US 11,808,249 B2
Reaction to an overspeed event
Thomas Esbensen, Herning (DK)
Assigned to SIEMENS GAMESA RENEWABLE ENERGY A/S
Appl. No. 17/275,215
Filed by Siemens Gamesa Renewable Energy A/S, Brande (DK)
PCT Filed Aug. 23, 2019, PCT No. PCT/EP2019/072572
§ 371(c)(1), (2) Date Mar. 11, 2021,
PCT Pub. No. WO2020/057896, PCT Pub. Date Mar. 26, 2020.
Claims priority of application No. 18194816 (EP), filed on Sep. 17, 2018.
Prior Publication US 2022/0049681 A1, Feb. 17, 2022
Int. Cl. F03D 7/04 (2006.01); F03D 7/02 (2006.01)
CPC F03D 7/045 (2013.01) [F03D 7/028 (2013.01); F03D 7/0224 (2013.01); F03D 7/0264 (2013.01); F03D 7/0276 (2013.01); F05B 2260/821 (2013.01); F05B 2270/1011 (2013.01); F05B 2270/1032 (2013.01); F05B 2270/1033 (2013.01); F05B 2270/327 (2013.01); F05B 2270/328 (2013.01); F05B 2270/331 (2013.01); F05B 2270/335 (2013.01); F05B 2270/404 (2013.01); F05B 2270/8042 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method comprising:
determining a rotational speed of a main rotor of a wind turbine;
identifying a controller overspeed situation when the rotational speed of the main rotor of the wind turbine exceeds a first predefined rotational speed limit but is lower than a second predetermined rotational speed limit; and
continuing to operate the wind turbine and controlling the wind turbine during the controller overspeed situation, wherein controlling includes:
determining a current state related to the wind turbine;
providing data related to the current state as input to a turbine model;
predicting a load of at least one wind turbine component and power output of the wind turbine using the turbine model provided with the input for plural control strategies, wherein the plural control strategies include curtailing the rotational speed of the wind turbine rotor and/or the power output by adjusting at least one blade pitch angle and/or adjusting a generator torque;
comparing the predicted load and power output for the plural control strategies; and
selecting that control strategy among the plural control strategies that satisfies a target criterion comprising the load and the power output;
further wherein when the rotational speed of the main rotor of the wind turbine exceeds the second predetermined rotational speed limit a safety overspeed situation is identified and the wind turbine is shut down.