Method for load reduction on wind turbine blade pitch bearings
AssigneeSiemens Gamesa Renewable Energy A/S
InventorsJulian Ehlers, Michael Hind, Drew Eisenberg, Alejandro Gomez Gonzalez, Peder Bay Enevoldsen, Lasse Gilling
Life of this patent
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Abstract
Provided is a method for adjusting a pitch angle of a rotor blade connected to a rotor of a wind turbine, the method includes: pitching the rotor blade towards a target blade pitch angle, the manner of pitching depending on a load on a pitch bearing and/or an azimuthal position of the rotor.
Claims15
A method for adjusting a pitch angle of a rotor blade connected to a rotor of a wind turbine, the method comprising:
- pitching the rotor blade towards a target blade pitch angle with a pitch rotational speed that depends on a load on a pitch bearing,
- wherein the pitch rotational speed is adjusted to be lower in a range of azimuthal positions in which the load on the pitch bearing due to aerodynamics and due to gravitation is larger than for other azimuthal positions.
A method for adjusting pitch angles of a first rotor blade and a second rotor blade both connected to a rotor of a wind turbine, the method comprising:
- pitching the first rotor blade with a first pitch rotational speed that depends on a first load on a first pitch bearing, wherein the first pitch rotational speed is adjusted to be lower in a range of azimuthal positions for the first rotor blade in which the load on the first pitch bearing due to aerodynamics and due to gravitation is larger than for other azimuthal positions of the first rotor blade, and
- pitching the second rotor blade with a second pitch rotational speed that depends on a second load on a second pitch bearing, wherein the second pitch rotational speed is adjusted to be lower in a range of azimuthal positions for the second rotor blade in which the load on the second pitch bearing due to aerodynamics and due to gravitation is larger than for other azimuthal positions of the second rotor blade,
- wherein pitching the first rotor blade is independent of pitching the second rotor blade.
An arrangement for adjusting a pitch angle of a rotor blade connected to a rotor of a wind turbine, the arrangement comprising:
- a pitching system configured to pitch the rotor blade towards a target blade pitch angle with a pitch rotational speed that depends on a load on a pitch bearing,
- wherein the pitch rotational speed is adjusted to be lower in a range of azimuthal positions in which the load on the pitch bearing due to aerodynamics and due to gravitation is larger than for other azimuthal positions.
Dependencies are inferred from the claim text.