Abstract: Methods and systems [are disclosed] for controlling wind turbines having a tower, a nacelle, and a rotor with a blade and hub. The wind turbine may further include a yaw drive system for rotating the nacelle relative to the tower about a substantially vertical axis, and/or a pitch drive system for rotating the blade of the rotor around a longitudinal axis of the blade. During high wind speeds when the wind turbine may be in a stand-still and non-power-producing situation, the yaw drive system may continuously or periodically rotate the nacelle to vary a direction of the rotor with respect to the wind. Further, the pitch drive system may continuously or periodically rotate the blade to vary a direction of the blade with respect to the wind. In this manner, the wind turbine may be safely controlled during high winds.

Abstract: For optimising annual energy production in a wind turbine, the invention provides a method by which operation of the turbine in accordance with different pre-specified modes depending on the wind direction towards the turbine is enabled. The modes may include pitch and/or power control strategies. The invention further provides a control system for a wind turbine adapted to operate in accordance with the method, and a wind turbine with such a control system.

Abstract: The invention relates to a method of controlling a wind turbine comprising a tower, a nacelle located on the tower, and a rotor mounted on the nacelle and comprising a hub and at least one blade, the wind turbine further comprising a yaw drive system for rotating the nacelle in relation to the tower about a substantially vertical axis, and/or a pitch drive system for rotating the blade around a longitudinal axis there of the method comprising, during a stand-still, non-power-producing situation of the wind turbine due to high wind speeds, continuously or periodically rotating, by means of the yaw drive system, the nacelle so as to vary the direction of the wind in relation to the rotor, and/or continuously or periodically rotating, by means of the pitch drive system, the blade so as to vary the direction of the wind in relation to the blade.