DESIGN OF DECENTRALIZED CONTROLLERS FOR LARGE POWER-SYSTEMS CONSIDERING SPARSITY

This paper proposes a method for the design of power system controller s aimed at damping out electromechanical oscillations. It can be appli ed to the design of both power system stabilizers (PSSs) for synchrono us generators and supplementary signals associated to other damping so urces. Some attractive features of the method are: the parameters of a ll controllers are jointly determined, there is no restrictions on the type of supplementary signals to be used, and controller structures a re compatible with those nowadays employed in electric utilities. The control problem solution exploits sparsity, combining a system descrip tion which preserves a sparse structure with an adequate mathematical formulation of the optimal design approach. The resulting method is th us made applicable to large power systems. Results for two test system s, including a large 750-bus system, are presented. For both systems, settings for several power system stabilizers are simultaneously deter mined. The results are validated by using both eigenvalue analysis and nonlinear simulation.