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

Claim 14:
15. A method for controlling an inverter-based generator to damp power system oscillations, wherein the inverter-based generator is in a plant that is connected to a grid at a point of intersection (POI), the method comprising:
at a plant controller configured with the inverter-based generator, generating an auxiliary signal, wherein the auxiliary signal is generated from one or more grid signals having a characteristic indicative of a power system oscillation;
at the plant controller, using the auxiliary signal to modify a reactive power command going to a local controller configured with the inverter-based generator 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 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.