Novel High Step-Up DC-DC Converter With Three-Winding Coupled-Inductor for Renewable Energy Applications

Renewable energy sources, while critical for sustainable energy systems, often depend on power converters due to their inherently low and fluctuating output voltages. Photovoltaic panels, for instance, typically generate low output voltages that require substantial stepping up to meet grid or load requirements. This study presents an enhanced high step-up DC-DC converter featuring a single-switch design, Enhanced performance efficiency, and a continuous input current. By addressing the challenges associated with high step-up applications, this converter aims to enhance the incorporation of renewable energy sources, specifically photovoltaic systems, into practical applications. The proposed architecture integrates a three-winding coupled inductor in conjunction with a voltage multiplier cell, allowing for substantial voltage escalation. Distinguishing itself from conventional approaches that depend on extended duty cycles, this converter attains high voltage gain by precisely manipulating the turn ratio of the coupled inductor, thereby circumventing the limitations of high-duty cycle operations. A comprehensive exploration of the converter's operational modes, coupled with a detailed theoretical model, is presented. An extensive simulation study is conducted, validating the converter's performance and ensuring congruence between theoretical analysis and simulation results.