Dynamic Event-Triggered Control for Switched Linear Systems Under DoS Attacks and its Application to DC Microgrids
Cong Wei, Yajing Ma, Xiangpeng Xie, Ju H. Park
Abstract
This paper proposes a novel dynamic event-triggered mechanism (DETM) of a switched linear DC microgrid with intermittent denial-of-service (DoS) attacks. In a switched linear system based on DETM, the subsystem mode is immediately updated along with the occurrence of switching signals, while the controller mode is updated after a successful event-triggering. This means both communication interruptions and periodic sampling may cause asynchronous switching situations, which together pose a challenge for stability analysis. To this end, a multiple Lyapunov function that can simultaneously describe subsystem mode and controller mode is adopted, and a new DETM based on acknowledgement character technique (ACK) is studied to ensure input-to-state stability (ISS) of the system. Meanwhile, the maximum allowed DoS duration is first studied to further analyze the relationship between DoS parameters, event-triggered parameters, and system stability. By utilizing ACK, the system can detect the end of the DoS attack and remain ISS under dynamic event-triggered control. Finally, simulation verification is conducted in a switched DC microgrid.