Ride-through capability of grid-connected brushless cascade DFIG wind turbines in faulty grid conditions-A comparative study

I. A. Gowaid, Ayman S. Abdel-Khalik, Ahmed M. Massoud, Shehab Ahmed

Research output: Contribution to journalArticle

21 Citations (Scopus)


Doubly-fed induction generator (DFIG)-based wind turbines (WTs) are reported to suffer reliability problems due to the presence of slip-rings, brushes, and the gearbox. These disadvantages encouraged several research groups to investigate the viability of employing single or double-frame brushless cascade DFIGs (BCDFIGs) in grid-connected multimegawatt WTs especially offshore and in solar chimney power plants. In this regard, this paper tackles three main issues. Initially, the expected reduction in gear ratio when BCDFIGs are used instead of DFIGs is examined from a steady state perspective. A reduction would lead to less frequent maintenance and an improved return on investment. Next, a detailed comparison between DFIG-WTs and BCDFIG-WTs under unbalanced grid voltage is presented. Finally, the extent to which a multimegawatt BCDFIG-WT is grid code compliant in terms of fault ride-through capability is studied. This is illustrated by comparing and quantifying the response of a DFIG-WT and a BCDFIG-WT to a severe three-phase voltage dip. Simulation and experimental results indicate promising behavior for BCDFIGs during disturbances.

Original languageEnglish
Article number6529185
Pages (from-to)1002-1015
Number of pages14
JournalIEEE Transactions on Sustainable Energy
Issue number4
Publication statusPublished - 30 Sep 2013



  • Brushless doubly-fed induction generator (BDFIG)
  • fault-ride through (FRT)
  • grid-fault response
  • variable speed wind turbines (WTs)
  • wind power generation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

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