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Mathematical Problems in Engineering
Volume 2013, Article ID 517608, 11 pages
Research Article

Wide-Area Control for Damping Interarea Oscillations with Event-Triggered Scheme

1Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
2College of Electrical Engineering and New Energy, China Three Gorges University, Yichang, Hubei 443002, China
3College of Mathematics and Computer Science, Hubei University of Arts and Science, Xiangyang, Hubei 441053, China

Received 12 January 2013; Accepted 4 March 2013

Academic Editor: Engang Tian

Copyright © 2013 Yunning Zhang 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.


An event-triggered scheme is adopted and applied to the design of a centralized wide-area damping controller (WAHDC) of interconnected power systems with external disturbance. Firstly, based on the linearized multimachine system model, the centralized WAHDC with event-triggered scheme design problem is described as time-delay feedback control problem. Then by using Lyapunov functional method and Jensen inequality technique, criteria for stability with an norm bound and for design of the feedback controller are derived. The linear matrix inequality (LMI) is employed to solve the feedback gain. Finally, case studies are carried out based on two-area four-machine power system. Simulations indicate that the proposed WAHDC with event-triggered scheme can damp the interarea oscillation effectively when the external disturbance is bounded and significantly reduce the number of measured states released to WAHDC. Relationships between event trigger parameter and dynamic performance, and network utilization, and time delay, and and disturbance rejection level are investigated and results obtained can be used to choose an appropriate event trigger parameter.