Abstract: A stator segment for the stator or the rotor of an electrical machine is provided including: two end teeth at two respective circumferential ends, a plurality of N intermediate teeth, N being an integer greater than 1, a plurality of N+1 slots circumferentially distributed between the two end teeth, each pair of circumferentially adjacent intermediate teeth having a slot interposed therebetween, a slot being provided between each end tooth and a respective circumferentially adjacent intermediate tooth, at least one 2-pitch coil, the 2-pitch coils being in the number of N?1 and extending between an i-th slot and a (i+2)-th slot, the slots being progressively counted from one to the other of the two circumferential ends, i being an integer between 1 and N?1.

Abstract: An a arrangement for controlling a DC-link-voltage of a DC-link connected between a generator side converter portion and a utility grid side converter portion of a wind turbine includes: a generalized predictive control module adapted: to receive as control module input values a current value of the DC-link-voltage and a reference value of the DC-link-voltage and to derive a reference value of a DC current based on the control module input values, the reference value of a DC current defining the DC current to be injected into the DC-link, wherein the arrangement is adapted to control the generator side converter portion and/or the utility grid side converter portion based on the reference value of the DC current.

Abstract: A method of determining a blade clearance during operation of a wind turbine is provided, the blade clearance corresponding to a distance between a rotor blade and a tower of the wind turbine. The method includes (a) detecting a rotor blade velocity, (b) emitting a first signal from an observer location, the first signal having a first frequency, (c) receiving a second signal at the observer location, the second signal being reflected from the rotor blade when the first signal impinges on the rotor blade, (d) determining a Doppler shift of the second signal relative to the first signal, and (e) determining the blade clearance based on the first frequency, the Doppler shift, the observer location, and the rotor blade velocity, wherein the step of determining the blade clearance utilizes a mathematical model. A corre-sponding system and a wind turbine comprising such a system are also provided.

Abstract: A wind turbine rotor blade monitoring arrangement comprising includes an electrodynamic exciter mounted on the rotor blade; an excitation unit configured to generate an excitation signal for the electrodynamic exciter; a force sensor configured to measure force imparted to the rotor blade during operation of the electrodynamic exciter, which force sensor is collocated with the electrodynamic exciter; a vibration sensor arranged on the rotor blade at a distance from the electrodynamic exciter; and an evaluation unit configured to infer a health status of the rotor blade on the basis of a vibration sensor output and the measured force. A method of monitoring the health status of a wind turbine rotor blade is also provided.

Abstract: A generator is provided including a stator including stacked lamination sheets and stator windings, and a rotor including magnets, wherein the magnets and the stator windings face each other via an air gap between the stator and the rotor, the air gap extending in a circumferential and axial direction, wherein at least one axial stack of lamination sheets further includes at least one cooling channel for a cooling fluid having at least one inlet opening on an air gap side and at least one outlet opening at a radially opposite non-air gap side of the stack of lamination sheets. The inlet and outlet openings are arranged in a staggered manner in axial direction, wherein each inlet opening is associated with two axially shifted outlet openings such that cooling fluid entering the cooling channel through the inlet opening flows axially in opposite courses and radially to the respective outlet openings.

Abstract: Provided is an exciter device for fatigue testing of a blade of a wind turbine, including a actuator for generating a periodic excitation force and a coupling device for coupling the actuator to a blade to be tested. The exciter device includes a pretensioning device applying a pretension such that the excitation force only acts in a pulling or pushing direction over the whole period.

Abstract: A fully-functional automated bolt tensioning device capable of repeatedly tightening bolts within various locations of an operational wind turbine (e.g., hub, tower, etc.) to a specified tension range is provided. The device includes obstacle detection, alignment, an operational graphical user interface, and nut rotation data acquisition for reduced turbine preventative maintenance cost.

Abstract: A rotor blade with a leading edge and a trailing edge is provided, wherein the rotor blade is designed and configured for being exposed to a fluid flowing substantially from the leading edge to the trailing edge, the rotor blade includes at least two sensors designed for detecting flow characteristics of the fluid and providing respective sensor signals, and the rotor blade further includes at least two actuators for producing an anti-noise signal based on a sensor signal, the sensors are arranged spanwise and the actuators are arranged chordwise at the surface of the rotor blade, and the actuators are 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. Also provided is a method for creating such rotor blade and a related wind turbine.

Abstract: A method of controlling a pitching system of a rotating rotor blade of a wind turbine includes: controlling the pitching system such that unintended pitching due to gravity is reduced.

