A nacelle assembly for a wind turbine is connected to a wind turbine tower through a yaw system and includes a front region coupled to a rotor having a rotor hub and at least one rotor blade. The nacelle assembly includes a nacelle having a cover structure to house wind turbine components and an add-on wind flow deflector system that is coupled to an outside of the cover structure. The wind flow deflector system guides wind flowing to the nacelle for reducing a drag of the nacelle when a wind direction is misaligned with respect to the longitudinal wind direction in a yaw system failure event.

A nacelle assembly for a wind turbine is connected to a wind turbine tower through a yaw system and includes a front region coupled to a rotor having a rotor hub and at least one rotor blade. The nacelle assembly includes a nacelle having a cover structure to house wind turbine components and an add-on wind flow deflector system that is coupled to an outside of the cover structure. The wind flow deflector system guides wind flowing to the nacelle for reducing a drag of the nacelle when a wind direction is misaligned with respect to the longitudinal wind direction in a yaw system failure event.

Methods, systems, and devices for dynamic wind turbine rotational speed control are described. The method may include attaching a vane shaft to a support arm of the wind turbine, the vane shaft partially inserted into a cylindrical aperture of an airfoil of the wind turbine, rotating an airfoil around a vertical axis of the wind turbine, and controlling, via a torsion spring of the wind turbine, when a rear stop of the speed control assembly exerts a force on the airfoil to reduce the rotational speed of the wind turbine, where the torsion spring is configured to facilitate the rear stop to exert the force on the airfoil when a rotational speed of the wind turbine around the vertical axis exceeds a set rotational speed, where a portion of the vane shaft is inserted into a helical portion of the torsion spring.

Methods, systems, and devices for dynamic wind turbine rotational speed control are described. The method may include attaching a vane shaft to a support arm of the wind turbine, the vane shaft partially inserted into a cylindrical aperture of an airfoil of the wind turbine, rotating an airfoil around a vertical axis of the wind turbine, and controlling, via a torsion spring of the wind turbine, when a rear stop of the speed control assembly exerts a force on the airfoil to reduce the rotational speed of the wind turbine, where the torsion spring is configured to facilitate the rear stop to exert the force on the airfoil when a rotational speed of the wind turbine around the vertical axis exceeds a set rotational speed, where a portion of the vane shaft is inserted into a helical portion of the torsion spring.

A wind turbine support assembly includes a bedframe and a support structure, wherein the bedframe is adapted for attaching the support assembly to a wind turbine tower, wherein the support structure includes at least one beam, wherein a web section of the beam is attached to an attachment area of the bedframe by a bolted connection including at least one bolt arranged perpendicular to the web section, wherein on the side of the web section opposite to the attachment area at least one retaining means is arranged for holding a bolt or a nut, which is attached to the bolt, in a non-rotatable manner.

The invention provides a method for stabilising a wind turbine blade (106), the method comprising, attaching (S2) an air blowing arrangement (201) to the blade, detecting (S4) an oscillation of the blade, and operating (S5) the attached air blowing arrangement to provide a thrust to counteract the oscillation.

The present invention discloses a helicopter hoisting platform for a wind turbine nacelle cover, the helicopter hoisting platform comprising a composite layer and a plurality of metal plates arranged on the outer surface of the composite layer, wherein the plurality of metal plates forms a conductive network electrically connected to a ground connection.

The present invention discloses a helicopter hoisting platform for a wind turbine nacelle cover, the helicopter hoisting platform comprising a composite layer and a plurality of metal plates arranged on the outer surface of the composite layer, wherein the plurality of metal plates forms a conductive network electrically connected to a ground connection.

A tool chain (10) is provided for performing a method of removing internal components such as a bearing cassette (64) from the interior of a generator (12) and/or a gearbox (14) of a wind turbine. The tool chain (10) includes a tube (30) that extends through the interior of the generator (12), at least one clamp element (36) that concentrically fixes the tool chain (10) in position on at least one output shaft (60, 62) of the gearbox (14), and a sliding tool (50) that moves along the tube (30) into and out of the generator to couple with and pull out internal components to be repaired or replaced. For example, the tool chain (10) can remove the bearing cassette (64) located adjacent the junction of the gearbox (14) and the generator (12) without necessitating disassembly of the gearbox (14) from the generator (12).

The present disclosure relates to a portable device for hoisting/lowering/storing a rope from a tall structure, such as a wind turbine. The device is formed of an assembly of a rope storage container and a rope driver reversibly connected thereto. The rope storage container defines a rope storage volume bound between a bottom surface and an outer side wall. The rope driver is reversibly connectable to the container and comprises a rope passage having a dimension matching a diameter of the rope. The passage is formed between a pair of adjacent rollers or between a drive coil and a clamp. The rope is driven (hoisted and stored or provided and lowered) by an electric motor arranged to drive at least one of the rollers or the drive coil.