One-cycle control for three-phase single-capacitor Z- source inverter with unity power factor

Abstract

ABSTRACTThis paper proposed a novel three-phase single-capacitor Z-source inverter (SC-ZSI) topology and a one-cycle control (OCC) method for three-phase SC-ZSI. It uses a unique single-capacitor Z-source impedance network for boosting its output voltage. Comparing with SL-ZSI and SL-qZSI, the proposed SC-ZSI reduces capacitor voltage stress and inductor current stress with the same boost factor. Comparing with L-ZSI, SL-ZSI, and SL-qZSI, the proposed SC-ZSI can provide a high boost factor with a small shoot-through duty ratio. A novel OCC method for three-phase SC-ZSI with unity-power-factor correction is proposed. The method is composed of two parts and described in detail. One part is the OCC for DC link voltage, and the other part is three-phase AC voltage OCC based on SVPWM. The simulation and experimental results show that the topology of SC-ZSI is correct and the OCC for SC-ZSI is effective.