Siemens Gamesa Renewable Energy A/s

Bjarne Skovmose Kallesøe

Johannes Gerhardes Wardjan Alberts

Peder Bay Enevoldsen

Alejandro Gomez Gonzalez

Liekele Broersma

Erik Steven Haugen

Johannes Gerhardes Alberts

A method of determining a distance between a rotor blade tip and a tower of a wind turbine includes: estimating the distance based on a strain measurement; measuring the distance; correcting an estimation procedure based on the estimated distance and the measured distance; and deriving a corrected distance based on the corrected estimation procedure.

Determining tower to tip clearance for a wind turbine

A control arrangement for a variable-speed wind turbine includes a loading analysis module configured to analyse a number of environment values to establish whether the momentary wind turbine loading is lower than a loading threshold when the rotational speed of the aerodynamic rotor has reached its rated value; and a speed boost module configured to determine a speed increment for the rotational speed of the aerodynamic rotor if the wind turbine loading is lower than the loading threshold.

Wind turbine control arrangement

A load mitigation arrangement of a non-mounted rotor blade, includes at least one actuatable lift-modification device arranged on a surface of the rotor blade; a monitor configured to estimate the magnitudes of loads acting on the non-mounted rotor blade; a controller configured to actuate the lift-modification device on the basis of the estimated magnitudes to mitigate the loads acting on the non-mounted rotor blade. Further provided is a rotor blade assembly, and a method of performing load mitigation on a non-mounted rotor blade.

Load mitigation arrangement

A method of controlling a wind turbine includes the step of boosting the output power of the wind turbine above the nominal power of the wind turbine, according to a boost operational function representing a boost level for the wind turbine. The boost operational function is a crescent function of an operational variable at least between a first threshold value and a second threshold value of the operational variable.

Power boost for a wind turbine

A device and a method of controlling blade instabilities of a wind turbine is provided. The method including the following steps: defining at least one preliminary overspeed threshold value; defining a fluttering rotor speed at and above which a predetermined fluttering of at least one of the blades occurs, the fluttering rotor speed is defined as a function of the pitch angle and/or as a function of the wind speed; setting a final overspeed threshold value to be equal to or smaller than a minimum rotor speed of the at least one preliminary overspeed threshold value and the fluttering rotor speed at the actual pitch angle and/or at the actual wind speed; and controlling the rotor speed to not exceed the final overspeed threshold value.

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Bjarne Skovmose Kallesøe