Method and arrangement for detecting a blade pitch angle unbalance of a rotor blade system of a wind turbine

摘要

METHOD AND ARRANGEMENT FOR DETECTING A BLADE PITCH ANGLE UNBALANCE OF A ROTOR BLADE SYSTEM OF A WIND TURBINE Abstract 5 It is described a method and an arrangement for detecting a blade pitch angle unbalance of a rotor blade system of a wind turbine, the rotor blade system rotating around a rotor rotation axis, the method comprising: yawing the rotor rotation axis about a yawing axis transverse, in particular perpendicular, to the rotor rotation axis; obtaining a load signal (y) indicative of a load due to the yawing; analyzing the load signal regarding 1o a frequency component (fl) of the load signal; and detecting the blade pitch angle unbalance based on the analysed load signal. (Figure 1) ---.------------- --------- --- - --- ----- LO) - I-- -- - - - - - -- -- ------ ----------- -- - - cny IJ -------A ------- d p I -- --- --