Simplifications for Area Security Analysis: A New Look at Equivalence

Analysis of an area within a large interconnected power system under various system configurations and load conditions is often needed in off-and on-line applications. Equivalence isolates the study area and represents the rest of the system by a simplified equivalent model. A new and more comprehensive approach to the equivalence problem is presented which emphasizes the design and operational aspects rather than conventional network reduction, and which is based on meeting application-specified operational requirements. Results from a test case demonstrate the validity and accuracy of the method as applied to outage analysis load flow studies.