Calculations of electromechanical eigenvalues based on instantaneous power waveforms

The paper presents the results of calculations of the eigenvalues (associated with electromechanical phenomena) of the Polish National Power System model on the basis of analysis of the simulated and measured instantaneous power disturbance waveforms of generating units in Łaziska Power Plant. The method for calculations consists in approximation of instantaneous power swing waveforms in particular generating units with use of the waveforms being a superposition of the modal components associated with the searched eigenvalues and their participation factors.