Fragility Analysis of Fractional-Order PID Controllers

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Khosravi, Hesameddin | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45332 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Tavazoei, Mohammad Saleh
Abstract:
This thesis, argues on recently published methods for tuning of fractional PID controllers. Proposed algorithms provided tuning rules to achieve design objective such as, phase margin, gain cross-over frequency and zero derivative of the phase versus frequency at cross-over frequency. Third constraint imposed to reach high robustness to gain loop variation for controller. Tuning rules attained by consideration on the insensitivity of both stability and desired performance to the system parameter variations, but not on own controller. At the present paper, based on geometric approach, fragility analysis of the fractional-order of some types of PID setting for considering the robustness of the closed loop systems to influence of perturbations in the controller parameters is accomplished. Moreover, a new method for tuning of fractional order PID which specified as non-fragile controller is proposed
Keywords:
Fractional Order System ; Fractional Proportional-Integral Controller ; Fragility Analysis ; Robustness ; Geometrical-Algebrical Methods in Fragility

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