The authors have developed a new type of program for the numerical simulation of dynamic phenomena in power systems.This program unifies the conventional fields of transient, mid-term and long-term stabilities.The integration algorithm ensures a constant level of accuracy in the calculation of fast o r slow transients through a continually variable step and through suitable numerical stability properties.The performance levels reached, both as regards ease of utilisation and the size and complexity of the simulated systems, allow the majority of cases to be covered so far as the dynamic system behaviour study requirements of the Belgian power companies are concerned. * System black start simulation.* Centralized control design. 0885-8950/89/0200-0129$01 .00@ 1989 IEEE * All long-term stability problems (load shedding schemes, ... ) .* All mid-term stability problems, with simulation of large transients until full return to steady state conditions, with representation of overload protection, emergency shutdown devices and so on, particularly those equipping nuclear power units.* The user requirement of entering his own process and control system models and of disposing of convenient means for checking out these models.
*The replacement and unification of all the transient and long-term stability programs used by the power utilities in Belgium, as well as the mathematical process and regulation models, in Order to maximize model building profitability and to facilitate the exchange of results between specialists.
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