Robust H_∞ Damping Control of Multi-FACTS Devices for Stability Enhancement of Power Systems with Signal's Time Delay

摘要

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.