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A wind turbine with a rotor comprising one or more rotor blades and a hub, the hub being attached to a nacelle, a yaw system for rotating the rotor to orient it in a wind direction, and one or more line of sight detectors for detecting a component of wind velocity. The one or more detectors are moun

A wind turbine with a rotor comprising one or more rotor blades and a hub, the hub being attached to a nacelle, a yaw system for rotating the rotor to orient it in a wind direction, and one or more line of sight detectors for detecting a component of wind velocity. The one or more detectors are mounted such that they rotate under the action of the yaw system. A control system is coupled to the one or more detectors and is arranged to compare the detected wind velocity component with a wind velocity value and control the yaw system in response to the comparison. The nacelle can be rotated under control of the control system until the yaw error is substantially zero.

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1. A wind turbine, comprising: a rotor comprising one or more rotor blades and a hub, the hub being attached to a nacelle;a yaw system for rotating the nacelle;a first detector for detecting a component of wind velocity along a line of sight, wherein the line of sight of the first detector does not

1. A wind turbine, comprising: a rotor comprising one or more rotor blades and a hub, the hub being attached to a nacelle;a yaw system for rotating the nacelle;a first detector for detecting a component of wind velocity along a line of sight, wherein the line of sight of the first detector does not pass through an area swept out by the one or more rotor blades during rotation of the one or more rotor blades, the first detector being mounted to rotate in response to an action of the yaw system; anda control system coupled to the first detector and arranged to compare the detected component of wind velocity with a wind velocity value and to control the yaw system in response to the comparison. 2. The wind turbine of claim 1, further comprising a second detector, coupled to the control system, for detecting a component of wind velocity along a line of sight, the second detector being mounted to rotate in response to the action of the yaw system; wherein the wind velocity value with which the detected component of wind velocity from the first detector is compared is a component of wind velocity detected by the second detector. 3. The wind turbine of claim 2, wherein the first detector and the second detector are arranged such that when a magnitude of the component of wind velocity detected by the first detector is substantially equal to a magnitude of the component of wind velocity detected by the second detector then the yaw system is correctly aligned; and the control system is arranged to compare the component of wind velocity detected by the first detector with that of the second detector and to control the yaw system to cause their magnitudes to be substantially equal. 4. The wind turbine of claim 2, wherein the first detector and the second detector are arranged such that the line of sight of the first detector points in substantially an opposite direction to the line of sight of the second detector. 5. The wind turbine of claim 2, wherein the first detector and the second detector are arranged such that an angle formed between the line of sight of the first detector and an axis of rotation of the rotor is substantially equal and opposite to the angle formed between the line of sight of the second detector and the axis of rotation of the rotor. 6. The wind turbine of claim 1, wherein the first detector is arranged such that the line of sight is substantially perpendicular to an axis of rotation of the rotor. 7. The wind turbine of claim 1, wherein the first detector is arranged such that the line of sight is substantially perpendicular to an expected airflow around the rotor when the yaw system is correctly aligned. 8. The wind turbine of claim 7, further comprising a second detector having a line of sight in a different direction to the first detector, wherein the second detector is arranged such that the line of sight of the second detector is substantially perpendicular to the expected airflow around the rotor. 9. The wind turbine of claim 1, wherein the control system is arranged to control the yaw system to make the detected component of wind velocity and the wind velocity value, or their magnitudes, substantially equal. 10. The wind turbine of claim 1, wherein the control system is arranged to control the yaw system to rotate the nacelle until a predetermined wind velocity is measured by the first detector. 11. The wind turbine of claim 10, wherein the predetermined wind velocity is one or more of: a minimum velocity and substantially zero. 12. The wind turbine of claim 1, wherein the first detector comprises at least one of: a Doppler anemometer, a LIDAR detector, a SODAR detector, a RADAR detector, and a LDV detector. 13. The wind turbine of claim 2, wherein the first detector is arranged to detect a wind velocity component at a distance from the second detector, the distance being greater than or equal to a length of the one or more rotor blades. 14. The wind turbine of claim 13, wherein the distance is between 1 and 2 times the rotor blade length, and preferably between 1.2 and 2 times the length of the one or more rotor blades. 15. The wind turbine of claim 1, wherein the first detector is arranged to detect wind velocity components at the plurality of distances along the line of sight of the first detector. 16. The wind turbine of claim 1, wherein the control system is further arranged to receive an output from a wind speed detection device, and the control system being arranged to also control the yaw system in response to the output including a wind speed. 17. The wind turbine of claim 1, wherein the first detector is arranged such that when a yaw error is substantially zero the line of sight of the first detector is pointing substantially perpendicular to an expected airflow around the rotor. 18. The wind turbine of claim 1, wherein the first detector is mounted on the nacelle. 19. The wind turbine of claim 1, wherein the first detector is additionally mounted on rotating means, allowing the first detector to rotate relative to the nacelle, and the component of the wind velocity detected by the first detector is provided to the control system to determine a wind velocity profile and to control the yaw system in response to the wind velocity profile. 20. A method of controlling a wind turbine, the wind turbine having a rotor comprising one or more rotor blades and a hub, the hub being attached to a nacelle; a yaw system for rotating the nacelle; a first detector for detecting a component of wind velocity along a line of sight of the first detector, the first detector being mounted to rotate in response to an action of the yaw system, and a control system coupled to the first detector, the method comprising at a controller of the control system: receiving a value from the first detector indicating the component of wind velocity along the line of sight of the first detector, wherein the line of sight of the first detector does not pass through an area swept out by the one or more rotor blades during rotation of the one or more rotor blades;comparing the wind velocity component with a wind velocity value to determine if the rotor is correctly aligned with a wind direction; andsending a control signal to the yaw system, in response to the comparison, to rotate the nacelle if the rotor is not correctly aligned with a wind direction. 