A modular series connected converter structure suitable for a high-voltage direct current transformerless offshore wind turbine

ABSTRACTA modular generator/converter system suitable for a 100 kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator combined with mechanical tolerances may result in substantial parameter deviations. Therefore, the impact of such parameter variations...

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Published inWind energy (Chichester, England) Vol. 17; no. 12; pp. 1855 - 1874
Main Authors Gjerde, S., Ljøkelsøy, K., Nilsen, R., Undeland, T.
Format Journal Article
LanguageEnglish
Published Bognor Regis Blackwell Publishing Ltd 01.12.2014
John Wiley & Sons, Inc
Subjects
DC grid
modular power electronic converter
offshore wind power
transformerless
transformerless, DC grid
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Summary:ABSTRACTA modular generator/converter system suitable for a 100 kV transformerless HVDC offshore wind turbine is analyzed in this paper. The large diameter generator combined with mechanical tolerances may result in substantial parameter deviations. Therefore, the impact of such parameter variations is analyzed. A steady‐state model relating these variations to the imbalances between module DC voltages has been developed. Additionally, the impact of different control strategies was assessed through simulations in EMTDC/PSCAD. Finally, experimental verification of the system performed on a 45 kW laboratory prototype is presented. The theory is developed with the transformerless wind turbine concept in mind but is also applicable to other similar series connected converter topologies.Copyright © 2013 John Wiley & Sons, Ltd.
Bibliography:ArticleID:WE1670
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ISSN:1095-4244
1099-1824
DOI:10.1002/we.1670