Dwell-Time-Based Robust Stabilization and L₂-Gain Analysis for Asynchronously Switched Linear Systems With Actuator Saturation

• Published in: IEEE transactions on automation science and engineering Vol. 21; no. 4; pp. 6882 - 6891
• Main Authors: Chen, Qi, Ma, Ruicheng
• Format: Journal Article
• Language: English
• Published: IEEE 01.10.2024
• Subjects: Actuator saturation; Actuators; asynchronous switching; Control systems; dwell time; Linear systems; Lyapunov methods; L₂–gain analysis; multiple time-varying piecewise Lyapunov functions (MTVPLFs); robust stabilization; State feedback; switched linear systems; Switched systems; Switches
• ISSN: 1545-5955
• DOI: 10.1109/TASE.2023.3332785

This paper studies the robust stabilization problem and <inline-formula> <tex-math notation="LaTeX">L_{2}- </tex-math></inline-formula>gain analysis for a class of asynchronously switched linear systems with actuator saturation under the dwell time switching signal. The switching signal of the switched controller involves time delay, which results in the asynchronous switching between the candidate controller and the subsystems. The matched state feedback controllers for each subsystem are designed by proposing a new type of multiple time-varying piecewise Lyapunov functions (MTVPLFs), and the computable sufficient conditions for the robust stabilization and <inline-formula> <tex-math notation="LaTeX">L_{2}- </tex-math></inline-formula>gain problem of the studied switched systems are proposed respectively within the framework of a dwell-time switching. The convex hull technique is employed to deal with actuator saturation. Finally, an illustrative example of the problem of the continuously stirred tank reactor is presented to demonstrate the effectiveness of our proposed method. Note to Practitioners-In asynchronously switched linear systems with actuator saturation, the stability of the systems is very important. Actuator saturation is one of the reasons for degrading system performance, and the switching instants of the controllers may lag behind the corresponding subsystems to generate asynchronous switching. The coexistence of actuator saturation and asynchronous switching exacerbates the instability of the switched systems. In view of actuator saturation and asynchronous switching, the asynchronous state feedback controllers for each subsystem are designed by proposing a new type of MTVPLFs and dwell time switching strategy.