Abstract: A wind turbine blade assembly, includes a wind turbine blade and a lightning protection system including an internal down conductor inside the wind turbine blade and multiple air termination devices having a receptor, which is electrically conductively coupled to the down conductor, wherein the length of the wind turbine blade assembly is divided into a first part having the internal down conductor and spanning from the blade root to at least one first air termination device and a second part spanning from the first air termination device to the assembly tip, wherein the lightning protection system further includes a second air termination device in the second part, and an external, electrically conductive strip extending between a pair of a first and a second air termination devices in the second part and being electrically conductively coupled to their receptors.

Abstract: An offshore wind turbine erected in a body of water includes a generator, a foundation, a nacelle, a tower having a first end mounted to the foundation and a second end supporting the nacelle, an electrolytic unit arranged above a water level and electrically powered by the generator to produce hydrogen from an input fluid, in particular water, and a fluid supply assembly for supplying the input fluid from a fluid inlet arranged below the water level to the electrolytic unit by means of a fluid connection, wherein the fluid supply assembly includes a cleaning unit configured to clean a build-up formed along an area extending through the inner part of at least a part of the fluid connection or formed at the fluid inlet.

Abstract: A rotor blade with a leading edge and a trailing edge is provided, wherein the rotor blade is for being exposed to a fluid flowing substantially from the leading edge to the trailing edge, the rotor blade includes at least three sensors designed for detecting flow characteristics of the fluid and providing respective sensor signals, wherein the sensors are arranged with a non-uniform spacing, and the rotor blade further includes at least one actuator for producing an anti-noise signal based on a sensor signal, the sensors and the actuator are arranged at the surface of the rotor blade, and the actuator is arranged and prepared such that flow-induced edge noise of the rotor blade, which is generated by the fluid, is at least partly cancelled out by the anti-noise signal. A method for creating such rotor blade and a related wind turbine is also provided.

Abstract: Provided is a bearing arrangement for a wind turbine including a bearing housing and a drive shaft, whereby the drive shaft is arranged within the bearing housing in an axial direction along a longitudinal axis of the bearing housing, the bearing arrangement further comprising a downwind bearing and an upwind bearing as radial fluid bearings, whereby the downwind bearing and the upwind bearing are arranged between the bearing housing and the drive shaft, whereby the bearing housing is formed from at least two separate bearing housing pieces, whereby the at least two separate bearing housing pieces are joined with each other and/or the drive shaft is formed from at least two separate drive shaft pieces, whereby the at least two separate drive shaft pieces are joined with each other.

Abstract: A method for compensating an imbalance of a wind rotor of a wind turbine includes applying at least one test-offset to a parameter characterizing a state of the wind rotor, wherein the imbalance depends on the parameter; measuring for the at least one test-offset an acceleration of the wind turbine, wherein the acceleration depends on the imbalance; and determining a compensation-offset based on the measured acceleration, wherein the imbalance is at least partially compensated, when the compensation-offset is applied to the parameter. Furthermore, a corresponding wind turbine includes a control unit configured to carry out the above method.

Abstract: Provided is a wind turbine and to a method and a device for controlling aerodynamic properties of a blade of the wind turbine, the blade including a predetermined number of add-on members which are actuated by a corresponding trim actuator to alter the aerodynamic properties of the blade, wherein each trim actuator is configured to hold the add-on member in a predetermined first position and a predetermined second position. The control device is configured to determine a first number of add-on members which are to be held at the predetermined first position, and to determine a second number of add-on members which are to be held at the predetermined second position.

Abstract: A mold for manufacturing a wind turbine blade, including: a lower mold component, and an upper mold component, wherein the lower mold component and the upper mold component form a mold cavity in the shape of a wind turbine blade, and the upper mold component includes at least two upper mold parts is provided. The required floor-to-ceiling height of a production hall is decreased and the required lifting capacity of a crane is lowered.

Abstract: A method and system of controlling operation of wind turbines is provided, the method including (a) receiving a parameter value which is based on at least one sensor signal, (b) determining a difference between the received parameter value and a predetermined value, (c) comparing the difference with a threshold value, and (d) if the difference is below the threshold value, operating the wind turbines in a first mode of operation, (e) if the difference is not below the threshold value, incrementing an alert counter, comparing the alert counter with an alert threshold value, operating the wind turbines in a second mode of operation if the alert counter is smaller than the alert threshold value or if the alert counter exceeds the second threshold value and the difference is decreasing, triggering an alarm if the alert counter exceeds the alert threshold value and the difference is not decreasing.

Abstract: A method for determining improved control parameters of a number of wind turbines of a wind park is provided. The method considers the impact of individual turbine manufacturing tolerances on the turbine performance, thereby avoiding under-utilization of those wind turbines. The method includes the steps of: receiving, by an interface, one or more actual manufacturing tolerances of characteristic values for each of the number of wind turbines; determining, by a processing unit, for each of the number of wind turbines a power versus wind speed map which is calculated from a given turbine model with the one or more actual manufacturing tolerances of the respective wind turbines as input parameters; and deriving, by the processing unit, the control parameters for each of the number of wind turbines from their associated power versus wind speed map.

