Total Harmonics Distortion Improvement of AC Grid using Fuzzy Control based 7-Level MLI Compared with a 5-Level MLI by Reducing the Harmonics

This research presents a novel five-level and seven-level inverter topology for improved power quality in multilevel inverter (MLI) systems. The proposed design employs a bidirectional switch and an H-bridge cell, reducing the number of DC sources and simplifying the overall circuit. A fuzzy logic controller (FLC) is implemented to optimize the switching patterns, minimizing Total Harmonic Distortion (THD) and improving output waveform quality. The performance of the proposed topologies is compared with conventional MLI configurations. Results demonstrate that the novel designs achieve lower THD (4.7757) compared to the conventional method (6.7814), while also achieving higher output voltage and current (500V, 15A) compared to the conventional method (320V, 10A). This research contributes to the advancement of MLI technology by offering simplified and more efficient topologies with improved power quality and reduced harmonic distortion.