PERFORMANCE INDEX AND CLASSIFIER APPROACHES TO REAL-TIME, DISCRETE-EVENT CONTROL

This paper has two parts. Section 1 reviews aspects of transient stabi lity analysis and control with emphasis on how to exploit computation capability for improved off-line, online, and real-time decision makin g. It also surveys advanced transient stability controls, As an exampl e of a complex instability that is challenging to control, it describe s the December 14, 1994 breakup of the western North America interconn ection. Section 2 proposes a form of real-time, wide-area, discontinuo us transient stability control using decision trees computed on-line a s operating conditions change. Input to decision trees are predictor i ndices measured during a short window following a severe disturbance. Measurements and computations for these variables, mostly taken or com puted at generating plants, can include synchronized voltage angles, r elative rotor-angle estimates, generator relative speed estimates, ele ctrical positive sequence power as proxy for accelerating power, accel erating energy, etc. Discontinuous control can include generator tripp ing, fast HVDC power changes, series or shunt capacitor insertion, and dynamic braking. The study system is a relatively small (176-bus) equ ivalent of the western North American synchronous interconnection.