Abstract: A method for operating a wind turbine to avoid stall during derating thereof includes providing an initial pitch setting for one or more rotor blades of the wind turbine. Further, the method includes operating the wind turbine based on a rated power curve with the one or more rotor blades fixed at the initial pitch setting. Further, the method includes identifying at least one condition of the wind turbine that is indicative of stall. The method also includes derating the wind turbine. Further, the method includes modifying the initial pitch setting to an updated pitch setting when the at least one condition is identified.

Abstract: A method for operating a wind turbine to avoid stall during derating thereof includes providing an initial pitch setting for one or more rotor blades of the wind turbine. Further, the method includes operating the wind turbine based on a rated power curve with the one or more rotor blades fixed at the initial pitch setting. Further, the method includes identifying at least one condition of the wind turbine that is indicative of stall. The method also includes derating the wind turbine. Further, the method includes modifying the initial pitch setting to an updated pitch setting when the at least one condition is identified.

Abstract: A system and method for monitoring and controlling the deflection of rotor blades of a wind turbine so as to prevent tower strikes is disclosed. The method includes operating the wind turbine at standard pitch angle settings. Another step includes monitoring a loading condition of the wind turbine over a predetermined time period. A further step includes tracking a number of wind condition deviations of a certain magnitude occurring during a predetermined time period. The method also include altering one or more of the standard pitch settings of the rotor blades in response to the number of wind condition deviations exceeding a wind deviation threshold and/or the loading condition exceeding a loading threshold as an exceedance indicates an increased probability of rotor blade deflection. The method further includes performing one or more additional corrective actions so as to reduce the probability of a rotor blade tower strike.

Abstract: A system and method for monitoring and controlling the deflection of rotor blades of a wind turbine so as to prevent tower strikes is disclosed. The method includes operating the wind turbine at standard pitch angle settings. Another step includes monitoring a loading condition of the wind turbine over a predetermined time period. A further step includes tracking a number of wind condition deviations of a certain magnitude occurring during a predetermined time period. The method also include altering one or more of the standard pitch settings of the rotor blades in response to the number of wind condition deviations exceeding a wind deviation threshold and/or the loading condition exceeding a loading threshold as an exceedance indicates an increased probability of rotor blade deflection. The method further includes performing one or more additional corrective actions so as to reduce the probability of a rotor blade tower strike.

Abstract: A method of controlling a wind turbine that includes at least one rotor shaft and at least one blade operatively coupled to the rotor shaft includes measuring a first wind turbine operational condition that is representative of a blade deflection value and generating a first operational condition signal based on that first wind turbine operational condition. The wind turbine also includes a drive train including at least one rotor shaft and an electric generator. The method also includes measuring at least one second wind turbine operational condition and generating at least one second operational condition signal. The method further includes changing the blade deflection value by changing the second operational condition.

Abstract: A method of controlling a wind turbine that includes at least one rotor shaft and at least one blade operatively coupled to the rotor shaft includes measuring a first wind turbine operational condition that is representative of a blade deflection value and generating a first operational condition signal based on that first wind turbine operational condition. The wind turbine also includes a drive train including at least one rotor shaft and an electric generator. The method also includes measuring at least one second wind turbine operational condition and generating at least one second operational condition signal. The method further includes changing the blade deflection value by changing the second operational condition.

Abstract: A system is disclosed for monitoring and controlling the deflection of turbine blades of a wind turbine. The system includes a passive position detecting apparatus and a controller. The passive position detecting apparatus may be configured to acquire and transmit data relating directly to a position of at least one of the turbine blades. The controller may be configured to receive the data from the passive position detecting apparatus and compare such data to a known position reference to determine turbine blade deflection.