Controlling power output of a wind turbine at below-rated wind speed
AssigneeVestas Wind Systems A/S
InventorsFabio Caponetti, James Alexander Nichols, Benjamin Rowlinson
Life of this patent
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Abstract
There is provided a method of controlling power output of a wind turbine at below-rated wind speed, the method comprising: determining an indication of blade torsion of one or more rotor blades of the wind turbine in dependence on wind speed and/or rotor speed; determining a torsion-corrected blade pitch based on the indication of blade torsion; and using the torsion-corrected blade pitch to control pitch the one or more rotor blades.
Claims20
A method of controlling power output of a wind turbine at below-rated wind speed, the method comprising:
- determining an indication of blade torsion of one or more rotor blades of the wind turbine based on a predetermined relationship between the blade torsion and at least one of a wind speed and a rotor speed;
- calculating a tip-speed ratio based on the rotor speed and the wind speed;
- determining a torsion-corrected blade pitch based on the indication of blade torsion and the tip-speed ratio, wherein determining the torsion-corrected blade pitch comprises determining a first blade pitch based on the tip-speed ratio, determining a second blade pitch based on the indication of blade torsion, and comparing the first and second blade pitches to determine the torsion-corrected blade pitch;
- and
- using the torsion-corrected blade pitch to control pitch of the one or more rotor blades.
A controller for controlling power output of a wind turbine at below-rated wind speed, the controller being configured to:
- determine an indication of blade torsion of one or more rotor blades of the wind turbine in dependence on wind speed and rotor speed;
- calculate a tip-speed ratio based on the rotor speed and the wind speed;
- determine a torsion-corrected blade pitch based on the indication of blade torsion and the tip-speed ratio, wherein determining the torsion-corrected blade pitch comprises determining a first blade pitch based on the tip-speed ratio, determining a second blade pitch based on the indication of blade torsion, and comparing the first and second blade pitches to determine the torsion-corrected blade pitch;
- and
- send a control signal to command pitch control of the one or more rotor blades using the torsion-corrected blade pitch.
A wind turbine, comprising:
- a tower;
- a nacelle disposed on the tower;
- a rotor extending from the nacelle and having a plurality of blades disposed on a distal end thereof;
- a controller configured to:
- determine an indication of blade torsion of one or more rotor blades of the wind turbine in dependence on wind speed and rotor speed;
- calculate a tip-speed ratio based on the rotor speed and the wind speed;
- determine a torsion-corrected blade pitch based on the indication of blade torsion and the tip-speed ratio, wherein determining the torsion-corrected blade pitch comprises determining a first blade pitch based on the tip-speed ratio, determining a second blade pitch based on the indication of blade torsion, and comparing the first and second blade pitches to determine the torsion-corrected blade pitch;
- and
- send a control signal to command pitch control of the one or more rotor blades using the torsion-corrected blade pitch.
Dependencies are inferred from the claim text.