System simulation of a doubly fed induction generator ride-through control for symmetrical grid fault

Using the time domain simulation model which is experimentally verified, a series of case studies on a representative 2MW DFIG wind turbine system is described. In contrast to the scheme of crowbar protection on the rotor side, integration of the proposed grid fault ride-through control with the normal wind power tracking control allows the DFIG to pick up load immediately after fault clearance and hence improves the post-fault stability of the overall power system. The feasibility region of successful ride-through for symmetrical grid faults is obtained by simulation. The result shows that using the proposed control, a typical DFIG system can successfully ride through a symmetrical fault which brings the system side voltage of the generator transformer down to 0.3 pu, at any operating speed. The effects of pre-fault operation point and machine parameters on the effectiveness of the proposed ride-through control strategy are analyzed. Increasing either the leakage inductance or stator side resistance of the DFIG tends to aid grid fault ride-through control.