A wind turbine having a support structure and a method for operating a wind turbine. The support structure includes a structural component and a reinforcing element. The structural component has fastening holes provided for fastening an operating means. The wind turbine can be operated in at least two states. In an operating state, the reinforcing element is screwed to the fastening portion of the structural component by screw connections which are preloaded in a defined manner using the fastening holes. In a maintenance state, the screw connections are released and the reinforcing element is removed from the structural component of the support structure. A maintenance device can be connected to the fastening portion of the structural component using the fastening holes provided for fastening a maintenance device.

The self-hoisting crane is adapted to be hoisted from a container to a nacelle by operating a cable winch in the container, at least one cable is adapted to extend from the cable winch, around an exit sheave arranged in the container, and exit the container from the exit sheave in an upward direction in order to pass around at least one roller arranged at a crane base on the nacelle and continue in a downward direction to the crane, enter through a central opening in the crane pedestal and continue to the hook block. The exit sheave is located at a longitudinal position of the container deviating not more than 10 percent of the length of the container from the longitudinal position of the centre of gravity of the container.

Provided is a modular tool for installing a platform into a tower section of a wind turbine tower, comprising a first body element, a second body element, wherein each body element has a first base plate, on which the tower section rests in use of the modular tool, and a second base plate, which rests on a foundation in use of the modular tool, wherein the base plates are spaced apart from each other and are arranged parallel to each other, and at least one connecting beam that detachable connects the body elements to each other and that defines a width of a gap between the body elements. Due to the fact that the at least one connecting beam detachable connects the body elements to each other, the modular tool can be easily adapted to different tower diameters by replacing the at least one connecting beam.

A transport system for transporting a tower of a wind turbine including a frame coupled to a tower end of the tower, a wing coupled to the frame, and a lifting unit configured to lift the tower is provided. A tower of a wind turbine including the transport system is also provided. A method of transporting a tower of a wind turbine using the transport system is also provided.

A method of erecting a wind turbine on a wind turbine site, the wind turbine comprising a turbine tower and a nacelle. The method comprises the following steps: providing a plurality of tower sections being arrangeable upon each other in a vertical orientation in a tower structure to form the turbine tower; providing at least one damper unit configured to dampen oscillations of the turbine tower; attaching a damper unit to one of the plurality of the tower sections on an outside thereof, and subsequently arranging the tower section in the tower structure, and arranging the nacelle on top of the tower structure while the damper unit is attached to a tower section in the tower structure.

A nacelle for a wind turbine and a method for erecting a wind turbine are disclosed. The nacelle comprises a main unit arranged to be connected to a wind turbine tower, via a yawing arrangement, and at least one side unit mounted along a side of the main unit in such a manner that direct access is allowed between the main unit and the side unit(s), each side unit accommodating at least one wind turbine component, and at least one side unit being capable of carrying the wind turbine component(s) accommodated therein. The main unit and at least one of the side unit(s) are distributed side by side along a substantially horizontal direction which is substantially transverse to a rotational axis of a rotor of the wind turbine. A sufficient interior space of the nacelle is obtained while allowing the nacelle to be transported due to the modular construction. The weight of the wind turbine components is arranged close to the tower due to the transversal arrangement of the side unit(s) relative to the main unit.

A wind turbine having a support structure and a method for operating a wind turbine. The support structure includes a structural component and a reinforcing element. The structural component has fastening holes provided for fastening an operating means. The wind turbine can be operated in at least two states. In an operating state, the reinforcing element is screwed to the fastening portion of the structural component by screw connections which are preloaded in a defined manner using the fastening holes. In a maintenance state, the screw connections are released and the reinforcing element is removed from the structural component of the support structure. A maintenance device can be connected to the fastening portion of the structural component using the fastening holes provided for fastening a maintenance device.

A wind turbine (1) comprising a tower (2) and one or more nacelles (3) mounted on the tower (2) is disclosed, at least one of the nacelle(s) (3) housing one or more drive train components (9,10,11) and a transportation system for moving drive train components (9,10,11) of the wind turbine (1). The transportation system comprises one or more sliding rails (15) configured to carry a drive train component (9, 10,11) during movement, and one or more sledges (19). Each sledge (19) is movably connected to a sliding rail (15), and configured to be attached to a drive train component (9,10,11), thereby allowing the drive train component (9,10,11) to move along the sliding rail(s) (15). Each sliding rail (15) comprises two or more rail modules (6,13,14) being detachably connected to each other along a direction of movement defined by the sliding rail (15).

A method and a lifting arrangement for mounting a blade on a wind turbine rotor carried by a wind turbine structure. The method comprises providing a control line guide at the wind turbine structure, the control line guide forming a control line point configured to restrain the control line attaching the control line to the control line point; lifting the blade with an external blade lifting crane while a root end of the blade is guided towards the rotor by use of said control line restrained at said control line point, and connecting said blade to said rotor.

An assembly, installation package and method for installing a wind turbine tower. The assembly (139) comprises an installation unit (114) having unit guides (140), each configured to engage a corresponding engagement guide (130) adjacent to an upper inner edge of the tower section (110) to guide the assembly while it is lowered into the tower section. The assembly also includes a yoke (136) releasably connected to the installation unit and comprising yoke guides (146), each configured to engage a corresponding engagement guide (130) adjacent to the upper inner edge of the tower section to guide the assembly while it is lowered into the tower section (110). The assembly (139) is configured such that at least one of the unit guides (140) and/or the yoke guides (146) is or are substantially continuously engaged with the engagement guides (130) from when the assembly (139) enters the tower section (110) until the assembly reaches its installation position within the tower section.