Coherency based dynamic equivalencing of electric power system

Electric power networks, all over the world, have been constantly increasing in size and complexity due to several interconnections and high load demand. Power system studies of such large networks require excessive time and storage. In this paper, coherency based dynamic equivalencing technique for reducing the size of the power system network is proposed and implemented in PSS/E (Power System Simulator for Engineers) software to get the dynamic equivalent of a network having high voltage direct current transmission link. A comparison of various softwares available for static network reduction has been carried out. Transient stability simulation of the original and reduced network is performed and compared by creating a three-phase fault. The results are also implemented in Real-Time Digital Simulator (RTDS) to study the performance of equivalent network.