Abstract: Provided is an arrangement for discharging current due to a lightning stroke at a tip add-on of a rotor blade of a wind turbine, the arrangement including a conductor adapted to conduct the current due to the lightning stroke; an insulation arranged around the conductor, the insulation with the conductor being arrangeable within the tip add-on.

Abstract: A device and a method of controlling blade instabilities of a wind turbine is provided. The method including the following steps: defining at least one preliminary overspeed threshold value; defining a fluttering rotor speed at and above which a predetermined fluttering of at least one of the blades occurs, the fluttering rotor speed is defined as a function of the pitch angle and/or as a function of the wind speed; setting a final overspeed threshold value to be equal to or smaller than a minimum rotor speed of the at least one preliminary overspeed threshold value and the fluttering rotor speed at the actual pitch angle and/or at the actual wind speed; and controlling the rotor speed to not exceed the final overspeed threshold value.

Abstract: Provided is an electric generator including a stator including: a stator yoke a plurality of teeth, a plurality of slots extending radially from the stator yoke to respective radial slot ends, the plurality of slots being circumferentially interposed between the teeth of the stator, each slot including a bottom portion adjacent to the stator yoke and a top portion adjacent to the respective radial slot end. The stator further includes a plurality of coils housed in the plurality of slots, each slot housing at least one coil in the bottom portion and at least another coil in the top portion, each coil housed in the bottom portion of a first slot of the plurality of slots being connected to another respective coil housed in the top portion of a second slot of the plurality of slots.

Abstract: Provided is controller for a wind turbine including a power controller unit for controlling a power output of an electric generator included in the wind turbine. The power controller unit operates the electric generator according to a speed reference value and a power reference value, the speed reference value and a power reference value being chosen along a linear operating trajectory in a power vs speed graph, the linear operating trajectory including a point corresponding to the nominal power and the nominal generator speed. The power controller unit includes a slider command for selecting the angular position of the linear operating trajectory in the power vs speed graph.

Abstract: Provided is a filter device configured for providing air for a generator of a wind turbine. The filter device includes a housing including a filter, at least one attaching element configured for attaching the housing to a drive end side of the generator, such that the air is guidable through the filter into the generator. Further, a wind turbine is provided which includes a filter device for providing air for a generator of the wind turbine. Furthermore, a method for arranging a filter device configured for providing air for a generator of a wind turbine is also provided.

Abstract: A method of adapting noise emission configurations of plural wind turbines, the method including: determining total wind turbine related noise levels at plural locations; determining, among the plural locations, a critical location having a most critical, in particular highest, total wind turbine related noise level; if the most critical total wind turbine related noise level is above a noise threshold: reducing the noise emission configuration of a wind turbine having the highest noise to power impact ratio, is provided.

Abstract: A removable, functional module for a wind turbine is provided. The functional module includes a fastening element configured to detachably fasten the functional module to the wind turbine in a predetermined position, wherein the functional module is removable from the predetermined position, when the fastening element is unfastened. The functional module further includes a cover configured to form part of a housing of the wind turbine, when the functional module is in the predetermined position. The functional module is configured to carry out a function contributing to the operation of the wind turbine, when the functional module is in the predetermined position. Furthermore, a corresponding method for coupling a functional module to a wind turbine is also provided.

Abstract: Provide is a nacelle for a wind turbine includes: an external surface exposed to a magnetic flux induced by lightning, an electrical generator rotating about a rotational axis, the electrical generator including a rotor, a stator, an airgap separating the rotor and the stator, and a plurality of electrical conductors wound in the rotor or the stator adjacently to the airgap, a lightning protection arrangement including at least one waveguide between the rotor and the stator and interposed between the external surface and the airgap for providing a shielding to the electrical conductors from the magnetic flux induced by lightning.

Abstract: A method for installing an offshore installation is provided, the method including: a) providing a pipe for connecting the offshore installation with another offshore installation or an onshore installation; b) arranging an electrical cable inside the pipe; c) determining a level at or above the seabed, wherein the pipe includes a first portion arranged below the determined level and a second portion arranged above the determined level, and wherein the electrical cable is arranged inside the pipe so as to form a gap with an inner wall of the pipe along the first and second portion; d) determining an amount of cooling liquid such that, when the cooling liquid has a first temperature, the cooling liquid fills the gap along the first portion of the pipe, wherein the second portion of the pipe is free of the cooling liquid, and when the cooling liquid cools the electrical cable.

Abstract: A method for treatment using a cutting arrangement includes providing a rotor blade of a wind turbine and attaching an alignment tool to the rotor blade. The alignment tool includes at least one fixation means for fixing the alignment tool to proximate a trailing edge of the rotor blade that is a structure attachable to a first surface and a second opposing surface of the rotor blade. The alignment tool further includes at least one guiding structure operably connected to the fixation means that is configured to embrace the leading edge of the rotor blade and includes at least one groove or at least one edge that provides guidance for a cutting edge of a cutting apparatus. The method includes treating the rotor blade using the cutting apparatus, in which the cutting edge of the cutting apparatus is guided by the at least one guiding structure of the alignment tool.