基于两相级联H桥的三相有源电力滤波器的控制与调制

Control and Modulation of Three-Phase APF Based on Two-Phase Cascaded H Bridge

针对三相三线制电力系统仅要求补偿谐波电流时,传统的基于三相级联H桥的三相有源电力滤波器(APF)成本较高的问题,提出了一种基于两相级联H桥的三相APF拓扑结构。省去了传统三相级联H桥中任一相桥臂的H桥,不仅不影响补偿效果,而且能达到降低成本的目的。同时直流侧电压采用分层控制,谐波检测采用id-iq电流检测策略。最后,通过搭建PSCAD/EMTDC仿真平台并验证。仿真结果表明,新拓扑结构应用于补偿三相三线系统中的谐波电流是可行的。

As the three-phase three-wire power system only requires compensating harmonic currents,the cost of the traditional three-phase three-wire power system based on the three-phase cascaded H bridge inverter is too much. So,the three-phase APF based on the two-phase cascaded H bridge inverter was proposed.This topology can eliminate the number of one-phase’s cascaded H bridge to save the cost,but this change does not affect the inverter’s final compensation effect.A simulation platform through PSCAD/EMTDC was built.The simulation results show that the topology applied to compensate harmonic currents for a three-phase three-wire system is feasible.