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.

Evaluation of residue based power oscillation damping control of inter-area oscillations for static power sources

Abstract: Low frequency inter-area oscillations are known stability issue of large interconnected electrical grids. It was demonstrated that additional control loop can be applied for static power sources, like FACTS, HVDC or modern Wind Power Plants, to modulate their power output and successfully attenuate these oscillations. Variety of control design methods were proposed for this service. In this paper focus is given to the most popular technique based on residues. Authors demonstrate on a small 4-machine 12-bus grid that residues may not provide sufficient information for effective damping control design. Hence, it is proposed to give more attention to additional indices like transfer function zero location and interactions between mode of interest and other system dynamics. Consequently, additional rules are proposed for residue based damping control design.

Wind turbine blade pitch system

Abstract: The present invention relates to a pitch system for pitching a blade of a wind turbine by means of a hydraulic fluid, comprising a manifold which comprises a hydraulic cylinder for adjusting a pitch angle of the blade and an accumulator hydraulically connected to the cylinder, the hydraulic fluid having at least one measurable property, wherein the system further comprises a testing unit adapted to measure at least one property of the hydraulic fluid in fluid communication with the accumulator. Furthermore, the invention relates to a method for measuring the property of the hydraulic fluid.

Improvements relating to wind turbine blade manufacture

Abstract: A method of making a wind turbine blade, and the turbine blade resulting form the process, is described in which correct alignment of the shear webs (42a, 42b) upon mould (30) closing is ensured. The method involves providing a first half shell (32a) and a second half shell (32b) to be joined together to form the wind turbine blade. A first edge (46) of a shear web (42) is attached to an inner surface (36a) of the first half shell (32a). A shear web mounting region is defined on an inner surface (36b) of the second half shell (32b). At least one guide block (60a, 60b) is attached to the inner surface (36b) of the second half shell (32b) adjacent to the shear web (42) mounting region. The guide block (60a, 60b) has a guide surface (70) oriented transversely to the inner surface of the second half shell (36b). Upon mould (30) closing, the first and second half shells (32a, 32b) are brought together whilst a second edge (52) of the shear web (42) is guided over the guide surface (70) of the mounting block (60a, 60b) towards the shear web mounting region defined on the inner surface (36b) of the second half shell (32b).

Wind turbine blade with variable blade surface

Abstract: The invention relates to a wind turbine blade comprising a blade body, a device for modifying the aerodynamic surface or shape of the blade and movably connected hereto, and operating mechanisms for controlling the position and/or movement of the device. The operating mechanism comprises a compressible pressure chamber arranged in relation to the blade body and the movable device such that the position and/or movement of the device relative to the blade body can be modified by changing the pressure in the pressure chamber thereby causing a change of its cross sectional diameter. The operating mechanisms may be connected to and driven by a pressure reservoir arranged within the wind turbine blade or for example constituted by parts of the blade spar.

Control of a wind power plant

Abstract: The present invention relates to a method for controlling a wind power plant, WPP, comprising a plurality of wind turbine generators, WTGs, connected to an electrical grid, the method comprising: setting a plant power reference (Ptotal) according to an electrical value of the electrical grid;determining an inertia delta power reference (IRdeltaP)required for the WPP to meet a power demand in response to a change in the electrical value;adding the inertia delta power reference and the plant power reference (Ptotal) to form a power reference (Ptotalref);deriving an overboost reference (PrefOB) as the difference between the power reference (Ptotalref) and an available power value;dispatching the power reference (Ptotalref) to each wind turbine generator;dispatching the overboost reference (PrefOB) to each wind turbine generator. The invention also relates to a wind power plant control system and a wind power plant comprising a control system.