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A Study On Iterative Learning control With Adjustment Of Learning Interval For Monotone Convergence In The Sense Of Sup-Norm

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Asian Journal of control 2008年第1期4卷

作者： Kwang-Hyun Park Zeungnam Bien Division of EE Department of EECS Korea Advanced Institute of Science and Technology 373–1 Kusong-dong Yusong-gu Taejon 305–701 Korea. Zeungname Bien:received the B.S. degree in electronics engineering from Seoul National University Seoul Korea in 1969 and the M.S. and Ph.D. degrees in electrical engineering from the University of Iowa Iowa City Iowa U.S.A. in 1972 and 1975 respectively. During 1976–1977 academic years he taught as assistant professor at the Department of Electrical Engineering University of Iowa. Then Dr. Bien joined Korea Advanced Institute of Science and Technology summer 1977 and is now Professor of Control Engineering at the Department of Electrical Engineering and Computer Science KAIST. Dr. Bien was the president of the Korea Fuzzy Logic and Intelligent Systems Society during 1990–1995 and also the general chair of IFSA World Congress 1993 and for FUZZ-IEEE99 respectively. He is currently co-Editor-in-Chief for International Journal of Fuzzy Systems (IJFS) Associate Editor for IEEE Transactions on Fuzzy Systems and a regional editor for the International Journal of Intelligent Automation and Soft Computing. He has been serving as Vice President for IFSA since 1997 and is now Chief Chairman of Institute of Electronics Engineers of Korea and Director of Humanfriendly Welfare Robot System Research Center. His current research interests include intelligent control methods with emphasis on fuzzy logic systems service robotics and rehabilitation engineering and large-scale industrial control systems. Kwang-Hyun Park:received the B.S. M.S. and Ph.D. degrees in electrical engineering and computer science from KAIST Korea in 1994 19997 and 2001 respectively. He is now a researcher at Human-friendly Welfare Robot System Research Center. His research interests include learning control machine learning human-friendly interfaces and service robotics.

It has been found that some huge overshoot in the sense of sup-norm may be observed when typical iterative learning control (ILC) algorithms are applied to LTI systems, even though monotone convergence in the sense of λ-norm is guaranteed. In this paper, a new ILC algorithm with adjustment of learning interval is proposed to resolve such an undesirable phenomenon, and it is shown that the output error can be monotonically converged to zero in the sense of sup-norm when the proposed ILC algorithm is applied. A numerical example is given to show the effectiveness of the proposed algorithm.

关键词： Iterative learning control monotone convergence learning interval sup-norm

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MODELING AND control OF ELEVATORS BY STATECHARTS

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Asian Journal of control 2008年第2期6卷

作者： Yi-Sheng Huang Sheng-Luen Chung Mu-Der Jeng Department of Aeronautical Engineering Chung Cheng Institute of Technology National Defense University Tashi Taoyuan 335 Taiwan R.O.C. Department of Electrical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan R.O.C. Department of Electrical Engineering National Taiwan Ocean University Kellung 202 Taiwan R.O.C. MuDer Jeng received the Ph.D. degree in computer and systems engineering from Rensselaer Polytechnic Institute Troy NY in 1992. Since August 1992 Dr. Jeng has been with National Taiwan Ocean University Keelung Taiwan where he is currently a full Professor at the Department of Electrical Engineering. His current research interests include Petri nets discrete event systems computer integrated manufacturing semiconductor factory automation embedded systems. Dr. Jeng is the author/co-author of over 120 book chapters journal papers and conference papers. Dr. Jeng received the Franklin V. Taylor Outstanding Paper Award from the IEEE Systems Man and Cybernetics Society in 1993. He was granted the Research Award by the National Science Council of Taiwan annually from 1994 to 2000. He is an Associate Editor for IEEE Transactions on Systems Man and Cybernetics-Part A IEEE Transactions on Robotics and Automation IEEE Transactions on Robotics and serves on the Editorial Board of International Journal of Computer Integrated Manufacturing. He has been a Guest Editor for eight leading journals. Dr. Jeng is the Chair of the Technical Committee on Discrete Event Systems of the IEEE SMC Society and the Founding Chair of the Technical Committee on Semiconductor Factory Automation of the IEEE Robotics and Automation Society. He served as the Exhibitions Chair of 2003 IEEE International Conference on Robotics and Automation and the Special Sessions Chair of 2004 IEEE International Conference on Networking Sensing and Control. He serves as a Program Co-Chair of 2005 IEEE International Conference on Networking Sensing and Control and the Organization Commit

