The closed-loop characteristic polynomial as a means to obtain robust performance of conventional PSS

This paper is aimed at describing a technique to improve the damping of inter-area modes in power systems. This technique consists of coordinate power system stabilizers (PSSs) in order for the system to exhibit a good performance under different operating conditions, and it is based on the evaluation of the closed-loop characteristic polynomial on a frequency interval. Analysis of controllability, observability and participation factors are employed in the location of the PSSs. Results on an actual electrical grid are presented showing the applicability of the proposed technique.