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The present invention relates to a method for curtailing electrical power supplied from a wind turbine or a group of wind turbines to an associated power supply grid, the method comprising the steps of determining an available electrical power level from the wind turbine facility and setting a wind

The present invention relates to a method for curtailing electrical power supplied from a wind turbine or a group of wind turbines to an associated power supply grid, the method comprising the steps of determining an available electrical power level from the wind turbine facility and setting a wind speed independent curtailment level. The curtailment level may be a percentage of an actual available electrical power level or a fixed power level. The method further comprises the step of operating the wind turbine facility in such a way that the generated electrical power supplied from the wind turbine facility equals the difference between an actual available electrical power level and the curtailment level. The present invention further relates to a wind turbine facility and a curtailing controller for carrying out the invention.

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1. A method for curtailing electrical power supplied from a wind turbine, the method comprising: determining an available electrical power level from the wind turbine under an optimum condition at a given wind speed and determining an optimal blade pitch angle for blades of a rotor of the wind turbi

1. A method for curtailing electrical power supplied from a wind turbine, the method comprising: determining an available electrical power level from the wind turbine under an optimum condition at a given wind speed and determining an optimal blade pitch angle for blades of a rotor of the wind turbine, wherein the optimal blade pitch angle corresponds to an optimal aerodynamic efficiency for the rotor at which the available electrical power level from the wind turbine is produced;setting a curtailment level for the wind turbine equal to a fixed power level that is independent of wind speed and determining a curtailed aerodynamic efficiency of the rotor at which the wind turbine generates electrical power equal to the difference between the available electrical power level and the curtailment level at the given wind speed;determining a blade pitch angle offset from the determined curtailed aerodynamic efficiency of the rotor, and wherein the determined curtailed aerodynamic efficiency is determined based on the optimal pitch angle; andadjusting the blade pitch angle of the blades of the rotor to an angle corresponding to the determined blade pitch angle offset so that the generated electrical power supplied from the wind turbine equals a difference between the available electrical power level and the curtailment level at the given wind speed. 2. The method of claim 1, wherein the electrical power supplied from the wind turbine is curtailed by changing a speed of rotation of the rotor of the wind turbine. 3. The method of claim 1, wherein the electrical power supplied from the wind turbine is curtailed by changing a speed of rotation of the rotor of the wind turbine, and by pitching one or more rotor blades of the wind turbine by a predetermined pitching angle. 4. The method of claim 1, wherein the wind turbine is one of a plurality of wind turbines comprising a wind turbine park. 5. The method of claim 1 wherein the wind turbine is operated so that the generated electrical power supplied from the wind turbine equals the difference between the available electrical power level and the curtailment level at all power-producing wind speeds. 6. A wind turbine adapted to generate and supply electrical power to an associated power supply grid, the wind turbine comprising: a rotor including at least one rotor blade;a curtailment controller configured to: determine an available electrical power level from the wind turbine under an optimum condition at a given wind speed;determine an optimal blade pitch angle for the at least one blade of the rotor, wherein the optimal blade pitch angle corresponds to an optimal aerodynamic efficiency for the rotor at which the available electrical power level is produced;to receive or calculate a curtailment level equal to a fixed power level that is independent of wind speed for the wind turbine;determine a curtailed aerodynamic efficiency of the rotor at which the wind turbine generates electrical power equal to the difference between the available electrical power level and the curtailment level at the given wind speed; anddetermine a blade pitch angle offset from the determined curtailed aerodynamic efficiency of the rotor, and wherein the determined curtailed aerodynamic efficiency is determined based on the optimal pitch angle;an arrangement for pitching the at least one rotor blade by a predetermined pitching angle corresponding to the determined blade pitch angle offset in order to comply with the curtailment level,wherein the curtailment controller is further configured to operate the wind turbine so that the generated electrical power supplied from the wind turbine equals a difference between the available electrical power level and the curtailment level. 7. The wind turbine of claim 6, further comprising: an arrangement for changing a speed of rotation of the rotor in order to comply with the curtailment level. 8. The wind turbine of claim 6 wherein the curtailment controller is configured to operate the wind turbine so that the generated electrical power supplied from the wind turbine equals the difference between the available electrical power level and the curtailment level at all power-producing wind speeds. 