Coherency based Reduction of a Large Power System using PSS/E

This paper presents coherency-based reduction of a large power system network in PSS/E. It consists of methodology of network reduction in PSS/E. Reduction has been done on New England IEEE 39-Bus System. Coherent generators are identified by applying fault and noticing their swing equation. Static reduction has been done by aggregating the coherent generators in PSS/E. For dynamic reduction, generator parameters have been modified manually. Results of static reduction and dynamic reduction have been compared with the exact model. The reduced equivalent model will give a better understanding on a large power system and analysis will be easier.