Dynamic behavior of doubly fed induction generator during network voltage dips

The doubly fed induction generator (DFIG) is one of the mostly used options in variable-speed wind power generation. The present paper deals with the transient behavior of the DFIG during network voltage dips. The dynamic model used for the transient analysis of the DFIG during network disturbances is presented. Vector control strategy is used to ensure independent control of the active and reactive powers. In order to illustrate the behavior of the DFIG during network disturbances, two symmetrical voltage dips are applied the DFIG stator terminals. These voltage dips are both selected within the limits set by the grid codes considered in the present paper. Simulation results showing large transient stator and rotor currents are presented and discussed. Finally, the mostly used technique to ensure a low voltage ride-through capability for the DFIG and to minimize the effects of grid disturbances on the doubly fed induction generator is reviewed.