Abstract: A wind turbine nacelle including an outer cover defining an interior volume within which is housed a powertrain assembly comprising: a gearbox including an input shaft and an output shaft which are aligned on a common rotational axis, an electrical power generator connected to the output shaft of the gearbox. The power generator includes a generator cabinet that encloses, in an internal chamber, a stator at a radially outward position and a rotor in a radially inward position, the rotor being rotatable about the common rotational axis.

Abstract: The invention relates to wind turbines, particularly to controlling reactive power exchange between a power grid and a wind power plant. The wind power plant has a plurality of wind turbine generators each having a corresponding power converter with a converter controller. Further, the wind power plant has a power plant transformer with an on load tap changer coupled between the wind power plant and the power grid. The power plant controller is regulating the on load tap changer and is generating reactive component setpoints for the wind turbine generators, when determining a need for production of short-term reactive power due to a sudden change in reactive power measured at the point of common coupling.

Abstract: According to the present invention there is provided a mould for making a wind turbine blade shear web. The shear web comprises a longitudinally-extending web panel and a mounting flange extending along a longitudinal edge of the web panel and transverse to the web panel. The mounting flange comprises a first portion extending on a first side of the web panel and a second portion extending on a second side of the web panel. The mould comprises a longitudinally-extending main surface shaped to form the web panel, the main surface having a longitudinal edge. The mould further comprises a side surface arranged transverse to the main surface and extending downwards from the longitudinal edge of the main surface.

Abstract: A method for installing at least one damper unit in a tower section of a wind turbine tower is disclosed. The tower section is arranged with its centre axis in a substantially horizontal orientation, and a guiderail is introduced into the tower section. A trolley is mounted on a part of the guiderail extending out of the tower section, the damper unit is mounted on the trolley, and the trolley with the damper unit is moved along the guiderail to a position inside the tower section. The damper unit is positioned in an installation position being vertically offset from the centre axis of the tower section, wherein the positioning comprises elevating the damper unit, and the damper unit is attached to the tower section at the installation position.

Abstract: A wind turbine blade (108) providing enhanced shear distortion resistance comprises a root end (118) and a tip end (116), a leading edge (112) and a trailing edge (114), and a suction side shell (122) and a pressure side shell (124) between which there is provided first and second shear webs (150, 152, 166, 168, 170, 172). The first and second shear webs (150, 152, 166, 168, 170, 172) are arranged in V-configuration in a chordwise cross section of the blade, whereby at least one of the first and second shear webs (150, 152, 166, 168, 170, 172) is non-orthogonal to the chord line (115), and the first and second shear webs are non-parallel. A method of manufacturing the wind turbine blade includes the step of providing respective upper and lower mould halves (200, 202) for the blade interconnecting the first and second shear webs (150, 152, 166, 168, 170, 172) by an elastic structure (190) biasing the shear webs towards one another before closing the mould.

Abstract: A power transmission system for a wind turbine includes a main shaft configured to be driven by the rotor about a main axis, a support structure including at least one bearing supporting the main shaft for rotation about the main axis, and a gearbox having a gearbox housing rigidly coupled to the support structure and a gearbox input member coupled to the main shaft. The gearbox housing supports the gearbox input member for rotation about the main axis, and the gearbox input member is coupled to the main shaft with a translational degree of freedom along the main axis and rotational degrees of freedom about axes perpendicular to the main axis. The main shaft is coupled to the gearbox input member by a flexible coupling positioned at least partially within the main shaft. The flexible coupling may be positioned entirely within the main shaft.

Abstract: A method of operating a power generating system for a wind turbine connected to an electrical grid, the power generating system comprising a power generator, a converter, a transformer and a tap changer, the method comprising; when operating the power generating system in a grid-forming configuration, monitoring a signal for detecting a voltage of the electrical grid which requires an increase in output voltage from the power generating system in order to maintain the grid voltage within a predetermined voltage range; and operating the tap changer to tap-up the transformer to provide at least part of the voltage increase required to maintain the grid voltage within the predetermined voltage range.

