OPTIMIZATION BASED CONTROL COORDINATION OF STATCOM AND PSS OUTPUT FEEDBACK DAMPING CONTROLLER USING PSO TECHNIQUE

An optimal procedure for designing coordinated output feedback damping controllers of power system stabilizer (PSS) and STATCOM is developed for achieving and enhancing dynamic stability in single-machine infinite-bus power system. The coordinated design problem of STATCOM and PSS with output feedback controllers over a wide range of loading conditions is formulated as an optimization problem with the time domain-based objective function which is solved by a particle swarm optimization (PSO) algorithm that 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. The effectiveness of the proposed controllers for damping low frequency oscillations are tested and demonstrated through nonlinear time-domain simulation and some performance indices studies. The coordinated design has been demonstrated to provide extremely good damping characteristics