9. A non-transitory data carrier comprising a computer program product that, when run on a computer, causes the computer to: determine an available electrical power level from a wind turbine under an optimum condition at a given wind speed and determine an optimal blade pitch angle for blades of a rotor of the wind turbine, wherein the optimal blade pitch angle corresponds to an optimal aerodynamic efficiency for the rotor at which the available electrical power level from the wind turbine is produced;set a curtailment level for the wind turbine equal to a fixed power level that is independent of wind speed and determining a curtailed aerodynamic efficiency of the rotor at which the wind turbine generates electrical power equal to the difference between the available electrical power level and the curtailment level at the given wind speed;determining a blade pitch angle offset from the determined curtailed aerodynamic efficiency of the rotor, and wherein the determined curtailed aerodynamic efficiency is determined based on the optimal pitch angle; andadjust the blade pitch angle of the blades of the rotor to an angle corresponding to the determined blade pitch angle offset so that the generated electrical power supplied from the wind turbine equals a difference between the available electrical power level and the curtailment level. 10. A method for curtailing electrical power supplied from a wind turbine, the method comprising: determining an available electrical power level from the wind turbine under optimum operating conditions at a given wind speed and determining an optimal blade pitch angle for blades of a rotor of the wind turbine, wherein the optimal blade pitch angle corresponds to an optimal aerodynamic efficiency for the rotor at which the available electrical power level from the wind turbine is produced;setting a curtailment level for the wind turbine equal to a fixed percentage of the available electrical power level, wherein the fixed percentage is independent of the given wind speed and determining a curtailed aerodynamic efficiency of the rotor at which the wind turbine generates electrical power equal to the difference between the available electrical power level and the curtailment level at the given wind speed;determining a blade pitch angle offset from the determined curtailed aerodynamic efficiency of the rotor, and wherein the determined curtailed aerodynamic efficiency is determined based on the optimal pitch angle;adjusting the blade pitch angle of the blades of the rotor to an angle corresponding to the determined blade pitch angle offset so that the generated electrical power supplied from the wind turbine equals a difference between the available electrical power level and the curtailment level at the given wind speed. 11. The method of claim 10 wherein the electrical power supplied from the wind turbine is curtailed by changing a speed of rotation of the rotor of the wind turbine. 12. The method of claim 10 wherein the electrical power supplied from the wind turbine is curtailed by changing a speed of rotation of the rotor of the wind turbine, and by pitching one or more rotor blades of the wind turbine by a predetermined pitching angle. 13. The method of claim 10, wherein the wind turbine is one of a plurality of wind turbines comprising a wind turbine park. 14. The method of claim 10 wherein the wind turbine is operated so that the generated electrical power supplied from the wind turbine equals the difference between the actual available electrical power level and the curtailment level at all power-producing wind speeds. 15. A wind turbine adapted to generate and supply electrical power to an associated power supply grid, the wind turbine comprising: a curtailment controller configured to: determine an available electrical power level from the wind turbine under an optimum condition at a given wind speed;determine an optimal blade pitch angle for the at least one blade of the rotor, wherein the optimal blade pitch angle corresponds to an optimal aerodynamic efficiency for the rotor at which the available electrical power level is produced;to receive or calculate a curtailment level equal to a fixed percentage of the available electrical power level, the fixed percentage being independent of the given wind speed;determine a curtailed aerodynamic efficiency of the rotor at which the wind turbine generates electrical power equal to the difference between the available electrical power level and the curtailment level at the given wind speed; anddetermine a blade pitch angle offset from the determined curtailed aerodynamic efficiency of the rotor, and wherein the determined curtailed aerodynamic efficiency is determined based on the optimal pitch angle;an arrangement for pitching at least one rotor blade of the wind turbine by a predetermined pitching angle corresponding to the determined blade pitch angle offset in order to comply with the curtailment level,wherein the curtailment controller is further configured to operate the wind turbine so that the generated electrical power supplied from the wind turbine equals a difference between the available electrical power level and the curtailment level at the given wind speed. 16. The wind turbine of claim 15 wherein the curtailment controller is configured to operate the wind turbine so that the generated electrical power supplied from the wind turbine equals the difference between the actual available electrical power level and the curtailment level at all power-producing wind speeds.