Multilevel Inverter with Switched Capacitor Technique and Fuzzy Controlled Converter for Efficient PV Grid Integration

Abstract

Reliable grid interface, effective power conversion, and minimal harmonics are necessary for the integration of Renewable Energy Sources (RES) into contemporary power systems. In this study, a Photovoltaic (PV)-based grid-connected power conversion system employing a Modified DC-DC Boost Converter (MBC) and a Reduced Switch Nineteen Level Switched-Capacitor Multilevel Inverter (SC-MLI) is presented for efficient DC-AC conversion and grid interfacing with intelligent control strategies. The PV voltage is increased to the required level using an MBC. For accurate converter regulation and stable output under changing load and solar irradiation circumstances, a Fuzzy Logic Controller (FLC) is used. Overall, the system combines fuzzy logic and PI control to ensure high voltage regulation, reduced harmonics, and improved efficiency in solar-to-grid power conversion. An SC-based MLI deployed to improve power quality for grid integration lowers THD and raises output voltage levels. The entire system is validated in MATLAB/Simulink, and the outcomes prove that the proposed model is appropriate for sustainable PV-based grid applications since it guarantees effective power conversion (96\%), dynamic adaptability, and improved THD of $\mathbf{0 . 2 3 \%}$ performance compared to the other models.