Avoiding resonance in wind turbines

A method for preventing mechanical oscillation in a wind power plant, the method comprising the steps of determining wind speed, controlling a generator of the power plant with speed control when the wind speed is below a predefined limit (w 1 ) to maintain the rotation speed of the generator below a predefined first limit (v 1 ), detecting the increase of wind speed above the predefined limit (w 1 ), controlling the electric drive of the wind power plant generator to torque control by using a predefined crossover torque (T 1 ) in response to the wind speed increasing above a predefined limit, maintaining the crossover torque (T 1 ) as the reference torque for the electric drive until the rotation speed of the generator has increased above a predefined second limit (v 2 ), and controlling the electric drive of the wind power plant generator with torque control while the rotation speed of the generator remains above the predefined second limit (v 2 ).