Codesign of Fault Detection Observer and Event‐Triggered Controller for Cyber‐Physical Power System Under DoS Attacks

ABSTRACT

Focusing on cyber‐physical power systems (CPPSs) affected by aperiodic denial‐of‐service (DoS) attacks, a codesign approach for a robust fault detection observer and an event‐triggered controller is developed in this paper. First, a fault detection observer is deployed to generate a residual signal for CPPS with external disturbance and actuator fault signals. Subsequently, a resilient event‐triggered mechanism (ETM) is designed for reducing the bandwidth load of communication networks and mitigating the impact of DoS attacks. Next, based on the established framework, a switched residual system is constructed, and criteria for the exponential stability and weighted performance of the residual system are obtained by means of the piecewise Lyapunov functional method. The fault detection observer and event‐triggered controller gains can be obtained by solving linear matrix inequalities. Finally, simulation results under different scenarios are given to verify the feasibility of the proposed scheme.