Mixed sensitivity H∞ controller design for power systems

An H_∞-based controller is designed for a large-scale electrical power system to improve its dynamical performance. Emphasis is placed on reducing the interaction among generator terminal voltage outputs. By means of the mixed sensitivity approach, a significant improvement in the sensitivity gain over the design frequency range was obtained, while maintaining a satisfactory margin of robustness against output multiplicative model perturbation. The results obtained indicate the potential applicability of H _∞ theory to the design of controllers for power systems