Minimum-Threshold Crowbar for a Fault-Ride-Through Grid-Code-Compliant DFIG Wind Turbine

Autor:	Bashar Zahawi, G Pannell, David J. Atkinson
Rok vydání:	2010
Předmět:	Engineering Crowbar Wind power business.industry Induction generator Electrical engineering Energy Engineering and Power Technology Fault (power engineering) Overcurrent Power rating Overvoltage Control theory Grid code Electrical and Electronic Engineering business
Zdroj:	IEEE Transactions on Energy Conversion. 25:750-759
ISSN:	1558-0059 0885-8969
DOI:	10.1109/tec.2010.2046492
Popis:	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.
Databáze:	OpenAIRE
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