Abstract: A wind turbine comprising a tower and a nacelle which is rotatably mounted on the tower and whose alignment is adjustable by means of a yaw system, wherein the yaw system has at least one adjusting drive, a rotatable yaw bearing, at least one brake disk and at least two brake units which can exert a braking torque on the brake disk, wherein the at least one of the brake units has a first brake pad with a first coefficient of friction, and at least one of the brake units has a second brake pad with a second coefficient of friction, wherein the first and the second coefficient of friction are different from each other.

Abstract: A method for operating a wind turbine with a variable speed rotor, a control system and a safety system, including the steps of initiating a braking procedure of the rotor of the wind turbine by the control system when the rotational speed of the rotor exceeds a first threshold value (nc1), and activating a safety system for braking the rotor when the rotational speed of the rotor exceeds a second threshold value (ns1) and when the control system has not initiated a braking procedure, the second threshold value (ns1) being greater than the first threshold value (nc1).

Abstract: Method for assembling a rotor blade for a wind turbine, wherein the rotor blade has a first half shell, a second half shell and at least one shear web running in the longitudinal direction of the rotor blade.

Abstract: Method for operating a wind energy plant having a doubly-fed asynchronous machine, a grid-sided converter and a generator-sided converter both being controlled by a control means, the method comprising the following steps: in a regular operating mode the converters are controlled by the control means by means of command variables, in case of fault the converters are controlled by at least one control module which controls the torque and/or the active power and the reactive current and/or the reactive power by means of command variables such that a disconnection of the asynchronous machine from the grid will be performed only if the grid voltage falls below a predetermined voltage-time-characteristic curve, wherein the shape of the voltage-time-characteristic curve is configured by a plurality of pre-selectable parameters in the at least one control module.

Abstract: The present invention is related to a method for controlling a wind energy park with plural wind energy plants and plural control units, which perform control tasks in the wind energy park, comprising the following steps: a) one priority at a time is assigned to the control units, depending on the control tasks they must perform, b) during the operation of the wind energy park, the control units communicate continuously with each other and/or with a central communication unit, c) in case that a failure of a first control unit of the wind energy park takes place, a second control unit of the wind energy park takes over the control tasks of the defective control unit, wherein the second control unit is selected depending on the priority assigned thereto and has the same as or a lower priority than the defective control unit.

Abstract: A method for operating a wind energy plant having a doubly-fed asynchronous machine, a grid-sided converter and a generator-sided converter both being controlled by a control means. In a regular operating mode the converters are controlled by the control means by means of command variables for the regular operating mode.

Abstract: A method for operating a wind energy plant with a rotor having rotor blades which have an adjustable blade pitch, characterized in that the adjustment of the blade pitch takes place with an adjustment velocity and/or an adjustment acceleration, wherein the magnitude of the adjustment velocity and/or the magnitude of the adjustment acceleration is depending from a desired value and an actual value of the blade pitch.

Abstract: A wind energy plant with a rotor hub housing, which is connectable to at least one pitch bearing via joining means, and with at least one rotor blade, the blade root of which is connected to the pitch bearing, wherein a stiffening element is provided, which is fastened between the pitch bearing and the rotor hub housing.

Abstract: A rotor blade for a wind turbine comprising at least one pair of girders lying opposite each other which extend in the longitudinal direction of the rotor blade and carry forces acting on the rotor blade, and at least one shear web which has two front surfaces, each of which is facing one of the two girders, and two lateral surfaces, wherein that shear web extends between the two girders in the longitudinal direction of the rotor blade and is permanently joined to the two girders, wherein at least one connecting profile having a single- or multi-piece cross-section is running in the longitudinal direction of the rotor blade and comprises a collet, into which the at least one shear web is inserted, wherein a first surface of the connecting profile is glued to one of the girders and a second surface of the connecting profile is glued to a lateral surface of the at least one shear web.

Abstract: A method for operating a device to vary a blade setting angle on a rotor blade of a wind power plant, comprising two variable drives each per rotor blade, a bearing element acting between the rotor blade and rotor hub which has a freely rotatable bearing ring, wherein the method has the following process steps: setting the bearing ring into a permanent rotation by a first drive, and adjusting the setting angle of the rotor blade by a second drive.

Abstract: A method of operating a wind turbine, comprising the steps of measuring a meteorological value and using the measured meteorological value to preset a desired value for the turbine operation, to select an operation condition and/or to determine a boundary condition for the turbine operation, wherein the measured meteorological value is an air mass flow caused by the wind.

