Parameter ranges for robust gain tuning of power systems stabilizers

This work proposes a computational tool to assist power system engineers in the field tuning of power system stabilizer (PSS) gains. The aim of the proposed approach is to generate a range of gain values for PSSs within which there is a theoretical guarantee of stability for the closed-loop system. This range is given as a set of limit values for the gains of the PSSs of interest. Parameter values belonging to the parameter range generated by the approach formally assure a robust tuning and a minimum performance index for the power system with the tuned controllers. In this way, the engineer responsible for the field tuning of these stabilizers can be confident with respect to system stability when adjusting the corresponding gains within this range. The proposed tool is evaluated in a benchmark system for small signal stability studies.