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In general, a wind farm composed of a wind turbine can control the exchange of reactive power between its wind farm outlet and the grid, that is, the entire wind farm does not emit or consume reactive power. Therefore, the reactive power loss of the wind farm of the doubly-fed wind turbine is only the reactive load of the system. Compared with the wind farm of the asynchronous wind turbine, the reactive power consumption of the wind farm of the doubly-fed wind turbine becomes smaller, and the voltage stability is obvious. Better than asynchronous wind turbine wind farms, the reactive power voltage control ability of the grid is weaker than that of synchronous generators. Therefore, when a part of the wind power in the power grid replaces the thermal power generation, the voltage stability of the power grid will be reduced, and the degree of reduction will depend on the reactive power reserve of the thermal power unit in the power grid. In this paper, the wind turbine is connected to the power grid as the research object. According to the voltage characteristics analysis after the wind power is connected to the power grid, the electrical characteristics and its influence in the wind farm are studied. Based on this, the equivalence modeling of the wind farm is proposed.