A Novel Common-Ground-Type Nine-Level Dynamic Boost Inverter

Recently, inverters with a common ac and dc ground are gaining significant interests due to their zero common-mode voltage that made them particularly attractive for the solar photovoltaic (PV) application. However, the dc source current of the existing topologies is discontinuous, and their voltage gains are limited. This paper proposes a novel common-ground-type boost inverter that achieves continuous dc source current with significantly enhanced dynamic voltage gain. It consists of one boost inductor, four capacitors, nine power MOSFETs and two power diodes. Voltage-boosting and generation of 9-level ac voltage are achieved concurrently within a single-stage operation. The operation of the proposed CGT-9L-BI inverter is analyzed. Simulation and experimental results are presented for validation.