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提出了一种基于耦合变压器的直流侧串联型有源电力滤波器(active power filter,APF)。该APF通过一个耦合变压器与主电路相连。与不带变压器的直流侧串联型APF相比,它可以灵活地、大范围地改变APF的输出电压,从而充分利用开关器件的容量,并且能够实现APF与主电路的绝缘隔离,防止电力系统的各种干扰直接进入APF中;与传统的交流侧串联型有源电力滤波器相比,有源开关的数量减少了一半,简化了电路结构,降低了成本。理论分析及仿真结果验证了所提拓扑结构的正确性及优越性。
A DC-link active power filter (APF) based on coupling transformer is proposed. The APF is connected to the main circuit via a coupling transformer. It can flexibly and extensively change the output voltage of the APF compared with the DC-side series type APF without a transformer, so as to make full use of the switching device capacity and achieve the isolation between the APF and the main circuit and prevent the power system A variety of interference directly into the APF; Compared with the traditional AC side series-type active power filter, the number of active switches to reduce by half, simplifying the circuit structure, reducing costs. Theoretical analysis and simulation results verify the correctness and superiority of the proposed topology.