基于开关电容的阻抗源四桥臂逆变器及其漏电流抑制与电压增益提升

This article introduces an impedance-source four-leg inverter (IS4LI) based on a switched-capacitor technique to achieve the constant common-mode voltage (CMV) and suppress the leakage current. The space vector modulation (SVM) with shoot-through state insertion is implemented to provide the high boost capability. Then, proposed SC-IS4LI can improve the output voltage quality with high modulation index operation. In addition, the proposed SC-IS4LI also provides low voltage stress on the devices. The operating analyses and closed-loop control method of the proposed SC-IS4LI are presented. A comparative study of the proposed SC-IS4LI and existing impedance-source inverter topologies is also performed. Finally, the effectiveness of the proposed SC-IS4LI is validated by simulations and experiments.