The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2012
Filed:
Oct. 30, 2006
Finn Gunnar Nielsen, Bones, NO;
Bjorn Skaare, Bergen, NO;
John Olav G. Tande, Trondheim, NO;
Ian Norheim, Biri, NO;
Kjetil Uhlen, Trondheim, NO;
Finn Gunnar Nielsen, Bones, NO;
Bjorn Skaare, Bergen, NO;
John Olav G. Tande, Trondheim, NO;
Ian Norheim, Biri, NO;
Kjetil Uhlen, Trondheim, NO;
StatoilHydro ASA, Stravanger, NO;
Abstract
A method in connection with a wind turbine installation for damping tower vibrations, in particular a floating wind turbine installation comprising a floating cell, a tower arranged over the floating cell, a generator mounted on the tower that is rotatable in relation to the wind direction and fitted with a wind turbine, and an anchor line arrangement connected to anchors or foundations on the sea bed. The tower's eigenvibrations, ω, are damped by, in addition to control with the controller in the constant power or RPM range of the wind turbine, an increment, Δβ, being added to the blade angle of the turbine blades on the basis of the tower velocities, ΔZ, so that the eigenvibrations are counteracted. The vibrations in β that have frequency ωcan expediently be damped by means of a stabiliser with the transfer function H(s) between the tower velocities, ΔZ, and the blade angle, Δβ, which is such that the loop transfer function H−{jω)H(jω)=−b, which means that: (I) where 'b' is a variable depending on the moment and thrust characteristics of the turbine blades.