Prediction of transient instability and unplanned islanding using phasor measurements data

in this paper a new algorithm has been proposed to predict unplanned islanding. To predict unplanned islanding, rotor angle and speed time series have been used. Times of fault occurrence and clearance are estimated using monitoring system response based on the variation of phasor measure data. The estimated times of fault occurrence and clearance are used to determine suitable calculation window for uncontrolled islanding prediction. The proposed algorithm is applied to IEEE 39 bus test system. The result shows that the objective function can be used to estimate fault occurring and clearance time to predict unplanned islanding.