A Novel Cascaded Repetitive Controller of an LC-Filtered H6 Voltage-Source Inverter

The H6 voltage-source inverter (H6-VSI) has been increasingly used in the power distribution systems due to its capacity of maintaining a constant common mode voltage (CMV) amplitude. To simultaneously achieve excellent dynamic and steady-state responses, this article proposes a novel cascaded repetitive controller for the LC-filtered H6-VSI. Compared to the conventional repetitive controller, the proposed cascaded repetitive controller for the LC-filtered H6-VSI shows superior performance in both transients and steady states. Comparative studies of the conventional repetitive controller and the proposed method are presented with both linear and nonlinear loads. Simulation and experimental results confirm the validity of the proposed method.