Abstract: A method for determining at least one blade misposition of a rotor blade of a rotor of a wind power installation having multiple rotor blades with an adjustable blade angle, wherein the blade misposition describes a blade angle variance of the blade angle of the rotor blade from a reference blade angle, the wind power installation has a nacelle having the rotor and an azimuth adjustment device, wherein a circumferential rotational position of the rotor is referred to as the rotor position, and the azimuth adjustment device has at least one activable azimuth actuator in order to adjust an azimuthal position of the nacelle, comprises the steps of a detection step comprising detecting an azimuthal movement of the nacelle while the at least one azimuth actuator is inactive, and a determination step comprising determining the blade misposition on the basis of the azimuthal movement detected in the detection step.

Abstract: A method for operating a wind power installation, the wind power installation including an aerodynamic rotor having rotor blades of adjustable blade angle, being controlled by an operation control system, and being configured to generate an installation power, comprises activating a blade-angle adaptation routine when an ice accretion situation occurs, when ice accretion on the rotor blades has been detected or is expected, modifying a collective blade angle of the rotor blades using the blade-angle adaptation routine to adapt the rotor blades to an altered aerodynamic situation caused by the ice accretion, in order to increase the installation power, and selecting an aerodynamically improved blade angle as a modified collective blade angle and specifying the aerodynamically improved blade angle as an iced-blade angle.

Abstract: The present disclosure relates to a method of operating a wind turbine, a corresponding wind turbine, a method of controlling a wind farm and a corresponding wind farm. The method comprises the steps of: determining a target maximum active power to be fed by the wind turbine into a power grid, in particular into an electricity power grid; monitoring a current active power fed from the wind turbine into the power grid; determining a reference time period corresponding to the determined target maximum active power; deriving an average of the active power fed from the wind turbine into the power grid during the reference time period; comparing the average of the active power with the target maximum active power; and operating the wind turbine at a set operating point permitting active power above the target maximum active power in case the average of the active power is below the target maximum active power.

Abstract: A method for operating a wind turbine, and the wind turbine comprises a generator for generating electrical power from wind, the generator having a generator axis, a nacelle for supporting the generator, and a tower for supporting the nacelle, the tower having a tower axis, and the method comprises the steps sensing at least one tower vibration by means of a vibration sensor, sensing a mechanical generator vibration, caused by at least one electrical fault, by means of the same vibration sensor, and controlling the wind turbine in dependence on the sensed tower vibration and the sensed generator vibration.

Abstract: A method for controlling a wind power installation, to an associated wind power installation and to a wind farm with a number of wind power installations. The method comprises: providing a wind speed and a direction of incident flow, which are determined by a wind measuring device of the wind power installation, providing a correction value of the direction of incident flow in dependence on the wind speed, carrying out a process of learning the correction value of the direction of incident flow in dependence on the wind speed. The learning process comprises a number of optimizing steps, an execution of the optimizing steps depending on the optimizing steps that have already been carried out for the wind speed provided. Improved tracking of the wind is provided.

Abstract: A method for controlling a wind turbine with rotor blades with an adjustable blade angle, comprising: operating the wind turbine in a part-load operation for wind speeds up to a rated wind speed, operating the wind turbine in a full-load operation for wind speeds above the rated wind speed, with the blade angle being increased in full-load operation with increasing wind speed, setting a limit angle as a minimum value of the blade angle, and controlling the wind turbine in such a way that the limit angle is undershot by at most a predetermined difference angle.

Abstract: Provided is a method for operating wind energy converters, in particular of a wind farm. The power limitation mode in this case comprises the steps of turning off at least one of the wind energy converters and operating at least one wind energy converter different to the turned-off wind energy converter, activating a generator heating of the turned-off wind energy converter, turning off the working wind energy converter at or after occurrence of a predefined event, in particular after a predefined time period has elapsed or when a predefined instant is reached, and activating the generator heating of the wind energy converter turned off at or after the occurrence of the predefined event. Provided is a wind farm and to a wind energy converter for carrying out such a method.

Abstract: A method for controlling a wind turbine having rotor blades with an adjustable blade angle, comprising the steps operating the wind turbine in a partial load mode for wind velocities up to a nominal wind velocity, wherein in the partial load mode, a fixed partial load angle is provided for the blade angle, operating the wind turbine in a full load mode for wind velocities above the nominal wind velocity, wherein in the full load mode the blade angle is enlarged with increasing wind velocity and has values above the partial load angle, and wherein in the partial load mode, starting from a predetermined operating state, the blade angle is reduced as compared with the partial load angle.

Abstract: A method for controlling a wind turbine with rotor blades with an adjustable blade angle, comprising: operating the wind turbine in a part-load operation for wind speeds up to a rated wind speed, operating the wind turbine in a full-load operation for wind speeds above the rated wind speed, with the blade angle being increased in full-load operation with increasing wind speed, setting a limit angle as a minimum value of the blade angle, and controlling the wind turbine in such a way that the limit angle is undershot by at most a predetermined difference angle.

Abstract: Provided is a method for operating wind energy converters, in particular of a wind farm. The power limitation mode in this case comprises the steps of turning off at least one of the wind energy converters and operating at least one wind energy converter different to the turned-off wind energy converter, activating a generator heating of the turned-off wind energy converter, turning off the working wind energy converter at or after occurrence of a predefined event, in particular after a predefined time period has elapsed or when a predefined instant is reached, and activating the generator heating of the wind energy converter turned off at or after the occurrence of the predefined event. Provided is a wind farm and to a wind energy converter for carrying out such a method.

