The analysis of oscillatory phenomena is a recurrent practice in several areas of research since many systems have oscillatory behavior when disturbed. In electric power systems, in the small-signal stability analysis, the electromechanical oscillations, which are the result of a temporary imbalance between the mechanical and electrical torque of the machine, are widely studied. To mitigate the negative effects of the presence of oscillations in power systems, monitoring the dynamic behavior of certain variables of the synchronous generator, such as the angular velocity of the rotor, is of great relevance. However, obtaining an accurate measure of the rotor speed of the generator connected to the system is not an easy task. In this context, this work proposes a structure to estimate rotor speed from signals that can be easily measured in the high voltage bus of the substation that the generator in the analysis is connected. The speed signal will be obtained by adjusting the coefficients of the differential equation that describes the dynamic behavior of this variable, the swing equation for this tuning, an optimization method based on the genetic algorithm will be applied, taking into account of the measured signals.
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