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低开关频率下SVPWM同步调制策略比较研究

DOI: 10.13334/j.0258-8013.pcsee.2015.16.021, PP. 4175-4183

Keywords: 大功率牵引传动系统,低开关频率,空间矢量脉宽调制,同步调制,多模式调制

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Abstract:

在大功率牵引传动系统中,由于受到开关损耗和散热条件等的限制,逆变器最高开关频率通常比较低,一般只有几百赫兹,此时为了提高系统的输出特性,通常采用多模式调制策略。该文对空间矢量脉宽调制(spacevectorpulsewidthmodulation,SVPWM)脉冲生成规律进行了归纳和总结,介绍了5种满足半波奇对称、四分之一周期偶对称和三相对称要求的SVPWM同步调制策略。通过对比分析5种调制方法的谐波特性,提出了一套适用于大功率牵引传动系统低开关频率条件下的多模式SVPWM调制策略,并分析了不同调制模式之间的切换原则。通过仿真和实验结果,验证了多模式调制策略的正确性和可行性,实现了不同调制模式之间的平滑切换。

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