Patent ID: 8428784

Claim:
A method for operation of a wind power plant ( 11 ) with a rotor ( 10 ) and a rotating apparatus ( 20 , 22 , 24 ) connected with the rotor ( 10 ), wherein a rotor speed (n R ) and a rotating apparatus speed (n) are interrelated via a specifiable transmission ratio, comprising steps of: determining the rotating apparatus speed (n), wherein for the determination of the rotating apparatus speed (n) a rotational speed measurement value (rpm i ) is captured by a measurement device, correcting the rotational speed measurement value (rpm i ) to eliminate a measurement error caused by inaccuracy of the measurement device with an intermittently variable correction value (rpm i,c ), such that the determined rotating apparatus speed (rpm i,f ) results, and feeding the determined rotating apparatus speed (rpm i,f ) to a regulation apparatus ( 36 ) of the wind power plant ( 11 ) as an actual value wherein a difference or a quotient of the rotational speed measurement value (rpm i ) to a rotational speed measurement value average ( rpm i ) is made for the determination of the correction value (rpm i,c ) of the rotational speed measurement value (rpm i ) wherein a rotational speed measurement value average ( rpm i ) of the rotational speed measurement value (rpm i ) captured during a revolution is formed for each full revolution of the rotating apparatus ( 20 , 22 , 24 ) wherein a fitting curve ( 46 ), is formed between two consecutive rotational speed measurement value averages ( rpm i , rpm i+1 ), wherein a difference or a quotient of the rotational speed measurement value (rpm i ) to the fitting curve ( 46 ) is also formed for the determination of the correction value (rpm i,c ) of the rotational speed measurement value (rpm i ), and wherein the formed differences or quotients are filtered for the determination of the rotating apparatus speed (n, rpm i,f ) of the rotating apparatus ( 20 , 22 , 24 ).