March 28, 2024
Valiollah Ghaffari

Valiollah Ghaffari

Academic Rank: Associate professor
Address: Persian Gulf University
Degree: Ph.D in Electrical Engineering
Phone: 07733442269
Faculty: Faculty of Intelligent Systems and Data Science

Research

Title
A Robust Integral Composite Nonlinear Feedback Control for Uncertain System
Type Thesis
Keywords
كنترل انتگرالي، كنترل غير خطي، سيستم هاي داراي عدم قطعيت، اشباع عملگر، كنترل فيدبك غير خطي تركيبي
Researchers Valiollah Ghaffari (Primary advisor) , Amin Torabi Jahromi (Advisor)

Abstract

Generally, achieving robust performance, as well as improving transient response and steady-state accuracy, are main objectives that researchers take into account while analyzing a control problem. The mentioned items would be referred as desired performance indices. So far, various techniques have been presented to investigate each of the aforementioned criterion. However, composite nonlinear feedback (CNF) control is exclusively suggested for enhancing the transient behavior under constraints. In this thesis, to improve the transient performance in regulation problem, a robust CNF control law is developed to uncertain systems in the presence of input saturations. Hence, having a fast response with poor damping ratio, the linear term of the CNF controller is firstly designed to stabilize the closed-loop system. Then the nonlinear section is selected to reduce the overshoot induced by the linear part. The coefficients of the integral controller are numerically obtained using linear matrix inequality (LMI). The proposed scheme is applied to some example with uncertainty and saturated input. The efficiency of the proposed approach will be validated by comparing the results with similar methods.