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多机T型三电平光伏并网逆变器的环流抑制

DOI: 10.13334/j.0258-8013.pcsee.2014.01.005, PP. 40-49

Keywords: T型三电平,并联,光伏并网逆变器,零序环流

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Abstract:

针对多机T型三电平光伏并网逆变器的零序环流问题,在分析零序环流环路的基础上,建立零序环流的等效模型,并根据激励源的不同将零序环流分成3类:通态零序环流、开关零序环流和混合零序环流。提出一种共享中线的并联方案抑制通态零序环流,一种基于改进型LCL滤波器的并联方案抑制开关零序环流的高频分量。采用一种基于零序环流调节因子的控制方案抑制开关零序环流的低频分量,并确定调节因子的限幅范围,最后论证上述方案对混合零序环流抑制的有效性。搭建10kW的多机三电平光伏并网逆变器样机,实验结果证明了零序环流模型分析和抑制方法的正确性。

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