Nonlinear large disturbance attenuation controller design for the generator excitation systems

The nonlinear large disturbance attenuation control scheme is investigated based on the backstepping method for the single-machine infinite-bus excitation system. Focus is given on the effect of the generator rotor on the output of the system by unknown external disturbances. The minimax method is used to reduce effectively the conservativeness of the disturbance treatment, which is brought by the estimation of the upper bound of the disturbance and the inequality scaling. The purpose is to ensure the good robustness and insensitivity to large disturbances. By considering the effect of the short-circuit ground fault and the mechanical power of disturbances, a use case of the single-machine infinite-bus system is researched. Simulation results show that the control scheme can effectively improve the dynamic process of the transient stability of the power system.