Abstract: A method is disclosed for controlling a wind turbine, where the wind turbine includes with a tower and a rotor and comprises having at least one rotor blade with an adjustable blade pitch angle, and where a change in a power value takes place in a time interval (TE) and by the control of one or more operating parameters which determine power to be fed in by the wind turbine. The method comprises determining a parameterized time function of a tower deflection for the time interval (TE). A series of boundary conditions are defined for the parameterized time function of the tower deflection and a thrust of the rotor of the wind turbine is determined for the parameterized time function of the tower deflection. A function is then calculated for controlling the one or more operating parameters from the thrust of the rotor.

Abstract: A method for operating a wind turbine comprises capturing an actual value of a fed-in power (Pact) and determining a power deviation based on the captured actual value of the fed-in power (Pact). A signal value is set for a correction of a setpoint value for the rotor blade pitch angle when one of the power deviation exceeds a predetermined maximum value and the power deviation exceeds a maximum gradient threshold value over a specified period of time. The signal value is cleared when one of the power deviation falls below a predetermined minimum value and a grid voltage value is located in a predetermined band around a specified target voltage value. A correction value (d?/dt*) is determined for the setpoint value of the rotor blade pitch angle depending on the power deviation and applied to a rotor blade pitch control when the signal value is set.

Abstract: A bushing (116) for a wind turbine rotor blade (104) is provided, the bushing (116) comprising a first bushing end (117) and an opposite second bushing end (118) and a bushing bore (119) which extends in a region between the first bushing end (117) and the second bushing end (118) and comprises a bore longitudinal axis (120); wherein, along the bore longitudinal axis (120) in the direction of the second bushing end (118), the bushing bore (119) comprises a threaded portion (127), and wherein the bushing (116) comprises a bushing runout (128) that follows the threaded portion (127), the bushing runout comprising a widening portion (131) of the bushing bore (119), in which a diameter (132) of the bushing bore (119) enlarges at least monotonically while an increase in diameter decreases at least monotonically.

Abstract: A method for operating a wind turbine comprises capturing an actual value of a fed-in power (Pact) and determining a power deviation based on the captured actual value of the fed-in power (Pact). A signal value is set for a correction of a setpoint value for the rotor blade pitch angle when one of the power deviation exceeds a predetermined maximum value and the power deviation exceeds a maximum gradient threshold value over a specified period of time. The signal value is cleared when one of the power deviation falls below a predetermined minimum value and a grid voltage value is located in a predetermined band around a specified target voltage value. A correction value (d?/dt*) is determined for the setpoint value of the rotor blade pitch angle depending on the power deviation and applied to a rotor blade pitch control when the signal value is set.

Abstract: A method for controlling a wind turbine, where the wind turbine includes a tower and a rotor and comprises at least one rotor blade with an adjustable blade pitch angle. A change in a power value takes place in a time interval (TE) and by control of one or more operating parameters which determine power to be fed in by the wind turbine. The method comprises determining a parameterized time function of a tower deflection for the time interval (TE). A series of boundary conditions are defined for the parameterized time function of the tower deflection. A thrust of the rotor of the wind turbine is determined for the parameterized time function of the tower deflection. A function is calculated for controlling the one or more operating parameters from the thrust of the rotor.

Abstract: A method for examining the raceway of a large roller bearing in a wind turbine, in which a raceway of the large roller bearing is measured using an ultrasonic measuring unit mounted on the bearing housing, wherein the ultrasonic measuring unit detects two edges of the raceway and the relative position and/or formation thereof in relation to one another is measured.

Abstract: A method for controlling an active power output in a wind farm comprises inputting a setpoint of the active power into a ramp and limiting unit to determine an internal active power setpoint. Inputting the internal active power setpoint into a distributing unit configured to calculate a modeled active power setpoint of the wind farm. Determine by a subtraction element, a control difference that is a difference between the modeled active power setpoint and an actual value of the active power output of the wind farm. Determine a controller setpoint variable and calculating an overall setpoint variable from the controller setpoint variable and the feed-forward control variable. Splitting the overall setpoint variable for models of the wind turbines and determining using the wind turbine models the modeled active power setpoint of respective wind turbines depending on a portion of the active power setpoint.

Abstract: A method for operating a wind turbine configured to supply electrical power to an electrical power supply network via a converter comprises measuring a phase angle and measuring a voltage of the electrical power supply network. A value of at least one parameter for a phase locked loop is determined depending on the measured voltage. The phase locked loop is used to determine a corrected phase angle depending on the measured phase angle and the voltage of the electrical power supply network. The corrected phase angle is input into the converter.

Abstract: A method for controlling a wind turbine comprising inputting an actual value of rotational speed and a rotational speed setpoint into a control and outputting a set point value for a generator torque from the control. Inputting the set point value for the generator torque into a limiter with a predefinable upper and lower limit and outputting a limited torque value that is fed into a converter control. Increasing the actual value of the fed-in electrical power by an additional amount of power in response to a boost signal, wherein the fed-in electrical power and the additional amount of power are combined into an aggregated power setpoint value. Determining the set point value for the generator torque from the aggregated power setpoint value and applying the set point value for the generator torque in the boost operation to the limiter both as the upper limit and as the lower limit.

