Minimum-threshold crowbar for a fault-ride-through grid-code-compliant DFIG wind turbine

Graham Pannell, David J. Atkinson, Bashar Zahawi

Research output: Contribution to journalArticlepeer-review

329 Scopus citations


Doubly fed induction generator (DFIG) technology is the dominant technology in the growing global market for wind power generation, due to the combination of variable-speed operation and a cost-effective partially rated power converter. However, the DFIG is sensitive to dips in supply voltage and without specific protection to ride-through grid faults, a DFIG risks damage to its power converter due to overcurrent and/or overvoltage. Conventional converter protection via a sustained period of rotor-crowbar closed circuit leads to poor power output and sustained suppression of the stator voltages. A new minimum-threshold rotor-crowbar method is presented in this paper, improving fault response by reducing crowbar application periods to 1116 ms, successfully diverting transient overcurrents, and restoring good power control within 45 ms of both fault initiation and clearance, thus enabling the DFIG to meet grid-code fault-ride-through requirements. The new method is experimentally verified and evaluated using a 7.5-kW test facility.

Original languageBritish English
Article number5484719
Pages (from-to)750-759
Number of pages10
JournalIEEE Transactions on Energy Conversion
Issue number3
StatePublished - Sep 2010


  • Doubly fed induction generator (DFIG)
  • Induction generators
  • Power conversion
  • Wind power generation


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