Calculations of electromechanical eigenvalues based on instantaneous power waveforms at a step disturbance

The paper presents the calculation results of state matrix eigenvalues (associated with electromechanical phenomena) of the power system model based on the analysis of simulated instantaneous power disturbance waveforms of power system generating units at a step disturbance introduced in a voltage regulation system of one of the units. The method for calculations of electromechanical eigenvalues used in investigations consists in the approximation of instantaneous power disturbance waveforms in particular generating units with the waveforms being a superposition of the modal components associated with the searched eigenvalues and their participation factors