Patent EP-2481918-A1 (EP)
Inventor: STEINMETZ GUILLAUME
IPC: F03D7/02
Filed: 2011-01-28
Abstract: The method comprises: determining a position of a radar system with respect to a wind turbine, which comprises an elongated stand apparatus (102), a generator rotatably mounted on the stand apparatus and a rotor that is coupled to the generator via a rotor hub (106) and has an elongated rotor blade; and determining an area for the alignment of the rotational axis of the rotor in the direction of the generator as a function of the determined position, which is not intended to be permanently assumed for alignment of the rotational axis about the longitudinal axis of the stand apparatus. The method comprises: determining a position of a radar system with respect to a wind turbine, which comprises an elongated stand apparatus (102), a generator rotatably mounted on the stand apparatus and a rotor that is coupled to the generator via a rotor hub (106) and has an elongated rotor blade; determining an area for the alignment of the rotational axis of the rotor in the direction of the generator as a function of the determined position, which is not intended to be permanently assumed for alignment of the rotational axis about the longitudinal axis of the stand apparatus; determining the area, which is not intended to be permanently assumed for the alignment, as a function of an angle (A) between the rotational axis of the rotor and a straight line on which the radar system and the rotor hub lie; predetermining an absolute geographic coordinate; determining the area, which is not intended to be permanently assumed for the alignment, as a function of an angle (B) between the absolute geographic coordinate and the straight line on which the radar system and the rotor hub lie; determining an angle (F) between the absolute geographic coordinate and the rotational axis of the rotor as a function of the angle (B) between the absolute geographic coordinate and the straight line on which the radar system and the rotor hub lie; determining the area, which is not intended to be permanently assumed for the alignment, as a function of the angle (F) between the absolute geographic coordinate and the rotational axis of the rotor; determining a further area, which is not intended to be permanently assumed for the alignment of the rotational axis of the rotor about the longitudinal axis of the stand apparatus, with the area and the further area each is determined such that the longitudinal direction of the rotor blade is aligned in the direction of the straight line on which the radar system and the rotor hub lie; determining a wind direction (127) flowing over the wind turbine; determining a value for the alignment of the rotational axis of the rotor as a function of the determined wind direction; aligning the rotational axis of the rotor with an edge of the area, which is not intended to be permanently assumed for alignment of the rotational axis of the rotor about the longitudinal axis of the stand apparatus; providing information for the radar system when the rotational axis of the rotor is in the area which is not intended to be permanently assumed for the alignment of the rotational axis of the rotor about the longitudinal axis of the stand apparatus; and operating the wind turbine with the determined area that is not permanently assumed when the rotational axis of the rotor is aligned about the longitudinal axis of the elongated stand apparatus. The method further comprises specifying a first value of the rotational speed of the rotor via a control apparatus as a set-point value; determining a second value for the rotational speed of the rotor via the control apparatus as an actual value; comparing the second value of the rotational speed of the rotor and the first value for the rotational speed of the rotor; changing the rotational speed of the rotor if the second value of the rotational speed of the rotor is greater than or equal to the first value of the rotational speed of the rotor; changing the rotational speed of the rotor to a value, which is less than or equal to the first value of the rotational speed; and regulating the rotational speed of the rotor in dependence upon an operating variable including a measured wind speed and/or the rotational speed of the rotor, when the rotational axis of the rotor is aligned outside the area that is not intended to be permanently assumed for alignment of the rotational axis about the longitudinal axis of the stand apparatus, after changing the rotational speed of the rotor. The two further areas are determined, which are avoided for alignment of the rotational axis of the rotor about the longitudinal axis of the stand apparatus, with the two areas are determined such that the longitudinal direction of the rotor blade is aligned transversely with respect to the straight line on which the radar system and the rotor hub lie. The rotational axis of the rotor is aligned with the edge of the area at which the oblique incident flow is minimal. The first value of the rotational speed corresponds to a rotational speed of the rotor during no-load operation. Independent claims are included for: (1) an arrangement comprising a wind turbine; and (2) a system comprising an arrangement including a wind turbine.