\ I umeric simulation of power ed with severe disturbances. A I Y systems over extended periods of time is an important problem of current interest. This interest is motivated by the trend among utilities to increase EXSTAB enables numeric simulation ofpower system phenomena spanning periods program that can automatically adjust the time step of integration, in accordance with the system behavior, provides the best tool for studying both fast power transfers on critical transo f several seconds to several and slow phenomena. mission corridors. This trend hours. involving: Slow events This article illustrates the v can lead to the operation of power systems under conditions for which they were not originalapplication of a new Extended Time Scale Stability Analysis program (EXSTAB), developed as fast transients ly designed, or beyond theirorigfor the numerical simulation of inal design limits, and can create serious performance power system phenomena spanning time periods from problems. Some of these problems develop over periods I several seconds to several hours and involving slow of time much longer than those
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