Abstract: The invention provides a method of reducing noise emissions of a wind turbine. The method includes receiving data indicative of wind conditions in the vicinity of the wind turbine, and determining an operational set point signal in accordance with a desired operation of the wind turbine, the operational set point signal being determined based on the received data. The method includes applying a perturbation signal to the operational set point signal to obtain a modified operational set point signal, and controlling operation of the wind turbine using the modified operational set point signal to reduce noise emissions of the wind turbine. The perturbation signal is applied such that the modified operational set point signal has greater temporal variation than the operational set point signal.

Abstract: A bushing (42, 92) for connecting a wind turbine blade (20) to a rotor hub (18) of a wind turbine (10) including a main body (44, 94) defining a connecting end of the bushing (42, 92) for receiving a fastener (130) for securing the blade (20) to the rotor hub (18), a tubular extension (46, 96) extending distally from the main body (44, 94) and defining a tip end of the bushing (42, 92) and a central bore (52, 102) extending from the connecting end to the tip end of the bushing (42, 92) and defining a central axis (94, 104) of the bushing (42, 92). The tubular extension (46, 96) includes one or more tapered or cylindrical sections (74,124) and a tip section (76, 126) distal of the one or more tapered or cylindrical sections (74, 124) and adjacent the tip end. The tip section (76, 126) includes an outer surface and an inner surface that are substantially parallel to each other and substantially parallel to the central axis (94, 104) of the bushing (42, 92).

Abstract: A main nacelle unit (22) for forming a nacelle (14) of a wind turbine (10) includes a main housing (28) having an outer wall (30a. 30b) and containing a base frame (52) configured to be attached to a tower (12) of the wind turbine (10). The main nacelle unit (22) also includes at least one support frame (56) configured to support a wind turbine component (54) external to the main housing (28). A portion of the support frame (56) is attached to the base frame (52) and movable between a stored position and a deployed position. In the stored position, the portion of the support frame (56) is configured to be positioned within the confines of the main housing (28), and in the deployed position, the portion of the support frame (56) is configured to extend through the main housing outer wall (30a. 30b) to support the wind turbine component (54) external to the main housing (28). A method of assembling a wind turbine using the support assembly is also disclosed.

Abstract: A method of handling an auxiliary nacelle unit (24, 26) of a wind turbine (10) includes assembling a temporary hoist (52) on a main nacelle unit (22) by pivotally connecting a boom (64) to the main nacelle unit (22), pivotally connecting a mast (66) to the main nacelle unit (22), connecting the actuator (68) between the mast (66) and the boom (64), and routing a hoist cable (56) from a winch (54) to a hoist cable locator (60). The method further includes connecting the hoist cable (56) to an auxiliary nacelle unit (24, 26), activating the winch (54) to move the auxiliary nacelle unit (24, 26) from a first position to a second position, and activating the actuator (68) to move the boom (64) between the retracted position and the extend position. A lifting arrangement (50) for handling an auxiliary nacelle unit (24, 26) of a wind turbine (10) is also disclosed.

Abstract: According to the present invention there is provided a modular wind turbine blade comprising first and second blade modules connectable together to form at least part of the wind turbine blade, each blade module comprising an outer shell defining a pressure side and a suction side of the wind turbine blade. The first blade module comprises a first spar cap, and the second blade module comprising a second spar cap. The first spar cap has a tapered end portion in which the thickness of the first spar cap decreases towards the end of the first spar cap. The modular wind turbine blade further comprises an elongate connecting element for connecting the first and second blade modules together. The connecting element has a first tapered end portion in which the thickness of the connecting element decreases towards a first end of the connecting element. The first tapered end portion is configured for bonding to the tapered end portion of the first spar cap.

