Assessing the Performance and Robustness of an Improved H_∞-PSS

Abstract

Performance and robustness evaluation of an improved H_∞-PSS is presented in this paper. The proposed H_∞-PSS is compared with the conventional and the optimized PSS which parameters are optimized by minimizing an eigenvalue performance index, taking into account several operating conditions of the power system. Simulation results show that for the nominal operating condition, both the proposed H_∞-PSS and the optimized PSS give similar and better performances than the conventional PSS. However, when the robustness is considered over a wide range of operating conditions, the proposed H_∞-PSS gives a better performance than the optimized PSS.