Abstract: An arrangement for determining an operation parameter reference for controlling a generator side converter portion coupled to a generator is provided, including: at least one arithmetic element configured to derive at least one harmonic current error by subtracting a generator output current from at least one harmonic current reference; at least one harmonic current controller configured to determine at least one harmonic reference current deviation based on the harmonic current error; another arithmetic element configured to derive a fundamental current error by subtracting the generator output current from a sum of a fundamental current reference and the at least one harmonic current reference; still another arithmetic element configured to determine a modified fundamental current error as a sum of the fundamental current error and the harmonic reference current deviation; a fundamental current controller adapted to determine the operation parameter reference based on the modified fundamental current error.

Abstract: Provided is a wind turbine including an active yaw system realized to maintain an upwind orientation of the wind turbine aerodynamic rotor during safe operating conditions, which active yaw system includes a number of yaw drive units, and wherein a yaw drive unit includes a negative brake; a principal power supply configured to supply power to the active yaw system during normal operation of the wind turbine; and a dedicated negative brake reserve power supply configured to supply power to the negative brakes in the event of a grid disconnect. A method of operating such a wind turbine is also provided.

Abstract: Provided is an aerodynamic structure for mounting to a surface of a wind turbine rotor blade, which aerodynamic structure includes a plurality of rectangular comb elements and/or a plurality of angular comb elements, wherein a comb element includes comb teeth arranged in a comb plane that subtends an angle to the surface of the rotor blade. The embodiments further describe a wind turbine rotor blade including such an aerodynamic structure.

Abstract: Provided is a stator segment for the stator or the rotor of an electrical machine including a segment body circumferentially extending about a longitudinal axis of the stator segment between two circumferential ends. The segment body includes: a plurality of teeth protruding according to a radial direction orthogonal to the longitudinal axis, each tooth circumferentially extending between two respective side faces, the teeth being circumferentially distributed between two end teeth of the teeth, the teeth including at least one intermediate tooth circumferentially included between the end teeth, a plurality of slots, the plurality of slots including a plurality of intermediate slots circumferentially included between the two end slots, wherein side faces of the two end teeth are inclined with or parallel to each other and the side faces of the at least one intermediate tooth are respectively parallel to each other or inclined with respect to each other.

Abstract: A wind turbine is provided, including a container, a fluid which is arranged inside the container, and a damping body which is arranged inside the container, which is immersed in the fluid, and which is configured to move inside the container, wherein the fluid and the damping body are configured to damp oscillations of the wind turbine. A damper system is provided that on the one hand the fluid damps, e.g. by sloshing, and on the other hand the damping body damps by moving at least partially through the fluid.

Abstract: A protective cover for a leading-edge of a wind turbine rotor blade is provided. The protective cover is pre-formed into a curved shape to accommodate at least a part of a leading-edge section including the leading-edge of the wind turbine rotor blade to be protected. The protective cover includes a pressure side section, a suction side section and a centerline in-between the pressure side section and the suction side section. The centerline runs in longitudinal direction of the protective cover. Thickness of the protective cover in a cross section of the protective cover in transverse direction has a thickness distribution corresponding to a standardized normal distribution.

Abstract: Provided is a weighing device for determining a property of a rotor blade of a wind turbine. The weighing device includes a first seat for receiving the rotor blade at a first radial position of the rotator blade, a second seat for receiving the rotor blade at a second radial position of the rotor blade, a first weight cell for quantifying a first weight which is acting on the first weight cell, a second weight cell for quantifying a second weight which is acting on the second weight cell, and a first counterweight which is configured to alleviate the first weight. Notably, the first counterweight is lifted up from the ground when the rotor blade is received by the first seat of the weighing device. Furthermore, a method of determining the weight, the mass or the torque of a rotor blade of a wind turbine is also provided.

Abstract: A method of replacing a plurality of yaw pads is provided. Yaw pads are arranged between a tower and a nacelle of a wind turbine. The yaw pads are replaced with new yaw pads. The method includes determining the center of gravity of the nacelle. Based on the center of gravity, a set of the plurality of yaw pads to be each substituted by a shim are selected. Each of the substituted shims including a thickness greater than the respective replaced yaw pad. The remaining yaw pads are replaced while the nacelle is supported by the shims.

Abstract: Provided is a method of manufacturing wind turbine rotor blades, wherein each rotor blade includes an inboard section and an outboard section, and wherein an inboard blade section including a root end and a transition region is manufactured using a first casting process; and an outboard blade section including an airfoil region is manufactured using a second casting process, which second casting process is different from the first casting process. The invention further describes a wind turbine rotor blade manufactured using such a method.

Abstract: Provided is a method, computing system, and computer program product for reducing floating wind turbine loads induced by ocean waves by adjusting a blade pitch angle of at least one rotor blade of a floating wind turbine to minimize a moment imbalance at a platform top of the floating wind turbine caused by ocean wave activity.

