Regular Papers

International Journal of Control, Automation, and Systems 2024; 22(4): 1186-1200

https://doi.org/10.1007/s12555-023-0121-4

© The International Journal of Control, Automation, and Systems

Robust Fault Detection Scheme for Asynchronous Switched Systems via Sliding Mode Observer

Shafqat Ali, Yuchen Jiang*, Hao Luo*, Muhammad Taskeen Raza, Shah Faisal, and Faizan Shahid

Harbin Institute of Technology

Abstract

This work studies the fault detection problem for continuous-time asynchronous switched systems. For residual signal generation, we design a fault detection sliding mode observer such that residual characterizes the fault sensitivity level by H_ performance, and its robustness to process disturbance is determined by H∞ performance. Specifically, the challenge entails addressing the phenomenon of asynchronous switching between the controlled object and the observer, where there is a delay between the switching of the subsystems and the observer. A piece-wise Lyapunov function and average dwell time approach are applied to resolve the asynchronous switching stability within matched and unmatched periods. A feasible solution is derived based on linear matrix inequalities. For effective fault detection, a residual evaluation scheme is provided with a threshold. Finally, simulation results on a buck-boost converter are furnished to validate the usefulness of the proposed approach.

Keywords Asynchronous switched systems, average dwell time, fault detection, H−/H∞ performance index, linear matrix inequality, sliding mode observer.

Article

Regular Papers

International Journal of Control, Automation, and Systems 2024; 22(4): 1186-1200

Published online April 1, 2024 https://doi.org/10.1007/s12555-023-0121-4

Copyright © The International Journal of Control, Automation, and Systems.

Robust Fault Detection Scheme for Asynchronous Switched Systems via Sliding Mode Observer

Shafqat Ali, Yuchen Jiang*, Hao Luo*, Muhammad Taskeen Raza, Shah Faisal, and Faizan Shahid

Harbin Institute of Technology

Abstract

This work studies the fault detection problem for continuous-time asynchronous switched systems. For residual signal generation, we design a fault detection sliding mode observer such that residual characterizes the fault sensitivity level by H_ performance, and its robustness to process disturbance is determined by H∞ performance. Specifically, the challenge entails addressing the phenomenon of asynchronous switching between the controlled object and the observer, where there is a delay between the switching of the subsystems and the observer. A piece-wise Lyapunov function and average dwell time approach are applied to resolve the asynchronous switching stability within matched and unmatched periods. A feasible solution is derived based on linear matrix inequalities. For effective fault detection, a residual evaluation scheme is provided with a threshold. Finally, simulation results on a buck-boost converter are furnished to validate the usefulness of the proposed approach.

Keywords: Asynchronous switched systems, average dwell time, fault detection, H−/H∞ performance index, linear matrix inequality, sliding mode observer.

IJCAS
April 2024

Vol. 22, No. 4, pp. 1105~1460

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