A Flux Balancing Strategy for 10-kV SiC-Based Dual-Active-Bridge Converter

Gao, Zihan; Yao, Pengfei; Li, Haiguo; Wang, Fred

doi:10.1109/wipda56483.2022.9955288

A Flux Balancing Strategy for 10-kV SiC-Based Dual-Active-Bridge Converter

Conference · Sun Nov 06 23:00:00 EST 2022 · 2022 IEEE 9th Workshop on Wide Bandgap Power Devices & Applications (WiPDA)

DOI:https://doi.org/10.1109/wipda56483.2022.9955288· OSTI ID:1974596

Gao, Zihan ^[1]; Yao, Pengfei ^[2]; Li, Haiguo ^[3]; Wang, Fred ^[3]

The University of Tennessee,Min H. Kao Department of Electrical Engineering and Computer Science,Knoxville,TN,USA; University of Tennessee
China Huaneng Group Co., Ltd.,Beijing,China
The University of Tennessee,Min H. Kao Department of Electrical Engineering and Computer Science,Knoxville,TN,USA

The transformer flux unbalance in dual-active-bridge (DAB) converters is a critical issue due to the electrical parameter and modulation mismatch, and load or control transients. Compared to low voltage DAB converters, the unbalance problem in medium voltage DAB converters may cause more severe problem, and become more difficult to deal with, because of the high operating voltage and insulation requirement. In this paper, a flux balancing strategy for a medium voltage (MV) DAB converter is proposed, including the transformer design with ferrite gap, current harmonic-based unbalance detection, as well as the flux balancing control scheme. With the proposed ferrite gap, nonlinear magnetizing current and its modeling are induced. Then, by analyzing the current harmonics, the flux unbalance level can be detected, and hence controlled. Test results have verified the proposed method in a MV DAB converter.

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Research Organization:: University of Tennessee

Sponsoring Organization:: U.S. Department of Energy

DOE Contract Number:: EE0008410

OSTI ID:: 1974596

Report Number(s):: 865-974-2146

Journal Information:: 2022 IEEE 9th Workshop on Wide Bandgap Power Devices & Applications (WiPDA), Journal Name: 2022 IEEE 9th Workshop on Wide Bandgap Power Devices & Applications (WiPDA)

Country of Publication:: United States

Language:: English

References (14)

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