A first aspect of the invention provides a pitch controlled wind turbine comprising a tower, a nacelle mounted on the tower, a hub mounted rotatably on the nacelle, and at least three wind turbine blades, wherein each wind turbine blade extends between a root end connected to the hub via a pitch mechanism, and a tip end, wherein each wind turbine blade comprises: a first blade portion having a shell that defines a suction side, a pressure side, a leading edge, a trailing edge, and a first spar cap portion, the first blade portion further including a first blade portion end surface at one end of the first blade portion; a second blade portion having a shell that defines a suction side, a pressure side, a leading edge, a trailing edge, and a second spar cap portion, the second blade portion further including a second blade portion end surface at one end of the second blade portion, wherein the first blade portion and the second blade portion are configured to be coupled together at the first and second blade portion end surfaces; and a connection joint for coupling the first and second blade portions together, wherein the connection joint includes a connector for connecting to the first blade portion end surface and to the second blade portion end surface, and wherein the pitch controlled wind turbine further comprises at least three blade connecting members, each wind turbine blade comprising a first connection point and a second connection point, wherein each blade connecting member extends between from a first connection point on one wind turbine blade and towards a second connection point on a neighbouring wind turbine blade, where each connection point on a given wind turbine blade is on the connector of the connection joint of that wind turbine blade.

A Leading Edge Protection (LEP) coating composition is characterized by comprising a curable polyurethane material. The polyurethane material is a solvent-free two component polyurethane material comprising: Component A includes at least 10% by weight of biobased carbon polycarbonate diol in respect of the total weight of Component A, calculated according to method C14 using ASTM D6866; and one or more additives wherein the total quantity of additives is in the range of 5-15% by weight in the respect of the weight of the total Component A; and Component B includes an aliphatic isocyanate with an isocyanate (NCO) content between 10-25%; and uses thereof.

A repair device and method for repairing damage around the leading edge of a wind turbine blade (20) are provided. The repair device includes a robotic maintenance device (40) and an unmanned aerial vehicle (UAV) (62) that can move the maintenance device (40) between a storage position and an operation position, the former being mounted on a blade (20) of the wind turbine (10). The UAV (62) hovers and remains connected to the maintenance device (40) during operations at the blade (20) to minimize a total operational downtime needed to conduct the repair actions. The UAV (62) is secured to the maintenance device (40) by at least one support line (68) that carries the weight load of the maintenance device (40) and at least two control lines (72) that prevent undesired rotations of the maintenance device (40), thereby improving precision and accuracy of UAV-driven movements of the maintenance device (40). A transport container (24) may also be provided to define the storage position, the transport container (24) including an elongated slot (70) for guiding movement of the lines (68, 72) and the maintenance device (40) during movements into and out of a storage space within the container (24).

A root portion for a wind turbine blade is provided, including: an inner wall, an outer wall, a filler, an inner volume, mounting inserts, and a transversal holding arrangement, wherein the transversal holding arrangement includes at least one inlay beam extending from the inner wall and/or the outer wall into a mounting insert hole of at least one mounting insert for holding the mounting insert in the root portion during operation of the wind turbine blade, and wherein the mounting insert hole is a through hole and the at least one inlay beam extends from the inner wall through the mounting insert hole to the outer wall. A wind turbine blade with the root portion, a method of producing the root portion and a method for modifying a root portion is further provided.

The present disclosure provides a modified polyurethane material with excellent rain erosion resistance and weather resistance, and a preparation method and use thereof. In the present disclosure, a hydroxyl-terminated liquid fluoro rubber and a hydroxyl-terminated silane are adopted as modification materials to introduce silicon-containing and fluorine-containing materials into polyurethane. In addition, a filler and a corresponding additive are added, and physical cross-linking points are formed from the filler to further adsorb hydroxyl-terminated silicon/fluorine, so as to produce a homogeneous material. In this way the modified polyurethane material with excellent rain erosion resistance and weather resistance is obtained.

A first aspect of the invention provides a pitch controlled wind turbine comprising a tower, a nacelle mounted on the tower, a hub mounted rotatably on the nacelle, and at least three wind turbine blades, wherein each wind turbine blade extends between a root end connected to the hub via a pitch mechanism, and a tip end, the wind turbine further comprising at least three blade connecting members, each blade comprising a first connection point and a second connection point, wherein each blade connecting member extends from a first connection point on one wind turbine blade towards a second connection point on a neighbouring wind turbine blade, where each connection point on a given wind turbine blade is arranged at a distance from the root end and at a distance from the tip end of the wind turbine blade and adjacent a leading edge of the wind turbine blade, and wherein each connecting member is independently moveable in two orthogonal directions at the respective first and second connection points to which it attaches.

Proposed is a wind turbine blade with a lightning protection receptor. The wind turbine blade with a lightning protection receptor is a technology that allows for excellent lightning capture rate for both negative and positive lightning by improving lightning measures for conventional wind turbines, which are vulnerable to positive lightning, in line with the increasing wind turbine heights for large-scale power generation and the trend toward offshore wind power, and that minimizes post-repair/supplementary measures by limiting blade damage/coating peeling due to lightning strikes to a narrow area, unlike in the conventional case where damage or peeling of the coating occurs over the entire area of a blade when struck by lightning on an edge wire inserted into the lateral inner side of the blade.

Provided is a wing structure comprising a wing body formed from fiber-reinforced plastic (FRP), and an erosion suppression layer provided so as to cover at least a portion of a front edge of the wing structure. The erosion suppression layer contains a thermal spraying layer configured so as to maintain, by having a prescribed surface roughness, a liquid film formed on the erosion suppression layer.

A wind turbine rotor blade is provided including an inboard region and an outboard region including a spanwise section associated with the development of an unstable aeroelastic mode. The disclosed rotor blade includes a leading-edge corrective mass arranged within the spanwise section, which leading-edge corrective mass is adapted to move the center of mass of the spanwise section towards the leading edge in order to suppress the development of an unstable aeroelastic mode. A method of manufacturing a wind turbine rotor blade is also provided.

The invention relates to a wind turbine blade, preferably the leading edge of a wind turbine blade, coated with a coating composition comprising: (A) at least one polyaspartic selected from the group consisting of polyaspartic esters, polyetheraspartic esters and mixtures thereof; and (B) at least one aliphatic polyisocyanate prepolymer curing agent: wherein component B further comprises an aliphatic polyisocyanate which is different to the at least one aliphatic polyisocyanate prepolymer curing agent.