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电网电压不平衡下串联型12脉波整流装置的频域谐波建模

, PP. 69-78

Keywords: 12脉波整流,不平衡电压,谐波模型,换相重叠角,耦合导纳矩阵

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Abstract:

针对高压直流输电和大功率工业整流采用的串联型12脉波整流装置,在分析其整流等效电路工作原理的基础上,计及电压不平衡时相控整流电路的触发角偏移和换相重叠角,推导了正序和负序电压作用下12脉波整流的谐波耦合导纳矩阵,将两者整合建立电压不平衡下12脉波整流的频域谐波耦合导纳模型。该模型能解析计算整流装置产生的电流谐波,无需迭代。搭建整流装置实验测试平台,探讨12脉波整流的谐波耦合导纳矩阵元素分布特点,分析电压畸变率、不平衡度和触发角变化对模型准确度的影响,通过计算与实验对比,验证所提频域谐波模型的有效性。

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