Fatigue Load Measurements and Evaluation of the 25 m HAWT (Horizontal Axis Wind Turbine) at Petten, the Netherlands

摘要

Load measurements on the 25 m Horizontal Axis Wind Turbine (HAWT) have been carried out to establish fatigue load spectra for 7 load channels in 9 modes of operation, i.e., 7 wind speed classes and the start and stop at the cutout wind speed. Special attention has been paid to the location of the zero levels for the different recordings. The fatigue load data have been reduced and counted by the 'Rainflow' method, resulting in 32 x 32 Markov 'from-to' matrices for each combination of wind speed/event class and load channel. Rainflow matrices for one year of operation have been derived. Results will be presented in the form of load-excess spectra.