Decentralized Periodic Event-Triggered Load Frequency Control for Multiarea Power Systems

This study addresses the frequency control problem in multiarea power systems through the design of a decentralized periodic event-triggered scheme (DPETS). Initially, a unified discrete-time multiarea model is developed for power systems by adopting the general discretization method. Subsequently, a discrete-type DPETS is designed, relying solely on the locally available area control error to determine the time instants for transmitting the control signal to the equivalent generating unit. Furthermore, the ultimate boundedness of power systems under time-varying load demand disturbance is demonstrated by constructing novel discrete-time Lyapunov-Krasovskii functionals, leading to a rigorous bound of ultimate states. Finally, a case study involving three-area interconnected power systems is presented to validate the feasibility of the designed control strategy.