DocumentCode :
1516480
Title :
Minimum-Threshold Crowbar for a Fault-Ride-Through Grid-Code-Compliant DFIG Wind Turbine
Author :
Pannell, Graham ; Atkinson, David J. ; Zahawi, Bashar
Author_Institution :
AC Renewables Ltd., Hexham, UK
Volume :
25
Issue :
3
fYear :
2010
Firstpage :
750
Lastpage :
759
Abstract :
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 11-16 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.
Keywords :
asynchronous generators; fault diagnosis; overcurrent protection; overvoltage protection; power generation economics; power generation protection; wind turbines; conventional converter protection; cost-effective partially rated power converter; doubly fed induction generator wind turbine; fault-ride-through grid-code-compliant; minimum-threshold crowbar; power 7.5 kW; power control; stator voltages; time 11 ms to 16 ms; time 45 ms; variable-speed operation; wind power generation; Circuit faults; Globalization; Induction generators; Power control; Protection; Stators; Voltage control; Voltage fluctuations; Wind power generation; Wind turbines; Doubly fed induction generator (DFIG); induction generators; power conversion; wind power generation;
fLanguage :
English
Journal_Title :
Energy Conversion, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8969
Type :
jour
DOI :
10.1109/TEC.2010.2046492
Filename :
5484719
Link To Document :
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