Design of minimum entropy H∞ excitation controller

A sub-optimal H_infin controller with the minimum entropy bound is designed by researching the characteristic of minimum entropy H_infin optimal control in this paper. The controller which satisfies closed-loop minimum entropy can obtain an important tradeoff between the robustness of H_infin controller and the performance of H_infin controller. The augmented transfer function of generator excitation controller is developed for the single machine infinite bus (SMIB) power system. A new robust nonlinear excitation control strategy for SMIB power system is designed based on minimum entropy H_infin, control. The simulation results show that the proposed minimum entropy H_infin excitation controller improves system robustness on dynamic uncertainties, and suppresses the exogenous perturbation to the system. So the proposed approach can enhance dynamic stability of power system.