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基于高频隔离的负序级联式补偿电路拓扑

, PP. 171-175

Keywords: 负序电流补偿,三相四线制,级联,双向直流隔离变换器,移相控制

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Abstract:

提出了一种可以级联应用于高压场合的负序电流补偿电路拓扑。此电路通过内部相互耦合的高频隔离变压器进行负序能量交换,实现了对于三相四线制或者三相三线制中不平衡电流的补偿。这种拓扑克服了传统按照星型连接的电压型H桥级联构成的APF应用于高压系统中无法进行负序电流补偿的缺点,实现了相间能量交换,并且能够在单级和多级级联后均可进行无功,谐波和负序电流的补偿。系统通过三绕组变压器降低了直流侧电容电压的二次脉动,减小了所需电容量。文章通过对两级级联系统的仿真,证实了电路拓扑的可行性,所构建的小功率实验平台进一步验证了所提出方案的有效性。

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