Modifying Quasi Z-Source Network for an Innovative Extendable Switched-Capacitor Boost Multilevel Inverter Topology

The emergence of Hybrid Multilevel Inverters (HMLIs) represents a significant advancement in addressing the limitations of traditional multilevel inverter (MLI) topologies. In recent years, various concepts and topologies have been proposed to enhance HMLIs, with a primary focus on generating a greater number of AC voltage levels while minimizing component count and utilizing isolated DC sources. Traditionally, these HMLI topologies required two-stage configurations involving DC-to-DC converters, leading to increased costs and complexity. This paper highlights the transition to single-stage DC-AC inverters, which offers substantial benefits, including high boost gain, superior conversion efficiency, and a reduced reliance on passive components. Furthermore, the paper introduces a groundbreaking solution - a 57-level switched-capacitor boost multilevel inverter (SCBMLI), derived from the quasi z-source inverter (qZSI). The proposed SCBMLI offers a multitude of advantages, including the generation of high voltage levels, balancing the voltage of capacitor in the circuit without the need for any control system, and achieving low Total Harmonic Distortion (THD) in high voltage applications.