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一种可靠换流的双级矩阵变换器载波调制策略

, PP. 184-191

Keywords: 双级矩阵变换器,载波调制,简化换流,可靠性,窄脉冲

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Abstract:

为了提高双级矩阵变换器(TSMC)换流可靠性,提出了一种新的基于载波的调制策略。整流级采用双调制波来延长整流级零电流换流时间,解决了因窄脉冲导致换流失败和输入电流畸变的问题。逆变级采用60#x000b0;开关钳位的调制函数作为调制波,减少了逆变级1/3倍的换流次数。协同调制时,整流级在相邻两个载波周期内以等腰三角波作为载波,逆变级在每个载波周期内以梯形波作为载波,保证载波周期过渡前后开关状态一致,分别消除了整流级和逆变级在载波周期过渡时的换流过程,进一步提高换流可靠性。分析了整流级最小换流时间与逆变级调制系数之间的关系。最后,建立TSMC实验样机,与现有的两种载波调制策略进行了对比,验证了本文策略的正确性及优越性。

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