Wind turbine and method for controlling the wind turbine using an operating characteristic curve

A method for controlling a wind turbine, wherein the wind turbine includes:

• a tower,
• an aerodynamic rotor operable at a rotor speed that is variable and having a plurality of rotor blades, each blade having an adjustable rotor blade setting angle, and
• a generator configured to generate an output power, and the method comprises:
• during a power supplying operation, operating the wind turbine using a prespecified operating characteristic curve which defines a relationship between the rotor speed and the output power;
• setting the output power to a value of the operating characteristic curve corresponding to a value of the rotor speed, wherein the operating characteristic curve has a starting rotation speed, the starting rotation speed corresponding to a rotor speed at which the generator is controlled to start generating the output power;
• determining, prior to the power supplying operation, the starting rotation speed depending on a tower natural frequency of the wind turbine;
• and
• in response to both the wind turbine starting, by allowing rotation of the rotor, and a sufficient wind speed being reached, increasing the rotor speed to the starting rotation speed.