Temperature Control Based on Weather Forecasting Examples are generally directed to techniques for controlling a temperature of a blade, such as a blade in a wind turbine system. One example of the present disclosure is a method of controlling a temperature of a blade. The method includes inputting current weather conditions and future weather conditions into a processor, generating a first power production, generating a second power production curve based on future weather conditions, comparing the first power production curve to the second power production curve, determining which power production curve minimizes a new power production loss of the blade, and adjusting a heating cycle of the blade based on the power production curve that minimizes the net power productions loss of the blade.

Control methods and systems of a wind turbine belonging to an off-shore wind park that use, in case of malfunction of the load measuring system, one of the following pitch vectors for the calculation of the individual pitch command of each blade: the pitch vector being applied at the same time in one wind turbine of the wind park where the load measuring system works properly a mean value of the pitch vectors being applied at the same time in a group of wind turbines of the wind park where the load measuring system works properly; the pitch vector resulting from a control law, obtained from historic records of the wind turbine when the load measuring system worked properly, defining the pitch vector as a function of at least the wind speed V, if the former pitch vectors are not available.

The present disclosure is directed to a method for reducing loads of one or more rotor blades of a wind turbine. The method includes monitoring a load of a first rotor blade. If the load of the first rotor blade exceeds a first load threshold, the method also includes designating a rotor plane sector in which the first rotor blade is located as a high load rotor plane sector. The method further includes adjusting, via a pitch drive mechanism, a pitch angle of a second rotor blade toward a first position before the second rotor blade enters the high load rotor plane sector.

The invention concerns a method of operating a wind power installation in which the rotor is brought to a halt and fixed, comprising the steps: braking the rotor, positioning the rotor at a stopped position, and fixing the rotor in the stopped position. According to the invention it is provided that an end position is predetermined, the rotor is braked in regulated fashion to a stopped position associated with the end position, and for positioning for the predetermined end position the rotor is braked in an automated procedure until stopped at the stopped position, and for fixing in the stopped position a mechanical fixing device is applied, in particular automatically.

A wind turbine system comprising a nacelle mounted on a tower, a rotor having a plurality of blades and a boundary layer control system configured to control airflow through blade surface openings in each of the blades. The wind turbine system includes a control system configured to perform at least one of the following: to monitor an operational speed parameter of the wind turbine, and to activate the boundary layer control system if it is determined that the 1 operational speed parameter exceeds a predetermined speed parameter threshold; to monitor tower motion and to activate the boundary layer control system based on a determination of excessive tower motion; to monitor for a wind turbine shutdown condition, and to activate the boundary layer control system if it is determined that a wind turbine shutdown condition has been identified; and to monitor the aerodynamic loads on the blades, and to activate the boundary layer control system also based on a determination of excessive blade loads. The system thereby provides an approach to activating and deactivating the boundary layer control system to reduce operational risk to the wind turbine.

A wind turbine comprising: a rotor having a plurality of blades; and a controller. The controller is arranged to independently control each of the plurality of blades and/or one or more components of each blade in order to increase a driving moment of each blade independently of other of the blades when speed of wind acting on the wind turbine is below rated. The controller is also additionally or alternatively arranged to independently control each of the plurality of blades and/or one or more components of each blade independently of other of the blades when wind force acting on the blades is above cut-out in order to reduce a mechanical load experienced by at least a part of the wind turbine.

A method for controlling a wind power installation, wherein the wind power installation has a rotor with a plurality of rotor blades, the rotor blades are adjustable in their blade angle, each rotor blade is activatable individually, for the individual activation, in each case a total adjustment rate R.sub.of which indicates an intended speed of change of the respective blade angle is predetermined, a collective blade angle identical for all of the rotor blades is provided, a collective adjustment rate identical for all of the rotor blades describes an intended speed of change of the collective blade angle, an individual offset angle which indicates a value by which the blade angle is intended to deviate from the collective blade angle is predetermined for each rotor blade, an individual feed forward control adjustment rate which indicates an adjustment rate which is provided for reaching the offset angle is determined for each rotor blade from the individual offset angle, an individual offset deviation is determined for each rotor blade depending on a comparison of the individual offset angle and a detected blade angle of the rotor blade, and the total adjustment rate of each rotor blade is determined depending on the collective blade angle and/or the collective adjustment rate, the individual feed forward control adjustment rate, and the individual offset deviation.

The present invention provides an electromechanical drive system (1) with at least one electromechanical drive unit (2) to actuate a movable component (3). The electromechanical drive unit (2) comprises a drive unit interface 20 for receiving drive unit control signals (DA), an electromechanical motor (21) controlled by actuation signals (AS) to actuate the component (3), a safety module (4) and a position sensor (5) connected to the safety module via a first data connection (51). The position sensor is adapted to monitor (S1) component (3) and/or motor (21) position and/or speed of the actuated component (3) and/or motor (21); where the safety module (4) is connected to the drive unit interface (20) for receiving the drive unit control signal (DA), and where the safety module is connected to the motor control unit (22) via a third data connection (41) to transmit actuation signals (AS) like actuation speed and desired component position to the motor control unit (22) for actuating (A) the component (3). The safety module (4) comprises as a safety function (SF) at least the actuation (A) of the component (3) in a resting or neutral position (FP), whereby the safety module (4) is configured to decide on basis of the sensor data received from the position sensor (5) whether to continue to actuate the component (3) until it has reached its resting or neutral position (FP) or to stop the actuation of the component (3).

An actuator device for a wind power installation, in particular for a rotor blade of a wind power installation, and also to an associated wind power installation and a method of assembly, with an actuator component and a control component, wherein the actuator component has at least one actuator layer with a preferential direction and, substantially parallel to the actuator layer, at least one exciting layer, wherein the actuator layer comprises a photoactuator, wherein the photoactuator is designed to change a strain and/or stress of the actuator layer in the preferential direction on the basis of excitation light, wherein the exciting layer is designed to guide excitation light into the actuator layer, wherein the control component comprises a light source and a light guide, wherein the light source is arranged away from the exciting layer and is connected to the exciting layer by means of the light guide. The actuator device makes it possible to ensure greater operational reliability.

A proactive method and related wind turbine system are provided for reducing vibrations in the rotor blades when the rotor hub is locked against rotation. The method includes determining an initial blade orientation to wind direction and wind parameters for wind impacting the rotor blades. Based on the wind parameters and blade orientation, an angle of attack is determined for the rotor blades that will at least reduce vibrations expected to be induced in the blades from the current wind conditions. With a controller, the rotor blades are pitched to achieve the angle of attack using a pitch control system. The angle of attack is determined and the rotor blades are pitched from the initial blade orientation to the new angle of attack prior to vibrations being induced in the rotor blades.