Abstract: A method of correcting a pitch angle deviation of a blade of a wind turbine is provided. First blade load measurements measured when the wind turbine was operating in a first operational mode are provided, and used to determine calibration parameters. Second blade load measurements measured when the wind turbine was operating in a second operational mode are provided, and the calibration parameters applied to determine calibrated blade load measurements. A pitch angle deviation of at least one blade of the turbine is estimated based on an identified difference between the calibrated blade load measurements, and a pitch angle is adjusted to correct for the pitch angle deviation.

Abstract: A transport frame (100, 102) for a nacelle (14) includes a pair of lower nacelle mounts (128, 130) and a pair of upper nacelle mounts (204, 206). Each of the lower nacelle mounts (128, 130) includes a plurality attachment points for attaching to the nacelle (14) at a plurality of different widths. Each of the upper nacelle mounts (204, 206) includes a plurality of attachment points for attaching to the nacelle (14) at a plurality of different widths. The pair of lower nacelle mounts (128, 130) and the pair of upper nacelle mounts (204, 206) are adjustably positioned to allow the transport frame (100, 102) to attach to the nacelle (14) at a plurality of different heights. The ability of the transport frame (100, 102) to attach to the nacelle (14) at a plurality of different widths and heights allows the transport frame (100, 102) to be used on nacelles (14) having different sizes. Methods of using the transport frames (100, 102) are also disclosed.

Abstract: A method of trimming a production flange (52) from a wind turbine blade (10) during manufacture of the wind turbine blade (10). The method comprises mounting a self-propelled flange trimming apparatus (60) on the production flange (52) and using a drive system (64, 66) of the apparatus (60) to propel the apparatus (60) along the production flange (52). A directional control system controls the direction of the apparatus (60) and a cutting tool (81) cuts through the production flange (52) as the apparatus (60) travels along the production flange (52). Also, a self-propelled production flange trimming apparatus (60) comprising a carriage (61) with a drive member (64, 66), a directional control system, and a cutting tool (81) attached to the carriage (61). A system comprising a wind turbine blade moulding (50) and a trimming apparatus (60) mounted on the production flange (52) of the moulding (50).

Abstract: A method of controlling a wind power plant including an energy storage device, the wind power plant being connected to a power grid and comprising one or more wind turbine generators that produce electrical power for delivery to the power grid, the method comprising: processing grid data related to the power grid to determine a probability forecast for a future state of the grid; and controlling charging and discharging of the energy storage device in accordance with the probability forecast.

Abstract: A wind turbine blade having a blade shell with a lightning protection system; the lightning protection system comprising: a first electrically conductive pin, and a second electrically conductive pin adjacent to the first electrically conductive pin; a metal layer at an outer surface of the blade shell, the metal layer split into a first portion and a second portion with a discontinuity between the first and second portions; wherein the first electrically conductive pin extends through the first portion of the metal layer and not through the second portion of the metal layer; and wherein the second electrically conductive pin extends through the second portion of the metal layer and not through the first portion of the metal layer.

Abstract: Embodiments herein describe a discharge filter, located in a root of a wind turbine blade, which includes one or more cables wound into large scale inductors using an internal or external surface of the root as a mandrel. These cables provide power inputs to an electrical panel for one or more a powered systems that are located in a body of the wind turbine blade. The electrical panel is connected to a lightning protection system that selectively provides a path to ground, and the inductors form a high-impedance barrier that shunts power away from the cables and onto the lightning protection system in the event of a lightning strike or other electrical discharge traveling from the powered systems to the electrical panel.

Abstract: A method for controlling charging of at least one electrical storage device is disclosed. Information regarding a power grid and the at least one electrical storage device is used by an aggregator to derive a weighted distribution of virtual inertia response and fast frequency response to be provided to the power grid by the electrical storage devices. A total power available for charging the at least one electrical storage device is derived in accordance with the weighted distribution by a charging controller. An active power setpoint is derived for each of the at least one electrical storage device on the basis of at least (i) the total available power and (ii) the information regarding the at least one electrical storage device. Finally, a charging state of each of the at least one electrical storage device is controlled based on the derived active power setpoint.