A Novel Approach to Transient Stability Using Stochastic Energy Functions Suitable For Power System Risk Assessment

-----------------------------------------------------------ABSTRACT----------------------------------------------------------It is very important to maintain supply reliability under the deregulated environment. The transient stability problem is one of the major concerns in studies of planning and operation of power systems. Although the equalarea criterion method is useful in determining the stability as a transient stability evaluation method, the method is only applicable to a one-machine system connected to an infinite bus or to a two machine system and the time domain simulation is the best available tool for allowing the use of detailed models and for providing reliable results. The main limitations of this approach involve a large computation time. This paper describes a method for estimating a normalized power system transient stability of a power system that is four machines, six bus system and three machines, nine bus systems. The critical clearing time is evaluated using corresponding energy function Therefore, the transient energy function (TEF) is constructed for large power system.