Abstract: A method of handling a wind turbine is provided including a nacelle coupled via a yawing system to a tower for protection against high wind load, the method including: supplying a control signal to a yawing actuator of the yawing system, while the nacelle is in a first orientation; exerting, by the yawing actuator, a torque to the nacelle relative to the tower, thereby turning the nacelle to a second orientation being a downwind orientation.

Abstract: Provided is a method of correcting a measurement value of least one wind characteristic, in particular wind speed and/or wind direction, related to a wind turbine having a rotor with plural rotor blades at least one having an adaptable flow regulating device installed, the method including: measuring a value of the wind characteristic; obtaining state information of the adaptable flow regulating device; and determining a corrected value of the wind characteristic based on the measured value of the wind characteristic and the state information of the adaptable flow regulating device.

Abstract: A method of controlling a wind turbine, wherein the wind turbine includes a hub having at least one blade with at least one an add-on member which is actuated to alter aerodynamic properties of the blade. The method includes a step of acquiring a target noise level, and a step of controlling the at least one add-on member of the blade such that an actual noise level caused by the operation of the wind turbine is equal to or below the target noise level.

Abstract: A method of controlling a pitching system of a rotating rotor blade of a wind turbine includes: controlling the pitching system such that unintended pitching due to gravity is reduced.

Abstract: Provided is a method of controlling at least one wind turbine in case of a rotational overspeed situation, the method including: determining a current state related to the wind turbine; providing data related to the current state as input to a turbine model; predicting a load of at least one wind turbine component and power output of the wind turbine using the turbine model provided with the input for plural control strategies; comparing the predicted load and power output for the plural control strategies; and selecting that control strategy among the plural control strategies that satisfies a target criterion including the load and the power output.

Abstract: A control system for stabilizing a floating wind turbine is connected to at least one sensor and at least one actuator of the floating wind turbine and configured for: determining a difference between the floater orientation and a predefined desired floater orientation of the floating wind turbine during towing of the floating wind turbine, actuating the at least one actuator during towing of the floating wind turbine for changing the floater orientation of the wind turbine to minimize the difference.

Abstract: A method for controlling the rotor speed of a floating wind turbine including a floating foundation, a tower, a nacelle and a wind rotor having at least one wind blade includes the steps of: identifying a plurality of critical frequencies of the floating wind turbine, calculating a first plurality of critical rotor speeds of the wind rotor respectively corresponding to each critical frequency, calculating at least a second plurality of critical rotor speeds of the wind rotor by dividing each critical rotor speed of the first plurality of critical rotor speeds by a frequency coefficient, for each calculated critical rotor speed being lower than a maximum operational speed of the wind rotor defining a critical speed interval including the respective critical rotor speed, and operating the wind rotor at an operative rotor speed outside each defined critical speed interval.

Abstract: Provided is a device and a method of damping front and backward movements of a tower of a wind turbine, wherein the wind turbine includes the tower and a rotor, the rotor being mounted at the top of the tower to rotate about a rotational axis in which the front and backward movements of the tower occur, and the rotor has a plurality of blades, wherein each blade has at least one corresponding active add-on member which is actuated by a corresponding actuator to alter aerodynamic properties of the blade. Each add-on member is actuated by the corresponding actuator to alter the aerodynamic properties of the blade in a manner that the rotor is configured to damp the front and backward movements of the tower of the wind turbine.

Abstract: A method of controlling at least one adaptable airflow regulating system, in particular spoiler and/or flap, of at least one rotor blade of a wind turbine having a wind turbine tower includes: determining a quantity related to a distance between the rotor blade and the wind turbine tower; controlling the airflow regulating system based on the quantity.

Abstract: It is described a method of operating at least one adaptable airflow regulating system (13) of at least one rotor blade (15) of a wind turbine (1) connected to a utility grid (6), the method comprising: receiving information (10) regarding a grid disturbance; adapting, in particular during a disturbance duration, the airflow regulating system (13) based on the information (10), while the wind turbine (1) stays connected to the utility grid (6).

Abstract: A method of controlling a wind turbine by adjusting a blade pitch angle and at least one blade add-on of at least one wind turbine rotor blade has the blade add-on, the method including: adjusting a setting of the add-on to meet a control objective while temporarily maintaining a setting of the blade pitch angle.

Abstract: A method of controlling a wind turbine, wherein the wind turbine includes a hub having at least one blade with at least one an add-on member which is actuated to alter aerodynamic properties of the blade. The method includes a step of acquiring a target noise level, and a step of controlling the at least one add-on member of the blade such that an actual noise level caused by the operation of the wind turbine is equal to or below the target noise level.

