An Extendable Zeta Converter Based Grid-Connected Multilevel Inverter with Model Predictive Control Method

Abstract

This study presents design and analysis of an extendable grid-connected DC-AC n-level multilevel inverter with the minimum component count for renewable energy systems, specifically focusing on photovoltaic (PV) panel applications. The proposed topology utilizes a zeta converter based on a coat circuit to harness potential of PV panels, allowing for the extraction of multiple DC voltage levels. These multi-output DC voltages are subsequently employed to generate a multilevel AC output voltage. In addition, model predictive control (MPC) method is applied to the n-level multilevel inverter instead of complex modulation algorithms in order to provide gate signals of the switches and to secure grid connection. Proposed multilevel inverter topology not only ensures high-quality AC output but also enhances grid integration and compatibility with various renewable energy applications. Simulation studies have been implemented in MATLAB/Simulink. Through design and simulation, this paper demonstrates the robustness and effectiveness of the proposed topology, making it valuable for renewable energy systems. © 2024 IEEE.