Design of Control for Fractional Order Systems with Output Constraints

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Sadeghi, Hamed | 2021

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53938 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Sharokhi, Mohammad
Abstract:
Identifying fractional systems and designing controllers for these systems is one of the leading challenges due to their limitations. Systems can have constraints on output, input, and states. These constraints make it difficult to design a controller. In this project, controller design methods for fractional-order systems with output constraints are investigated. A controller is designed for a strict feedback nonlinear system with unknown dynamics subject to asymmetric and variable output constraints, unknown direction of the controller, and unmeasurable states. To design the controller, the direct and backstepping technique is used and the Lyapunov barrier function is applied for the first stage of design. Fuzzy intelligent estimators have been used to deal with the unknown dynamics of the system. First, the performance of the controller has been tested on a numerical system with all mentioned constraints. In the second simulation, a system consisting of two series-connected reactors is considered and the performance of the controller on this system is investigated. The results of these simulations show that the designed controller satisfactorily meets the control objectives
Keywords:
Fractional Order System ; Closed Loop Stability ; Observer ; Unknown Dynamics ; Output Constraint

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