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多内模技术在光伏并网发电系统电流波形质量改善中的应用

DOI: 10.13334/j.0258-8013.pcsee.2014.01.003, PP. 22-31

Keywords: 并网逆变器,控制策略,多内模技术,总谐波畸变,空间矢量调制

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Abstract:

提出一种基于比例谐振控制和重复控制相结合的三相光伏并网逆变器新型控制策略。在静止坐标系下,实现交流量的无静差控制,同时有效抑制输出电流中的周期性扰动,优化输出电流波形。该方法消除了传统的旋转坐标系下dq轴电流控制路径上的耦合问题,也避免了多谐振控制策略中的相位滞后及谐振控制器之间相互影响等问题。在一台17kW光伏并网逆变器样机上进行了实验验证,实验结果表明该控制策略能够有效提高输出波形质量,实现逆变器无静差稳定运行。

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