Online security analysis based on database method for electrical power system

Online security analysis (OSA) is one of the important functions of dispatching automation for modern power systems. In this paper, a new method of OSA based on a database is presented. The fundamental principal of this method is that a large amount of real time calculation would be substituted by a small amount of processing data which are obtained from the OSA database. This database is established by means of organizing the offline calculation data. The results of finite and reasonable offline calculation are taken as an OSA database. Then the theory of OSA using the database and its algorithm are developed. The application of this method to two practical power systems shows that it is a new way to carry out OSA in large power systems and has a wide spectrum in power system real time applications.<>