Study and Design of a Non-Isolated Bidirectional DC-DC Converter Based on a Switched Inductor and Voltage Multiplier Cell for Renewable Energy Applications

Fabiano G. Nimitti; António M. S. S. Andrade

doi:10.18618/REP.e202558

Authors

Fabiano G. Nimitti Federal University of Santa Maria https://orcid.org/0000-0002-2956-9319
António M. S. S. Andrade Federal University of Rio Grande do Sul https://orcid.org/0000-0001-6098-0475

DOI:

https://doi.org/10.18618/REP.e202558

Keywords:

bidirectional DC-DC converter, non-isolated, switched inductor, voltage multiplier

Abstract

In this paper, a bidirectional converter with low voltage stress is evaluated. The converter is based on a switched inductor technique combined with a switched capacitor in a voltage multiplier structure, enabling a higher voltage gain while maintaining reduced stress on the switching components. Both dynamic and static modeling are developed to provide a comprehensive understanding of the converter behavior and a control strategy is proposed to ensure stable operation under varying load and input conditions. To validate the theoretical analyses, a hardware prototype was designed and implemented, operating at 80-500 W with an input to output voltage range of 72-400 V. Experimental tests were conducted under different operating conditions, confirming the effectiveness of the proposed converter. A peak efficiency of 98.4\% was achieved at 250 W, demonstrating the high performance of the converter. Additionally, the ability to reverse power flow online without requiring shutdown enhances its applicability in renewable energy systems and energy storage interfaces.

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Author Biographies

Fabiano G. Nimitti, Federal University of Santa Maria

received the B.Sc. degree in electrical engineering from the Lutheran University of Brazil (ULBRA), Canoas, Brazil in 2020, and in 2022 the M.S. degree in electrical engineering from the Federal University of Santa Maria, Santa Maria, Brazil, where he is currently working toward the Ph.D. degree. His research interests include: modular systems, modulation, adaptive control, DC-DC bidirectional converters and linear control applied to power electronics.

António M. S. S. Andrade, Federal University of Rio Grande do Sul

was born in Ribeira Grande, Cabo Verde. He received the Bachelor of Science degree in automation and control engineering from the University of Caxias do Sul, Caxias do Sul, Brazil, in 2012, and the M.S. and Ph.D. degrees in electrical engineering from the Federal University of Santa Maria, Santa Maria, Brazil, in 2015 and 2018, respectively. From 2018 - 2023, he was professor at UFSM and since 2023 he is professor at UFRGS. He serves as an Associate Editor of International Journal of Circuit Theory and Applications and Applied Sciences in the special issue ”Renewable and Sustainable Energy Conversion Systems”. He was also selected as Distinguished Reviewer of 2022. His research interests include renewable energy, energy storage systems, DC-DC converters, and microinverters.

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