Real-Time Transient Stability Prediction - Possibilities for On-Line Automatic Database Generation and Classifier Training

Abstract

This paper has two parts. In Section 1, we review aspects of transient stability analysis and control with emphasis on how to exploit computation capability for improved off-line, on-line, and real-time decision making. We also survey advanced transient stability controls. As an example of a complex instability that is challenging to control, we describe the December 14, 1994 breakup of the western North America interconnection.In Section 2, we propose real-time, wide-area, discontinuous transient stability control using decision trees computed on-line as operating conditions change. Input to decisions trees are predictor indices measured during a short window following a severe disturbance. Measurements and computations for these variables, mostly taken or computed at generating plants, can include synchronized voltage angles, relative rotor angle estimates, generator relative speed estimates, electrical positive sequence power as proxy for accelerating power, accelerating energy, etc. Discontinuous control can include generator tripping, fast HVDC power changs series or shunt capacitor insertion, and dynamic braking. The study system is a relatively small (176 bus) equivalent of the western North American synchronous interconneetion.