This paper aimed to research the influence of Crowbar circuit to the transient process of power system when double fed induction generator(DFIG) unsuccessfully connected to the power system. Based on the software of MATLAB/Simulink, a wind power grid model connected to the power system was established and the influence of Crowbar circuit resistance and removal time to the ability of low voltage ride through of wind grid was analyzed. The simulation results indicated that proper parameters and removal time o...