 / 172

页数：7

共 11 条

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