POWER SYSTEM DETECTION OF SUSTAINED OSCILLATIONS BASED ON SYNCHROPHASOR FREQUENCY MEASUREMENTS

A method includes performing by a processor: receiving a plurality of power system phase angle measurements over a time interval from a plurality of phasor measurement units (PMUs) in a power system, generating a phase angle curve over the time interval based on the plurality of power system phase angle measurements, and detecting a sustained oscillation event in a power signal generated by the power system based on an envelope of the phase angle curve.