Combined use of PCA and Prony Analysis for Electromechanical Oscillation Identification

In this study, a new PMU-based method of identification of electromechanical oscillations is presented exploiting Principal Components Analysis (PCA). The proposed method makes it possible to carry out analysis on a limited number of the so-called Princial Components (PCs), obtaining information on the behavior of voltages and currents at buses following a small perturbation. The analysis is completed using the Prony analysis on the PCs, which is able to determine the amplitude, frequency and damping of a mode. To assess the effectiveness of the method, the algorithm has been applied on a test system based on the Kundur Two-area system as well as on a real event.