NDLI: Modeling and Design of High-Power Enhanced Leakage-Inductance-Integrated Medium-Frequency Transformers for DAB Converters

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Modeling and Design of High-Power Enhanced Leakage-Inductance-Integrated Medium-Frequency Transformers for DAB Converters

Content Provider	MDPI
Author	Zhang, Xinsheng Xiao, Fei Wang, Ruitian Kang, Wei Yang, Beichao
Copyright Year	2022
Description	For dual active bridge (DAB) converters, integrating the phase-shifting inductance (PSI) in the medium-frequency transformer (MFT) is an effective way to improve the overall power density. Different from the existing leakage-inductance-integrated (LII) structure, a concentric-winding (CW) enhanced leakage-inductance-integrated (ELII) structure, which includes an additional core, is proposed in this paper. In order to explain the operating mode of CW ELII MFT, a magnetic circuit model is established, and the analysis is carried out under the typical DAB excitation. The total leakage inductance of CW ELII MFT is divided into the winding leakage inductance and the additional leakage inductance for calculation. The integrated structure makes the heat dissipation of the MFT challenging. Therefore, the air–water combined cooling method is adopted in the design. A thermal resistance model is built for the winding air channel under forced convection. On this basis, MFT designs with different integration structures for different leakage inductance requirements are compared. Finally, a 200 kW/4 kHz/200 μH MFT prototype was designed and manufactured, which achieved the power density of 5.16 $kW/dm^{3}$ and the efficiency of 99.30%. The prototype was tested in a DAB converter, which is a module of a 2 MW modular multilevel converter-bidirectional DC–DC converter (MMC-BDC).
Starting Page	1361
e-ISSN	19961073
DOI	10.3390/en15041361
Journal	Energies
Issue Number	4
Volume Number	15
Language	English
Publisher	MDPI
Publisher Date	2022-02-14
Access Restriction	Open
Subject Keyword	Energies Energy and Fuel Technology Industrial Engineering Medium-frequency Transformer Inductor Integration Dab Converter Optimal Design
Content Type	Text
Resource Type	Article

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