提出了基于载波相移-正弦脉宽调制(CPS-SPWM)技术的级联H桥型多电平变流器,它是CPS-SPWM技术与级联H桥型变流器拓扑结构的结合,同时具备二者的优点,在大功率变流器领域具有很好的应用前景。文中给出了载波相移技术在级联H桥型变流器上的具体实现方法,并将其应用在并联型有源电力滤波器(APF)中,对直流侧总电压闭环电压控制的原理进行了验证。仿真和实验结果表明,该并联型APF系统在低开关频率情况下能够准确有效地补偿谐波和无功电流,性能良好。 A cascaded H-bridge multi-level converter based on Carrier Phase Shift-Sinusoidal Pulse Width Modulation (CPS-SPWM) is proposed, which is a combination of CPS-SPWM technology and cascaded H-bridge converter topology. At the same time with the advantages of both, in the field of high-power converter has a good application prospects. In this paper, the concrete realization method of carrier phase shift technique in cascaded H-bridge converter is given and applied to parallel active power filter (APF), the principle of total voltage closed-loop voltage control Verified. Simulation and experimental results show that the parallel APF system can accurately and effectively compensate the harmonic and reactive current with good performance at low switching frequency.