Semi-Global Observer-Based Secure Consensus of Multi-Agent Systems with Input Saturation and Denial-of-Service Attacks

This paper addresses the problem of achieving secure consensus control in multi-agent systems (MASs) operating on directed graphs under the challenges of input saturation and periodic denial-of-service (DoS) attacks. The motivation behind this study is to ensure robust performance and security in MASs. To tackle input saturation, a distributed controller is designed using a parametric algebraic Riccati equation-based low-gain output-feedback control approach. This method ensures that control inputs remain within operational limits while maintaining stability. Additionally, leveraging the Lyapunov stability theory, this paper presents a comprehensive analysis of the impact of DoS attacks, focusing on their frequency and average duration, and guarantees semi-global secure consensus under these conditions. Simulation results including a circuit system demonstrate the effectiveness and advantages of the proposed approach.