Robust H∞ Damping Control of Multi-FACTS Devices for Stability Enhancement of Power Systems with Signal’s Time Delay
Fang Liu*,†, Min Wu**, Danyun Li*, Yong He**, and Ryuichi Yokoyama***
*School of Information Science and Engineering, Central South University
Minzhu Building, Yuelu Mountain, Changsha 410083, China
**School of Automation, China University of Geosciences
388 Lumo Road, Wuhan, Hubei 430074, China
***Graduate School of Environmental and Energy Engineering, Waseda University
3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
In this paper, a robust H∞ damping controller of multi-FACTS device for a power system is developed with considering the time delay of the remote feedback signals transmitted by wide-area measurement systems (WAMS). A free-weighting matrices method based on linear control design approach is presented to design the robust H∞ damping controller to improve the dynamical performance of power systems. Firstly, the linearized reduced-order plant model is established, which efficiently considers the signal’s time delay and disturbance. Then, the design of multi-FACTS robust H∞ damping controller is formulated as the standard control problem on delay-dependent state-feedback robust control based on the robust control theory. Finally, the simulation tests are carried out on the 2-area 4-machine power systems. Satisfactory test results verify the correctness of the proposed damping controller.
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