31-LEVEL MULTILEVEL INVERTER TOPOLOGY FOR STAND-ALONE MICROGRID USING FUZZY LOGIC

Abstract

The increasing integration of renewable energy sources in microgrid systems necessitates efficient and high-quality power conversion. This paper presents a novel 31- level multilevel inverter (MLI) topology for standalone microgrid applications powered by a hybrid wind-photovoltaic (PV) system. The proposed MLI is designed with a minimal number of switches, reducing complexity, switching losses, and overall system cost while achieving high output voltage levels with lower total harmonic distortion (THD). A Fuzzy Logic Controller (FLC) is implemented to enhance the performance of the inverter, ensuring dynamic adaptability to variations in renewable energy generation and load conditions. Compared to traditional PI controllers, the FLC-based control strategy provides superior voltage regulation, rapid response, and improved system stability. The high-level output waveform of the proposed inverter significantly enhances power quality, reducing the need for bulky filters. Simulation and experimental validation confirm that the proposed 31- level inverter effectively integrates wind and PV sources while delivering high-efficiency and distortion-free power suitable for standalone microgrid applications. The results demonstrate improved power quality, lower THD, and enhanced system reliability, making it a promising solution for sustainable energy-based microgrids. KEYWORDS: Multilevel inverter (MLI), 31-level inverter, Wind-PV hybrid system, Minimal switches, Standalone microgrid, Fuzzy Logic Controller (FLC), Total Harmonic Distortion (THD), Power quality.