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Event-Triggered Control Systems

  • Author / Creator
    Mousavi, Seyed H.
  • Event-triggered control have increasingly become an active area of research in the last decade, thanks to their potential capability in reducing data communication between subsystems during control action. In this research we tackle some practical problems encountered in this field and endeavor to improve the state of the art. We first start by designing periodic event-triggered control (PETC) for both state feedback and output feedback systems. PETC is a subclass of even-based systems, where the triggering conditions (TCs) are verified on a clock-driven basis. Despite their efficiency and advantages from practical of view, they have received less attention, compared to the other classes of event-driven systems. we first consider designing state feedback PETC for a class of nonlinear systems. We then, extend our result to the more challenging case of output feedback systems where, two independent TCs (with different sampling rates) are considered for plant and controller. In the next part of this research we study the effect of noise in the implementation of event-based systems. Basically, the destructive impact of noise has been largely ignored in these class of systems. In this regard, first it is shown that how the output measurement noise can easily trigger unnecessary samples and deteriorate the performance of the systems. Then a novel triggering mechanism is proposed which reduces the effect of noise in the event-triggering scheme. Next, the same idea is extended to the observation problem, and a noise effective event-based observer is designed for LTI systems which assures $H_{\infty}$ performance for the estimation error. We then turn our attention to the fundamental problem of designing stable non-conservative event-triggered systems. We claim that most of the work reported in the literature is based on Lyapunov conditions that carry some intrinsic conservatism. We propose a novel integral-based condition that relaxes the strong conditions previously reported and can reduce communication between plant and controller. Finally, we consider decentralized event-triggered control for a class of nonlinear systems. We propose new decentralized TCs and show their efficiency compared to existent results.

  • Subjects / Keywords
  • Graduation date
    2016-06:Fall 2016
  • Type of Item
    Thesis
  • Degree
    Doctor of Philosophy
  • DOI
    https://doi.org/10.7939/R3FN10X79
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Doctoral
  • Department
    • Department of Electrical and Computer Engineering
  • Specialization
    • Control Systems
  • Supervisor / co-supervisor and their department(s)
    • Marquez, Horacio J. (Electrical and Computer Engineering)
  • Examining committee members and their departments
    • Zhao, Qing (Electrical and Computer Engineering)
    • De Ruiter, Anton (Aerospace Engineering)
    • Tavakoli, Mahdi (Electrical and Computer Engineering)
    • Prasad, Vinay (Chemical and Materials Engineering)