针对三相不可控整流桥，提出一种基于阻抗耦合的三相直流侧有源电力滤波器的拓扑结构及其控制策略，该滤波器由阻抗网络和不对称双Boost电路构成。控制策略采用平均电流控制，分别采用前沿和后沿调制方法来获取两个Boost电路的开关信号。与一般的直流侧有源电力滤波器相比，减少了1个有源开关和1个电容，可以降低成本，而直流侧也不再存在电压不平衡的情况。最后通过仿真验证了该拓扑结构的正确性和有效性。

A three-phase DC link active power filter (APF)based on coupled impedance and its control strategy are proposed in order to eliminate the input current harmonics of the three-phase diode rectifier. The presented APF is composed of impedance network and two asymmetric dual Boost converters. Average current control is adopted to control the DC link APF. The switch signals of the two asymmetric Boost converters are obtained respectively by leading and trailing edge modulation methods. Compared with the normal DC link active power filter,this topology reduces an active switch and a capacitance. So it can reduce costs,and there is no voltage imbalance in the DC link. Simulation results verify the correctness of the proposed topology and the corresponding control method.

全国优秀博士论文作者专项基金资助项目(200948);教育部新世纪人才计划项目(NCET-09-0839)；输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512711101)；重庆市杰出青年科学基金项目(CSTC2012JJJQ90004)