Now in wind farm, the load distribution of reactive power compensation devices in parallel operation relys on voltage coordination control system. When the communications among coordination controllers fail, the voltage stability of wind power station is greatly reduced. According to the setting principle of voltage adjustment in excitation system of generator unit, the adjustment coefficient setting is applied to the controlling unit of static var compensator devices in wind farm to achieve the coordination among multiple devices and thus increase the voltage stability. Simulation analysis and field test both verify that the adjustment coefficient has obvious and remarkable effect on coordination control, and can achieve stable operation and quick adjustment of devices. The technology not only can achieve coordination among multiple reactive power devices of wind farm but also can greatly reduce equipment investment and increase economic benefit.