Vector control makes the wind turbine equivalent to a current source and large-scale wind turbines connected to distributed network decrease voltage stability of grid and lack required inertia. To solve these issues, virtual synchronous generator control strategy for DFIG wind turbines is studied. By means of detailed analysis on the voltage of the point of common coupling (PCC), the impact of the grid impedance on static voltage stability is investigated. A virtual synchronous generator control strategy for DFIG wind turbines regulating frequency and voltage is presented. Studies show that the wind turbine using the virtual synchronous generator control strategy has better voltage instability than that using the current-source control strategy. Furthermore, this control strategy has obvious advantages in the aspects of reducing the surge of generator terminal voltage and providing frequency support for grid. Simulated results verify the feasibility and efficiency of the virtual synchronous generator control strategy. This work is supported by Natural Science Foundation of Shanghai (No. 14ZR1400700).