Issues on security region search by online DSA

In real-time operations, online DSA applications can be used not only to perform security assessment for the current operating point but also to search boundaries of security region for operations staff to prepare for the next step generation dispatch and calculate transfer limits for market operations. This paper analyses the issues that were encountered when dealing with future re-configurations of power system resources in security region search., which include: (a) The approach to incorporate the Remedial Action Schemes (RAS) into the security region search in case where RAS are used to enhance power system security; (b) The types of power system resources (in particular, generation and load in various areas and regions) that should be utilized in re-configurations for security region search based on the sink-source concept; (c) The method to determine the levels of participation of the selected resources in order to form reasonable and realistic paths from the current operating point to the potential boundary of the security region.