Abstract: A test method for testing a behavior of a wind farm in response to a frequency event is provided. The wind farm has wind power plants, which supply electrical power to a grid which has a grid voltage and with a grid frequency. Each plant has a frequency mode in which the supplied power is temporarily modified per the grid frequency if a frequency event occurs. In a farm testing mode, if a frequency event occurs, each plant changes its frequency mode and the frequency modes are simultaneously tested to test the behavior of the farm. Each frequency mode uses a test frequency function emulating a frequency event, instead of a measured frequency, and the frequency modes are coordinated such that the plants controlled by a common time start command, start their frequency modes simultaneously, and an identical test frequency function is defined for each of the plants.

Abstract: A method for controlling a wind power installation, to an associated wind power installation and to a wind farm with a number of wind power installations. The method comprises: providing a wind speed and a direction of incident flow, which are determined by a wind measuring device of the wind power installation, providing a correction value of the direction of incident flow in dependence on the wind speed, carrying out a process of learning the correction value of the direction of incident flow in dependence on the wind speed. The learning process comprises a number of optimizing steps, an execution of the optimizing steps depending on the optimizing steps that have already been carried out for the wind speed provided. Improved tracking of the wind is provided.

Abstract: A method for feeding electric energy into an electric power supply network by means of a wind turbine, wherein the wind turbine generates electric power from wind having a variable wind speed by means of an aerodynamic rotor and a generator and feeds it at least partially into the electric power supply network and/or uses it at least partially for supplying electric devices of the wind turbine, wherein the generated electric real power is set as function of an ambient temperature and/or wherein the rotor has a variable rotational speed and the rotational speed is set as a function of the ambient temperature.

Abstract: A method for controlling a wind turbine having rotor blades with an adjustable blade angle, comprising the steps operating the wind turbine in a partial load mode for wind velocities up to a nominal wind velocity, wherein in the partial load mode, a fixed partial load angle is provided for the blade angle, operating the wind turbine in a full load mode for wind velocities above the nominal wind velocity, wherein in the full load mode the blade angle is enlarged with increasing wind velocity and has values above the partial load angle, and wherein in the partial load mode, starting from a predetermined operating state, the blade angle is reduced as compared with the partial load angle.

Abstract: A method of operating a wind power installation is disclosed. In the method, a network frequency of an electrical network is measured and an amount of power delivered to the electrical network is controlled by at least maintaining the amount of power delivered without changing the power when the network frequency is between a rated frequency for the electrical network and a deadband frequency. Further, the amount of power is increased by a first amount when the network frequency is between the deadband frequency and a control-band frequency, whereby the first amount is proportional to a difference between the network frequency and the deadband frequency. In addition, the amount of power delivered is increased by a second amount when the network frequency is less than the control-band frequency. The second amount is a preset amount of power that is determined based on a difference between the control-band and deadband frequencies.

Abstract: A method for operating a wind farm with a number of wind power installations is provided. Each wind power installation respectively has a nacelle with an aerodynamic rotor with one or more rotor blades and a generator. Each of the wind power installations is variable in its azimuth position and at least two of the wind power installations are so close together that, depending on the direction of the wind, they can influence one another by way of the wind. At least a first of the wind power installations is cut back in dependence on its azimuth position in order to positively influence the wind for a further wind power installation arranged downwind of the first.

Abstract: The present invention concerns a method of controlling a wind power installation connected to an electric network having a generator with an aerodynamic rotor with an adjustable rotary speed, in which the wind power installation can be operated at an operating point which is optimum in relation to prevailing wind conditions at an optimum rotary speed, wherein the wind power installation is operated for a transitional period of time or lastingly at a non-optimum operating point at a non-optimum rotary speed and the non-optimum rotary speed is higher than the optimum rotary speed.

Abstract: The invention relates to a method for operating at least a first wind turbine including the steps of: recording a tower oscillation, initiating a measure to reduce oscillation if the tower oscillation is or contains a longitudinal oscillation, and if the amplitude of the longitudinal oscillation exceeds a predefined threshold value, and the measure for reducing the oscillation comprises freezing the current pitch angle at the current value for a predefined freezing period, switching the pitch control algorithm used, in particular in such a way that the control speed is reduced, adjusting the yaw position by a predefined yaw angle, switching the operation of the first wind turbine from a first operating mode based on a first power curve to a second operating mode based on a second power curve, and/or if, with regard to the current wind direction, the first wind turbine in a wind park is located behind a second wind turbine, adjusting the rotational speed of the first wind turbine to the rotational speed of the

Abstract: A method of operating a wind power installation selectively in a first or second operating mode is disclosed. In the first operating mode, the installation generates as much electrical power as possible based on the prevailing wind and design of the wind power installation, and in the second operating mode generates less electrical power than in the first operating mode. The wind power installation is controlled in the first and second operating modes with first and second adjustment parameter sets, respectively. When the installation is operated in the second operating mode the maximum power which can be generated with the first adjustment parameter set or a differential power between the maximum power and a power currently generated in the second operating mode may be ascertained. The second adjustment parameter set may be selected based on a desired power reduction and the maximum power.

Abstract: A method for feeding electric energy into an electric power supply network by means of a wind turbine, wherein the wind turbine generates electric power from wind having a variable wind speed by means of an aerodynamic rotor and a generator and feeds it at least partially into the electric power supply network and/or uses it at least partially for supplying electric devices of the wind turbine, wherein the generated electric real power is set as function of an ambient temperature and/or wherein the rotor has a variable rotational speed and the rotational speed is set as a function of the ambient temperature.