Post-Disturbance Transient Stability Status Prediction Using Synchrophasor Measurements

This paper presents a novel method to early predict the transient stability status of a power system after being subjected to a severe disturbance. The proposed technique is based on rate of change of voltage vs. voltage deviation (ROCOV-ΔV) characteristics of the post-disturbance voltage magnitudes obtained from synchrophasor measurements. Converging and diverging nature of the post-disturbance trajectories on ROCOV-ΔV plane is used to recognize the transient stability status. The proposed technique is computationally simple and fast compared to the rotor angle based transient stability prediction methods. Offline simulations and real-time experimental studies carried out for the IEEE 39-bus test system showed over 99% overall success rate under symmetrical and asymmetrical faults as well as changes in pre-disturbance conditions and network topology changes.