Abstract: A wind turbine has a nacelle wherein a component is equipped with a first temperature sensor for detecting a temperature of the component, a second temperature sensor for detecting an outside temperature inside or outside the nacelle, a heater associated with a component to heat the latter, and a heater controller. The detected temperature of the component and the detected outside temperature are provided as input signals to the heater controller which activates the heater for heating when the detected temperature of the component is below a predetermined switch-on value for the heater. The switch-on value for the heater is, in at least one predetermined temperature interval, dependent on the detected outside temperature. The switch-on value for a first outside temperature is greater than the switch-on value for a second outside temperature in the temperature interval when the second outside temperature is greater than the first outside temperature.

Abstract: A method for making a wind turbine rotor blade half shell includes arranging a fibrous material in a mold, which has an inner side predetermining an aerodynamic surface of the half shell and has a pinching edge defining the profile of a trailing edge of the half shell. A liquid plastics material surrounding the fibrous material is cured. An insert is arranged in relation to the mold in a predetermined position, in which a surface of the insert and a bordering portion of the inner side of the mold conjointly define an acute angle tapering toward the pinching edge, so that a thinly tapering trailing edge of the half shell is formed between the surface of the insert and the bordering portion.

Abstract: A method is provided for operating a wind turbine having an elongated stand apparatus, a generator rotatably mounted on the stand apparatus, and a rotor coupled to the generator via a rotor hub and the wind turbine also having an elongated rotor blade. A position of a radar system is determined with respect to the wind turbine and at least one area is determined for the rotational axis of the rotor as a function of the determined position which is not intended to be permanently assumed for alignment of the rotational axis of the rotor about the longitudinal axis of the stand apparatus. The wind turbine is operated with the at least one determined area not being permanently assumed for the alignment of the rotational axis of the rotor about the longitudinal axis of the stand apparatus.

Abstract: Method for producing a wind turbine rotor blade part with a prefabricated main spar cap, comprising the following steps: providing a mold having a blade-root end and with a blade-tip end, inserting at least one outer root reinforcement layer (28) made of a fibrous material into the mold, arranging the prefabricated main spar cap on the at least one outer root reinforcement layer, arranging, in the mold, at least one inner root reinforcement layer made of a fibrous material on the main spar cap, closing the mold, extracting the air from the mold through at least one extraction channel arranged at a lateral distance from the main spar cap, feeding a liquid plastics material through a first sprue channel which has a plurality of outlet openings below the main spar cap, feeding a liquid plastics material through a second sprue channel which has a plurality of outlet openings above the main spar cap.

Abstract: A method automatically starts a wind turbine after an outage of an electrical supply grid. In the method, at least one measurement value is acquired as to a climatic variable in the wind turbine during the outage of the electrical supply grid. At least one acquired measurement value is recorded and a warning signal is generated prior to a starting of the wind turbine when the at least one recorded measurement value exceeds a predetermined maximum value or drops below a predetermined minimum value.

Abstract: A wind turbine rotor blade includes: a rotor blade root; a rotor blade tip; an electrical heating device; a first lightning receptor disposed in the region of the rotor blade tip; precisely two lightning conductors leading from the lightning receptor to the rotor blade root; a second lightning receptor arranged at a distance to the rotor blade tip and connected to one of the lightning conductors; and, each one of the two lightning conductors being electrically conductively connected to the electrical heating device at a multiplicity of points between the rotor blade root and the rotor blade tip so as to cause equipotential bonding between the two lightning conductors via the electrical heating device in response to a lightning strike to the rotor blade.

Abstract: Rotor blade or rotor blade segment for a wind turbine, having at least one cable for fixing the rotor blade or rotor blade segment to a rotor hub or to a further rotor blade segment, wherein the at least one cable is redirected in a U-shaped manner within the rotor blade or rotor blade segment.

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: The invention is directed to a method for operating a pitch-controlled wind turbine having a rotor blade adjustable about its longitudinal axis and having a generator wherein a set-point for a generator torque (M) is specified in dependence upon a rotational speed (n) of the generator or of the rotor. A transition point (n3, M3) is provided whereat a switchover occurs from a part-load operation to a full-load operation. In the method, a value for air density (?) is determined and a pre-pitch angle (?pre) is set starting at a pre-pitch rotational speed (n4) less than the rotational speed (n3) at the transition point (n3, M3). The value of the pre-pitch angle (?pre) is dependent on the value determined for the air density (?) so that a larger pre-pitch angle is set when the air density is lower than when the air density is higher.

Abstract: The invention relates to a method for monitoring a static and/or dynamic stability of a wind turbine. The wind turbine has a tower, a nacelle, which is supported by the tower, and a rotor, which is mounted in or on the nacelle and has at least one rotor blade which can be adjusted about its longitudinal axis. The method includes the following steps: the wind turbine is excited to oscillate in at least one direction. A frequency (fm) of the excited oscillation is detected. The detected frequency is compared with a predetermined frequency (fref) and an alarm signal is generated if the detected frequency deviates from the predetermined frequency by more than a difference value (?f).