21. The method of claim 20, wherein the wind turbine further comprises a second detector, coupled to the control system, for detecting a component of wind velocity along a line of sight of the second detector, the second detector being mounted to rotate in response to the action of the yaw system; wherein the wind velocity value with which the detected component of wind velocity from the first detector is compared is the component of wind velocity detected by the second detector. 22. The method of claim 21, wherein the first detector and the second detector are arranged such that when a first magnitude of the component of wind velocity detected by the first detector is substantially equal to a second magnitude of the component of wind velocity detected by the second detector then the yaw system is correctly aligned; the method further comprising: comparing, at the control system, the component of wind velocity detected by the first detector with that of the second detector and sending a control signal to the yaw system to cause the nacelle to rotate unless the first magnitude and the second magnitude are substantially equal. 23. The method of claim 20, implemented in a wind turbine. 24. The method of claim 20, further comprising sending control signals to control the yaw system to yaw the wind turbine when the detected component of wind velocity and the wind velocity value, or their magnitudes, are not substantially equal. 25. The method of claim 20, further comprising sending a control signal to control the yaw system to rotate the nacelle until a predetermined wind velocity is measured by the detector. 26. The method of claim 25, wherein the predetermined wind velocity is a minimum velocity and preferably substantially zero. 27. The method of claim 20, further comprising detecting, using the first detector, wind velocity components at a distance from the first detector, the distance being greater than or equal to a length of the one or more rotor blades. 28. The method of claim 27, wherein the distance is between 1 and 2 times the length, and preferably between 1.2 and 2 times the length. 29. The method of claim 20, further comprising detecting, using the first detector, wind velocity components at a plurality of distances from the first detector, along the line of sight of the first detector. 30. The method of claim 20, wherein the first detector is additionally mounted on rotating means, allowing the first detector to rotate relative to the nacelle, the method further comprising: rotating the first detector relative to the nacelle and detecting a plurality of wind velocity components;providing the detected wind velocity components to the control system to determine a wind velocity profile; andsending control signals to the yaw system to control a turbine yaw in response to the wind velocity profile. 31. The method of claim 20, wherein the determining whether the rotor is correctly aligned with the wind direction further comprises comparing the detected component of wind velocity with a predetermined wind velocity value, and wherein a control signal is sent to the yaw system to rotate the nacelle if the detected component of wind velocity is higher than the predetermined wind velocity value. 32. The method of claim 31, wherein the determining whether the rotor is correctly aligned with the wind direction comprises determining a yaw error based on the received value. 33. A control system for controlling an operation of a wind turbine, the wind turbine comprising: a rotor comprising one or more rotor blades and a hub, the hub being attached to a nacelle; and a yaw system for rotating the nacelle; the control system comprising:a first detector for detecting a component of wind velocity along a line of sight of the first detector, wherein the line of sight of the first detector does not pass through an area swept out by the one or more rotor blades during rotation of the one or more rotor blades, the first detector being mounted to rotate in response to an action of the yaw system; anda controller coupled to the first detector for providing an output control signal for the wind turbine, wherein the controller is arranged to:receive values from the first detector indicating a component of wind velocity along the line of sight of the first detector;compare the component of wind velocity with a wind velocity value; andsend a control signal to the yaw system, in response to the comparison, to rotate the nacelle if the rotor is not aligned with a wind direction. 34. The control system of claim 33, further comprising a second detector, coupled to the controller, for detecting a component of wind velocity along a line of sight of the second detector, the second detector being mounted to rotate in response to the action of the yaw system; wherein the wind velocity value with which the detected component of the wind velocity along the line of sight of the first detector is compared is the detected component of the wind velocity along the line of sight of the second detector. 35. The control system of claim 34, wherein the first detector and the second detector are arranged such that when a first magnitude of the component of wind velocity detected by the first detector is substantially equal to a second magnitude of the component of wind velocity detected by the second detector the yaw system is correctly aligned; and the controller is arranged to compare the component of wind velocity detected by the first detector with that of the second detector and to control the yaw system to cause the first magnitude and the second magnitude to be substantially equal. 36. The control system of claim 34, wherein the first detector and the second detector are arranged such that the line of sight of the first detector points in substantially an opposite direction relative to the line of sight of the second detector. 37. The control system of claim 34, wherein the first detector and the second detector are arranged such that an angle formed between the line of sight of the first detector and an axis of rotation of the rotor is substantially equal and opposite to an angle formed between the line of sight of the second detector and the axis of rotation of the rotor. 38. The control system of claim 34, wherein the second detector is arranged such that the line of sight of the second detector does not pass through the area swept out by the one or more rotor blades during rotation of the one or more rotor blades. 39. The control system of claim 34, wherein the first detector and the second detector are arranged such that their lines of sight are substantially perpendicular to an axis of rotation of the rotor. 40. The control system of claim 34, wherein the first detector and the second detector are arranged such that their lines of sight are substantially perpendicular to an expected airflow around the rotor when the yaw system is correctly aligned. 41. A computer program product containing computer code arranged to control the wind turbine of claim 1.