Vestas Wind Systems A/s

Jan Graugaard-Jensen

Martin Ansbjerg Kjær

Kasper Zinck Østergaard

Kasper Zinck Ostergaard

Embodiments of the present invention relate to control of a wind turbine during a recovery period after a grid fault. It is disclosed to operate a wind turbine during the recovery period to determine the actual pitch angle of the rotor blades and the actual wind speed, and based on that determining a desired pitch angle of the rotor blades, as well as a pitch ramp rate so that the actual pitch angle can be brought to match the desired pitch angle before the end of the recovery period. In embodiments, the steps performed in the recovery mode are repeated at intervals during the recovery period.

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Hammel, Denmark

Jan Graugaard-Jensen