Comparative Study of a Multi-MW High Power Density DC Transformer with an Optimized High Frequency Magnetics in All-DC Offshore Wind Farm
Artikel i vetenskaplig tidskrift, 2016

In this paper, the design of a 1/30 kV, 10 MW modular isolated DC-DC converter is presented. The design and optimization of a high frequency transformer as the key part of such a converter is addressed. Efficiency curves for different semiconductors and frequencies are presented in order to find an optimum frequency enabling adequate transformer volume reduction with a suitable compromise with the converter efficiency. It was found that for this voltage level and size, it is no point to go above 6 kHz from the transformer perspective since the isolation requirement leads to that the size is not reduced much more for even higher frequencies. At 5 kHz, the efficiency of the transformer having a nanocristalline core reached 99.7% while the power density was about 22 kW/l. For the whole DC-DC converter, an efficiency of 98.5% was reached at 5 kHz switching frequency using SiC MOSFETs as switching elements while the efficiency when using IGBTs reached 97.2% at the same frequency.

high-frequency transformers

DC-DC power converters


Amin Bahmani

Chalmers, Energi och miljö, Elkraftteknik

Torbjörn Thiringer

Chalmers, Energi och miljö, Elkraftteknik

Ali Rabiei

Chalmers, Energi och miljö, Elkraftteknik

Tarik Abdulahovic

Chalmers, Energi och miljö, Elkraftteknik

IEEE Transactions on Power Delivery

0885-8977 (ISSN)

Vol. 31 2 857-866


Annan elektroteknik och elektronik



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