Based on double fed induction generator (DFIG) wind power system model, by analyzing the grid voltage drop under various operational performance, this paper proposes the use of Active Crowbar Circuit and DC-chopper in order to protect the converter and avoid DC-link over-voltages during grid serious faults. Crowbar circuit being into again makes the demand of the reactive power increase during the recovery of the grid voltage; grid-side converter (GSC) in the range of power capacity, a new control strategy for GSC reactive power is proposed to achieve the reactive power support to help the recovery of the grid faults and the stator voltage. Simulation system model is built by using PSCAD/EMTDC and the validity of the proposed control strategy is proved. The control strategy meets low voltage ride through (LVRT) of DFIG, and effectively improves the reliability of the DFIG operation.