US 12,078,151 B2
Wind turbine and method of operating a wind turbine
Werner Gerhard Barton, Salzbergen (DE); and Parag Rameshchandra Dharmadhikari, Garching b. München (DE)
Assigned to General Electric Renovables España S.L., Barcelona (ES)
Filed by General Electric Renovables Espana, S.L., Barcelona (ES)
Filed on Nov. 8, 2022, as Appl. No. 17/982,850.
Claims priority of application No. 21207505 (EP), filed on Nov. 10, 2021.
Prior Publication US 2023/0147903 A1, May 11, 2023
Int. Cl. F03D 7/02 (2006.01); F03D 9/25 (2016.01)
CPC F03D 7/0284 (2013.01) [F03D 9/255 (2017.02); F05B 2270/1016 (2013.01); F05B 2270/327 (2013.01); F05B 2270/332 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of operating a wind turbine, wherein the wind turbine includes:
a double-fed induction generator having a generator stator and a generator rotor;
a power conversion assembly including a rotor-side power converter and a line-side power converter;
a load;
the generator rotor electrically coupled to the rotor-side power converter;
the line-side power converter and the load electrically coupled to a grid via a low-voltage winding of a transformer, the low-voltage winding having an upper current limit corresponding to a maximum current rating of the low-voltage winding;
wherein a first sum of a rated current of the generator rotor and a rated current of the load is more than the upper current limit of the low-voltage winding;
the method comprising:
when operating the generator at a sub-synchronous speed, drawing a first current through the low-voltage winding and the power conversion assembly to the generator rotor, the first current being less than a normal generator rotor current setpoint, and
drawing a second current through the low-voltage winding to the load, wherein a second sum of the first current and the second current is equal to or less than the upper current limit of the low-voltage winding.