Open AccessA modular series connected converter structure suitable for a high‐voltage direct current transformerless offshore wind turbine
Author(s) -
Gjerde S.,
Ljøkelsøy K.,
Nilsen R.,
Undeland T.
Publication year - 2014
Publication title -
wind energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 92
eISSN - 1099-1824
pISSN - 1095-4244
DOI - 10.1002/we.1670
Subject(s) - offshore wind power , turbine , high voltage direct current , modular design , wind power , direct current , current (fluid) , series (stratigraphy) , electrical engineering , voltage , engineering , marine engineering , computer science , aerospace engineering , geology , paleontology , operating system
A 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.