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采用PI+重复控制的并网逆变器控制耦合机理及其抑制策略

DOI: 10.13334/j.0258-8013.pcsee.2014.30.004, PP. 5287-5295

Keywords: 并网逆变器,重复控制,PI+重复控制,控制耦合,零相位跟踪控制

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Abstract:

对于并网逆变器系统而言,为了抑制并网电流谐波,提高稳态控制精度,常采用重复控制。单一的重复控制动态性能差,PI+重复控制由于动态性能好、稳态精度高而被广泛应用。然而,比例积分(proportionalintegral,PI)调节器和重复控制器之间存在控制耦合,在动态过程中使并网电流发生畸变。该文分析了控制耦合机理,提出一种基于改进型重复控制的并网逆变器控制方法,一方面利用零相位跟踪控制(zerophaseerrortrackingcontrol,ZPETC)改善了系统的动态性能;另一方面通过对指令信号的动态延迟处理,抑制了控制耦合。最后通过仿真和实验表明理论分析的正确性和控制策略的有效性。

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