Systems and methods for controlling wind turbines providing reactive power are provided. In particular, a method for controlling a power system that includes a controller and one or more wind turbines electrically connected to a power grid through a point of interconnection can be provided. The method can include receiving signals from a sensor associated with the wind turbines. The method can also include determining wind turbines that are operating in low wind or no wind operating conditions based, at least in part, on the one or more of the sensor signals. The method can also include determining a reactive power capability of the wind turbines operating in low wind or no wind conditions and generating control signals based, at least in part, on the reactive power capability of the wind turbines. The method can also include controlling an operational state of the wind turbines based on the control signals.