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Networked Distributed Control with both Induced Delay and Packet Dropout

Networked distributed control is one of the leading, effective methodologies to control large-scale systems with interconnected subsystems. However, this methodology faces some serious challenges such as networked induced delays and packet losses which must be considered in the design procedure. In this presentation, modeling, stability analysis and controller design for a non-ideal networked distributed control structure are addressed. The Networked Distributed Control System (NDCS) subject to both random packet loss and random induced delay in the communication link is modeled and an appropriate Lyapunov-Krasovskii functional is constructed to propose a Linear Matrix Inequality (LMI) based sufficient condition for stability analysis of each subsystem. These sufficient conditions are derived in both forms of dependent to and independent of packet loss rate, the amount of delay induced by the network and the amount of delay in the local states of each subsystem. Then, some theorems, based on LMIs, are proposed to design networked distributed controllers that stabilize each subsystem and moreover the global large-scale system. Besides, In order to compensate adverse effects of these two non-idealities of communication network, the use of an interaction estimator in a special class of NDCSs is proposed and the estimation algorithm is presented. Then, the closed-loop system is formulated as a time-dependent impulsive system and an LMI-based sufficient condition for stability analysis of the overall closed-loop impulsive system is proposed. In order to construct a robust control structure for large-scale systems with interconnected subsystems, a Networked Distributed Sliding Mode Control structure is proposed and LMI-based stability analysis and controller design theorems of this structure are obtained. Moreover, allowable state delay bounds as well as interconnection delay bounds, including admissible bounds of packet loss and induced delay, can be calculated using the quasi-convex optimization algorithm presented in this thesis. In each section, a case-study of an industrial process is provided to show effectiveness and applicability of proposed approach.

Type of Seminar:
IfA Internal Seminar
Fahimeh Kazempour
Department of Electrical and Computer Engineering , Isfahan University of Technology, Iran
Dec 06, 2010   14.00

ETF C 109
Contact Person:

John Lygeros
No downloadable files available.
Biographical Sketch:
Fahimeh Kazempour got both her M.Sc. and B.Sc. degrees in electrical engineering-control systems from Isfahan University of Technology, Isfahan, Iran in 2010 and 2008, respectively. Her B.Sc. final project was on "hybrid systems and their analysis tools" and her M.Sc. thesis was devoted to "Networked Distributed Control Systems in Presence of both Delay and Packet Loss". From 2007 till now, she has been working as a research assistant in the Center of Excellence in Control and Industrial Automation, ECE Department, Isfahan University of Technology.