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不平衡非线性负载下三相逆变器的建模与控制

, PP. 83-95

Keywords: 不平衡非线性负载,三相三线制逆变器,广义状态空间平均法,dq0变换,电感电流滑动平均

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Abstract:

为缓解实际应用场合中不平衡非线性负载对三相逆变器输出电压的影响,并改善混合负载切换时的动态特性,本文提出了基于广义状态空间平均的建模方法和电感电流滑动平均的控制策略。通过广义状态空间平均法对平衡负载下的逆变器进行了准确的建模,并在dq0坐标系下设计了PI控制器,最后利用电感电流滑动平均方法使PI控制器适于三相不平衡负载和非线性负载。与传统控制方法的对比实验表明,本文提出的模型和控制策略能够在保证混合负载下三相电压平衡的基础上,较好地提高负载切换时的动态特性。

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