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三相光伏并网发电系统THD及DCI优化方法研究

, PP. 238-245

Keywords: 矢量比例积分控制器,多矢量比例积分控制器,总谐波畸变,预测算法,直流电路注入

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Abstract:

电流总谐波畸变(THD)和直流电流注入(DCI)等电能质量问题限制了光伏并网发电系统的大规模应用。提出新的减小THD及抑制DCI的方法以提高逆变器输出电流波形的质量,即将基于多个矢量比例积分(VPI)控制器并联的多矢量比例积分(MVPI)控制器应用于电流控制中以减小入网电流THD;设计一种直流分量提取电路,通过基于预测算法的控制策略达到抑制DCI的目的,同时探讨了THD和DCI二者之间的关系。在一台10kW光伏并网逆变器样机上进行了实验验证,实验结果证明了所提方法的有效性和实用性。

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