Two-Level Ambient Oscillation Modal Estimation From Synchrophasor Measurements

TitleTwo-Level Ambient Oscillation Modal Estimation From Synchrophasor Measurements
Publication TypeJournal Article
Year of Publication2014
AuthorsJiawei Ning, S. Arash Nezam Sarmadi, Vaithianathan Venkatasubramanian
JournalIEEE Transactions on Power Systems
Pagination1 - 10
Date Published12/2014
KeywordsAA13-004, AARD, CERTS, oscillations, phasor measurement units (PMUs)

This paper proposes a decentralized two-level structure for real-time modal estimation of large power systems using ambient synchrophasor data. It introduces two distributed algorithms that fit the structure well, namely, 1) decentralized frequency domain decomposition and 2) decentralized recursive stochastic subspace identification. As opposed to present-day oscillation monitoring methodologies, the bulk of the algorithmic computations is done locally at the substation level in the two-level framework. Substation modal estimates are sent to the control center where they are grouped, analyzed, and combined to extract system modal properties of local and inter-area modes. The framework and the proposed algorithms provide a scalable methodology for handling oscillation monitoring from a large number of substations efficiently. The two-level structure and the two decentralized algorithms are tested using simulated data from standard test systems and from archived real power system synchrophasor data.

Short TitleIEEE Trans. Power Syst.