Design of a high power, resonant converter for DC wind turbines

Catalin Gabriel Dincan, Philip Carne Kjær, Yu-Hsing Chen, Stig Munk-Nielsen, Claus Leth Bak, Eduard Sarra Macia , Sriram Vaisambhayana

Research output: Contribution to journalJournal articleResearchpeer-review

8 Citations (Scopus)

Abstract

This paper presents a design procedure and loss estimation for a high power, medium voltage series resonant converter (entitled SRC#), intended for application in megawatt medium-voltage DC wind turbines. The converter is operated with a novel method of operation, entitled pulse removal technique, characterized by variable frequency and phase shift modulation, below the resonant point of the LC tank. A step by step design procedure is proposed and circuit component ratings and efficiency are compared for two variants. The new method of operation reduces transformer size to below 50% while losses are kept below 1.5% from zero to nominal power, due to soft-switching characteristics. An experimental setup, rated for 10 kW and 5 kV output was assembled to extract losses and validate the semiconductor loss model.
Original languageEnglish
Article number8493299
JournalI E E E Transactions on Power Electronics
Volume34
Issue number7
Pages (from-to)6136 - 6154
Number of pages19
ISSN0885-8993
DOIs
Publication statusPublished - Jul 2019

Keywords

  • Medium-frequency transformer
  • Medium-voltage direct current (MVdc)
  • Offshore wind farm
  • Series resonant circuit (SRC)
  • Sub-resonant mode

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