High-Stability and Cost-Effective Ultra High Step-Up DC-DC Converter for Solar-Powered DC Microgrids

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Document Type : Original Article

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Faculty of Electrical and Computer Engineering, University of Tabriz

Abstract

In solar-powered DC microgrids, utilization of a high-voltage-gain and stable DC-DC converter is essential. This paper proposes an ultra-high step-up DC-DC converter by combining voltage-boosting structures, an improved switched-capacitor (SC) cell, and a three-winding coupled inductor. The proposed converter not only achieves ultra-high voltage gain but also features low voltage stress on semiconductor elements, continuous input current with minimal ripple, low cost, high power density, common ground between input and output, and high efficiency. Additionally, the application of the pole placement control strategy and the appropriate positioning of system poles enhance the converter’s stability. A detailed analysis of the proposed converter is provided, covering its operational principles, mathematical derivations, and element design. A comparative evaluation is conducted based on key performance criteria for DC microgrids and solar energy systems, demonstrating the advantages of the proposed topology. Finally, a 200 W experimental prototype is developed to validate the theoretical findings, and the corresponding results are presented.

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Tabriz Journal of Electrical Engineering

Articles in Press, Corrected Proof
Available Online from 27 May 2025

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