Patent ID: 11894681
Assignee: GENERAL ELECTRIC COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 21:
22. A method for damping power system oscillations in a power system network having one or more local inverter-based generators within a plant, the plant connected to a grid at a point of intersection (POI), the method comprising:
at a plant-level controller, receiving one or more grid signals having a characteristic indicative of a power system oscillation;
at the plant-level controller, generating an auxiliary signal from the grid signals;
transmitting the auxiliary signal to a local controller of one or more of the inverter-based generators;
at the local controller, using the auxiliary signal to modulate reactive power output from the inverter-based generators to improve damping of the power system oscillations;
wherein the generating of the auxiliary signal at, the plant-level controller further comprises the plant level controller receiving capability limits at operating conditions of each of the inverter-based generators and adjusting the auxiliary signal to limit a change in reactive power (ΔQ) utilized for damping, wherein the limit is calculated and implemented at the plant level or at each of the inverter-based generators as a percentage of the reactive power capability of the plant or inverter-based generators; and
further comprising utilizing a switchable washout filter having at least two washout filters with different time constants upstream of a (ΔQ) limiter, wherein when the (ΔQ) limit is reached, output from the switchable washout filter is changed to the washout filter having a lower time constant.