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电网不对称时抑制负序电流并网逆变器的控制策略

, PP. 77-84

Keywords: 电网不对称,负序电流,,负序分离,瞬时功率,遗忘算法

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Abstract:

当三相电网不平衡时,传统双闭环控制策略下将在直流侧和交流侧分别产生偶数次和奇数次非特征谐波,从而严重影响并网逆变器的输出品质。针对这一问题,本文首先建立了电网不平衡时并网逆变器的数学模型,给出了同步旋转坐标下的电压矢量方程;并根据瞬时功率理论分析了功率波动形式;然后提出了一种瞬时正、负序分离方法,该算法准确度较高,且基本无延时;为了使三相并网电流对称,以抑制负序电流为控制目标,正序电流由控制器的外环给定,在正序和负序同步旋转坐标下实现并网电流的控制。在实验室内搭建了并网实验平台,实验结果表明新的控制策略下并网电流波形对称,有效地抑制了负序电流。

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