US 12,261,439 B1
Method for damping power oscillation in an electric power grid
Lennart Petersen, Skødstrup (DK); and Torsten Lund, Fredericia (DK)
Assigned to VESTAS WIND SYSTEMS A/S, Aarhus N (DK)
Filed by VESTAS WIND SYSTEMS A/S, Aarhus (DK)
Filed on Aug. 7, 2024, as Appl. No. 18/797,430.
Claims priority of application No. 2023 30391 (DK), filed on Dec. 11, 2023.
Int. Cl. H02J 3/24 (2006.01); H02J 3/38 (2006.01)
CPC H02J 3/241 (2020.01) [H02J 3/381 (2013.01); H02J 2300/28 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A method for damping power oscillation in an electric power grid, wherein the method comprises:
performing a procedure for determination of a phase shift between a filtered voltage signal and a filtered frequency signal, wherein the filtered voltage signal and the filtered frequency signal are associated with oscillation signals associated with the electric power grid and measured at a point of interest;
based on the performed procedure, determining which one of the filtered voltage signal and filtered frequency signal is leading or lagging in relation to the other one of the filtered voltage signal and filtered frequency signal;
based on the determination of which one of the filtered voltage signal and filtered frequency signal is leading or lagging in relation to the other one of the filtered voltage signal and filtered frequency signal, setting a gain of a power oscillation damping controller to be positive or negative, wherein the power oscillation damping controller is configured to receive an input and output an output;
applying the power oscillation damping controller with the set gain so as to produce an output signal outputted from the power oscillation damping controller; and
based on the produced output signal, controlling an injection of electric power to the electric power grid so as to dampen power oscillation in the electric power grid.