SIMULTANEOUS COORDINATED DESIGNING OF UPFC AND PSS OUTPUT FEEDBACK CONTROLLERS USING PSO

Hossein Shayeghi - Saieed Jalilizadeh - Heidarali Shayanfar - Amin Safari

   In this paper, a novel method presents the simultaneous coordinated designing of the UPFC and the power system stabilizer with output feedback controllers in single-machine infinite-bus power system. On the basis of the linearized Phillips-Herffron model, the coordinated design problem of PSS and UPFC with output feedback controllers over a wide range of loading conditions and system configurations is formulated as an optimization problem based on the time domain-based objective function which is solved by a particle swarm optimization algorithm (PSO) which has a strong ability to find the most optimistic results. Only local and available state variables are adopted as the input signals of each output feedback controller for the coordinated design. To ensure the robustness of the proposed simultaneous coordinated tuning, the design process takes into account a wide range of operating conditions and system configurations. The effectiveness of the proposed method is demonstrated through nonlinear time-domain simulation and some performance indices studies under various disturbance conditions of over a wide range of loading conditions. The results of these studies show that the PSO based output feedback controllers for coordinated designing has an excellent capability in damping power system oscillations and enhance greatly the dynamic stability of the power system.

Keywords: simultaneous coordinated designing, UPFC, output feedback, power oscillation damping, PSO

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