Method and device for individually pitching blades of a wind turbine
AssigneeSiemens Gamesa Renewable Energy A/S
InventorJohannes Gerhardes Wardjan Alberts
Life of this patent
Estimating the term…
Abstract
A method and a device for pitching blades of a wind turbine is provided. The wind turbine is configured to collectively pitch all blades by a collective pitching degree and to individually pitch each blade by an individual pitching degree. If it is determined that at least one blade is unable to reach its individual pitch reference, the individual pitch reference for this blade is prioritized against the collective pitch reference.
Claims7
A method of pitching blades of a wind turbine, the wind turbine comprising a rotor having a plurality of rotor blades, each blade being configured to be pitched by a pitch angle about a pitch axis of the blade, the rotor being mounted to a nacelle to rotate about a rotation axis with a rotor speed to drive a generator for producing electrical energy, the nacelle being mounted to a tower, wherein the wind turbine is configured to collectively pitch all blades by a collective pitching degree and to individually pitch each blade by an individual pitching degree, wherein each blade is configured to be pitched towards a production direction, wherein the power for driving the generator is increased, and towards a stop direction, wherein the power for driving the generator is decreased;
- the method comprising:
- determining a collective pitch reference for all blades;
- determining an individual pitch reference for each blade;
- determining whether at least one blade is unable to reach the individual pitch reference;
- if it is determined that the at least one blade is unable to reach the individual pitch reference, prioritizing the individual pitch reference for the at least one blade against the collective pitch reference by shifting the collective pitch reference towards the stop direction;
- and
- pitching each blade according to the individual pitch references and the shifted collective pitch reference.
A device for pitching blades of a wind turbine, the wind turbine comprising a rotor having a plurality of rotor blades, each blade being configured to be pitched by a pitch angle about a pitch axis of the blade, the rotor being mounted to a nacelle to rotate about a rotation axis with a rotor speed to drive a generator for producing electrical energy, the nacelle being mounted to a tower, wherein the device is configured to collectively pitch all blades by a collective pitching degree and to individually pitch each blade by an individual pitching degree, wherein each blade is configured to be pitched towards a production direction, wherein the power for driving the generator is increased, and towards a stop direction, wherein the power for driving the generator is decreased;
- the device comprising:
- a controller configured to:
- determine a collective pitch reference for all blades;
- determine an individual pitch reference for each blade;
- determine whether at least one blade is unable to reach the individual pitch reference;
- prioritize the individual pitch reference for the at least one blade against the collective pitch reference, by shifting the collective pitch reference towards the stop direction, if it is determined by the third determining unit that the at least one blade is unable to reach the individual pitch reference;
- and
- pitch each blade according to the individual pitch references and the shifted collective pitch reference.
Dependencies are inferred from the claim text.