When failures occurred in the wind farm side of the VSC-HVDC system, the grid voltage of wind farm was too low, leading to the typical tripping events of wind turbines. However, traditional DFIG uses Crowbar technology, the rotor side converter (RSC) is short circuited and the stator side of wide turbine loses its ability of providing reactive power for grid during the failures, the low voltage ride through ability of DFIG is low. This paper presents a new improved model of DFIG using active DC-Chopper to match the Crowbar. The RSC is controlled to make the stator side of wide turbine provide part of reactive power in a failure. Reactive power coordinated control strategy of the improved DFIG and VSC-HVDC is adopted, which improves voltage stability of system. The simulation results demonstrate that when the failure is serious, the improved type of DFIG Crowbar does still not act, so as to reduce the probability of the Crowbar action, and RSC can still provide reactive power support to grid. Reactive power coordinated control strategy of the two sides’ converters and wind farm side of VSC-HVDC (WFVSC) makes the wind farm have a better ability of low voltage ride through.