Multi-swing transient instability problems in electric power systems: a preliminary study

Multi-swing trajectories, which refer to those trajectories which oscillate several cycles and then become unbounded, has been a nuisance in power system engineering for a long time, In order to characterize such irregular behaviors, we develop two different mechanisms to explain the existence of such multi-swing behaviors. Theoretical analysis has strongly indicated a close relationship between multiswing instability problems and chaotic motions of the corresponding power systems