Design-Oriented Mitigation of High-Frequency Resonance in DC Microgrids Based on Cable Length and Switching Frequency

Debora P. Damasceno; Mateus P. Dias; José Carlos U. Peña; José A. Pomilio

doi:10.18618/REP.e202630

Authors

Debora P. Damasceno Federal University of Ceará
Mateus P. Dias Instituto Tecnológico de Aeronáutica
José Carlos U. Peña Flex Power Grid Lab, KEMA Laboratories
José A. Pomilio Universidade Estadual de Campinas https://orcid.org/0000-0001-5457-4438

DOI:

https://doi.org/10.18618/REP.e202630

Keywords:

dc microgrids, EMI filters, high-frequency phenomena, long dc connections, mitigation method

Abstract

A dc microgrid comprises distributed energy sources and loads interconnected through a common dc bus via dc–dc converters. Their inherent switching behavior necessitates input filters to attenuate high-frequency components. However, interactions between cable impedances and converter filters can lead to high-frequency resonance, degrading bus voltage quality and system performance.
This paper proposes a design-oriented mitigation approach for high-frequency resonance in dc microgrids. The method is based on a detailed analysis of the interaction between cable feeders and EMI filters, considering converter dynamic behavior and switching frequency effects. A damping strategy based on the optimal placement of an R–C branch is developed to suppress resonance and improve stability while ensuring compliance with voltage ripple limits derived from MIL-STD-704F. A key contribution of this work is establishing a direct relationship between cable length and the grid-forming converter switching frequency, providing practical design guidelines. This reveals that higher switching frequencies reduce the critical cable length required to trigger resonance, imposing more stringent constraints on dc microgrid layouts. The proposed approach is validated through analytical modeling, simulation results, and experimental tests on a $2$~kW dc microgrid prototype, demonstrating significant reduction in high-frequency distortion and compliance with power quality limits.

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Author Biographies

Debora P. Damasceno, Federal University of Ceará

was born in 1994 in Fortaleza, Brazil. She received the B.S. and M.Sc. degrees in electrical engineering from the Federal University of Ceará (UFC), Fortaleza, Brazil, in 2019 and 2021, respectively. She received the Ph.D. degree in electrical engineering from the University of Campinas (UNICAMP), Campinas, Brazil, in 2025. As part of her doctoral studies, she was a visiting Ph.D. student at the Department of Information Engineering (DEI), University of Padova, Padova, Italy. She is currently a Substitute Professor with the Department of Electrical Engineering, Federal University of Ceará (UFC), Fortaleza, Brazil. Her research interests include power electronics, modeling and control of power converters, stability analysis of interconnected power converter systems, and dc microgrids. Dr. Damasceno is a member of the SOBRAEP and IEEE.

Mateus P. Dias, Instituto Tecnológico de Aeronáutica

was born in 1996 in Quixadá, Brazil. He received the B.S.degree in electrical engineering from the Federal University of Ceará, Fortaleza, Brazil in 2017.He received the M.Sc. degree in 2020 and the PhD degree in 2025 at the University of Campinas, Campinas, Brazil. He is currently a Professor with the Department of Energy Engineering, Instituto Tecnológico de Aeronáutica (ITA), Fortaleza, Brazil.His research interests include power electronics, more electric Aircraft and dc microgrids, bipolar dc microgrids, power quality, high frequency interactions, electrical machines. M.Sc. Dias is a member of the SOBRAEP and IEEE. Dr. Dias was the Chair of the UNICAMP IEEE Power Electronics Society Student Branch Chapter.

José Carlos U. Peña, Flex Power Grid Lab, KEMA Laboratories

was born in 1984 in Peru. He received the B.S. degree in electronic engineering from the National University of Engineering, Lima, Peru, in 2010, and the M.S. and Ph.D. degrees in electrical engineering from São Paulo State University, São Paulo, Brazil, in 2012 and 2016, respectively. From 2022 to 2025, he was a Researcher with the School of Electrical and Computer Engineering, University of Campinas. Currently he is a Researcher with the KEMA Laboratories, Arnhem, The Netherlands. His research interests include power electronics, modeling and control of power converters, microgrids, and power quality.

José A. Pomilio, Universidade Estadual de Campinas

was born in Jundiaí, Brazil, in 1960. He received his B.S., M.S., and Ph.D. in electrical engineering from the University of Campinas, Campinas, Brazil, in 1983, 1986, and 1991, respectively. From 1988 to 1991, he was the Head of the Power Electronics Group at the Brazilian Synchrotron Light Laboratory. He was a visiting professor at the University of Padova in 1993 and 2015 and at the Third University of Rome in 2003 in Italy. He is a Professor at the School of Electrical and Computer Engineering, University of Campinas, where he has been teaching since 1984. His main interests are power electronics and power quality. Dr. Pomilio was the President of the Brazilian Power Electronics Society (SOBRAEP) in 2000–2002 and a member of the Administrative Committee of the IEEE Power Electronics Society in 1997–2002. He was an Associate Editor of the IEEE TRANSACTIONS ON POWER ELECTRONICS in 2003-2018.

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