US 12,341,341 B2
Frequency support from a power plant with an electrical storage unit
Mads Rajczyk Skjelmose, Risskov (DK); Kouroush Nayebi, Ikast (DK); and Henrik Møller, Egå (DK)
Assigned to VESTAS WIND SYSTEM A/S, Aarhus N (DK)
Appl. No. 17/638,718
Filed by VESTAS WIND SYSTEMS A/S, Aarhus (DK)
PCT Filed Aug. 20, 2020, PCT No. PCT/DK2020/050237
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2021/037320, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. PA 2019 70547 (DK), filed on Aug. 30, 2019.
Prior Publication US 2022/0224118 A1, Jul. 14, 2022
Int. Cl. H01M 10/44 (2006.01); H02J 3/00 (2006.01); H02J 3/24 (2006.01); H02J 3/32 (2006.01); H02J 7/00 (2006.01); H02J 7/04 (2006.01)
CPC H02J 3/241 (2020.01) [H02J 3/003 (2020.01); H02J 3/004 (2020.01); H02J 3/32 (2013.01); H02J 7/0048 (2020.01); H02J 7/0071 (2020.01); H02J 7/04 (2013.01); H02J 2300/28 (2020.01); H02J 2300/40 (2020.01)] 10 Claims
OG exemplary drawing
 
1. A method for controlling a power plant for providing frequency support to a power grid, the power plant comprises an electrical storage unit and a power generating system comprising one or more power generating units including at least one wind turbine generator, where the power generating system is connected to an electrical power grid for supplying power to the electrical power grid, and wherein the electrical storage unit is electrically connected with the power generating system and is controllable to charge or discharge dependent on a power set-point, wherein the method comprises:
setting a frequency control period, wherein the electrical storage unit is scheduled to charge or discharge according to a first power set-point;
at a start of the frequency control period, charging or discharging the electrical storage unit according to the first power set-point;
in case a frequency of the power grid exceeds a first grid frequency located above or below a frequency threshold, resulting in a first frequency deviation within the frequency control period, determining a first power change of the power from the electrical storage unit based on the first frequency deviation;
determining a second power set-point based on the determined first power change;
providing the frequency support by controlling the electrical storage unit to charge or discharge according to the second power set-point;
in case the frequency of the power grid exceeds a second grid frequency located above or below the first grid frequency, resulting in a second frequency deviation within the frequency control period:
determining a second power change;
determining a third power set-point based on the second power change; and
providing the frequency support by controlling the electrical storage unit to reverse charging to discharging the electric storage unit, or vice versa, according to the third power set-point.