کنفرانس مهندسی برق ایران

صفحه اصلی / سی و چهارمین کنفرانس بین المللی مهندسی برق

Isolating Sensor Fault And Cyber Attack For A Class of Nonlinear Systems

نویسندگان :

SAEED MEHRANFAR¹ Farzaneh Abdollahi²

1- Amirkabir University of Technology 2- Amirkabir University of Technology

کلمات کلیدی :

cyber-attack،physical fault،discrimination،cyber physical system،intermediate observer،watermarking

چکیده :

This paper introduces a novel approach combining the Intermediate Observer (IO) with a watermarking technique to effectively isolate simultaneous sensor faults and cyber-attacks in a class of nonlinear systems, considering bounded disturbances and plant uncertainties. Unlike existing methods, this approach is designed without imposing strict conditions on the Cyber-Physical System (CPS), to enhance its practical applicability. The proposed solution utilizes dual IOs and residual analysis to separate and detect abnormal behaviors, providing mitigation of cyber-attacks and sensor faults within the control and command pathways of the CPS. It isolates stealthy (e.g., replay attacks) as well as non-stealthy cyber intrusions, even when the effects mirror sensor faults. The effectiveness of this method is demonstrated through a case study involving a spherical tank level sensor used in oil custody transfer operations, highlighting its potential for real-world applications.