Statechart has been utilized as a visual formalism for the modeling of complex and interactive systems for its illuminating features on describing properties of causality, concurrency, and synchronization. This paper presents the application of satechart to the modeling, design and implementation of an elevator system, whose system behavior involves aggregating complexity of state descriptions, and imposition of underlying control policy. Based on the operational flow of an elevator, we derive the associated statechart model by looking into the inherent hierarchical structure of the elevator. The advantage of the proposed approach is the clear presentation of system behavior in terms of conditions and events that cause the transitions in system dynamics. Implementation of the controlled elevator based on the modeled statechart is also presented.

关键词： Statechart interactive systems elevator

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MARKOV DECISION PROCESSES WITH UNCERTAIN TRANSITION RATES: SENSITIVITY AND MAX HYPHEN MIN control

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Asian Journal of control 2008年第2期6卷

作者： Suresh Kalyanasundaram Edwin K. P. Chong Ness B. Shroff Motorola India Electronics Limited No. 66/1 Plot 5 Bagmane Techpark C. V. Raman Nagar Post Bangalore 560 093 India. Department of Electrical and Computer Engineering Colorado State University Fort Collins CO 80523-1373 USA. Professor Edwin K. P. Chong received the B.E.(Hons.) degree with First Class Honors from the University of Adelaide South Australia in 1987 graduating top of his class and the M.A. and Ph.D. degrees in 1989 and 1991 respectively both from Princeton University where he held an IBM Fellowship. He joined the School of Electrical and Computer Engineering at Purdue University in 1991 where he was named a University Faculty Scholar in 1999 and promoted to Full Professor in 2001. Since August 2001 he has been a Professor of Electrical and Computer Engineering and Professor of Mathematics at Colorado State University. His current interests are in communication networks and optimization methods. He coauthored the best-selling book An Introduction to Optimization 2nd Edition Wiley-Interscience 2001. He received the NSF CAREER Award in 1995 and the ASEE Frederick Emmons Terman Award in 1998. He coauthored a paper that was awarded Best Paper in the journal Computer Networks 2003. Professor Chong is a Fellow of the IEEE. He was founding chairman of the IEEE Control Systems Society Technical Committee on Discrete Event Systems and until recently served as an IEEE Control Systems Society Distinguished Lecturer. He has been on the editorial board of the IEEE Transactions on Automatic Control. He is currently on the editorial board of the journal Computer Networks. He has also served on the organizing committees of several international conferences. He has been on the program committees for the IEEE Conference on Decision and Control the American Control Conference the IEEE International Symposium on Intelligent Control IEEE Symposium on Computers and Communications and the IEEE Global Telecommunications Conference. He has also served in the executive committees for the IEEE Co

Solution techniques for Markov decision problems rely on exact knowledge of the transition rates, which may be difficult or impossible to obtain. In this paper, we consider Markov decision problems with uncertain transition rates represented as compact sets. We first consider the problem of sensitivity analysis where the aim is to quantify the range of uncertainty of the average per-unit-time reward given the range of uncertainty of the transition rates. We then develop solution techniques for the problem of obtaining the max-min optimal policy, which maximizes the worst-case average per-unit-time reward. In each of these problems, we distinguish between systems that can have their transition rates chosen independently and those where the transition rates depend on each other. Our solution techniques are applicable to Markov decision processes with fixed but unknown transition rates and to those with time-varying transition rates.