Abstract: Method for operating a pitch-controlled wind turbine, in which a set-point value for the generator torque (M) is prescribed in dependence upon a rotational speed (n) of the generator or of the rotor. A transition point (n3, M3) is provided at which a transition from a partial-load operation to a nominal-load operation occurs. A control of the rotational speed takes place by adjusting the blade pitch angle for a set-point value (M3) from the transition point. The values (n3, M3) of the transition point are determined in dependence upon a current value of the air density. With falling air density, the rotational speed (n3) is increased and/or the set-point value for the generator torque (M3) is reduced.

Abstract: A wind energy plant comprising a gearbox with a gearbox housing, a rotor hub mounted outside of the gearbox and a satellite carrier in the gearbox housing, the satellite carrier having an input side and an output side. At the input side, the satellite carrier is only connected to the rotor hub and mounted in the gearbox housing without a bearing. At the output side, the satellite carrier is mounted in the gearbox housing via a torque bearing arranged in the gearbox housing on the output side of satellite carrier.

Abstract: The invention is directed to a method for cleaning a brake of a wind turbine. The brake has a brake disc and at least one brake unit, wherein the brake disc and the brake unit can be moved relative to one another via a drive. The method includes fastening a cleaning plate to the brake disc; releasing at least one brake unit; moving the brake disc and the brake unit relative to one another so that the cleaning plate is moved past a brake pad of the brake unit while making applied contact engagement to the brake pad; and, dismounting the cleaning plate from the brake disc.

Abstract: A device for locking a rotor blade of a wind turbine which has an adjustment system for the blade pitch angle of the rotor blade, wherein the adjustment system has a drive which features a motor and a gearbox with an input shaft that bears an external toothing, characterized by a locking pin rotatably mounted around its longitudinal axis, which engages with the external toothing in a locking position, and releases the external toothing in an unlocked position, wherein the locking pin has an end portion whose free end stands eccentric to the longitudinal axis of the locking pin.

Abstract: A wind energy plant and method for operating it, the plant having a doubly-fed asynchronous machine, a grid-sided converter and a generator-sided converter both being controlled by a control means. In case of a grid fault the converters are controlled by at least one control module which (i) controls the torque and/or the active power and (ii) controls the reactive current and/or the reactive power.

Abstract: A method for operating a wind turbine when a grid fault with a voltage drop occurs. The turbine has a rotor with a rotor blade having an adjustable blade pitch angle, a generator connected to the rotor for generating power for a power grid and a converter connected to the generator and the power grid. The grid fault is identified and a present value of a turbine variable representing a power is detected and a hold setpoint for the variable representing a power of the turbine is preset. A maximum and/or minimum permissible setpoint for the variable of the turbine is determined. The setpoint is increased or reduced once the hold time has elapsed. The turbine is driven with a setpoint preset which corresponds to the rotational speed. A presetting of the maximum permissible setpoint is ended when the rotational speed-dependent setpoint is lower than the maximum permissible setpoint.

Abstract: Wind turbine rotor blade with a blade tip, a blade root, a leading edge, a trailing edge, a pressure side, a suction side and a cross-section, which changes from the blade tip to the blade root, the longitudinal portion being arranged between the blade root and the middle of the rotor blade, has the following: a convex pressure side portion, which extends from the leading edge up to a pressure-side inflection point, a concave pressure side addition portion, which connects with the pressure-side inflection point with a continuous curvature and extends up to the trailing edge, a convex suction side portion, which extends from the leading edge up to a suction-side kink or inflection point, and a suction side addition portion, which extends from the suction side kink or inflection point up to the trailing edge.

Abstract: Wind turbine rotor blade with a longitudinal axis, a blade tip, a blade root, a leading edge, a trailing edge and a cross-section arranged orthogonally to the longitudinal axis and changing from the blade root to the blade tip, is the cross-section being formed at the blade root and in the middle of the rotor blade by an aerodynamic profile, and an imaginary reference plane arranged with respect to the rotor blade which includes the longitudinal axis of the rotor blade, wherein, in a cross-section, an angle ?3 is defined between the reference plane and a straight line, which connects the longitudinal axis with the trailing edge, and describes the position of the trailing edge, wherein the angle ?3 increases with decreasing distance from the blade root in a first longitudinal portion of the rotor blade and decreases with decreasing distance from the blade root in a second longitudinal portion.

Abstract: The invention relates to a device for heating weather masts on wind turbines. The object of the invention is to eliminate the drawbacks of the prior art and to keep the weather masts of a wind turbine free of ice. The device according to the invention for heating a weather mast on a wind turbine is that the weather mast comprises interconnected pipings. In the pipings, there is arranged a heating system which is formed by one or a plurality of electric heating wires.

Abstract: A method for operating a wind energy plant having a rotor with at least one rotor blade which has an adjustable pitch angle and a generator coupled to the rotor, and a regulation means which, if a there is a deviation of the rotation speed of the generator or rotor from a rotation speed set point, adjusts the pitch angle of the at least one rotor blade such that the rotation speed set point is reached again, wherein an electrical quantity provided by the wind energy plant by means of a generator and fed into a grid is reduced to a predetermined value in a short time by a reduction of a preset value for the generator, wherein prior to the regulation means noticing a deviation of the rotation speed of the rotor or generator from the rotation speed set point effected by the reduction of the preset value, an adjustment of the at least one rotor blade to a new pitch angle is initiated, wherein at the new pitch angle the rotation speed of the rotor or the generator reaches the rotation speed set point at the reduce