A method for estimating a wind speed including calculating a pitch angle adjusted for blade torsion

A wind turbine comprising a rotor carrying a set of wind turbine blades, each wind turbine blade having a variable pitch angle;

• and a controller configured to implement an operation, comprising:
• obtaining a rotational speed, ω, of the rotor,
• obtaining a pitch angle, θ, of the wind turbine blades,
• deriving a blade torsion contribution, based on the obtained rotational speed, ω, and the obtained pitch angle, θ,
• calculating an adjusted pitch angle, θ′, as a sum of the obtained pitch angle, θ, and the derived blade torsion contribution, and
• estimating a wind speed, vest, based on the obtained rotational speed, ω, and the calculated adjusted pitch angle, θ′.

A computer program product comprising computer readable executable code which, when executing on one or more processors, implements an operation, comprising:

• obtaining a rotational speed, ω, of the rotor,
• obtaining a pitch angle, θ, of the wind turbine blades,
• deriving a blade torsion contribution, based on the obtained rotational speed, ω, and the obtained pitch angle, θ,
• calculating an adjusted pitch angle, θ′, as a sum of the obtained pitch angle, θ, and the derived blade torsion contribution, and
• estimating a wind speed, vest based on the obtained rotational speed, ω, and the calculated adjusted pitch angle, θ′.