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基于重复观测器的PWM整流器无差拍控制

, PP. 47-53

Keywords: 无差拍控制,PWM整流器,重复控制,状态观测器,稳定性

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Abstract:

无差拍控制的PWM整流器,其电流稳定性受控制延时以及交流电流采样通道低通滤波器的影响,文中对其影响机理进行了详细的分析,讨论了开环电流预测方法的预测精度及其由误差引起的电网电流畸变问题,提出了采用基于重复控制思想的状态观测器对电网电流进行预测的方法,以达到提高电网电流预测精度的目的。给出了重复观测器的设计方法并对其稳定性进行了分析。实验结果表明,该算法可有效减小电网电流预测的误差,改善PWM整流器无差拍控制的性能。

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