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OPTIMIZATION-BASED DECOMPOSITION OF A LARGE-SCALE SYSTEM

IFAC Proceedings Volumes 2006年第14期39卷 47-52页

作者： Branislav Rehák Czech Technical University Faculty of Electrical Engineering Department of Control Engineering Technická 2 166 27 Praha 6 Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic. P.O. Box 18 182 08 Prague Czech Republic

The problem of design of a controller for a large-scale system is studied. The design objective is to achieve behavior comparable with the standard controller that is LQ optimal. On the other hand the amount of interconnections between subsystems should be kept as small as possible. This is guaranteed by solving of an optimization problem where the number of interconnections is minimized while the difference in the values of the cost functional for the standard and decentralized controller is a constraint. To find the value of the cost of the decentralized control in presence of interconnections one can use linear matrix inequalities.

关键词： Decomposition decentralized control linear matrix inequalities

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Hardware and software design for an electromagnetic induction tomography (EMT) system for high contrast metal process applications

Hardware and software design for an electromagnetic inductio...

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作者： Ma, X. Peyton, A.J. Higson, S.R. Lyons, A. Dickinson, S.J. School of Electrical and Electronic Engineering University of Manchester Manchester M60 1QD United Kingdom Corus RD and T Teesside Technology Centre Corus UK Ltd. Middlesbrough TS6 6UB United Kingdom Metal Process Control AB Kungsgaten 16 S-611 26 Nykoping Sweden Engineering Department Lancaster University Lancaster LA1 4YR United Kingdom

This paper presents the latest development of an EMT system designed for use in the metal production industry such as imaging molten steel flow profiles during continuous casting. The system that has been developed is based on a commercial data acquisition board residing in a PC host computer and programmed in the LabView graphical language. The paper reviews the new EMT hardware electronics and software. The noise effects and the detectability limits of the system are given in the paper followed by the system sensitivity map analysis. Optimal image reconstructions, including the simultaneous iterative reconstruction technique (SIRT) and non-iterative Tikhonov regularization, truncated singular value decomposition (TSVD), are also discussed and applied for the system. The system has been demonstrated in real time (10 frames s-1for 5 kHz excitation) with test phantoms that represent typical metal flow profiles such as central, annular stream and multiple streams.

关键词： Tomography

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Nonlinear Dynamical Decoupling controller using Multiple Neural Network Models

Nonlinear Dynamical Decoupling Controller using Multiple Neu...

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World Congress on Intelligent control and automation (WCICA)

作者： Xin Wang Zhongjie Wang Shaoyuan Li Hui Yang Institute of Information & Control Technology Center of Electrical & Electronic Technology Shanghai Jiaotong University Shanghai China Department of Control Science & Engineering University of Tongji Shanghai China Institute of Automation Shanghai Jiaotong University Shanghai China School of Electrical & Electronic Engineering East China Jiao Tong University Jiangxi China

A multiple models neural network decoupling controller is designed to control the multivariable nonlinear discrete time system. First, at each equilibrium point, one neural network is trained offline to identify the linear term of the nonlinear system while the other neural network is trained online to identify the nonlinear term. Then the multiple models is composed of all models which is got from each equilibrium point. According to the switching index, the best model is selected as the system model. So, for the selected model, the nonlinear term is viewed as the measurable disturbance and eliminated using feedforward strategy. By the choice of the polynomial matrices, the poles of the linear term can be placed arbitrarily and the dynamical decoupling controller is designed accordingly. The simulation example shows effectiveness of the proposed system

关键词： Neural networks Automatic control Nonlinear control systems Electronic mail Design engineering Design automation Discrete time systems Nonlinear systems Polynomials Intelligent control

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Multivariable Adaptive Decoupling controller using Hierarchical Multiple Models

Multivariable Adaptive Decoupling Controller using Hierarchi...

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World Congress on Intelligent control and automation (WCICA)

A hierarchical multiple models direct adaptive decoupling controller is designed to solve the problem such as too many models, long computing time and so on. The best model is searched in each level according to the switching index and fixed model set is set up in next level dynamically. By the choice of the weighting polynomial matrix, it not only eliminates the steady output error, places the poles of the closed loop system arbitrarily, but also decouples the system dynamically. At last, to this multiple models switching system, the global convergence is obtained under the common assumptions and the convergence property of the controller parameter set is proved too. When compared with the convenient multiple models adaptive controller, it reduces the number of the fixed models greatly. If the same number of the fixed models is used, system transient response and decoupling result are improved

关键词： Programmable control Adaptive control Automatic control Design engineering Convergence Design automation Polynomials Closed loop systems Switching systems Transient response

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A Study of Supercapacitor Parameters and Characteri stics

A Study of Supercapacitor Parameters and Characteri stics

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International Conference on Power System Technology (POWERCON)

作者： Y. Y. Yao D. L. Zhang D. G. Xu Power Electronics and Motion Control Research Center Shenzhen Graduate School Harbin Institute of Technology Shenzhen China Electrical Engineering and Automation Department Harbin Institute of Technology Harbin China

The supercapacitor is a high efficient and green energy storage component that offers intensive charging and discharging current and performs a perfect reliability and cycling ability. In this paper, three topics are discussed for supercapacitor-based system research and application. Firstly, a comparison among several parameter models of the supercapacitor is presented. In the same time, the characteristics of ESR (equivalent series resistance) and EPR (equivalent parallel resistance) are described and studied. Secondly, the methods of voltage sharing and overvoltage protection for series connected supercapacitors are discussed, and their advantages and disadvantages are compared with each other. Thirdly, a radiation experiment is taken to examine the supercapacitor in its anti-radiation ability for spaceflight application.

