Application of PTP synchronized PMUs in power system small-signal stability analysis

Author(s): Louwrance J. Ngoma*, Thokozile F. Mazibuko, Josiah L. Munda, Aloys O. Akumu
Tshwane University of Technology, Department of Electrical Engineering, Pretoria, 0001, South Africa
International Journal of Smart Grid and Clean Energy, vol. 3, no. 3, July 2014: pp. 325-333
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.3.3.325-333

Abstract: Small-signal stability problem is one of the major threats to the power system network security and reliability. Accurate and timely information about the oscillation modes can help optimize stability margin settings, as well as give early warnings for unstable modes to operate a power system at its full capacity while staying within the stability boundaries. This paper considers the possibility of using a software-only Precision Time Protocol (PTP) to synchronize a number of PMUs and how these synchronization uncertainties impact the monitoring of low-frequency oscillations. In the proposed scheme Prony analysis is realized to estimate signals damping information. The proposed scheme is applied on a two-area power system. Simulation results point to the success of the proposed scheme in monitoring of low-frequency oscillations.

Keywords: Phasor Measurement Unit, low-frequency oscillations, Precision Time Protocol, State Estimation, Prony analysis

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