Abstract: Provided is a method of controlling at least one wind turbine having a wind turbine tower and being connected to a utility grid, the method including: dynamically filtering a utility grid active power in dependence of a damping signal provided for counteracting an oscillation of the wind turbine tower; and controlling the wind turbine in dependence of the filtered utility grid active power.

Abstract: Provided is a method of controlling a wind turbine or a wind park including at least one wind turbine connected to a utility grid for utility grid support, the method including: receiving a control command from a utility grid manager, and selectively controlling the wind turbine according to the control command.

Abstract: Methods, systems, and devices for wind turbine control based on reinforcement learning are disclosed. The method comprises receiving data indicative of a current environmental state of the wind turbine, determining one or more controlling actions of the wind turbine based on the current environmental state of the wind turbine and a reinforcement learning algorithm, and applying the determined one or more controlling actions to the wind turbine.

Abstract: Provide is a rotor blade for a wind turbine, including a hollow blade body with a root and a tip, wherein the blade body is split along a split plane into two body parts, one extending from the root to a first connection section and the other extending from a second connection section to the tip, wherein the first and the second connection sections are adapted to overlap each other in the connected position.

Abstract: A wind turbine includes a marking light system including a marking light for aerial traffic, a data source, including one light sensor, and a marking light controller for controlling the at least one marking light according to data of the data source, in particular sensor data of the light sensor, a wind turbine controller, a power line for the at least one marking light and/or one control line connecting the marking light controller to the wind turbine controller, wherein the wind turbine further includes a switching arrangement including at least one switching unit in the power line or the control line, wherein the switching unit receives a detection signal from an air traffic detection system and to turn the at least one marking light on or off when the detection signal indicates air traffic or no air traffic, respectively, in an area around the wind turbine.

Abstract: A canopy for a direct drive wind turbine is provided. The canopy includes an interface section configured for mechanically coupling the canopy to a generator, wherein the interface section includes at least one outlet configured to receive cooling fluid exhausted by the generator and eject the received cooling fluid. A wind turbine including such a canopy is also provided.

Abstract: A method of repositioning a floating offshore wind turbine located at a current offshore position and having rotor blades rotating in a rotor blade plane includes: measuring a first value of a variability of a load related to a first location at the wind turbine; measuring a second value of a variability of a load related to a second location at the wind turbine; comparing the first value with the second value; and moving the wind turbine along a direction depending on the comparison and in particular further depending on the first location relative to the second location.

Abstract: A method of controlling a wind turbine, wherein a minimum required hydraulic pressure represents a hydraulic pressure of at least one accumulator of the wind turbine which is required to pitch at least one blade of the wind turbine which is associated with the accumulator into a stop position of the wind turbine, and wherein a pitch angle represents a pitch angle of a normal of the at least one blade of the wind turbine relative to an incoming wind direction. The method includes (a) determining a minimum requirement function of the minimum required hydraulic pressure dependent on the pitch angle, (b) detecting a current hydraulic pressure in the at least one accumulator at a current pitch angle of the at least one blade, and (c) controlling the wind turbine such that the current hydraulic pressure is above the minimum required hydraulic pressure at the current pitch angle.

Abstract: Provided is a blade for a wind turbine including at least one blade component, wherein at least one section of the blade component facing the tip of the blade is carbon fiber reinforced, wherein the blade further includes a lightning protection arrangement with a discharging conductor extending along the blade to discharge an electric current caused by a lightning striking into the blade, wherein the lightning protection arrangement includes at least one, electrically conductive, elongated and flat lightning receptor which is electrically connected with the discharging conductor, wherein the lightning receptor is arranged at or near the outer surface of the blade and located between the at least one blade component section and the blade tip and extends at least partially from a trailing edge towards a leading edge of the blade.

Abstract: A turbine blade for a wind turbine is provided, including a blade body with a leading-edge, wherein the blade body is provided with a form changing device covering the leading-edge and extending at least partially along the leading-edge, which form changing device includes a shell fixed to the blade body, which shell is movable by an actuator between a first position close to the leading-edge and a second position distanced to the leading-edge.

Abstract: Provided is a method of controlling at least one converter of at least one wind turbine connectable to a wind park grid of a wind park during black start or island mode of the wind park, the method including: ramping up a converter voltage reference unless a power related condition and/or a wind park grid frequency related condition or a converter current related condition is violated.