Performance Analysis of a Seven-Level Multilevel Inverter in Grid-Connected Systems

Abstract

This paper describes the design and analysis of a proposed seven-level multilevel inverter for integrating renewable energy sources into the power grid. Power conversion options that are efficient and trustworthy are crucial for effortless integration and effective use of renewable energy systems, which are becoming increasingly prevalent. Compared to conventional two-level inverters, multilevel inverters have several benefits, including less harmonic distortion, less voltage stress on the power devices, and improved power quality. A cascaded H-bridge structure combines the advantages of a modified phase-shifted pulse width modulation (PWM) control scheme in the proposed seven-level multilevel inverter topology. The design parameters and switching angles are optimised to achieve the highest power efficiency and least harmonic distortion. The proposed inverter is subjected to a thorough analysis, considering power losses, total harmonic distortion, and voltage waveforms. The proposed inverter's performance metrics and simulation results contrast the current multilevel inverter topologies. The proposed seven-level multilevel inverter offers better voltage quality, less total harmonic distortion, and lower power losses when compared to other existing topologies, according to simulation results. The suggested inverter also offers a superior output voltage waveform appropriate for the grid integration of renewable energy sources. The analysis and assessment provided in this paper confirm the viability and efficacy of the seven-level multilevel inverter suggested for integrating renewable energy, thereby advancing conversion technologies in the application of energy-efficient systems.