Abstract: A sensor system for a floating wind turbine is provided. The sensor system includes a wind sensor configured to provide a wind sensor signal indicative of a wind flow; and a processing unit configured to receive the wind sensor signal and to determine, based on the wind sensor signal, information indicative of a spatial arrangement of a floating base of the floating wind turbine relative to an environment of the floating wind turbine. Furthermore, a corresponding floating wind turbine and method of operating a floating wind turbine are provided.

Abstract: A wind turbine includes tower, a nacelle mounted at the top of the tower, a rotor mounted rotatable relatively to the nacelle about a rotation axis and includes at least one blade, wherein the blade, when rotating about the rotation axis, is configured to span a swept area, and a control device which is configured to control an actuator so as to move the swept area.

Abstract: Provided is a control system for stabilizing a floating wind turbine, the comprising a detection device for monitoring an offset from a predetermined floater pitch angle and/or an offset from a predetermined floater yaw angle, wherein the detection device is further configured for monitoring an oscillating motion of the floater pitch angle and/or the floater yaw angle, wherein the predetermined floater pitch angle and floater yaw angle define a predetermined balanced state of the floating wind turbine, wherein a threshold of the oscillating motion of the floater pitch angle and the oscillating motion of the floater yaw angle further define the predetermined balanced state of the floating wind turbine, and an actuation device configured for manipulating the oscillating motion of the floater pitch angle and/or the oscillating motion of the floater yaw angle until the predetermined balanced state of the floating wind turbine is met.

Abstract: A control system for stabilizing a floating wind turbine is provided. The control system includes a measuring device configured for measuring a wind field and a wave field, a determining device wherein the determining device is configured for determining an excitation frequency spectrum of the floating wind turbine on the basis of the measured wind field and/or the wave field and/or a current floater pitch angle of the floating wind turbine, and wherein the determining device is further configured for determining a balanced state of the floating wind turbine, wherein in the balanced state a natural frequency is outside of the excitation frequency spectrum and/or the current floater pitch angle is equal to a pre-defined floater pitch angle. The control system further includes an adjustment device which is configured for manipulating the current floater pitch and/or the natural frequency until the balanced state is met.

Abstract: Provided is a method of controlling a wind turbine during damping a mechanical oscillation of the wind turbine having a generator system coupled to a rotor at which plural rotor blades are mounted, the method including: generating a damping control signal in dependence of an indication of the oscillation; performing damping control of the generator system based on the damping control signal causing damping related power output variation at an output terminal of the generator system; and controlling an energy storage device connected to the output terminal of the generator system and connected to an output terminal of the wind turbine based on the damping control signal.

Abstract: Provided is a control system for operating a floating wind turbine under sea ice conditions. The control system includes a detection device configured for detecting a formation of ice in a critical zone around the floating wind turbine, and an ice inhibiting device configured for manipulating the floating wind turbine in such a manner that the critical zone is free of a threshold amount of the detected formation of ice. Furthermore, a floating wind turbine is provided which includes a wind rotor including a wind rotor including a blade, a tower, a floating foundation, and an above-described control system. Additionally, a method for operating a floating wind turbine under sea ice conditions is provided.

Abstract: A control system for positioning at least two floating wind turbines in a wind farm is provided. The control system includes a measuring device configured for measuring an incoming wind field at the two wind turbines, a determining device, wherein the determining device is configured for determining a wake property at the two wind turbines, wherein the determining device is configured for determining a propagation path of the wake property through the wind farm based on the determined wake property at the at least two floating wind turbines, wherein the determining device is configured for determining a location for each of the at least two floating wind turbines including a minimized wake influence based on the determined propagation path of the wake property through the wind farm, and a repositioning device configured for repositioning each of the at least two floating wind turbines to the determined location.

Abstract: Provided is a method of determining a wind parameter value for use in a wind turbine control system, the method including (a) receiving a plurality of wind measurement signals, wherein each wind measurement signal is provided by a respective wind sensor among a plurality of wind sensors, (b) determining a set of statistical values based on the wind measurement signals, (c) calculating a weighting factor for each wind measurement signal based on the set of statistical values, and (d) calculating the wind parameter value as a weighted sum by applying the calculated weighting factors to the corresponding wind measurement signals. Further, a corresponding system and a wind turbine with such a system are provided.