Abstract: The invention is directed to a method for making an equipotential bonding connection between two components of a lightning protection arrangement of a wind turbine rotor blade. The method includes providing a wind turbine rotor blade having two rotor blade half shells having respective connection and fastening units connected to corresponding ones of the two components of the lightning protection arrangement. A space is present in the interior of the rotor blade between the two connection and fastening units. A connection conductor is introduced from outside of the rotor blade through a through opening in one of the two connection and fastening units into the interior space of the wind turbine rotor blade. The two ends of the connection conductor are fastened to corresponding ones of the connection and fastening units such that the connection conductor bridges the interior space along an essentially linear imaginary line.

Abstract: A method for operating a wind turbine includes determining a current temperature of a rotor blade and activating and deactivating a rotor blade heating device in dependence upon the determined current temperature. The current temperature is determined by assuming a temperature starting value and calculating a change in temperature taking into account at least one predefined characteristic variable for the temperature behavior of the rotor blade and at least one operating parameter of the wind turbine.

Abstract: A method for operating a wind turbine includes: determining a value of a wind speed of an incident air mass at the wind turbine; if the determined value of the wind speed is greater than a first threshold value for the wind speed: reducing a rotational speed of a rotor of the wind turbine, and maintaining or increasing a generator torque acting upon the rotor; if the determined value of the wind speed is greater than a second threshold value for the wind speed, the second threshold value being greater than the first threshold value: reducing the rotational speed of the rotor, and reducing the generator torque acting upon the rotor.

Abstract: A device for mounting a line pipe in a rotor shaft of a wind turbine. The invention also relates to a rotor shaft for a wind turbine and to the wind turbine itself. The device includes a rotor shaft which is configured to be partially hollow and in which the line pipe is arranged. In the line pipe, different media are routed from a fixed nacelle of the wind turbine in the direction of a rotor hub connected to the rotor shaft. These can be not only electrical lines but also optical waveguides and media lines for gases and liquids. The mounting of the line pipe is achieved by a device having a plurality of eccentric fixing elements, wherein the line pipe is oriented concentrically by rotating the eccentric fixing elements.

Abstract: A gearbox for a wind turbine, which has at least one first and one second shaft, which are arranged parallel to each other and supported in roller bearings. A preload device for the roller bearings is provided, wherein the preload device generates a preload force between the first and the second shaft and is supported with one end on the shafts in each case.

Abstract: A wind turbine having a rotor, which has at least one rotor blade adjustable about its longitudinal axis via a pitch control, and a generator, driven by the rotor, having a speed regulator, which takes a control difference in the rotational speed and generates a control variable for the pitch control, and a generator regulator, which takes a power conductance and determines a rotational speed setpoint and a power setpoint, wherein a pilot control is provided that uses an inverse controlled system to determine a control variable for the pitch control, the inverse controlled system determining a power torque (MP) from the rotational speed setpoint and the power setpoint and also an acceleration torque (MB) from the change in the rotational speed setpoint over time and outputting the control variable for the pitch control as an output variable that provides pilot control for the output variable from the speed regulator.

Abstract: A method for controlling an active power in a wind farm having at least two wind turbines that supply active power comprises inputting a setpoint value for the active power of the wind farm into a wind farm model. The wind farm model outputs a modeled active power setpoint value. A system deviation is determined and input into a power controller, which outputs a controller manipulated variable. A feedforward control manipulated variable is determined independently of states of the wind farm or the active power. An overall manipulated variable is determined for the wind farm as the sum of the controller manipulated variable and the feedforward control manipulated variable. A correction value is determined based on the difference between the actual value of the active power and the modeled active power setpoint value and input into the wind farm model.

Abstract: A method for operating a wind turbine configured to supply electrical power to an electrical power supply network via a converter comprises measuring a phase angle and measuring a voltage of the electrical power supply network. A value of at least one parameter for a phase locked loop is determined depending on the measured voltage. The phase locked loop is used to determine a corrected phase angle depending on the measured phase angle and the voltage of the electrical power supply network. The corrected phase angle is input into the converter.

Abstract: Wind turbine rotor blade having an electric heating device for heating a heatable surface region which extends over a longitudinal section of the wind turbine rotor blade, wherein the electric heating device has a blade-tip-side end, a blade-root-side end and two profile-trailing-edge-side edges, and two outer electric conductors which are connected to the electric heating device along the profile-trailing-edge-side edges and via which the electric heating device can be supplied with a heating current, wherein at least one central electric conductor which is connected to the electric heating device at a distance from the two profile-trailing-edge-side edges in such a way that the electric heating device is divided by the at least one central electric conductor into at least two partial regions which each extend over the longitudinal section and can be supplied with an electric heating current separately from one another via two of the conductors.

Abstract: A steel tower for a wind turbine, including a plurality of cylindrical and/or conical tower sections arranged one above another in a tower lengthwise direction which are joined together via horizontally running annular flanges, at least one tower section having at least two section pieces, which are welded together along their adjacent, horizontal and annular end faces and are welded to a horizontal annular flange along each of the free uppermost and lowermost end face, and the at least one tower section being divided into a plurality of section segments which are joined together by longitudinal profiles and connecting means to form a circumferential tower section. At least one of the annular flanges has at least two separation sections in which the annular flange is divided into annular flange segments. The at least one annular flange forms a monolithic annular flange prior to a severing of the section segments.

Abstract: A wind turbine rotor blade is provided. The wind turbine rotor blade has a lightning receptor, a first electrical line and a potential equalization arrangement which has a first electrode, which is connected to the lightning receptor, and a second electrode, which is connected to the first electrical line, a spark gap being formed between the two electrodes. The two electrodes are arranged on an outer side of the wind turbine rotor blade and are exposed to the surrounding air flow.