The rapid development of wind farms integrated into power systems is severely impacted by the frequently occurring accidents of large-scale wind turbine generators cascading trip-off.Despite the fact that the Crowbar protection circuit is a commonly used method of improving the low voltage ride-through（LVRT）ability of the doubly-fed induction generators，worsening of the district grid voltage stability will result from large-scale Crowbar switching application.This paper presents a new method of suppressing wind turbine generators cascading trip-off based on Crowbar protection for reducing the cost of wind turbine generators trip-off during low voltage stage，and coordinated control of high-voltage direct-current（HVDC）modulation and AC emergency voltage control.The remarkable effect of this method is verified by time domain simulation results of a real power system.