FAST TRANSIENT SECURITY ASSESSMENT.

The growth of large interconnected power systems demands a high degree of security for normal operation. This requirement emerges from the fact that the possible disturbances in large power systems could have catastrophic results. Therefore it is the duty of power system control center to retain the operating point within secure boundaries. In order to control the security of system, one has to monitor and analyze the level of system security and enhance it in case it does not fulfill the system security requirement. The pattern recognition technique proposed is a method suitable for fast, on-line security assessment. Most of the literature in this area concerns the use of steady state variables for identification purposes. The use of transient measurements, however, has been found to be better suited for the fast classification of operating points with minimal error.