Shareef Shaik, Venkatesh P, Parimalasundar E.
Efficiency of renewable energy conversion systems is gaining momentum with the trend toward compact power conversion architectures, which provide interfacing between low-voltage photovoltaic sources and medium-voltage Alternating Current (AC) systems while maintaining satisfactory quality. Conventional multilevel inverter topologies like Neutral-Point-Clamped (NPC), Flying Capacitor (FC), and Cascaded H-Bridge (CHB) abnormalities lead to huge devices, switching losses, and system complexity. For the first time, this article presents an integrated power conversion structure in which a high-gain single-input multi-output Direct Current (DC)-DC converter is combined with a reduced-switch fifteen-level DC–AC multilevel inverter to overcome these limitations. The system defined in this work produces many regulated DC voltage levels from one Photo Voltaic (PV) source and implements these asymmetrical voltages to synthesise a stepped multilevel AC through higher-voltage utilisation and decreased components required. In such a study, a sinusoidal pulse-width modulation control strategy is adopted to ensure stable driving operation and synthetic voltage in various loads. Simulation results indicate that the configuration achieves an output Root Mean Square (RMS) voltage of 230 V and a peak voltage of 325 V with enhanced harmonic performance, with a Total Harmonic Distortion (THD) for current and voltage at 3.9% and 2.8%, respectively. Moreover, the reduced active switches and absence of clamping diodes lower switching and conduction loss to 68 W and 54 W, respectively, leading to a total power dissipation of 122 W and a maximum efficiency of 96.4%. Therefore, the proposed architecture provides a compact and efficient solution for grid-connected photovoltaic systems, electric vehicle charging infrastructure, and distributed renewable energy applications that require high-quality power conversion.