A method is provided for installing a jointed rotor blade of a wind turbine. A second section is positioned in a six o'clock position. At least one lifting line is routed through the second section radially inward of an inner surface of the section. A first end of the lifting line is coupled to a first section and a second end of the lifting line is coupled to a power source positioned within at least one of a or a nacelle of the wind turbine. The first section of the jointed rotor blade is lifted toward the second section by driving the lifting line via the power source. The first section and the second section are lined gather at a chordwise joint and coupled at the chordwise joint.

A method is provided for installing a jointed rotor blade of a wind turbine. A second section is positioned in a six o'clock position. At least one lifting line is routed through the second section radially inward of an inner surface of the section. A first end of the lifting line is coupled to a first section and a second end of the lifting line is coupled to a power source positioned within at least one of a or a nacelle of the wind turbine. The first section of the jointed rotor blade is lifted toward the second section by driving the lifting line via the power source. The first section and the second section are lined gather at a chordwise joint and coupled at the chordwise joint.

A lift control device actively controls the lift force on a lifting surface. The device has a protuberance near a trailing edge of its lifting surface, which causes flow to separate from the lifting surface, generating regions of low pressure and high pressure which combine to increase the lift force on the lifting surface. The device further includes an arrangement to keep the flow attached around the protuberance or to modify the position of the protuberance in response to a command from a central controller, so as to provide an active control of the lift between a maximum value and a minimum value.

A rotor rotating device includes at least two rotating units; a movable end of a telescoping cylinder in each rotating unit is provided with a pin; the pin is releasably secured on a rotor. A control method for the rotor rotating device includes: dividing the at least two rotating units into two groups; first removing pins of a first group of rotating units from the rotor, and then re-securing the pins at another positions on the rotor; and after the pins of all the rotating units are re-secured, changing the state of the telescoping cylinders of all the rotating units, and driving the rotor to turn relative to a machine base. In this way, all the rotating units are sequentially unlocked, moved to a next working station, and re-locked on the rotor. A control device, and a rotor rotating system are further provided.

The lengths and/or chords and/or pitches of wind turbine or propeller blades are individually established, so that a first blade can have a length/chord/pitch that is different at a given time to the length/chord/pitch of a second blade to optimize performance and/or to equalize stresses on the system.

The present disclosure relates to a wind power installation having an aerodynamic rotor with at least one rotor blade, wherein the rotor blade has an active flow control device, which is designed to actively influence a flow over the rotor blade, wherein the flow control device comprises an opening in a rotor blade surface, referred to as a rotor blade surface opening, wherein the flow control device is configured to draw off and/or blow out air through the rotor blade surface opening air by way of a controllable air flow, wherein the wind power installation has a controller which is configured to control an amount of the controllable air flow through the rotor blade surface opening according to at least one of the following rules: if a rotational speed threshold value of a rotational speed of the rotor is exceeded, increasing the maximum controllable air flow successively with increasing rotational speed, if a torque threshold value of a torque of the rotor is exceeded, increasing the maximum controllable air flow successively with increasing torque.

A wind turbine including a plurality of foldable rotor blades coupled to a rotatable hub. A mechanical actuation structure is coupled to the plurality of foldable rotor blades to move the plurality of foldable rotor blades to a deployed state, substantially perpendicular to the horizontal rotor axis, to capture kinetic energy from an incoming fluid flow and move the plurality of foldable rotor blades to a non-deployed state, substantially parallel to the horizontal rotor axis. The mechanical actuation structure including a plurality of toothed wheels, each coupled to one of the plurality of foldable rotor blades at a single fixed rotation point, a threaded rod disposed in cooperative engagement with each of the plurality of toothed wheels and a spring disposed proximate the threaded rod and configured to compensate for the static wind load on each of the plurality of foldable rotor blades. A method is also disclosed.

A wind turbine (1) comprising a tower (2), a nacelle (3) and a hub (7) is disclosed. The hub (7) comprises a blade canying structure (4) with one or more wind turbine blades (5) connected thereto. Each of the wind turbine blades (5) is connected to the blade canying structure (4) via a hinge (6) at a hinge position of the wind turbine blade (5), each wind turbine blade (5) thereby being arranged to perform pivot movements relative to the blade carrying structure (4) between a minimum pivot angle and a maximum pivot angle. The wind turbine (1) further comprises a stop mechanism arranged to move the wind turbine blades (5) to a safe pivot angle in the case of an emergency, the stop mechanism comprising a release mechanism (8, 12, 14) and at least one wire (9, 10) interconnecting the release mechanism (8, 12, 14) and each of the wind turbine blades (5). Activation of the release mechanism (8, 12, 14) causes an abrupt change in a pulling force applied to the wind turbine blades (5) by the wire(s) (9, 10), the change in pulling force causes the wind turbine blades (5) to move immediately to the safe pivot angle.

A wind turbine (1) comprising a tower (2), a nacelle (3) and a hub (7) is disclosed. The hub (7) comprises a blade carrying structure (4) with one or more wind turbine blades (5) connected to thereto. Each of the wind turbine blades (5) defines an aerodynamic profile having a thickness which varies along a length of the wind turbine blade (5). Each of the wind turbine blades (5) is connected to the blade carrying structure (4) via a hinge (6) at a hinge position of the wind turbine blade (5), each wind turbine blade (5) thereby being arranged to perform pivot movements relative to the blade carrying structure (4) between a minimum pivot angle and a maximum pivot angle. The hinge position is arranged at a distance from the inner tip end (5a) and at a distance from the outer tip end (5b), and the thickness, or the thickness-to chord ratio, at the hinge position is larger than the thickness, or the thickness-to-chord ratio, at the inner tip end (5a) and larger than the thickness, or the thickness-to-chord ratio, at the outer tip end (5b).

A wind turbine (1) comprising a tower (2), a nacelle (3) and a hub (7) is disclosed. The hub (7) comprises a blade carrying structure (4) with one or more wind turbine blades (5) connected thereto. Each of the wind turbine blades (5) defines an aerodynamic profile having a chord which varies along a length of the wind turbine blade (5). Each of the wind turbine blades (5) is connected to the blade carrying structure (4) via a hinge (6) at a hinge position of the wind turbine blade (5), each wind turbine blade (5) thereby being arranged to perform pivot movements relative to the blade carrying structure (4) between a minimum pivot angle and a maximum pivot angle. The hinge position is arranged at a distance from the inner tip end (5a) and at a distance from the outer tip end (5b), and the chord at the hinge position is larger than or equal to the chord at the inner tip end (5a) and larger than the chord at the outer tip end (5b).