A single phase nine level common ground switched capacitor inverter with double boosting capability

Abstract

This article suggests a nine-level (9L) seven-switch (7S) transformer-less (TL) common-ground (CG) switched capacitor (SC) inverter with double boosting capability. The proposed 9L7S-CGSC-TL inverter comprises only seven switches (7S), two diodes, three self-balanced capacitors, and one DC source. The suggested inverter has a CG connection which eliminates ground leakage currents. Additionally, the suggested topology necessitates fewer conducting devices, thereby reducing conduction losses. The voltage across every capacitor is automatically balanced within each fundamental cycle. The proposed topology has been evaluated based on parameters such as component count, total harmonic distortion, cost, and efficiency. The proposed configuration switching sequence is governed by employing the level-shifted pulse width modulation technique. A power loss study was conducted to determine the efficiency of the proposed switched capacitor multilevel inverter (SCMLI) under different load conditions in PLECS. The results shows that the proposed SCMLI achieves a peak efficiency of 98.17%. Further, the lifespan of the proposed SCMLI is assessed through a reliability assessment. The simulation and experimental results at different conditions are presented and elucidated.