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 represent the rest of the system by a simplified equivalent model. A new and more comprehensive approach to the equivalence problem is presented which emphasize the design and operational aspect rather than conventional network reduction, and which is based on meeting application specified operational requirements. Result from a test case demonstrate the validity and accuracy of the method as applied to outage analysis load flow studies.
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