US 12,129,828 B2
Method for operating a wind turbine, and a power plant
Christoph Schulten, Salzbergen (DE)
Assigned to General Electric Renovables España S.L., Barcelona (ES)
Filed by General Electric Renovables Espana, S.L., Barcelona (ES)
Filed on May 11, 2022, as Appl. No. 17/741,745.
Claims priority of application No. 21173690 (EP), filed on May 12, 2021.
Prior Publication US 2022/0364544 A1, Nov. 17, 2022
Int. Cl. F03D 7/04 (2006.01); F03D 7/02 (2006.01)
CPC F03D 7/042 (2013.01) [F03D 7/0272 (2013.01); F05B 2270/20 (2013.01); F05B 2270/327 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for operating a wind turbine having a rotor with rotor blades and a power conversion system mechanically connected with the rotor that is configured to convert input motive power into electrical output power (P), the power conversion system electrically connected to a network to feed the electrical output power (P) to the network, the method comprising:
at a first time (t0), initializing the wind turbine to operate in an overproduction mode in which the electrical output power (P) of the power conversion system is increased from an initial electrical output power (P0), wherein kinetic energy stored in the rotor is used in the overproduction mode;
at a second time (t2=t0+Tresp), start decreasing the electrical output power (P), and start integrating a reference power (Pref) to determine an energy recovery value (Erec);
determining an energy response value (Eresp) corresponding to a product of the reference power (Pref) with a time difference (Tresp) between the second time (t2) and the first time (t0); and
operating the wind turbine (100) in a recovery operating mode from a third time (t3) at which the electrical output power (P) reaches or crosses the reference power (Pref, P0) until the energy recovery value (Erec) becomes at least equal to the energy response value (Eresp) or until the electrical output power (P) reaches or crosses the reference power (Pref) again from below, wherein the electrical output power (P) is, in the recovery operating mode, limited upwards depending on the reference power (Pref) and a currently available maximum electrical power output (Pmax(t)) without reducing a speed of the rotor.