关键词： Supercapacitors Paramagnetic resonance Voltage Capacitance Capacitors Power transmission lines Transmission line theory Electronic mail Contact resistance Fabrication

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Design and Optimization for a Supercapacitor Application System

Design and Optimization for a Supercapacitor Application Sys...

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International Conference on Power System Technology (POWERCON)

作者： N. S. Zhai Y. Y. Yao D. I. Zhang D. G. Xu Power Electronics and Motion Control Research Center Shenzhen Graduate School Harbin Institute of Technology Shenzhen China Electrical Engineering and Automation Department Harbin Institute of Technology Harbin China

Supercapacitors present many advantages in the energy storage field in comparison with batteries and electrostatic capacitors. To obtain an optimal solution for energy saving, combination schemes of supercapacitors and batteries are worthy of discussion. This paper describes the discharging process of the supercapacitors and some key problems to be solved in applications. Moreover, two methods for designing supercapacitor-battery hybrid systems are presented and compared. Furthermore, voltage balancing and overvoltage protection are discussed in this paper to improve the efficiency of the system and size the system optimally and economically.

关键词： Design optimization Supercapacitors Batteries Energy storage Electrostatics Capacitors Design methodology Voltage control Protection Power generation economics

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ROBUST STABILITY CHECKING OF A CLASS OF LINEAR INTERVAL FRACTIONAL ORDER SYSTEM USING LYAPUNOV INEQUALITY

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IFAC Proceedings Volumes 2006年第11期39卷 89-94页

作者： Hyosung Ahn YangQuan Chen Igor Podlubny Center for Self-Organizing and Intelligent Systems (CSOIS) Department of Electrical and Computer Engineering Utah State University Logan UT 84322-4160 USA Department of Applied Informatics and Process Control Technical University of Kosice B. Nemcovej 3 04200 Kosice Slovak Republic

This paper provides a new analytical robust stability checking method of fractional-order linear time invariant interval uncertain system. This paper continues the authors’ previous work (Chen et al., 2005a) where matrix perturbation theory was used. For the new robust stability checking, Lyapunov inequality is utilized for finding the maximum eigenvalue of a Hermitian matrix. Through numerical examples, the usefulness and the effectiveness of the newly proposed method are verified.

关键词： Fractional order linear dynamic systems robust stability interval linear time invariant systems interval matrix

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High precision location algorithm for optical feature of vision measurement

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Journal of Physics: Conference Series 2006年第1期48卷 474-478页

作者： Liu, C.Y. Che, R.S. Gao, Y.H. College of Instrumentation and Electrical Engineering Jilin University Changchun 130001 China Department of Automation Measurement and Control Harbin Institute of Technology Harbin 150001 China

To meet the requirement for precision location of optical feature in the vision coordinates measurement system based on optical features imaging, the Gauss distribution multi-fitting location algorithm based on bilinear interpolation was presented in the paper. The method fit the grey distribution of optical feature imaging by Gauss distribution function, and the mathematics model was constructed on grey value of pixel points in the object image, coordinates location and centre of optical feature using the grey value height relativity among the pixels points in the feature image and the location of feature was estimated precisely. In the same, the bilinear interpolation algorithm and multi-fitting method were used to improve the location precision of the location algorithm presented. Finally, the experiment results show that the standard deviation is 0.0055 pixels and the repeatability is less than 0.011 pixels and prove the method holds good location precision and can locate for optical feature precisely. © 2006 IOP Publishing Ltd.

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Static controller for ventilation of highway tunnels

Static controller for ventilation of highway tunnels

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作者： Ferkl, Lukáš Meinsma, Gjerrit Sládek, Oto Department of Control Engineering Faculty of Electrical Engineering Czech Technical University in Prague Technická 2 166 27 Praha 6 Czech Republic Department of Applied Mathematics Faculteit EWI University of Twente P.O. Box 217 7500 AE Enschede Netherlands Kybertec Ltd. Tovární 1112 537 01 Chrudim Czech Republic Center for Applied Cybernetics Institute of Information Theory and Automation Academy of Sciences of the Czech Republic Pod vodárenskou věží 4 182 08 Praha 8 Czech Republic

A control scheme for highway tunnels is proposed based on a static model of the highway tunnel. The controller is designed to keep the exhaust levels inside the tunnel below given limits. The controller is derived in two stages. First, a controller for an isolated ventilation section is found. Then a controller for a complex tunnel is obtained and the control is optimized by means of linear programming. The control is then simulated on a dynamical model of a highway tunnel.

关键词： controllers

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Delay-dependent stability condition for uncertain linear 2-D state-delayed systems

Delay-dependent stability condition for uncertain linear 2-D...

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IEEE Conference on Decision and control

作者： Wojciech Paszke James Lam Krzysztof Galkowski Shengyuan Xu Anton Kummert Institute of Control and Computation Engineering University of Zielona Góra Zielona Góra Poland Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong Department of Automation Nanjing University of Science and Technology of PLA Nanjing China Department of Automation Nanjing University of Science and Technology Nanjing P. R. China Faculty of Electrical Information and Media Engineering University of Wuppertal Wuppertal Germany

ISBN: (纸本)1424401704

This paper addresses the problem of robust stability for uncertain two-dimensional systems with delays in the state. The uncertainty is assumed to be of norm-bounded form. To solve this problem, the Lyapunov second method is used. The resulting condition is written in terms of linear matrix inequalities and it is dependent on the size of delays. This fact allows us to reduce the conservatism in the stability analysis of two-dimensional systems with state delays. A illustrative example is given to illustrate the theoretical developments

关键词： Delay systems Linear systems Symmetric matrices Delay lines control systems Robust stability Linear matrix inequalities USA Councils Two dimensional displays Uncertainty

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