Title :
A real-time distributed Prony-based algorithm for modal estimation of power system oscillations
Author :
Nabavi, Sheida ; Chakrabortty, Aranya
Author_Institution :
Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA
Abstract :
In this paper, we present a set of distributed algorithms to estimate the oscillatory electro-mechanical eigenvalues of large power system networks using real-time measurements of phase angles and frequencies. We consider the underlying network to exhibit a strong coherency structure resulting in a two-time-scale behavior of the states. Our goal is to develop a distributed strategy by which only the slow eigenvalues, or the inter-area oscillation modes, can be estimated. Assuming a reliable bound for the slow frequencies, we first pass the actual measurements from the full-order network through a bandpass filter, and use the filter outputs as the effective inputs to our distributed estimation routine. We integrate the centralized Prony method for modal extraction with two commonly-used distributed optimization algorithms, namely, distributed subgradient method (DSM), and alternating direction method of multipliers (ADMM), and show how the filtered outputs can be used in each case to asymptotically estimate the slow eigenvalues of interest. We illustrate our results using a IEEE 39-bus power system, and show the robustness of our methods in face of communication failures.
Keywords :
band-pass filters; eigenvalues and eigenfunctions; gradient methods; modal analysis; oscillations; phasor measurement; power systems; alternating direction method of multiplier; band-pass filter; centralized Prony method; communication failure; distributed estimation routine; distributed optimization algorithm; distributed strategy; distributed subgradient method; full order network; interarea oscillation mode; large power system network; modal estimation; modal extraction; oscillatory electro-mechanical eigenvalue; phase angle measurement; power system oscillation; real-time distributed Prony based algorithm; real-time measurement; Eigenvalues and eigenfunctions; Estimation; Frequency measurement; Generators; Oscillators; Phasor measurement units; Power systems; Distributed parameter systems; Large scale systems; Power systems;
Conference_Titel :
American Control Conference (ACC), 2014
Conference_Location :
Portland, OR
Print_ISBN :
978-1-4799-3272-6
DOI :
10.1109/ACC.2014.6859381