Dynamic Reduction of Large Power System in PSS/E

This paper presents the procedure to establish the dynamic equivalent models of large-scale power systems in the PSS/E program. It consists of identification of coherent generators, aggregation of coherent generators and network reduction. Coherent generators are identified by means of time domain simulation. Aggregation of coherent generators based on the classical model is performed in this paper. Network is reduced through topological reduction. The procedure is illustrated on the East China Power Grid (ECPG) and simulations are performed to verify its accuracy, with fault applied on the equivalent system and the original system respectively. Results of the simulation show that the developed equivalent system has high accuracy in representing the dynamic characteristics of the original system. The developed equivalent model can be used for electromagnetic transient analysis, on-line dynamic security assessment and system control design