ANGLE STABILITY PREDICTIONS

Abstract

The variance of phase angle changes over the network is a good display of total stress and angle stability. The integral square generator angle (ISGA) changes had been recommended earlier to evaluate how severe the stable and unstable transient contingencies in simulation are. This project offers its addition to bus voltage angles (ISBA) which could be measured with synchronized phasor measurement units (PMUs) over a wide-ranging area. By restructuring continuous paths that go outside the boundary be-tween positive and negative 180 degrees before calculating the ISBA, the cutoff of bus angles at positive and negative 180 degrees is recovered. The project also directs the matter of obtaining the best angle stability index as the threshold between stable and unstable classes with use of simulation da-ta. This issue becomes more difficult by the fact that large databases might include a few events for which loss of synchronism happens toward the end of the simulation sequence.