Dynamic security contingency ranking and generation reallocation using time domain simulation based severity indices

Fast contingency screening and efficient preventive control are two of the necessary integral functions of dynamic security analysis (DSA). Contingency screening requires the use of severity indices, and for DSA such an index should be a measure of system stability. In this paper, three time-domain simulation based indices are proposed for ranking of contingencies and generation rescheduling in DSA. These indices are energy margin index (EMI) based on hybrid extended equal area criteria (EEAC), transient energy index (TEI) based on hybrid transient energy function (TEF), and critical clearing time (CCT). Results on realistic power systems are presented to show their relative merit for use in contingency screening and generation rescheduling.