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[References.: 13 tit.]

The stability of electric power systems is one of its most important properties. This article discusses small-disturbance rotor angle stability: aperiodic and oscillatory. The authors consider, typically for stability analysis, the numerical integration methods by modeling in known numerous digital software simulation tools and propose a method for validating of simulation results by benchmark tool instead of field data. The feasibility of the proposed approach is clearly illustrated by the given fragments of the corresponding experimental studies.