Control system and method for operating a plurality of wind turbines

A method for operating a first wind turbine (14) and a second wind turbine (15), the second wind turbine (15) being located downwind of the first wind turbine (14), said method comprising:

• providing a current wind value of the first wind turbine (14) to a prediction model (28), said current wind value comprising a current wind speed value or a current wind direction value;
• in said prediction model (28), using the current wind value of the first wind turbine (14) to predict a future time point (25) at which an area swept by a rotor of the second wind turbine (15) overlaps a wake (30) of the first wind turbine (14);
• in response to said prediction, generating a control signal to alter a pitch angle of a rotor blade of the second wind turbine (15) relative to the pitch angle of another rotor blade of the second wind turbine (15) before the future time point (25);
• and
• beginning to adapt the pitch angle of the rotor blades of the second wind turbine (15) to the control signal before the future time point.