This paper presents the performance evaluation of wind turbine with doubly-fed induction generator. A stator flux oriented vector control is used for the variable speed doublyfed induction generator operation. By controlling the generator excitation current the amplitude of the stator EMF is adjusted equal to the amplitude of the grid voltage. To set the generator frequency equal to the grid one, the turbine pitch angle controller accelerates the turbine and generator until it reaches the synchronous speed. The system is modeled and simulated in the Simulink software for modeling of all types of induction generator configurations. The model makes use of rotor reference frame using dynamic vector approach for machine model. The results of a single line to ground fault and a symmetrical three-phase ground fault is analyzed. The results show that the wind energy conversion system can normally operate in fault conditions.