Method of diagnosing a wind turbine power generation facility and automatic diagnosis device for wind turbine power generation facility

Abstract

Soundness and a sign of abnormality of a pitch mechanism of a wind turbine blade is quantitatively diagnosed. A method of diagnosing a wind turbine power generation facility includes the steps of: rotating and fixing a wind turbine rotor including at least one wind turbine blade; providing, in a state where the wind turbine rotor is fixed, a pitch control command value to a pitch mechanism that changes a pitch angle of the wind turbine blade, to increase or reduce the pitch angle such that the pitch angle reaches a pitch angle target value from a reference angle; acquiring an actual pitch angular velocity or an actual pitch angle of the wind turbine blade corresponding to the pitch control command value; and diagnosing soundness of the pitch mechanism based on correlation between the acquired actual pitch angular velocity or the acquired actual pitch angle, and the pitch control command value.