Investigation of Hybrid Multilevel Inverter Performance via FFT Analysis Implemented in Simulation

Abstract

This paper presents a comparative study of various hybrid multilevel inverter (HMLI) configurations with respect to their output voltage levels and overall performance. The focus is on harmonic elimination in HMLIs to reduce the total harmonic distortion (THD) of the voltage applied to the load, thereby improving power quality [1,2]. Different HMLI topologies are analyzed and compared, emphasizing their effectiveness in minimizing harmonics. By dividing the switching process into high- and low-frequency components, the proposed approach aims to enhance converter efficiency while simultaneously reducing size and cost [3]. Furthermore, this study introduces the performance analysis of a novel hybrid multilevel inverter topology, referred to as SHMLI, employing various pulse width modulation (PWM) strategies. The PWM techniques investigated include multicarrier phase disposition (PD) and phase shift modulation methods, which have been demonstrated to improve switching performance and harmonic profile [4,5]. All simulations and analyses are conducted using MATLAB-SIMULINK to validate the theoretical findings.

Keywords: Hybrid Multilevel Inverter (HMLI), Total Harmonic Distortion (THD), Pulse Width Modulation (PWM), Phase Disposition (PD), Symmetrical Hybrid Multilevel Inverter (SHMLI)