Abstract

In this paper, signals measured by phasor measurement units (PMUs) are used to monitor power system small signal stability. In the proposed method, proper signals selected based on the modes observability and Prony analysis is employed to extract signal damping information (amplitude and frequency of participated modes) in real-time. The proposed method is simulated using a test signal in ideal and noisy environment. Besides, the method is tested on a two-area four machines power system. Prony analysis results are compared with the results of modal analysis that based on the detailed model of power system. Simulation results imply the effectiveness of the proposed method in online monitoring of inter-area oscillations.

Key words: Inter-area oscillations, phasor measurement unit (PMU), Prony analysis.