Coordinated stabilizer tuning in large power systems considering multiple operating conditions

This paper describes a new method for the coordinated gain tuning of PSSs, considering multiple operating points. The partial pole placement through the tuning of stabilizer gains is formulated as a nonlinear least squares problem, whose solution is obtained by the Newton method. The original problem is divided into various subproblems that are solved sequentially, in a way that is similar to continuation methods. The residues for the monitored poles, associated with the transfer functions of the stabilizer control loops (Delta V-PSS/Delta V-REF), are assembled into a rectangular matrix at every step of the continuation-like process. Results for the coordinated gain tuning of 36 stabilizers, considering 11 operating conditions, are described for a model of the Brazilian South-Southeast system.