Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 632897, 16 pages
Research Article

Closed-Loop Identification of Power System Based on Ambient Data

1College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
2Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Received 28 November 2011; Accepted 14 February 2012

Academic Editor: Alexander P. Seyranian

Copyright © 2012 Chao Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Small fluctuations caused by random changes of loads exist continuously in power grids, which are called ambient signals. Using time-synchronized phasor measurements, the closed-loop identification of power system based on ambient data is discussed, which can reflect accurate operating conditions currently and provide critical information for system analyzing and controller designing. The closed-loop identification of a power system with multiple disturbances is theoretically studied, including the closed-loop identifiability, the consistency properties, and the convergence properties. The requirements for realizing the closed-loop identification are summarized, and the theoretical research results are validated by simulation examples.