Method for operating a wind turbine

A first wind turbine comprising:

• a rotor operable with variable rotor speed and having rotor blades with adjustable pitch angles, the adjustable pitch angles being represented by a common pitch angle;
• and
• a generator configured to generate electrical power from wind, wherein:
• the wind causes a rotor thrust that acts on the rotor and that depends on the rotor speed and the common pitch angle,
• a wind turbine controller is configured to operate the first wind turbine such that in partial load, when the wind is below rated wind speed, the first wind turbine is controlled using a rotor speed curve, defining the rotor speed for a respective operating point of the first wind turbine,
• during the partial load and in a normal operational mode when the operation of the first wind turbine is not throttled, a normal rotor speed curve is used as the rotor speed curve and a normal common pitch angle is used as the common pitch angle, and
• during the partial load and in a throttled operational mode when the rotor thrust is to be limited, a throttled rotor speed curve, different to the normal rotor speed curve, is used as the rotor speed curve and a throttled common pitch angle, different to the normal common pitch angle, is used as the common pitch angle to reduce the rotor thrust.