A Transformer Flux Balancing Scheme Based on Magnetizing Current Harmonic in Dual-Active-Bridge Converters

Gao, Zihan; Yao, Penfei; Li, Haiguo; Ji, Shiqi; Yang, Zhe; Wang, Fred; Ma, Yiwei

doi:10.1109/apec42165.2021.9487210

A Transformer Flux Balancing Scheme Based on Magnetizing Current Harmonic in Dual-Active-Bridge Converters

Conference · Mon Jun 14 00:00:00 EDT 2021 · 2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

DOI:https://doi.org/10.1109/apec42165.2021.9487210· OSTI ID:1974592

Gao, Zihan ^[1]; Yao, Penfei; Li, Haiguo; Ji, Shiqi; Yang, Zhe; Wang, Fred; Ma, Yiwei

University of Tennessee

The Dual-Active-Bridge (DAB) converter transformer flux unbalance, or dc bias, could be a critical issue due to the mismatches of converter circuit parameters and control transients. In this paper, a steady-state flux balancing scheme, based on the second-order harmonic of magnetizing current has been proposed. The relationship between steady-state flux/magnetizing current unbalance and its harmonic contents has been analyzed, with which a new current sensing method and control strategy are introduced. The proposed magnetizing current sensing method can be implemented for both unity and complicated fractional turns ratios, without high sensitivity to dc offset from the analog circuitry. The proposed scheme has been validated with experimental results on 850-V/850-V DAB converters within a system, as well as in an 850-V/6700-V medium voltage DAB unit.

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Research Organization:: University of Tennessee

Sponsoring Organization:: U.S. Department of Energy

DOE Contract Number:: EE0008410

OSTI ID:: 1974592

Report Number(s):: DOE-UTK-08410-3

Journal Information:: 2021 IEEE Applied Power Electronics Conference and Exposition (APEC), Journal Name: 2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

Country of Publication:: United States

Language:: English

References (19)

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