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磁通补偿串联APF采用多绕组变压器的不必要性

DOI: 10.13336/j.1003-6520.hve.2015.07.041, PP. 2415-2420

Keywords: 有源电力滤波器,串联变压器,基波磁通补偿,谐波等效阻抗,变压器二次补偿绕组数,不必要性

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Abstract:

为促进基于基波磁通补偿的有源滤波器的实际应用,对传统的采用多绕组串联变压器实现大容量的方式进行了研究。首先将串联变压器和逆变器作为一个整体,建立串联变压器谐波等效阻抗的精确数学模型。然后根据串联变压器的匝比k和二次绕组数N的相互关系,将多绕组技术分为“分裂法”和“增加法”两种方式,分别分析串联变压器的谐波等效阻抗。结果表明对于“增加法”,当N足够大时,串联变压器在主要谐波频段上相当于导线,滤波效果变差;而对于“分裂法”,滤波效果不变,但逆变器容量增加N倍。因此认为串联变压器采用多绕组技术是不必要的。

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