Memory-Event-Triggered H∞ Load Frequency Control of Multi-Area Power Systems with Cyber-Attacks and Communication Delays

Abstract

This article focuses on H∞ load frequency control (LFC) of multi-area power systems with cyber-attacks and communication delays by a memory-event-triggered mechanism (METM). The dynamics of power system components, such as governor, turbine and power generator, are imitated by some circuit systems. To save the precious network bandwidth, a METM is constructed to decide which measured data should be transmitted as the control signal. In contrast to some memoryless ETMs, the proposed METM uses historic data over a fixed period. To guarantee no Zeno behavior, a positive constant time is waited after each trigger happens. By treating the exchanges of tie-line power between the ith control area and other areas as exogenous disturbances, a novel decentralized distributed delay system is modeled to represent the decentralized H∞ LFC of a multi-area power system under the proposed METM with deception attacks and communication delays. By selecting a Lyapunov-Krasovskii functional (LKF) based on the distributed delay terms, new sufficient criterions are obtained to co-design the H∞ LFC controller and triggering parameters for power systems against deception attacks. Finally, the advantages of the presented method is shown via an illustrative case.