公开(公告)号：US20170241404A1

公开(公告)日：2017-08-24

申请号：US15507891

申请日：2015-08-28

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Jacob Krogh KRISTOFFERSEN

IPC: F03D7/02 ,  F03D7/04 ,  F03D1/06

Abstract: A method and system for improving the balance of a rotor in a wind turbine, including; determining blade load data associated with a selected rotor blade pair; determining, based on the blade load data, pitch imbalance data associated with the selected rotor blade pair, wherein the pitch imbalance data associated with a rotor blade pair is based on measurements of at least blade loading, rotor speed and wind speed; and, determining and applying pitch control inputs to one or both of the selected rotor blade pair in order to reduce the severity of the rotor imbalance.

公开(公告)号：US20180171974A1

公开(公告)日：2018-06-21

申请号：US15735524

申请日：2016-06-09

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Martin Ansbjerg KJÆR ,  Jesper Sandberg THOMSEN ,  Jacob Krogh KRISTOFFERSEN ,  Jacob Deleuran GRUNNET

IPC: F03D7/02

CPC classification number: F03D7/028 ,  F05B2270/1033 ,  F05B2270/309 ,  F05B2270/335 ,  Y02E10/723

Abstract: The invention relates to a control system for a wind turbine. The wind turbine comprises a power generator configured to generate power dependent on a power request. The control system comprises a ramp rate limiter configured to restrict a rate of change of the power request according to a rate of change limit and configured to determine the rate of change limit dependent on a power difference between the power request and an estimated available wind power.

公开(公告)号：US20170122289A1

公开(公告)日：2017-05-04

申请号：US15320209

申请日：2015-06-15

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Jacob Krogh KRISTOFFERSEN ,  Søren SØRENSEN

IPC: F03D7/02 ,  F03D7/04 ,  F03D1/06

CPC classification number: F03D7/0224 ,  F03D1/0675 ,  F03D7/024 ,  F03D7/047 ,  F05B2270/20 ,  F05B2270/304 ,  F05B2270/32 ,  F05B2270/327 ,  F05B2270/328 ,  F05B2270/329 ,  F05B2270/331 ,  Y02E10/721 ,  Y02E10/723

Abstract: A wind turbine is controlled in response to an estimate of vertical and/or horizontal wind shear. A tilt moment is estimated from flapwise and edgewise blade bending moments, azimuth and blade pitch positions and used to estimate vertical wind shear. A yaw moment is also estimated from flapwise and edgewise blade bending moments, azimuth and pitch position and used to estimate horizontal wind shear. A tip speed ratio is determined from an estimate of wind velocity over the rotor plane and is used to set a blade pitch angle which is passed to a blade pitch controller. The pitching may be collective or individual. In the latter case, the tip speed ratio is determined from a plurality of rotor plane positions to derive a cyclic pitch reference for each blade.

公开(公告)号：US20180156196A1

公开(公告)日：2018-06-07

申请号：US15735513

申请日：2016-06-09

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Martin Ansbjerg KJÆR ,  Jesper Sandberg THOMSEN ,  Jacob Krogh KRISTOFFERSEN ,  Jacob Deleuran GRUNNET ,  Eik HERBSLEB

IPC: F03D7/02

Abstract: The invention relates to a control system for a wind turbine. The wind turbine comprises a power generator configured to generate power dependent on a power reference and a pitch system configured to adjust the pitch of a blade of the wind turbine dependent on a pitch request. The control system comprises a controller configured to determine the pitch request dependent on an adjustable gain. A gain scheduler comprised by the control system is configured to set the adjustable gain to an increased gain value if a rate of change of the power reference, e.g. an external power reference, exceeds a threshold.

公开(公告)号：US20180066630A1

公开(公告)日：2018-03-08

申请号：US15559797

申请日：2016-03-16

Applicant: VESTAS WIND SYSTEMS A/S

Inventor： Jacob Krogh KRISTOFFERSEN

IPC: F03D7/02 ,  F03D7/04

CPC classification number: F03D7/0296 ,  F03D7/0224 ,  F03D7/0292 ,  F03D7/046 ,  F05B2270/32 ,  F05B2270/332 ,  F05B2270/334 ,  Y02E10/723

Abstract: Embodiments herein describe using a tower damping system to reduce oscillations in a wind turbine. To do so, the dampening system may use a metric that is decoupled from the activation strategy in order to control the blade pitch and avoid or mitigate feedback loops. In one embodiment, the dampening system measures a force on the turbine that is correlated to a fatigue loading on the tower. Furthermore, the turbine may perform a calculation to decouple the force from the activation strategy. That is, the turbine determines the value of the force as if the damping system was not activated or present. In addition, the dampening system uses the current wind speed and a wind distribution to generate a pitch reference value. The dampening system may use both the pitch reference value and the fatigue loading on the tower to reduce the tower oscillations.