Enhancing Cybersecurity in Nonlinear Networked Control Systems Through Robust PI Controller Design and Implementation Against Denial-of-Service Attacks

Networked control systems (NCS) offer the fusion of control technology and modern information systems, delivering numerous advantages. However, this integration also presents security concerns, especially for critical infrastructure. NCS communication channels face vulnerability to cyber threats like Denial-of-Service (DoS) attacks, leading to issues such as delays, data loss, reduced control performance, and potential system instability. Introducing the liquid-level control system, which exhibits nonlinearity, this article explores the practical design and implementation of PI controllers within NCS. In this article, robust PI controllers are designed by Kharitonov's theorem. DoS attacks are applied practically to the NCS, utilizing Kali Linux in order to assess how the system behaves in response to different PI controller coefficients. This approach allows us to investigate the system performance under DoS attacks. The experimental results demonstrate that when PI controller coefficients are appropriately chosen, the impact of DoS attacks on system behavior and performance can be mitigated.