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Doubly Fed Induction Generator (DFIG) system is subject to high transient voltage at rotor side when there is voltage sag at stator/grid side, which is beyond the capability of rotor side converter to handle. Traditional approach is to apply crowbar circuit to shunt the transient rotor current from the rotor side converter. DC-link brake is also typically applied to suppress the rise in DC bus voltage...
This paper analyzes the effect of the variation of machine parameters on flux observers in the steady-state condition by the frequency-domain method. Both the flux estimation and the torque estimation are evaluated. The frequency response function (FRF) expressed by the ratio of the estimated flux/torque to the corresponding physical one is derived to evaluate the parameter sensitivity. The flux observers...
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