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Control method for a wind turbine which comprises the steps of obtaining a first signal regarding the azimuthal position for each blade, obtaining at least one signal indicative of wind speed, and calculating a blade pitch angle control term. The step of calculating the blade pitch angle control ter

Control method for a wind turbine which comprises the steps of obtaining a first signal regarding the azimuthal position for each blade, obtaining at least one signal indicative of wind speed, and calculating a blade pitch angle control term. The step of calculating the blade pitch angle control term comprises the use of at least one function dependent on the at least one signal indicative of wind speed and the at least one function dependent on the at least one signal indicative of wind speed includes an increasing piece within a range of wind speed values below a nominal wind speed.

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1. A control method for a wind turbine of the type comprising at least: a tower,a rotor with a plurality of blades, each comprising respective actuators, configured to modify the blade pitch angle of each blade, anda control unit, wherein the method comprises the following steps: obtaining a first s

1. A control method for a wind turbine of the type comprising at least: a tower,a rotor with a plurality of blades, each comprising respective actuators, configured to modify the blade pitch angle of each blade, anda control unit, wherein the method comprises the following steps: obtaining a first signal regarding the azimuthal position for each blade,obtaining at least one signal indicative of wind speed,calculating a blade pitch angle control term for each blade as a function of the azimuthal position of each blade and as a function of at least one signal indicative of wind speed, for the purpose of increasing the blade pitch angle, wherein the step of calculating the blade pitch angle control term comprises the use of the at least one function dependent on the at least one signal indicative of wind speed, and the at least one function dependent on the at least one signal indicative of wind speed includes an increasing piece within a range of wind speed values below a nominal wind speed. 2. The control method of claim 1, wherein the at least one function dependent on the at least one signal indicative of wind speed includes a decreasing piece within a range of wind values above a nominal wind speed. 3. The control method of claim 2, wherein the at least one signal indicative of wind speed comprises a filtered wind measurement. 4. The control method of claim 1, wherein the at least one signal indicative of wind speed comprises a measurement of the generated power. 5. The control method of claim 4, wherein it comprises the steps of: obtaining the measurement of the generated power,establishing a first value of generated power and a second value of generated power, wherein the second value of generated power is lower than the nominal power and the first value of generated power is lower than the second value of generated power,calculating the blade pitch angle control term using the at least one function dependent on the at least one signal indicative of wind speed, using the measurement of generated power as the signal indicative of the wind, and wherein the increasing piece of the at least one function dependent on the at least one signal indicative of wind speed is comprised within the first value of generated power and the second value of generated power. 6. The control method of claim 5, wherein the first value of generated power is 0.65 pu and the second value of generated power is 0.8 pu. 7. The control method of claim 1, wherein the at least one signal indicative of wind speed comprises a measurement of blade pitch angle. 8. The control method of claim 7, wherein it comprises the steps of: obtaining the measurement of the blade pitch angle,establishing a minimum blade pitch angle, a first safety value and a second safety value,calculating the blade pitch angle control term, using the at least one function dependent on the at least one signal indicative of wind speed, using the measurement of the blade pitch angle as the signal indicative of the wind; and wherein the at least one function dependent on the at least one signal indicative of wind speed comprises a decreasing piece within a range of blade pitch angle values, comprised within the minimum blade pitch angle plus the first safety value and the blade minimum pitch angle plus the second safety value. 9. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade as a function of the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed. 10. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function reaches its maximum amplitude when the azimuthal position of the blade is greater than 180°. 11. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function reaches its maximum amplitude when the azimuthal position of the blade is greater than 150° and lower than 170°. 12. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function maintains the amplitude substantially constant and equal to the maximum amplitude as far as an azimuthal position of the blade greater than 180°. 13. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function maintains the amplitude substantially constant and equal to the maximum amplitude as far as an azimuthal position of the blade comprised within 190° and 210°. 14. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function has a null amplitude within a range of azimuthal positions of the blade comprised within 270° and 90°. 15. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function is a trapezoidal function. 16. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and in that the range of azimuthal positions in which the blade pitch angle control term is non-null is dependent on the amplitude calculated using the at least one function dependent on the at least one signal indicative of wind speed. 17. The control method of claim 1, wherein it comprises the steps of: obtaining the measurement of generated powerestablishing a first value of generated power and a second value of generated power, wherein the second value of generated power is lower than the nominal power, and the first value of generated power is lower than the second value of generated power,calculating the blade pitch angle control term, using the at least one function dependent on the at least one signal indicative of wind speed using the measurement of generated power as the signal indicative of the wind and wherein the increasing piece of the at least one function dependent on the at least one signal indicative of wind speed is comprised within the first value of generated power and the second value of generated power, and wherein the step of calculating the blade pitch angle control term, using the at least one function dependent on the at least one signal indicative of wind speed, is performed using the measurement of the blade pitch angle as the signal indicative of the wind when the signal indicative of wind speed is within the range of wind speed values above the nominal wind speed and is performed using the measurement of generated power as the signal indicative of wind speed, when the signal indicative of wind speed is within the range of wind speed values below the nominal wind speed. 18. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function reaches its maximum amplitude when the azimuthal position of the blade is lower than 180°. 19. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade as a function of the azimuthal position of each blade and as a function of the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function reaches its maximum amplitude when the azimuthal position of the blade is greater than 190° and lower than 230°. 20. The control method of claim 1, wherein the step of calculating the blade pitch angle control term for each blade according to the azimuthal position of each blade and to the at least one signal indicative of wind speed comprises the use of a cyclic function, wherein an amplitude of the cyclic function is calculated using the at least one function dependent on the at least one signal indicative of wind speed and the cyclic function is a sine function.