Reduction of a pitch bearing damage
AssigneeSiemens Gamesa Renewable Energy A/S
InventorsJohannes Gerhardes Wardjan Alberts, Gustav Hoegh
Life of this patent
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Abstract
A method of determining a value of a pitch speed for a pitch actuator of at least one rotor blade of a wind turbine includes: providing a quantity being indicative of a value of a bearing moment of the rotor blade; determining the value of a pitch speed based on the quantity and a reference quantity indicative of a reference value of the bearing moment of the rotor blade such that, if the quantity indicates that the value of a bearing moment of the rotor blade is below the reference value of the bearing moment of the rotor blade, the value of a pitch speed is determined to be above a reference value of the pitch speed.
Claims15
A method of determining a value of a pitch speed for a pitch actuator of a rotor blade of a wind turbine and adjusting a pitch angle of the rotor blade, the method comprising:
- providing a quantity being indicative of a value of a bearing moment of the rotor blade;
- determining the value of the pitch speed based on the quantity and a reference quantity indicative of a reference value of the bearing moment of the rotor blade,
- wherein, when the quantity indicates that the value of the bearing moment of the rotor blade is below the reference value of the bearing moment of the rotor blade,
- the value of the pitch speed is determined to be above a reference value of the pitch speed,
- wherein the value of the pitch speed is determined based on a parameter related to a low value of the bearing moment,
- wherein the parameter related to the low value of the bearing moment indicates at which bearing moment the value of the pitch speed should be a maximal value of the pitch speed;
- and
- adjusting, by the pitch actuator, the pitch angle of the rotor blade based on a target pitch angle and the determined value of the pitch speed.
An arrangement for determining a value of a pitch speed for a pitch actuator of a rotor blade of a wind turbine, the arrangement comprising:
- a processor, configured to:
- receive a quantity being indicative of a value of a bearing moment of the rotor blade;
- determine the value of the pitch speed based on the quantity and a reference quantity indicative of a reference value of the bearing moment of the rotor blade,
- wherein, when the quantity indicates that the value of the bearing moment of the rotor blade is below the reference value of the bearing moment of the rotor blade,
- the value of the pitch speed is determined to be above a reference value of the pitch speed,
- wherein the value of the pitch speed is determined based on a parameter related to a low value of the bearing moment,
- wherein the parameter related to the low value of the bearing moment indicates at which bearing moment the value of the pitch speed should be a maximal value of the pitch speed;
- and
- output a signal for adjusting a pitch angle of the rotor blade based on a target pitch angle and the determined value of the pitch speed.
Dependencies are inferred from the claim text.