METHOD FOR OPERATING A WIND TURBINE

Provided is a method for operating a wind turbine that includes a rotor operable with variable rotor speed and having rotor blades with adjustable pitch angles. Wind causes a rotor thrust acting on the rotor depending on the rotor speed and depending on a common pitch angle. In partial load, when the wind is below rated speed, the turbine is controlled by a rotor speed curve, defining the rotor speed for each operating point of the turbine. In a normal mode when the operation of the turbine is not throttled, a normal rotor speed curve in combination with a normal common pitch angle is used, and in a throttled mode when the thrust is to be limited, a throttled rotor speed curve, different from the normal rotor speed curve, in combination with a throttled common pitch angle, different from the normal common pitch angle, is used to reduce the thrust.