Abstract: The present invention relates to a method of controlling an idling wind turbine in which wind condition data and wind turbine position data are collected by a sensor system, a control system computes an optimal pitch angle for a rotor blade of the wind turbine, and a pitching system continuously turns the rotor blades in the same direction in multiples of 360 degrees. The present invention further relates to a wind turbine with a sensor system including a wind sensor that measures wind condition data in the vicinity of the wind turbine, and a control system including a computer that executes a control algorithm and processes sensor input from the sensor system to compute an optimal pitch angle value for a rotor blade on the hub. This allows pitching the rotor blade into angle in which the mechanical loads of that rotor blade are reduced to a minimum when idling.

Abstract: A wind turbine rotor blade for a wind turbine having a length extending from a first end, a leading edge and a trailing edge, where a pressure side and a suction side extend between the leading edge and the trailing edge and thus define an airfoil shaped cross section. At least along a part of the length of the wind turbine rotor blade, the trailing edge comprises a trailing edge part having a first and a second installation flange, each of which has a width. The installation flanges are arranged in connection with a trailing edge extender, the first and second installation flanges both having an inner surface for installation on the pressure side and the suction side of the wind turbine blade. Also, method for fitting a wind turbine rotor blade with a trailing edge part is provided.

Abstract: Provided is a blade for a rotor of a wind turbine having a substantially horizontal rotor shaft, said rotor comprising a hub, from which the blade extends substantially radially when mounted, said blade having a chord plane extending between a leading edge and a trailing edge of said blade, a root area closest to the hub, an airfoil area furthest away from the hub, a transition area between the root area and the airfoil area, a first airfoil extending substantially along the entire airfoil area, and a second airfoil separately mounted to the blade, said second airfoil arranged at a mutual distance transverse to the chord plane and extending along the root area of the blades.

Abstract: The present invention relates to a table for a wind turbine equipped with attachment devices 103 for attaching servicing equipment, 401, 402, said attachment means being attached at and accessible from the blade exterior. They may be located in cavities and be covered when not in use. Hereby it is accomplished that the blade can be serviced and repaired while positioned horizontally without the attachment devices as such otherwise influencing the aerodynamic properties of the blade. One possibility is that during manufacturing such a cavity is closed but the cavity can later be broken open. Additionally, the invention relates to a wind turbine featuring such blade and a method of servicing a blade when mounted on a wind turbine, wherein servicing equipment is attached to at least one attachment device in the blade. It is furthermore mentioned, that the attachment devices might be used when mounting a blade.

Abstract: Provided is a blade for a rotor of a wind turbine having a substantially horizontal rotor shaft, said rotor comprising a hub, from which the blade extends substantially radially when mounted, said blade having a chord plane extending between a leading edge and a trailing edge of said blade, a root area closest to the hub, an airfoil area furthest away from the hub, a transition area between the root area and the airfoil area, a first airfoil extending substantially along the entire airfoil area, and a second airfoil separately mounted to the blade, said second airfoil arranged at a mutual distance transverse to the chord plane and extending along the root area of the blades.

Abstract: The present invention relates to a wind turbine blade for a rotor of a wind turbine having a substantially horizontal rotor shaft and a hub connected to the rotor shaft, the blade extending in a substantially radial direction from the hub, when mounted to the hub, wherein the blade comprises: a profiled contour comprising a pressure side and a suction side and a leading edge and a trailing edge connecting the pressure side and the suction side, a lift regulating device, and an operation device comprising an electromagnet configured to operate the lift regulating device between a first state and a second state. The lift regulating device comprises a magnetisable material.

Abstract: A method of controlling the yawing of two-bladed wind turbine is described. The yaw speed of the turbine is increased when the wind turbine rotor blades are in a substantially vertical position, and the yaw speed may be reduced when the blades are substantially horizontal. By modulating the yaw rate based on the rotational angle of the blades, the effect of the yaw moments on the wind turbine structure is reduced, and the wind turbine may be designed to take into account such reduced forces.

Abstract: A blade for a partial pitch wind turbine is described, wherein the blade has a truncated aerodynamic profile provided at the pitch junction of the blade. The truncated trailing edge acts to prevent the formation of a trailing edge gap during pitching between the trailing edges of the inner and outer blade sections of a partial pitch blade, thereby reducing the negative impact of air leakage, etc., when pitching a partial pitch blade.

Abstract: A wind turbine blade is described having a pitch system coupling which is adapted to allow fasteners, such as bolts, of such a coupling to be tightened from the inside of the blade. This removes the need for relatively difficult and expensive external maintenance operations to tighten pitch coupling bolts. The coupling is arranged to present first and second internal bearing surfaces, against which the bolts of the pitch coupling can be tightened. The coupling may comprise a shaped end portion of an inner blade section, and/or the pitch system may comprise an additional bolting collar to facilitate this arrangement.

Abstract: A partial pitch wind turbine is described wherein the wind turbine blade has an inner blade section designed for stall-controlled operation and an outer blade section designed for pitch-controlled operation. The different blade profiles for the different sections allow for the efficient operation of the blade while providing for the control of the wind turbine to effectively reduce blade root moments. The outer blade sections can be pitched out of the wind to reduce root moments due to the outer blade sections, while the increasing power capture of the inner blade section maintains nominal power output.

