ACCURATE WIND TURBINE ROTOR SPEED MEASUREMENT

摘要

The following arrangement for determining actual rotor speed in a wind turbine, the wind turbine including a tower, a non-rotating upper part supported by the tower, a rotor having a rotor axis, and a generator for generating electrical power is provided. The arrangement includes: (a) a first sensor unit adapted to be arranged at the non-rotating upper part of the wind turbine to detect a rotational speed of the rotor, (b) a second sensor unit adapted to detect an angular roll speed of the non-rotating upper part, and (c) a processing unit adapted to determine the actual rotor speed by subtracting the angular roll speed detected by the second sensor unit from the rotational speed detected by the first sensor unit is also provided.