Event-triggered fixed-time control for marine generator excitation system with super-twisting observer

Abstract

This research proposes a swift and accurate control strategy for a generator’s excitation system being easily perturbed during normal operation. The strategy is developed based on the event-triggered mechanism and fixed-time stabilization theory. To begin with, the mathematical models of the generator and its excitation control system are established, and the impact of external disturbances is analyzed. Then, an event-triggered fixed-time super-twisting observer is introduced to reduce the system’s susceptibility to perturbations by estimating and compensating for them. Simultaneously, a controller is designed using this observer to ensure the system state converges within a fixed time, with the upper bound of convergence time independent of the initial state. Ultimately, Lyapunov theory is employed to validate the fixed-time convergence of the controller and observer while avoiding the Zeno phenomenon. Simulation results confirm the effectiveness of the proposed strategy in detecting and resisting perturbations, improving system performance, and reducing energy consumption and update frequency.