Vestas

About: Vestas is a company organization based out in Aarhus, Denmark. It is known for research contribution in the topics: Turbine & Wind power. The organization has 1075 authors who have published 1519 publications receiving 23285 citations. The organization is also known as: Vestas Wind Systems & Vestas Wind Systems A/S.

Spherical plain bearing pocket arrangement and wind turbine having such a spherical plain bearing

Abstract: A plain bearing assembly for a wind turbine includes a bearing housing having a passageway configured to receive a shaft and a bearing surface defining the passageway and having a generally spherical configuration. The bearing surface includes lower and upper portions defined relative to a first midline plane and first and second sides defined relative to a second midline plane. A plurality of fluid cavities is in the bearing surface including a first group of fluid cavities located at a first longitudinal position and a second group of fluid cavities located at a second longitudinal position. The first group of fluid cavities defines a cavity pattern that is different than the cavity pattern defined by the second group of fluid cavities. A wind turbine having such a plain bearing assembly is also disclosed.

Method of manufacturing a laminated composite item by a winding process, related apparatus and product

Abstract: The present invention relates to a method of manufacturing a laminated composite item(l). The method may comprise the step of winding successive overlapping helical convolutions of resin impregnated tape (2) onto a mandrel (3) while advancing the tape back and forth along the mandrel. Sections of the tape being wound onto the mandrel near an end of the mandrel are folded to obtain an end surface of the composite item which is substantially-perpendicular to a longitudinal axis of the composite item. The present invention further relates to an alternative method of manufacturing a laminated composite item. This method comprises the steps of winding successive overlapping helical convolutions of resin impregnated first tape onto a mandrel while advancing the tape back and forth along the mandrel, and winding layers of a second tape having a straight edge (8a) and a serrated edge (8b) onto an end section of the mandrel to obtain an end surface of the composite item which is substantially perpendicular to a longitudinal axis of the composite item. The invention further relates to apparatuses for carrying out such methods and for wind turbine blade spars manufactured by such methods or by use of such apparatuses.

Method of manufacturing a spar for a wind turbine from elements comprising different materials

Abstract: The invention provides a method of manufacturing a spar (1) for a wind turbine blade. The method comprises steps of providing at least two caps (2a, 2b), each cap forming an intermediate portion (4) between two end portions (5), where the end portions each forms a cap joint surface portion (6) along a longitudinal extending edge of the end portion and the intermediate portion forms an outer surface portion (7) of the spar, providing at least two webs (3a, 3b), each web being provided with web joint surface portions (8) along opposite and longitudinally extending edges, and connecting the joint surface portions of the caps with the joint surface portions of the webs to form a tubular configuration of the spar. The intermediate portions and the end portions are provided so that they comprise different materials.

Sub-synchronous resonance damping

Abstract: A method is provided of controlling a doubly fed induction generator- (DFIG) wind turbine converter system if a sub-synchronous resonance event acts on the wind turbine. According to the method a sub-synchronous resonance event is detected. Thereupon, a switch from a non- SSR-control mode to a SSR-control mode is performed. At least one of the following activities is performed in the SSR-control mode, namely: (i) freezing rotor AC voltages in magnitude and phase, (ii) altering at least one rotor-current-controller gain (iii) altering at least one rotor-current-controller time constant, to dampen the effect of the SSR-event on the wind turbine.