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© P. Kundur

WTG -  13

Performance of DFIG cont'd

Large disturbances lead to large initial fault currents, both at the stator and rotor

will flow through rotor-side converter; voltage source converters are less tolerant of high currents

further, additional energy goes into charging the dc bus capacitor and dc bus voltage rises rapidly

crowbar may be activated

may lead to tripping of the unit

Need for a careful assessment and proper design of controls to improve capability to ride through faults

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