Abstract: Method for the emergency braking of a wind power plant, in which at least one rotor blade of the wind power plant is adjusted into its feathering position, wherein a first phase, in which the at least one rotor blade is adjusted with a first speed, and a second phase, in which the at least one rotor blade is adjusted as of a predetermined first blade pitch angle with a second speed, which is increased until a maximum speed is reached and/or until a second determined blade pitch angle is reached.

Abstract: A method for the operation of a wind energy plant with a double-fed asynchronous generator which has a mode of operation as a phase shifter, in which reactive power is fed into the electric power supply grid, the method having the following steps: the stator of the asynchronous generator is short-circuited, the asynchronous generator is run-up to a predetermined rotational speed from a working rotational speed range via a converter after running up, the short-circuit in the stator is cancelled, the double-fed asynchronous generator is synchronized with the electric power supply grid, and it is driven for the generation of reactive power.

Abstract: A method for running in a drive train component of a wind energy plant, wherein the wind energy plant has an operation management which can control at least one operational variable B significant for the strain of the drive train component to a desired value BS, wherein after starting up the drive train component, the desired value BS is limited by a maximum value BMax, which is preset depending on a yield value W which describes the yield of the wind energy plant achieved since starting up the drive train component.

Abstract: The present invention is related to a rotor blade for a wind energy plant, with a blade root, with a first longitudinal portion starting from the blade root, with a second longitudinal portion, following up the first longitudinal portion and running into a blade tip, with a first surface, facing a tower of the wind energy plant in its assembled state, and a second surface, facing away from the tower of the wind energy plant in its assembled state, wherein an imaginary reference plane is spanned up by a rotation, taking place in the operation of the rotor blade, of the longitudinal axis of the first longitudinal portion around the rotational axis of a rotor of the wind energy plant carrying the rotor blade which prevents collisions of the blade tip with the tower of the wind energy plant.

Abstract: The present invention is related to a method for determining a characteristic curve (9) for an electric variable (Pel, Q, ?, cos ?, IP, IQ) of a wind energy plant (1). According to the present invention, it is provided that at least one characteristic value of the electric variable (Pel, Q, ?, cos ?, IP, IQ) is measured for at least one value of the wind (vW), and for the at least one value of the wind (vW), a characteristic value of the electric variable (Pel, Q, ?, cos ?, IP, IQ) is adapted from a predetermined characteristic curve (7) containing characteristic values of the electric variable (Pel, Q, ?, cos ?, IP, IQ) as a function of different values of the wind (vW), taking into account the characteristic value measured for the at least one value of the wind (vW).

Abstract: A wind farm with plural wind turbines which are connectible to a farm grid that is in turn connectible to an electricity supply mains via a connection point, wherein the wind farm features the following: a central control system, which determines a correction value for a local desired value for one or plural wind turbines by way of a first regulator, depending on an actual value of an electric variable before or after the connection point, and a turbine control for at least one wind turbine, which determines a local desired value for an electric variable to be generated by the wind turbine by way of a second regulator, depending on an actual value of an electric variable measured in the farm grid, wherein the turbine control determines the sum of the local desired value and the correction value as the total desired value for the electric variable of the wind turbine to be generated.

Abstract: An anchoring assembly part for a wind turbine tower, which part is in a ring- or ring segment shape and prefabricated from a concrete material, and which has at least one projecting reinforcement element for the connection with a lower tower portion made of a concrete material, and at least one bore for receiving an anchor bolt for the detachable connection with an upper tower portion made of steel, an anchor sleeve with an internal thread for screwing in the anchor bolt being arranged in said bore.

Abstract: A method for starting up a wind energy plant after an operation stoppage, wherein the wind energy plant has a gearbox in the drive train and an operation management which can control at least one operational variable significant for the strain of the gearbox B of the wind energy plant to a desired value BSoll, wherein after the operation stoppage, the desired value BSoll is limited by a maximum value BMax, which is preset depending on a measured temperature of a gearbox component and/or of a lubricant for the gearbox.

Abstract: A method for the determination of a control reserve of one or plural wind energy plants, for the operation of which a desired value for at least one electric variable is preset, and for which a control unit is provided which has a power curve, which contains a maximum value of the electric variable depending on values of the wind, the method having the following steps: the control unit determines a maximum value of the electric variable from the actual value of the wind and subtracts a current value of the electric variable from the same, the control unit transmits the determined maximum value and/or the difference as a control reserve to a higher order control unit and/or an external utility.