20.3.1.1 Synchrophasors for Oscillatory StabilitySynchrophasors can be used for oscillatory stability detection designed to detect slower inter-area system oscillations. These are characterised by power oscillations between two areas of generation, running at slightly different speeds and following small system perturbations such as load switching or tap changes. If there is insufficient system damping, these oscillations do not die away and can escalate leading to potential out-of-step conditions if no pre-emptive action is taken. If the phasor measurement units feature frequency tracking that can accurately measure and track small changes in signal frequencies, this can provide an accurate measurement for the fast detection of small signal oscillations to initiate damping actions.
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