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电网不平衡情况下三相PWM变换器并联控制

, PP. 139-144

Keywords: 电网不平衡,模块并联,环流控制,PWM变换器

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Abstract:

电网不平衡情况下,三相PWM变换器并联系统中会同时出现电流正负序和零序环流分量,本文提出了一种基于正序、负序同步旋转坐标下环流控制策略。建立了并联变换器在电网不平衡情况下的数学模型,在明确环流的定义后,对环流中的各种主要成分及其影响因素进行了分析,通过分析得出环流同时含有正序、负序和零序成分,通过控制各模块的正序、负序电流以及模块间的零序环流能够实现对环流的控制,在此基础上设计了相应的环流控制器。本方法适用于共直流母线交流侧并联的三相PWM变换器系统,能够在电网不平衡和并网电抗器不同的条件下实现环流控制。实验结果验证了所提出方法的有效性。

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