US 12,264,650 B2
Method for controlling an offshore floating tower wind turbine, and control system and wind turbine that use the method
Jose Salustiano Serna Garcia-Conde, Madrid (ES); and David Sarrasin Gomez, Madrid (ES)
Assigned to ESTEYCO S.A., Madrid (ES)
Appl. No. 17/642,496
Filed by ESTEYCO S.A., Madrid (ES)
PCT Filed Sep. 15, 2020, PCT No. PCT/ES2020/070551
§ 371(c)(1), (2) Date Mar. 11, 2022,
PCT Pub. No. WO2021/053252, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. ES201930802 (ES), filed on Sep. 16, 2019.
Prior Publication US 2022/0325695 A1, Oct. 13, 2022
Int. Cl. F03D 7/02 (2006.01); F03D 7/04 (2006.01); F03D 13/25 (2016.01)
CPC F03D 7/0224 (2013.01) [F03D 7/04 (2013.01); F03D 13/25 (2016.05); F05B 2240/93 (2013.01); F05B 2240/95 (2013.01); F05B 2270/1033 (2013.01); F05B 2270/32 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A control method for controlling an offshore tower wind turbine, wherein said wind turbine comprises a rotor with a plurality of blades and a plurality of actuators, said control method comprising:
a. producing a power P with the wind turbine, that is variable over time and dependent on a relative wind speed Vw at which a wind strikes the rotor, where Prated is a rated power of the wind turbine that may be achieved when the relative wind speed Vw is equal to or greater than a rated wind speed Vr;
b. regulating a pitch angle A of the plurality of blades with the plurality of actuators, such that:
i. given the relative wind speed Vw, an increase in the pitch angle A of the plurality of blades entails a decrease in a rotation speed of the rotor and/or of the produced power P and/or of a thrust that the wind exerts on the rotor;
ii. given the relative wind speed Vw, a decrease in the pitch angle A of the plurality of blades entails an increase in the rotation speed of the rotor and/or of the produced power P and/or of the thrust that the wind exerts on the rotor;
iii. the pitch angle A of the plurality of blades has a minimum value which is assigned, by convention, a 0-degree pitch value for the plurality of blades;
iv. given the relative wind speed Vw greater than Vr, there is a theoretical pitch angle of the plurality of blades At greater than 0 degrees, such that the produced power P is substantially equal to Prated;
c. experiencing, in at least one working condition, movements that generate a speed of the wind turbine Va, which is understood as being positive (Va>0) when the wind turbine is displaced in a direction substantially contrary to the direction of the wind and is understood as being negative (Va<0) when the wind turbine is displaced in a direction coinciding substantially with the direction of the wind;
d. monitoring the speed of the wind turbine Va directly or indirectly with sensors;
establishing at least during part of the time for which the speed of the wind turbine Va is positive (Va>0) and the relative wind speed Vw is greater than Vr (Vw>Vr), a pitch angle A of the plurality of blades less than At (A<At), wherein the wind turbine produces a power P greater than Prated (P>Prated); and/or
establishing at least during part of the time for which the speed of the wind turbine Va is negative (Va<0) and the relative wind speed Vw is greater than Vr (Vw>Vr), a pitch angle A of the plurality of blades greater than At (A>At), wherein the wind turbine produces a power P less than Prated (P<Prated).