Ultra-High Voltage Gain Transformerless DC-DC Converter for Renewable Energy Applications

Integrating renewable energy sources, such as solar photovoltaic, into DC microgrids requires DC-DC converters with high voltage gain due to the inherently low output voltage of these sources. Conventional converters, however, face significant challenges, including high voltage stress, limited gain, and issues with diode reverse recovery. To overcome these challenges, transformerless high-step-up converters utilizing switched-capacitor and switched-inductors techniques have emerged as promising alternatives. This paper presents a groundbreaking ultra-high voltage gain DC-DC converter that combines an active switchedinductor with a switched-capacitor network. The proposed design achieves exceptional voltage gain even at lower duty cycles while minimizing voltage stress on the switching components. Unlike traditional converters, this solution enhances performance without introducing excessive circuit complexity with improved voltage gain and reduced component stress, the converter offers a highly efficient and reliable solution for renewable energy systems. A Comparative analysis is presented to validate its effectiveness. Finally, the operational and dynamic performance of the presented converter is verified to confirm its functionality.