A Comprehensive Review on Single-Phase Five-level Inverter Topologies

Abstract

Multilevel inverters have been developed to handle high power and high voltage in the flexible power systems. These inverters offer some inherent advantages over conventional 2-level inverters. High quality of the output voltage of the multilevel inverters is one of the most important advantages. Though the multilevel inverters hold attractive features, usage of more switches in the conventional configuration poses a limitation to its wide range application. The emphasis is on reducing the number of switches, which inturn reduces switching losses, and avoiding the capacitors, which may likely to cause voltage imbalance, and using less number of DC sources, which may increase additional isolation Transformer requirements, while designing a new prototype. A review has been done on the recently proposed topologies. A control strategy is proposed in this paper to minimize total harmonic distortion (THD) and a comparative analysis has been made with level shifted pulse width modulation (LSPWM).A prototype has been constructed with less switch count. The simulation analysis is done using PSIM-9.3 and validated through experimentation.