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:
Nov. 04, 2014
Filed:
Dec. 09, 2011
Wolfgang Kabatzke, Geesthacht, DE;
Hermann Rochholz, Bozen, IT;
Wolfgang Kabatzke, Geesthacht, DE;
Hermann Rochholz, Bozen, IT;
Nordex Energy GmbH, Hamburg, DE;
Abstract
The invention is directed to a method for operating a pitch-controlled wind turbine having a rotor blade adjustable about its longitudinal axis and having a generator wherein a set-point for a generator torque (M) is specified in dependence upon a rotational speed (n) of the generator or of the rotor. A transition point (n, M) is provided whereat a switchover occurs from a part-load operation to a full-load operation. In the method, a value for air density (ρ) is determined and a pre-pitch angle (φ) is set starting at a pre-pitch rotational speed (n) less than the rotational speed (n) at the transition point (n, M). The value of the pre-pitch angle (φ) is dependent on the value determined for the air density (ρ) so that a larger pre-pitch angle is set when the air density is lower than when the air density is higher.