Design and Implementation of an Efficient Dual‐Input Single‐Output High‐Gain DC‐DC Converter for Enhanced Solar Power Integration

ABSTRACT Traditional DC‐DC converter topologies often encounter challenges such as low voltage gain, discontinuous input current, and the absence of a common ground (CG) between source and load terminals. Moreover, many of these topologies struggle to efficiently integrate power from multiple low‐voltage sources, such as photovoltaic (PV), fuel cells, and battery storage, to supply high‐voltage DC at a common DC bus terminal. To overcome these challenges, this paper introduces three different dual‐input single‐output (DISO) DC‐DC converters, derived from the traditional Buck, Boost, and SEPIC topologies. After a comparative analysis, the Boost‐based DISO converter is identified as the most favorable for practical applications. The proposed DISO step‐up DC‐DC converter, based on the conventional boost topology, is designed and analyzed for grid‐tied applications, aiming to achieve high voltage gain from low‐voltage PV sources. A key advantage of this converter is the establishment of a CG between the input and output ports, while maintaining a continuous input current characteristic at both input ports. The paper explores the different operating modes and performs a steady‐state analysis under various input conditions. The output voltage expression of the DISO converter, incorporating both input sources, is derived through equivalent circuit analysis. Additionally, the paper discusses the voltage and peak current stresses on different devices and provides design equations for the passive components. A comprehensive performance comparison highlights the primary benefits of the proposed topology over existing DISO topologies. Simulation results, using the PSIM simulator, validate the converter's operational characteristics, and experimental results from a W prototype converter affirm the accuracy of the analysis and demonstrate its practical performance.