ONLINE DYNAMIC-SECURITY CONTINGENCY SCREENING AND RANKING

An on-line dynamic-security contingency screening and ranking system f or large complex power systems, online algorithms for system-instabili ty studies (OASIS), has been developed which is intended to provide a list of ranked contingencies for the current operational state of the power system every lj min. A highspeed power-system simulator is used to predict, in real time transient and dynamic stability from any init ial power-system state together with an appropriate contingency list, OASIS uses a client/server model and is designed to run on a heterogen eous computer network to avoid any limit to system size. The prototype of the assessor was completed in mid 1994 and field trials were carri ed out within an operational power-system-control centre using real on line data taken from the system energy-management system. Implementati on of OASIS and the results of the field trials are described.