| 主权项 |
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:
determining a respective frequency quantity indicative of a vibration of each of the plurality of rotatable blades, andcalculating an average of the determined respective frequency quantities of the plurality of rotatable blades, the calculated average indicative of the common blade frequency,wherein the peak detector determines at least in part the common blade frequency by selecting a frequency value from blade edge frequency values whose associated frequency spectrum comprises a highest signal value in a region around the common blade frequency,wherein the frequency spectrum of the vibration quantity comprises at least one peak corresponding to a vibration quantity having a maximum signal in a frequency range of the peak being equal to or approximating the common blade frequency, and 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. |
