PRACTICAL EXPERIENCE WITH CORRECTIVE SWITCHING ALGORITHM FOR ONLINE APPLICATIONS

The objective of the corrective switching algorithm (GSA) is to identi fy switching candidates to eliminate or reduce system overloads. This paper describes the implementation of the CSA for on-line contingency analysis. The developed program searches for the best switching candid ates from a user specified list, which normally includes all branches in the study area and most typical switching operations (openings and closings) at main substations. The developed algorithm has the unique ability to process complicated substation bus-bar switching scenarios, including multiple switching scenarios per any substation. The select ion algorithm is based on a linearized DC model, but all selected cand idates are verified using AC load flows. The program has been used as part of the security analysis program at Public Service Electric and G as Company (PSE&G) since Summer 1994 and has proved its reliability an d efficiency.