A Novel Modified Multilevel Inverter for Improved Performance in Renewable Energy Systems

Multilevel Inverters (MLIs) are crucial in photovoltaic (PV) systems since they enhance efficiency, reduce Total Harmonic Distortion (THD), and minimize switching losses. There is a comparison between the Cascaded H-Bridge (CHB), the Flying Capacitor (FC), the Neutral Point Clamped (NPC), and a modified MLI design, which is shown in this research. The redesigned inverter, which consists of three DC sources, four diodes, and seven switches, achieves an efficiency of 98%, which is higher than the CHB (96%), FC (95%), and NPC (96%). The performance of the inverter is validated using simulations conducted in MATLAB/Simulink, which include a wide range of modulation indices and load conditions. While the modified topology reduces total power loss to 180W, it produces 308.75V with a THD of 7.3% at m=0.95. In contrast, cascaded H-bridges produce 200W and neutral point clamped MLIs produce 220W. A power factor of 0.93 and an efficiency of 93% are achieved by the system when it is subjected to conditions of resistive-inductive load interaction. In comparison to conventional topologies, the MLI that has been proposed reduces switching and conduction losses by around fifteen percent, which guarantees greater voltage balancing and fault tolerance via its implementation. In addition, the inverter functions in a manner that guarantees consistent operation via the use of a simplified control mechanism, which makes it an economical choice for grid-connected solar applications. Based on the findings of the research, it has been established that the redesigned design has increased power quality by a substantial amount, decreased harmonic distortions, and enhanced system reliability, therefore establishing it as a viable alternative for the future generation of renewable energy systems.