Abstract: A partial pitch wind turbine and an associated control method are described wherein the wind turbine blade comprises an inner blade section designed as a stall-controlled blade and an outer blade section designed as a pitch-controlled blade. During operation of the wind turbine, the outer blade sections are pitched out of the wind to reduce the lift force generated in the outer blade sections, thereby reducing the blade root moments due to reduced moment arms. Meanwhile, the inner blade sections continually produce increasing power output for increasing wind speed, thereby allowing for nominal power output to be maintained while effectively de-rating the outer blade sections.

Abstract: Provided is a blade for a rotor of a wind turbine having a substantially horizontal rotor shaft, said rotor comprising a hub, from which the blade extends substantially radially when mounted, said blade having a chord plane extending between a leading edge and a trailing edge of said blade, a root area closest to the hub, an airfoil area furthest away from the hub, a transition area between the root area and the airfoil area, a first airfoil extending substantially along the entire airfoil area, and a second airfoil separately mounted to the blade, said second airfoil arranged at a mutual distance transverse to the chord plane and extending along the root area of the blades.

Abstract: A partial pitch wind turbine blade in which the pitch system of the blade functions as a lightning receptor. As the pitch system is of a relatively large dimension, it is able to dissipate the effects of a lightning strike without damage, and removes the needs for additional blade features normally used to conduct lightning around or away from the pitch system.

Abstract: A wind turbine blade with a flow guiding device attached to a profiled contour on a pressure side of the blade is described. The flow guiding device has a front surface facing toward an oncoming airflow and comprises at least a first portion, which is angled towards the oncoming airflow and a leading edge of the wind turbine blade.

Abstract: A wind turbine blade (10) for a rotor of a wind turbine (2) is provided with a longitudinally extending flow guiding device (70, 170) attached to the profiled contour. The flow guiding device comprises: a base (90, 190) having a first longitudinal end (91, 191) nearest the root end (16) and a second longitudinal end (92, 192) nearest the tip end (14), a first side (93, 193) nearest the leading edge (18) and a second side (94, 194) nearest the trailing edge (20), as well as a first surface (95, 195) and a second surface (96, 196), the first surface of the base being attached to the profiled contour, and the second surface facing away from the profiled contour. A longitudinally extending substantially plate-shaped element (97, 197) protrudes from the second surface (96, 196) of the base (90, 190).

Abstract: A wind power plant (1) having a lightning protection arrangement comprises a plurality of blades (2) extending radially outwards from a hub (3) and together with said hub forming the rotor. An electrically conductive lightning protection means (4) is arranged between two adjacent blades (2).

Abstract: A wind turbine blade is described wherein the blade comprises a hinged flap provided at the leading edge of the blade. The flap is arranged to hinge when the angle of attack of the incident airflow falls below a pre-defined angle, so that the aerodynamic profile of the blade is altered to reduce the magnitude of the negative lift coefficient of the blade. This reduces strain on the blade in such conditions, and associated fatigue loads on the blade and the wind turbine structure. The flap utilises simple biasing means, and does not require complicated sensor or actuation systems.

Abstract: A balancing method and system for a partial pitch rotor blade for a wind turbine is described. Balancing elements are mounted to the pitch system of the rotor blade, which remove the need for complicated balancing operations to be performed which may affect the structural stability of the rotor blade body. A method is described wherein a suitable compensating balancing weight for mounting to the pitch system may be used, the weight chosen based on the known tip and root weights of standard blade extender and rotor blade parts used.

Abstract: A blade (1) for a rotor of a wind turbine having a substantially horizontal? rotor shaft, said rotor comprising a hub, from which the blade extends substantially radially from said rotor when mounted. The blade (1) has a chord plane (K) extending between the leading edge (5) and the trailing edge (S) of the blade (1). The blade (1) comprises a root area (2) closest to the hub, an airfoil area (4) furthest away from the hub and a transition area (3) between the root area (2) and the airfoil area (4), and comprises a single airfoil along substantially the entire airfoil area (4). The blade (1) comprises at least a first root segment (7) and a second root segment (8) along substantially the entire root area (2), said segments being arranged with a mutual distance, as seen transverse to the chord plane (K). At least one of the root segments (7, 8) has an airfoil profile.

Abstract: A method of manufacturing a longitudinally extending composite structure including a shell part comprising a fibre reinforced polymer material including a polymer matrix and fibre material embedded in the polymer material is described. The shell part is manufactured in a closed mould comprising at least a first outer mould part having a first forming surface and a second outer mould part having a second forming surface. The method comprises the steps of: arranging a first fibre material in the first forming surface of the first outer mould part, arranging a pre-fabricated longitudinally extending reinforcement element, such as a beam or a web, on top of the first fibre material, arranging a second fibre material in the second forming surface of the second outer mould part, and sealing a polymer foil above the second fibre material so as to retain the second fibre material against the second forming surface.