AC Grid–DC Microgrid Coupling with High-Performance Three-Phase Single-Stage Bidirectional Converters

Ahmed Y. Farag, Tarek Younis, Davide Biadene and Paolo Mattavelli ()
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Ahmed Y. Farag: Department of Management and Engineering (DTG), University of Padova, 36100 Vicenza, Italy
Tarek Younis: Department of Electrical Engineering, Aswan University, Aswan 81528, Egypt
Davide Biadene: Department of Management and Engineering (DTG), University of Padova, 36100 Vicenza, Italy
Paolo Mattavelli: Department of Management and Engineering (DTG), University of Padova, 36100 Vicenza, Italy

Energies, 2023, vol. 16, issue 17, 1-16

Abstract: This paper discusses bidirectional step-down topologies that enable the interface of the 400 V unipolar DC microgrid with the European low-voltage three-phase AC grid. The study compares three single-stage non-isolated topologies, namely, the seven-switch buck converter, Swiss converter, and Y-converter, based on semiconductor stresses and losses, magnetic component sizes and losses, and heat sink sizes. The analysis is conducted for a 10 k W converter designed for small commercial or residential use. The results indicate that the Y-converter has superior overall performance compared to the other topologies, making it a potentially better candidate for this application. A 10 k W prototype of the Y-converter is constructed. It is demonstrated to have a peak efficiency of 99.26 % and an efficiency of 97.47 % at the rated output power.

Keywords: DC microgrid; three-phase PFC rectifiers; seven-switch rectifier; Swiss rectifier; Y-converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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