Design of a modular, high step-up ratio DC–DC converter for HVDC applications integrating offshore wind power

Yihua Hu, Rong Zeng, Wenping Cao, Jiangfeng Zhang, Stephen J. Finney

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High power and high voltage gain DC-DC converters are key to high-voltage DC (HVDC) power transmission for offshore wind power. This paper presents an isolated ultra-high step-up DC-DC converter in matrix transformer configuration. A flyback-forward converter is adopted as the power cell and the secondary side matrix connection is introduced to increase the power level and to improve fault tolerance. Because of the modular structure of the converter, the stress on the switching devices is decreased and so is the transformer size. The proposed topology can be operated in column interleaved modes, row interleaved modes and hybrid working modes in order to deal with the varying energy from the wind farm. Furthermore, fault tolerant operation is also realized in several fault scenarios. A 400-W DC-DC converter with four cells is developed and experimentally tested to validate the proposed technique, which can be applied to high-power high-voltage DC power transmission.
Original languageEnglish
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Early online date22 Dec 2015
Publication statusE-pub ahead of print - 22 Dec 2015


  • DC-DC converter
  • HVDC
  • high step up
  • matrix transformer
  • topology

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