Patent ID: 9316206
Filing Date: 2016-04-19
CPC Classification: F03D,F05B,Y02E

Claim Text:
1. A method regarding a wind turbine, the method comprising: determining a common blade frequency resulting from a common vibrational movement due to mutual interactions between members of a rotor in a wind turbine, the wind turbine comprising a tower, a nacelle, and a plurality of rotatable blades, each rotatable blade having a blade edge frequency; measuring, using an accelerometer or a strain gauge, a vibration quantity indicative of a vibration of the tower or nacelle of the wind turbine, wherein the determining of the common blade frequency is performed by way of signal processing in a frequency domain or in a time domain with a determining unit and a peak detector, wherein the common blade frequency is based on the measured vibration quantity, and wherein the determining of the common blade frequency comprises: setting in a controller of the wind turbine an operational mode of the wind turbine based on the determined common blade frequency, the setting of the operational mode comprising at least one of setting the wind turbine in a shutdown mode, setting the wind turbine in a standby mode, and changing a rotor rotational speed.