External network modeling for optimal power flow applications

Traditional external network modeling techniques have been widely used in the power industry to produce equivalent models that are suitable for power flow analysis and security assessment applications. These techniques cannot be used to produce models for optimal power flow applications. In this paper, we present a new methodology that is suitable for security analysis and security control. The proposed method has been tested extensively under a wide variety of operating conditions using data from a large scale system. The results strongly indicate that the proposed method outperforms the extended Ward method in producing equivalent models for security control and does not create an additional burden in maintaining and updating the EMS database