关键词： Markov decision processes sensitivity max-min control call admission control policy iteration

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Global performance measurement of a stand-alone photovoltaic system

Global performance measurement of a stand-alone photovoltaic...

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IEEE/PES Transmission and Distribution Conference and Exposition Latin America

作者： Shayani, R. A. Oliveira, M. A. G. Johnson Control's Building Automation System Brazil Department of Electrical Engineering IEEE Brazil Council Brazil

ISBN: (纸本)9781424402878

The panel efficiency of a stand-alone photovoltaic system is usually used to define the performance of the entire system. The typical efficiency value for silicon modules is about 15%. The performance of all components is a number hard to be known. This paper aims to determine the fully efficiency of the entire PV system, calculating the electrical energy from the frequency inverter output and the total solar energy from the Sun. The relationship between the array and the lead-acid battery dimensioning is shown;the best practices try to reduce the premature capacity loss of the battery, but it also reduces the global performance of the system. An experimental procedure measured the real efficiency of an entire system, that is about 50% of the solar radiation available over the solar modules, which is different from the 84% rate available from the bibliography.

关键词： photovoltaic power systems solar energy solar power generation solar radiation

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Investigation of transient performance of Capacitor Voltage Transformer

Investigation of transient performance of Capacitor Voltage ...

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1st International Power and Energy Conference (PECon 2006)

作者： Bakar, Ab. Halim Abdul Lim, Cheng Hock Mekhilef, Saad Protection Department Transmission Division TNB Electrical Energy and Power System Universiti Malaya Malaysia Department of Electrical Engineering University of Malaya Center for Research Power Electronics and Drives Automation and Control

ISBN: (纸本)9781424402731

This paper reports the digital-time domain and frequency domain studies on a typical 132kV Capacitor Voltage Transformer (CVT) model. The transient studies are conducted using Alternative Transient program (ATP-EMTP). Simulation results corresponding to the CVT transient response under both system fault and ferroresonance condition are reported in this paper. Transient studies are performed (1) to identify the CVT components that contribute to the transient response of CVT, (2) to determine system condition that affect the CVT transient response. A lightning simulation case study is also presented.

关键词： CVT ferroresonance ATP-EMTP

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Selective Harmonic Elimination in Multi-Modules Three-Phase Current-Source Converters

Selective Harmonic Elimination in Multi-Modules Three-Phase ...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Johan I. Guzman Jose R. Espinoza Navid R. Zargari Luis A. Moran Department of Electrical Engineering Concepcion University Concepcion Chile Rockwell Automation Canada Control System Cambridge ONT Canada

Modular current source converters (MCSC) can enhance the current capacity and improve the power quality at medium voltage PWM motor drives. A MCSC uses individual three-phase modules in a shunt connection to share the total power in a symmetrical manner. The modulation of these units is normally done using optimized patterns as selective harmonic elimination (SHE). However, the optimization is usually performed at each module. This paper proposes a modulating technique that optimizes the operation of a MCSC built up of P modules. Thus, for the same switching frequency, P times the number of harmonics are removed from the injected ac current as compared to the regular approach. A complete mathematical formulation as well as experimental results validate the theoretical considerations

关键词： Pulse width modulation Pulse width modulation converters Medium voltage Topology Switching frequency Power harmonic filters Power semiconductor switches Pulse width modulation inverters Space vector pulse width modulation Power system harmonics

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Modeling Issues in Three-Phase Current Source Rectifiers that use Damping Resistors

Modeling Issues in Three-Phase Current Source Rectifiers tha...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Pedro E. Melin Jose R. Espinoza Navid R. Zargari Miguel A. Sanchez Johan I. Guzman Department of Electrical Engineering Concepcion University Concepcion Chile Rockwell Automation Canada Control System Cambridge ONT Canada

