Decentralized event-triggered sliding mode scheme for frequency regulation of multi-area power systems under deception attacks

This paper investigates the frequency regulation problem of networked multi-area power systems subject to random deception attacks. Due to the increasing integration of wireless communication devices in power systems, the frequency stability highly relies on the efficiency and security of information transmission. To alleviate the communication burden, a decentralized dynamic event-triggered (ET) scheme is proposed, in which each area transmits the measurement via its own ET rule. Moreover, the coefficients of dynamic variables are designed based on the state variations and the attack probability for different areas. Then, a decentralized ET sliding mode controller is proposed to restore the frequency. Both the mean square exponentially ultimate boundedness of the power systems and reachability of the specified sliding surface are analyzed, and the corresponding conditions are given. Compared with the widely adopted centralized schemes, the proposed decentralized ET control scheme is easier to implement and can ensure more reasonable transmission considering attack probability for different areas; meanwhile, the deception attacks on different areas are considered to occur independently. Finally, simulation results of a three-area power system are provided.