公开(公告)号：US20170314533A1

公开(公告)日：2017-11-02

申请号：US15528441

申请日：2015-11-20

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Martin ATZLER ,  Thomas SCHEEL ,  Lars Finn Sloth LARSEN ,  Thomas KRÜGER

IPC: F03D7/02 ,  G05B19/402 ,  F03D17/00 ,  G01P5/00

CPC classification number: F03D7/0224 ,  F03D7/022 ,  F03D7/0276 ,  F03D7/046 ,  F03D17/00 ,  F05B2270/304 ,  F05B2270/32 ,  F05B2270/327 ,  F05B2270/328 ,  F05B2270/708 ,  G01P5/00 ,  G05B19/402 ,  G05B2219/2619 ,  Y02E10/723

Abstract: A method for iteratively estimating a wind speed at a wind turbine is disclosed, said wind turbine comprising a rotor carrying a set of wind turbine blades, each wind turbine blade having a variable pitch angle. A minimum tip speed ratio, λmin, is derived, based on an obtained pitch angle, θ. The minimum tip speed ratio, λmin, defines a limit between a stable and an unstable control region. An initial tip speed ratio, λinit>λmin, is selected, and an initial estimated wind speed, vinit, is derived based on the initial tip speed ratio, λint, and an obtained rotational speed, ω, of the rotor. An estimated wind speed, vest, is iteratively derived, based on the obtained rotational speed, ω, and the obtained pitch angle, ω, and using the derived initial estimated wind speed, vinit, as a starting point. The iterative process converges fast and reliably.

公开(公告)号：US20170321660A1

公开(公告)日：2017-11-09

申请号：US15528450

申请日：2015-11-20

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Martin ATZLER ,  Thomas SCHEEL ,  Lars Finn Sloth LARSEN

IPC: F03D17/00 ,  G01P5/00 ,  G05B17/02 ,  F03D7/02

Abstract: A method for estimating a wind speed at a wind turbine is disclosed, said wind turbine comprising a rotor carrying a set of wind turbine blades, each wind turbine blade having a variable pitch angle. A blade torsion contribution, representing torsion introduced in the wind turbine blades, is derived, based on an obtained rotational speed, ω, of the rotor, and an obtaining a pitch angle, θ, of the wind turbine blades. An adjusted pitch angle, θ′, is calculated as a sum of the obtained pitch angle, θ, and the derived blade torsion contribution, and a wind speed, vest, is estimated, based on the obtained rotational speed, ω, and the calculated adjusted pitch angle, θ′. An accurate and reliable estimate for the wind speed is thereby obtained. The wind turbine may be controlled in accordance with the estimated wind speed, vest.