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:
Jul. 09, 2013
Filed:
Aug. 23, 2011
Detlef Drossel, Norderstedt, DE;
Detlef Drossel, Norderstedt, DE;
Nordex Energy GmbH, Hamburg, DE;
Abstract
A method controls the rotational speed of a wind turbine having a tower, a nacelle mounted on the tower and a drive train which includes a rotor having at least one rotor blade. The rotor is rotatably mounted about a rotor axis in the nacelle. The drive train further includes a generator configured to be driven by the rotor. In a nacelle-fixed reference system, the rotational speed (ω*) of a component of the drive train which rotates with the rotor in correspondence to a transmission ratio (Ue) is measured. A movement of the nacelle relative to the ground is measured and the rotational speed is controlled to a rotational speed setpoint with a speed controller which outputs a generator torque (M) and/or a blade pitch angle (θ). The measured rotational speed (ω*) is converted into a corrected rotational speed (ω) which corresponds to the rotational speed of the rotor in a ground-fixed reference system multiplied by the transmission ratio (Ue). The corrected rotational speed (ω) is used as the input quantity for the speed controller.