International Journal of Power Electronics and Drive System (IJPEDS) Vol. 3, No. 2, June 2013, pp. 155~169 ISSN: 2088-8694  155 Journal homepage: http://iaesjournal.com/online/index.php/IJPEDS Speed Synchronization of web winding System with Sliding Mode Control Hachemi Glaoui, Abdeldejbar Hazzab, Bousmaha Bouchiba, Ismaïl Khalil Bousserhane Laboratory of command Analysis and Optimization of the Electro-Energizing Systems, Faculty of Sciences and technology, BECHAR University B.P. 417 BECHAR, 08000 Article Info ABSTRACT Article history: Received Jan 16, 2013 Revised Apr 23, 2013 Accepted May 17, 2013 A continuous web winding system is a large-scale, complex interconnected dynamic system with numerous tension zones to transport the web while processing it. There are two control schemes for large-scale system control: the centralized scheme and the decentralized scheme. Centralized control is the traditional control method, which considers all the information about the system to be a single dynamic model and design a control system for this model. A speed synchronization control strategy for multiple induction motors, based on adjacent cross-coupling control structure, is developed by employing total sliding mode control method. The proposed control strategy is to stabilize speed tracking of each induction motor while synchronizing its speed with the speed of the other motors so as to make speed synchronization error amongst induction motors converge to zero. The global stability and the convergence of the designed controller are proved by using Lyapunov method. Simulation results demonstrate the effectiveness of the proposed method. Keyword: Winding system Induction motor Proportional- Integral (PI) Sliding mode control SISO Sliding mode control MIMO Copyright © 2013 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: Hachemi Glaoui, Faculty of Sciences and technology, BECHAR University B.P. 417 BECHAR, 08000 Email: mekka60@gmail.com 1. INTRODUCTION Web winding systems are common in the manufacture, fabrication, and transport of any materials such as paper, metal, and photographic film. A continuous web processing line is a large-scale, complex interconnected dynamic system with numerous tension zones to transport the web while processing it. A continuous web processing line is also a web transporting system which consists of a combination of some basic mechanical/electrical elements, such as unwinder, rewinder, roller, free web span, measuring sensors, and driving motors. With the rapid development of modern manufacturing, a challenging problem in modern induction motor control field is that the motion of multiple motors must be controlled in a synchronous manner, for instance of distributed papermaking machines, continuous rolling mills, print works, and spinning works. The performance of synchronization control affects the reliability and precision of product seriously [1]. In multiple-motor applications, the synchronization performance of the system may be degraded by many factors such as disturbances in the load and system parameters variation due to environmental changes [2−3], thus high performance synchronization control of multiple induction motors is important in practice. In this article, total sliding mode control is adopted in adjacent cross-coupling control structure to implement speed synchronization of multiple induction motors. The speed synchronization strategy is to stabilize synchronization errors between each motor and the other two motors to zero. The tracking error controllers and the synchronization error controllers both include an equivalent control law and a robust control law, which makes the stable tracking performances and synchronization performances are ensured against the system uncertainties. Simulations on a five motor system are given, and