PROBABILISTIC DETERMINATION OF THE MARGIN OF TRANSIENT STABILITY

The sensitivity values of the critical clearing angle and the operatin g angle of a generator connected to an infinite bus through a double-c ircuit transmission line, with respect to the system parameters and op erating variables are evaluated. The limiting values of the parameters and variables within which the system can remain stable are identifie d The sensitivities of the margin of transient stability with respect to the various parameters and variables are also determined. Finally a probabilistic evaluation of the transient stability margin has been c arried out from the deterministic sensitivity values of the transient stability margin. The results show that probabilistic evaluation of th e transient stability margin should be carried out because determinist ic studies give conservative results.