Capacitor Size Comparison on High-Power DC-DC Converters with Different Transformer Winding Configurations on the AC-link
Paper i proceeding, 2020

This paper compares the capacitor requirement of the modular multi-level converter based dual-active-bridge (MMC-DAB) and the controlled transition bridge based dual-active-bridge (CTB-DAB) DC-DC converters. Three winding configurations, namely YY, DD, and YD, are considered for the AC-link's medium-frequency transformer (MFT). It is shown that for a specific inverter topology (i.e., MMC or CTB), the YY and DD connections of the MFT results in identical energy storage requirements for the converters. Moreover, it is demonstrated that the YD connection reduces the capacitor requirements of the converters considerably. In the best case, the capacitor requirement can be reduced for the MMC-DAB and the CTB-DAB by 30% and 40%, respectively. A comparison between the converters showed that the YY-connected MMC-DAB (the YD-connected CTB-DAB) has the highest (the lowest) energy storage requirement. Additionally, it is shown that the YD-connected CTB-DAB can achieve up to 78% (58%) less energy storage compared to the YY-connected MMC-DAB in the best case (worst case).

ZVS converters

High voltage power converters

High frequency power converter

Emerging technology

Multilevel converters

High power density systems


Emerging topology

Three-phase system

DC collector network


Babak Alikhanzadehalamdari

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Torbjorn Thiringer

Chalmers, Elektroteknik, Elkraftteknik, Elmaskiner och kraftelektronik

Yuhei Okazaki

ABB Corporate Research Center

2020 22nd European Conference on Power Electronics and Applications, EPE 2020 ECCE Europe


2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)
Lyon, France, France,

Kraftelektronikbaserad dc-transformatorer för havbaserat mellanspännings DC-nät

Energimyndigheten, 2017-01-01 -- 2020-12-31.





Annan elektroteknik och elektronik



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