Abstract: Provided is a method for adjusting a pitch angle of a rotor blade connected to a rotor of a wind turbine, the method includes: pitching the rotor blade towards a target blade pitch angle, the manner of pitching depending on a load on a pitch bearing and/or an azimuthal position of the rotor.

Abstract: Provided is a system for determining an amount of oscillating movement of a wind turbine, the wind turbine including a tower, a non-rotating upper part supported by the tower, a rotor having a rotor axis, and a generator for generating electric power. The system includes (a) a sensor unit adapted to provide a rotor speed signal indicative of a rotational speed of the rotor relative to the non-rotating upper part, (b) a filtering unit adapted to, based on the rotor speed signal provided by the sensor unit, provide a filtered signal including information associated with an oscillating movement of the wind turbine, and (c) a processing unit adapted to determine the amount of oscillating movement based on the filtered signal provided by the filtering unit. Furthermore, a wind turbine and a method are described.

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 including a downwind bearing and an upwind bearing, whereby the downwind bearing and the upwind bearing are arranged between the bearing housing and the drive shaft, wherein the downwind bearing and/or the upwind bearing is a radial fluid bearing including multiple radial bearing pads, whereby each one of the multiple radial bearing pads is attached to one of a multiple radial bearing bodies of the radial fluid bearing and the multiple radial bearing pads are arranged about the drive shaft.

Abstract: Provided is a platform arrangement of a wind turbine, the platform arrangement including a platform and a frame, wherein the platform is destined to be attached to the interior of a tower or a supporting structure of the wind turbine by the frame, and wherein the platform is a standardized component while the frame is specifically adapted to the dimensions of the specific section of the tower or the supporting structure where the platform arrangement is destined to be mounted to. A modularized unit including several such platform arrangements is also provided. Furthermore, an electrical device including such a modularized unit and corresponding electrical equipment a wind turbine generating electricity including such a unit, and a method of mounting electrical equipment for controlling a wind turbine at a wind turbine is provided.

Abstract: A pultruded fibrous composite strip for wind turbine spar caps, a spar cap having such a strip, and a wind turbine blade having such spar cap. The strip has longitudinally extending unidirectional fibers and an elongate body having first and second edge regions separated in the longitudinal direction of the strip by an intermediate region. The intermediate region has first and second mutually opposed longitudinally extending and parallelly disposed planar surfaces. The strip's thickness is measurable perpendicular to the planar surfaces and the width is measurable parallel to the planar surfaces and perpendicular to the longitudinal direction of the strip. In the strip, the first and/or the second edge regions, starting from the intermediate region and extending longitudinally, simultaneously tapers along the width and the thickness of the strip.

Abstract: A measurement system is provided for a wind turbine having a plurality of rotor blades mounted to a spinner at the front of a nacelle and arranged to rotate in a rotor plane. The measurement system includes a measuring device for determining a pressure at a number of pressure measurement points. The pressure measurement points are arranged in front of the rotor plane, an analysis module for generating a control signal on the basis of the pressure measurements, and output means for issuing the control signal to a controller of the wind turbine.

Abstract: A fluid bearing for a wind turbine including a bearing housing, a plurality of bearing pads inside the bearing housing and circumferentially distributed around a longitudinal axis of the fluid bearing, a plurality of supporting structures, each supporting structure having at least a first interface detachably connected to a respective seat provided in the bearing housing and at least a second interface detachably connected to a respective bearing pad of the plurality of bearing pads, the supporting structure including an elastomer allowing tilting of the respective bearing pad parallel to the longitudinal axis, the elastomer being interposed between the respective seat and the respective bearing pad is provided.

Abstract: Provided is a protective cover system including a first protective cover and a second protective cover, both include a polymer and being pre-formed into a curved shape so as to accommodate at least a part of a wind turbine blade to be protected, each of the first and second protective covers has a tip end and a root end, wherein the first protective cover includes a first overlap portion at the root end, and the second protective cover includes a second overlap portion at the tip end, wherein the shape of the first overlap portion is substantially complementary to the shape of the second overlap portion such that when overlapping the first and second overlap portions, the resulting cross section of the overlapped overlap portions substantially corresponds to the cross sections of the first or second protective covers outside the overlap portions.

Abstract: A suction bucket for a seabed foundation for an offshore facility is provided. The suction bucket is arranged for being embedded into a marine sediment. The suction bucket includes a lid and a sidewall. The sidewall is segmented into a first circumferential segment and at least a second circumferential segment. The first circumferential segment is connected with the second circumferential segment. The first circumferential segment and the second circumferential segment are attached to the lid of the suction bucket. Furthermore, the first circumferential segment and the second circumferential segment each contains at least one substantially planar section. Furthermore, a method to manufacture a suction bucket for a seabed foundation for an offshore facility is also provided.

Abstract: Provided is a method of machining a bearing ring of a wind turbine bearing, the method including the steps of identifying a number of local hard zones on a surface of the bearing ring and removing material from the surface such that a bearing ring thickness in local hard zone is less than a bearing ring thickness outside a local hard zone. A machining assembly, a wind turbine bearing and a wind turbine is also provided.