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五相电压源逆变器的空间矢量脉宽调制方法研究

DOI: 10.13334/j.0258-8013.pcsee.2014.18.007, PP. 2917-2925

Keywords: 永磁同步电动机,五相电压源逆变器,空间矢量脉宽调制,谐波分析,调制系数

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Abstract:

为提高五相电压源逆变器(voltagesourceinverter,VSI)的直流母线电压利用率,减少输出相电压中所含的谐波分量,提出一种改进的基于最近四矢量的五相VSI空间矢量脉宽调制算法。根据调制系数的不同,将整个调制范围分为正弦调制区和非正弦调制区。在正弦调制区,通过合理分配空间矢量的作用时间,使得输出相电压为标准正弦波形,不含有任何谐波成分;在非正弦调制区,通过对谐波子空间内的电压矢量进行优化控制,在进一步提高直流母线电压利用率的同时,保证输出相电压中所含谐波分量更少,使逆变器工作在最优状态。仿真和实验结果验证了所提算法的正确性和可行性。

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