The model of a three-phase current source rectifier (CSR) is a complex mathematical representation as it is nonlinear, multi-variable, and coupled. In order to work with a simplified but still accurate model, a representation in a rotating reference frame dq0 in combination with an average model are normally used. The result is a model that operates with ripple free inputs, outputs, and state variables that should be the accurate average value of the actual variables. However, the average model of these topologies could lead to errors if damping resistors are used. A case study shows as much as 10% error in the DC link current between the actual value and the predicted by the average model. This paper finds and shows systematically the source of the error and proposes a method for the accurate average modeling of CSRs with damping resistors. Simulated results show the validity of the theoretical considerations

关键词： Rectifiers Damping Resistors Mathematical model Power harmonic filters Power system modeling Voltage Topology Pulse width modulation Resonant frequency

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Power Losses for IGCTs and Diodes in MV Three-level Inverters

Power Losses for IGCTs and Diodes in MV Three-level Inverter...

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International Conference on Power Electronics and Drive systems (PEDS)

作者： Yuan Liqiang Zhao Zhengming Yang Zhi Department of Electrical Engineering State Key Lab of Control and Simulation of Power System Tsinghua University Beijing China Department of Frequency-converter and Control System GuoDian NanJing Automation Company Limited Nanjing China

The power-loss models for different switching states of IGCTs and diodes in MV (medium voltage) three-level NPC (neutral point clamped) inverters are presented in this paper. The models, simulation implementation and the revisional experiments on IGCT test platform are described in details. The relation between the power losses and the other elements of the inverter is analyzed and discussed.

关键词： Diodes Switches Pulse width modulation inverters Power system modeling Medium voltage Variable speed drives Circuits Cooling Pulse width modulation Snubbers

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Investigation of Transient Performance of Capacitor Voltage Transformer

Investigation of Transient Performance of Capacitor Voltage ...

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National Proceedings Power and Energy Conference (PECon)

作者： Ab. Halim Abdul Bakar Cheng Hock Lim Saad Mekhilef Protection Department Transmission Division TNB Electrical Energy & Power System Universiti Malaya Malaysia Lecturer Department of Electrical Engineering University of Malaya deputy director Center for Research Power Electronics & Drives Automation and Control.

This paper reports the digital-time domain and frequency domain studies on a typical 132 kV capacitor voltage transformer (CVT) model. The transient studies are conducted using alternative transient program (ATP-EMTP). Simulation results corresponding to the CVT transient response under both system fault and ferroresonance condition are reported in this paper. Transient studies are performed (1) to identify the CVT components that contribute to the transient response of CVT, (2) to determine system condition that affect the CVT transient response. A lightning simulation case study is also presented.

关键词： Capacitors Voltage transformers Power system transients Switches Ferroresonance Lightning Circuits Power system modeling Transient response Power system reliability

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Nonlinear system Identification Based on B-Spline Neural Network and Modified Particle Swarm Optimization

Nonlinear System Identification Based on B-Spline Neural Net...

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International Joint Conference on Neural Networks (IJCNN)

作者： L. dos Santos Coelho R.A. Krohling Production and Systems Engineering Graduate Program Automation and Systems Laboratory PPGEPS/CCET/PUCPR Pontifical Catholic University of Paraná Parana Brazil Chair for Control Systems Engineering RST Faculty of Electrical Engineering and Information Technology University of Dortmund Dortmund Germany

Artificial neural networks, in particular, feedforward multilayer networks and basis function networks, have gradually established themselves as a usual tool in approximating complex nonlinear systems. B-spline networks, a type of basis function neural network, are normally trained by gradient-based methods, which may fall into local minima during the learning phase. In order to overcome the drawbacks encountered by conventional learning methods, particle swarm optimization - a swarm intelligence methodology - can provide a stochastic global search of B-spline networks for nonlinear system identification. In this paper, a modified particle swarm optimization algorithm using Gaussian and Cauchy probability distributions are applied to adjust the control points of B-spline neural networks. Simulation results for the identification of Rossler systems are provided and demonstrate the effectiveness and robustness of the proposed identification scheme.

关键词： Nonlinear systems Spline Neural networks Particle swarm optimization Artificial neural networks Multi-layer neural network Learning systems Stochastic systems Probability distribution Robustness

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