Method for controlling wind turbines

A method for feeding electrical energy into an electrical supply grid by a wind turbine or wind farm, the method comprising:

• converting, using the wind turbine or wind farm, kinetic energy from wind with variable wind speed to electrical energy,
• predicting a wind speed based on a wind forecast,
• calculating a predicted reactive power to be fed in based on a predicted wind speed that is predicted over a forecast period, the predicted reactive power including a plurality of predicted reactive power values respectively corresponding to a plurality of time instances of the forecast period,
• feeding in, by the wind turbine or wind farm, the predicted reactive power at a point in the forecast period later than calculated, the feeding in including feeding in a predicted reactive power value of the plurality of predicted reactive power values later in the forecast period than a time instance respectively corresponding to the predicted reactive power value, and
• calculating an active power to be fed in as a predicted active power based on the predicted wind speed, and wherein:
• the predicted reactive power is greater than the predicted active power when a wind speed is predicted to be greater than a mean storm wind speed lying between a first wind speed of a storm and a second wind speed of a storm,
• the first wind speed of the storm is a wind speed from which the active power is reduced when the wind speed increases, and
• the second wind speed of the storm is a wind speed at which the active power is no longer fed into the electrical supply grid.