Fault Analysis and Clearance in FL-APC DC–AC Converter

This paper presents a new five-level APC (FL-APC) dc–ac converter capable of voltage step-up in a single-stage inversion. In the suggested design, a common ground not only reduces the CMV-HF but also improves dc-link voltage usage. While comparing with traditional two-stage FL-APC dc–ac converter, the proposed design has lower voltage stresses and greater uniformity. While improving overall efficiency, the suggested clamped dc–ac converter saves three power switches and a capacitor. Modeling and actual tests have proven the suggested APC inverter’s overall operation, efficacy, and achievability. The proposed circuit is finally tested with fault clearance capability

Keywords: — Common-mode voltage with high frequency (CMV-HF), fault analysis, fault clearance, five-level active neutral-point-clamped (FL-APC) dc–ac converter.