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二极管钳位型五电平逆变器低调制比电压平衡与矢量序列的分析

, PP. 153-161

Keywords: 二极管钳位型五电平,均压,SVM调制,矢量选择与切换,窄脉冲消除

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Abstract:

二极管钳位型五电平(5L-DCC)相对三电平具有诸多优势而得到广泛关注,本文研究了5L-DCC在调制比M<0.5(简称低调制比)时的电压平衡以及矢量序列的构造与切换。分析了5L-DCC基于目标函数优化的均压策略,通过构造七段式和五段式矢量序列为基础,根据参考矢量所在三角形,提出两种矢量序列切换规则,解决了5L-DCC基于目标函数优化最近三矢量空间适量调制(SVM)均压算法矢量序列的切换及优化选择问题,并研究了窄脉冲的消除。通过仿真与实验验证表明,所提方法对电容电压平衡快速性较好且电压纹波小。

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