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超稀疏矩阵变换器窄脉冲抑制

, PP. 247-252

Keywords: 超稀疏矩阵变换器,空间矢量调制,窄脉冲抑制,非线性畸变

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Abstract:

受开关器件性能的限制,超稀疏矩阵变换器(UltraSparseMatrixConverter,USMC)传统空间矢量调制策略中含有大量窄脉冲,从而引起输出波形发生非线性畸变。针对这种情况,本文分析了窄脉冲产生的原因,通过对传统调制策略进行改进,提出了一种窄脉冲抑制策略。该策略通过比较整流级各矢量占空比的大小,重新排列各矢量的工作顺序,避免了有效矢量的丢失;同时,在逆变级调制中适当插入零矢量来增大脉冲宽度,进而减少了窄脉冲的数量。该策略不仅有效抑制了窄脉冲引起的波形畸变,优化了USMC的输入-输出性能,而且简单易实现,无需增加额外硬件。实验结果证明了所提方案的可行性和有效性。

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