Abstract:
Power system stability is the term applied to alter-nating-current electric power systems, denoting a condition in which the various synchronous machines of the system remain in synchronism or "in step" with each other. There has been continuous development of better techniques for assessing transient stability studies. Further the continuous need, for the development of additional transient stability indices which completely. ` : reflect all the factors that influence the system stability has been felt. There is bulk of literature. available in this area using deterministic approaches. Th:, transient stability is usually determined by using determinis-tic approaches with some predetermined perturbations. But these approaches are not the appropriate solution for the transient stability study, because these only concern with non-probabilistic variables. ..
Transient stability evaluation consider.. the effects of disturbances such as fault, loss of load, sudden switching of transmission line etc. on the system. At present the probabilistic techniques are being used extensively in othei. areas of system planning. The application of probabilistic approach in the analysis of transient stability is a realistic, logical and useful extension of the power system stability study.
