IMPROVEMENT OF POSITIVE SEQUENCE VOLTAGE IN WIND SYSTEM UNDER UNSYMMETRICAL FAULT

The wind farms which are recently installed are of erratic speed type. Due to the erratic speed and unsymmetrical fault condition the voltage become unbalance. Whenever the voltage sag/swell is present in a system, the induction generator may perhaps consume a bulky quantity of reactive power, the results of progression of faults and voltage collapse is due to the speed deviates as of synchronous speed. Whenever unsymmetrical faults occur in a wind farm, positive sequence voltages are formed. DVR is connected to wind system is investigated using MPPT with synchronous reference frame (SFR) control action as demanded in definite grid code. A new control technique is purposed for recovery of positive sequence voltages under asymmetrical fault and where the system speed is variable.