International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2570

Full Length Research Paper

Online inter-area oscillation monitoring in power systems using PMU data and Prony analysis

B. Mohammadi*, A. Rabiei, M. Moradi-Dalvand and S. Mobayen      
Department of Engineering, Abhar Branch, Islamic Azad University, Abhar, Iran.  
Email: [email protected]

  •  Accepted: 05 August 2011
  •  Published: 02 October 2011


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.