US 12,012,932 B2
Method and control system for operating a wind farm
Georg Grosseholz, Hamburg (DE); Sören Schröter, Hamburg (DE); Kai Kruppa, Kiebitzreihe (DE); and Simon De Rijcke, Mechelen (BE)
Assigned to Nordex Energy SE & Co. KG, Hamburg (DE)
Filed by Nordex Energy SE & Co. KG, Hamburg (DE)
Filed on Nov. 11, 2022, as Appl. No. 18/054,763.
Claims priority of application No. 21 211 444 (EP), filed on Nov. 30, 2021.
Prior Publication US 2023/0167802 A1, Jun. 1, 2023
Int. Cl. F03D 7/00 (2006.01); F03D 7/02 (2006.01); F03D 7/04 (2006.01); H02J 3/18 (2006.01); H02J 3/38 (2006.01); H02J 3/50 (2006.01)
CPC F03D 7/0284 (2013.01) [F03D 7/048 (2013.01); F05B 2270/1033 (2013.01); H02J 3/1892 (2013.01); H02J 3/381 (2013.01); H02J 3/50 (2013.01); H02J 2300/28 (2020.01)] 16 Claims
OG exemplary drawing
 
1. A method for operating a wind farm comprising a plurality (N) of wind turbines, which are operated to supply electrical power to a grid in accordance with at least one setpoint value for a power related electrical variable, the method comprising the steps of:
receiving a setpoint for a reactive power (QSP,WF) to be supplied by the wind farm;
determining a value of an available reactive power (Qavail,WF) of each wind turbine;
determining an available reactive power of the wind farm (Qavail,WF) from the sum of the available reactive power of each wind turbine (Qavail,WF:=Σj=1NQavail,WTj);
comparing the available reactive power of the wind farm (Qavail,WF) with the received setpoint for the reactive power (QSP,WF) for the wind farm; and,
wherein, if the available reactive power of the wind farm (Qavail,WF) is smaller than the received setpoint for the reactive power (QSP,WF) for the wind farm:
determining a required increase of the reactive power (ΔQWTj*) for at least one of the wind turbines based at least on the available reactive power of the wind farm (Qavail,WF) and the setpoint for the reactive power for the wind farm (QSP,WF),
wherein the required increase of reactive power (ΔQWTj*) of the at least one wind turbine is determined as a first fraction (gj) of a difference of the setpoint for the reactive power (QSP,WF) for the wind farm and the available reactive power of the wind farm (Qavail,WF):
ΔQWTj*:=gj(QSP,WF−Qavail,WF),
wherein the first fraction (gj) is determined from a sensitivity of the reactive power (Qj) to the active power (Pj), wherein the first fraction (gj) is proportional to the sensitivity;
determining a setpoint for the reactive power (QSP,WTj) for each of the at least one of the wind turbines based at least on the available reactive power of said each wind turbine (Qavail,WTj) and said required increase of the reactive power (ΔQWTj*); and,
distributing at least one of the required increase of the reactive power (ΔQWTj*) and the setpoint for the reactive power (QSP,WTj) to each of the at least one of the wind turbines.