Stability criteria for trajectory simulation in transient stability assessment

In this paper, novel and efficient stopping criteria for power system post-fault trajectory simulation are proposed for expediting the speed of transient stability assessment (TSA). Based on the criteria, an algorithm is developed to determine the critical clearing time (CCT) for a multimachine power system. The algorithm combines the merits of both the fast speed of the technique of potential energy boundary surface (PEBS) and the reliability of the time domain simulation method. Examples are given to show the problems of integration stopping criteria published in recent papers and how they are overcome in this paper. Extensive tests were done on several systems and the results show that the proposed criteria are reliable and the algorithm improved the efficiency of traditional time domain numerical simulation methods.<>