As the scale of wind farms continues to increase, the impact on the grid of wind turbines connected to the grid is gradually increasing. Therefore, fully exploiting the reactive power and voltage regulation capability of wind turbines and improving their reactive power response speed plays an important role in enhancing the voltage stability of the power system. This paper quantitatively analyzes the reactive voltage regulation capability and limiting factors of a single doubly-fed induction wind turbine in a wind farm in the West Mengxi Power Grid. It formulates a dynamic reactive power compensation coordinated control strategy based on the reactive power regulation mechanism of a single unit. If the system reactive power demand exceeds the DFIG reactive power output limit, on the basis of ensuring the maximum power generation benefit of the unit, an additional active power control based on the reactive power difference is proposed. In addition, the parameters of the additional controller are obtained through an improved genetic control algorithm identification. This control reduces the minimum output of the unit while ensuring the increase of the reactive power limit of the unit. This in turn meets the reactive power demand of the system. Finally, the experiment verifies the feasibility and accuracy of the proposed dynamic reactive power coordinated control of the doubly-fed wind turbines, and it enhances the voltage stability of the generators. This work is supported by the Beijing Natural Science Foundation (No. 3212037).