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电网不平衡时电压型PWM整流器混合无源控制

, PP. 159-166

Keywords: 电网不平衡,PWM整流器,混合无源控制器,能量存储函数,阻尼注入

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Abstract:

针对国内外电网不平衡时电压型PWM整流器控制策略存在控制结构复杂和控制性能不佳的问题,提出了由直流电压环(PI)与无源电流控制器组成的电压型PWM整流器混合无源控制器。基于整流器的EL(Euler-Lagrange,EL)模型,利用阻尼注入方法设计了无源电流控制器。根据无源电流控制器确定出具有补偿电网不平衡功能的开关函数。该混合无源控制器只需电压、电流的实时值,通过混合无源控制器就可消除或抑制整流器输入电流中的所有谐波且使整流器具有恒定的直流电压;可使整流器具有良好的性能和简单的控制结构。仿真和实验结果表明,电网不平衡时电压型PWM整流器混合无源控制是可行的。

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