Vestas Wind Systems A/s

Neg Micon A/s

Thomas Steiniche Bjertrup Nielsen

Bo Juul Pedersen

Kristian Balschmidt Godsk

Christopher John Spruce

Erik Billeskov Sloth

Imad Abdallah

Niels Christian Moller Nielsen

According to the present invention is provided a method of control of noise emission from a wind park in operation, the wind park comprising a plurality of wind turbines. The method comprises the steps of &#x2022; providing measurements of at least one wind speed and of at least one wind direction to a park noise emission emulation module including for each of two or more of the plurality of wind turbines a wind turbine noise emission model being suitable for producing a prediction of noise emission from the wind turbine as a function of at least one operational characteristic, the geographical position of each of the plurality of wind turbines, and the geographical position of at least one noise immission point, &#x2022; emulating the noise level at the at least one noise immission point as a result of noise emitted by the plurality of wind turbines, and &#x2022; controlling the operation of the wind park from the result of the emulation so as to prevent the noise level at the at least one noise immission point from exceeding a predetermined threshold level. Furthermore, the invention relates to a wind park.

Control of wind park noise emission

The invention provides for a wind turbine comprising a rotor comprising at least one rotor blade, a yaw controlling system including yaw control means, a yaw mechanism comprising one or more yaw motors and a yaw bearing, registration means for registering an idling power producing situation of the wind turbine in relation to a utility grid, and detection means for detecting edgewise oscillations in one or more of the blades. The yaw controlling system is adapted for changing the yaw position of the wind turbine nacelle when said registration means registers that said wind turbine is operating in an idling power producing situation and the detection means detects edgewise oscillations in one or more of the rotor blades, hereby damping or eliminating the edgewise oscillations. The invention further relates to a method for controlling a wind turbine and use hereof.

Wind turbine, a method for controlling a wind turbine and use thereof

A method for operating a wind turbine having a rotor with a number of wind turbine blades, wherein the rotor's axis of rotation is tilted in relation to the direction of the incoming wind, includes the steps of determining the azimuth angle (A) of the blades and adjusting the pitch angle of the blades in accordance with the azimuth angle (A) to ensure a substantially constant angle of attack (AoA) during at least a full rotation of the rotor. A wind turbine and use of the method are also contemplated.

Method for operating a wind turbine, a wind turbine and use of the method

A method for damping edgewise oscillations in one or more blades of a wind turbine includes the steps of detecting if one or more of the blades oscillates edgewise during operation of the wind turbine, and substantially cyclically generating a pitch angle difference between at least two of the blades. Further provided is an active stall controlled wind turbine and use hereof.

Method for damping edgewise oscillations in one or more blades of a wind turbine, an active stall controlled wind turbine and use hereof

The invention relates to a wind turbine comprising a rotor including one or more pitchable blades, registration means for registering an idling power producing situation of the wind turbine in relation to a utility grid, detection means for detecting edgewise oscillations in one or more of the blades, and control means for controlling the pitch angle of one or more of the blades. The control means is adapted for changing the pitch angle of one or more of the blades when the registration means registers that the wind turbine is operating in an idling power producing situation and the detection means detects edgewise oscillations in one or more of the blades, hereby damping or eliminating the edgewise oscillations. The invention further relates to a method for controlling a wind turbine and use hereof.

A wind turbine includes a rotor with wind turbine blades each having a root end connected to a hub of the wind turbine and a tip end, the tip end of each of which being equipped with a winglet extending a distance in a direction perpendicularly to a longitudinal direction of the blade. A new and much more slim design of the outer part of the wind turbine blade is disclosed, i.e. with a shorter chord length designed within a narrow band of values defined with respect to the length of the winglet, i.e. the extension in the direction transverse to the longitudinal direction of the blade.

Wind turbine with rotor blades equipped with winglets and blades for such rotor

The invention relates to a pitch controlled wind turbine blade including a pressure surface side and a leeward surface side, where the surfaces establishes a leading edge and a trailing edge. The blade includes a turbulence generating mechanism where the mechanism is placed on the leeward surface sides of the wind turbine blade and at the outer section of the wind turbine blade in direction of the blade tip. The invention further relates to a wind turbine including at least two pitch controlled wind turbine blades and a pitch controlling mechanism for pitching the blades. The blades include a turbulence generating mechanism where the mechanism is placed on the leeward surface sides of the wind turbine blades and at the outer section of the wind turbine blades in direction of the blade tips.

Pitch controlled wind turbine blade, a wind turbine and use thereof

The invention relates to a method for damping tower oscillations in the tower of an active stall controlled wind turbine. The method comprises the steps of operating two or more blades of the wind turbine in a stall condition, detecting if the tower oscillates beyond a predefined level, and establishing different stall conditions between at least two of the blades, wherein the different stall conditions are established by offsetting the pitch angle of at least a first blade in relation to the pitch angle of one further blade. The invention further relates to an active stall controlled wind turbine and use hereof.

Method for damping tower oscillations, an active stall controlled wind turbine and use hereof

The invention relates to a wind turbine comprising a rotor including one or more pitchable blades, and detection means for detecting edgewise oscillations in one or more of said blades. The wind turbine is characterized in that the wind turbine comprises control means for changing the pitch angle of one or more of the blades if the detection means detects edgewise oscillations in one or more of the blades, hereby damping or eliminating the edgewise oscillations. The invention further relates to a method for damping edgewise oscillations in one or more blades of a wind turbine and use hereof.

Wind turbine, a method for damping edgewise oscillations in one or more blades of a wind turbine by changing the blade pitch and use hereof

Damping of oscillations of the first bending mode of a wind turbine is performed means of one or more containers partly filled with a liquid for damping oscillations of the first natural bending frequency of the wind turbine. The damping means comprises a plurality of box shaped containers having a square cross section and being partly filled with liquid so as to provide a unidirectional damping with a logarithmic decrement of oscillations of the first natural bending frequency of the wind turbine of at least 4-8%. For off-shore wind turbines, the combined excitation of the wind and sea waves requires more damping, the damping is preferably equivalent to a logarithmic decrement of 10-15%. Furthermore, the invention relates to damping of oscillation of the second bending mode of a wind turbine and to the combined damping of oscillations of the first as well as the second bending mode of the wind turbine.

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Randers, Denmark

Thomas Steiniche Bjertrup Nielsen