Application of Wide-area Collocated Control Technique for Damping Inter-area Oscillations Using Flexible AC Transmission Systems Devices

Abstract A wide-area collocated control scheme for damping inter-area oscillations employing multiple flexible AC transmission systems devices is presented. At first, the most effective stabilizing signals are selected by participation factors of a control matrix. Also, these signals are coordinated in a wide-area damping controller to achieve multi-objective collocated control. Then, a systematic procedure for selecting the feedback gain of control design is suggested. A 16-machine, 68-bus study system with a static var compensator, a thyristor controllable series capacitor, and a thyristor controllable phase-shifting transformer at different locations is considered. The damping performance of the controllers is examined in the frequency and time domains for various operating scenarios. The simulation results also show that the collocated control scheme is able to effectively damp out inter-area oscillations following possible disturbances without any prior knowledge about the specific post-disturbance dynamics. The robustness with respect to uncertainty of system models, variations of time delays, and the loss of communication links is evaluated.

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