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International Universities Power engineering Conference (UPEC)

作者： Kun Liu Xinzhou Dong Zhiqian Bo State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China AREVA T&D Automation슠and Information Systems Staffordshire UK

Non Conventional Instrument Transformer (NCIT) and IEC 61850 are crucial technologies in digital substations. But they bring some new uncertainties to protection IEDs, especially the time synchronization issue in current differential protection. The paper analyzes the time delay of transferring sampled values from NCIT to current differential relay in NCIT and IEC61850 based digital substation, then finds out the delay-non-deterministic problem, at last presents a novel current differential protection scheme by using Phase-Locked Loops (PLL ) technology.

关键词： Substations Delay effects Synchronization IEC Phase locked loops Data communication Ethernet networks

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Output feedback control of linear systems with input and output quantization

Output feedback control of linear systems with input and out...

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IEEE Conference on Decision and control

作者： Daniel Coutinho Minyue Fu Carlos E. de Souza Group of Automation and Control Systems Faculty of Engineering Pontifícia Universidade Católica do Rio Grande do Sul Porto Alegre Brazil School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW Australia Department of Systems and Control Laboratory Nacional de Computação Científica Petropolis Rio de Janeiro Brazil

ISBN: (纸本)9781424431236

A considerable amount of research has been done on the use of logarithmic quantizers for networked feedback control systems. However, most results are developed for the case of a single quantizer (either measurement or control signal quantization). In this paper, we investigate the case of simultaneous input and output quantization for SISO linear output feedback systems. Firstly, we show that the problem of quadratic stabilization via quantized feedback can be addressed with no conservativeness by means of the sector bound approach. Secondly, we provide a bound on the maximal admissible sector bound via a scaled H ¿ optimization problem.

关键词： Output feedback Linear feedback control systems control systems Linear systems Quantization Communication system control Feedback control Communication channels Digital control Bandwidth

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Conditional probability of Cauchy distribution in automatic sleep stage determination for sleep data with artifacts

Conditional probability of Cauchy distribution in automatic ...

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International Conference on control, automation and systems ( ICCAS)

作者： Bei Wang Takenao Sugi Fusae Kawana Xingyu Wang Masatoshi Nakamura Department of Automation East China University of Science and Technology Shanghai China Department of Advanced Systems Control Engineering Saga University Saga Japan Department of Electrical and Electronic Engineering Saga University Saga Japan Department of Clinical Physiology Toranomon Hospital Tokyo Japan

An automatic sleep stage determination system dealing with the sleep data contaminated by artifacts is developed, which is working on an expert knowledge-based multi-valued decision making method. The knowledge database is consisted of probability density functions of parameters for various sleep stages according to the visual inspection by a qualified clinician. The probability density functions are approximated by Cauchy distribution on histograms. Sleep stages are determined automatically according to the maximum value of conditional probability. Due to the infinite variance of Cauchy distribution, the effect of mis-determination caused by artifacts can be abated. The result of automatic sleep stage determination was satisfactory. The presented automatic sleep stage determination can be an assistant tool for clinical practice.

关键词： Sleep Hospitals Decision making Probability density function Inspection Electroencephalography automation Physiology Visual databases Pollution measurement

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Robust control of a High Precision 4-DOF Parallel Manipulator

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IFAC Proceedings Volumes 2008年第2期41卷 15708-15713页

作者： Jacob W.F. Cheung Y.S. Hung Motion Control and Systems Laboratory Research and Development Department ASM Assembly Automation Ltd. 3/F Watson Centre 16 Kung Yip Street Kwai Chung New Territories Hong Kong Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong

A model-based robust control design approach is considered for a novel direct-drive 4-DOF parallel manipulator aimed at high speed and high precision semiconductor packaging applications. An experimental identification method is proposed to determine the dynamic model of the manipulator and a robust feedback controller is designed in the frequency-domain using genetic algorithm. Experimental results demonstrate that the motion performance of the 4-DOF parallel manipulator including positioning accuracy and steady-state error is improved significantly when compared with traditional XY, Z and θ motion stages. This shows that the proposed 4-DOF parallel manipulator provides a superior alternative to the traditional motion stages for high-precision motion.

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A Novel Multi-Level Converter based on Current Source Power Cell

A Novel Multi-Level Converter based on Current Source Power ...

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39th IEEE Power Electronics Specialists Conference (PESC 2008), vol.5

作者： Pedro E. Melin Jose R. Espinoza Navid R. Zargari Luis A. Moran Johan I. Guzman Department of Electrical Engineering Concepción University Concepcion Chile Control Systems Rockwell Automation Cambridge Canada

A novel N-level converter based on current-source power cells that is suitable for medium to high-voltage power applications is proposed. The topology is mainly the dual of the conventional topology based on voltage-source power cells. As such, it inherits all the advantages of the standard topology. But more importantly, the second current harmonic injected back by the normal operation of the single-phase current-source inverters are naturally cancelled out at the DC side of the power cells. This feature is assured by sharing the same magnetic circuit among the inverters connected to different load phases. As a result, the DC link filter required by the operation of the cell needs to be designed just to filter out the switching harmonics. Differently to voltage-source power cells based N-level converters, this ensures a small filter size, an important feature for medium to high power applications. Moreover, standard modulating techniques can be used such as SPWM, space vector, and Selective Harmonic Elimination without any penalties on the aforementioned advantages. Preliminary results confirm the theoretical considerations.

关键词： Reactive power Voltage control

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Study of Non-Conventional Instrument Transformer and IEC61850 impact on current differential protection

Study of Non-Conventional Instrument Transformer and IEC6185...

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： K. L. S. Shenxing X. Dong Z. Bo State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Tsinghua University Beijing Beijing CN State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China AREVA T&D Automation슠and Information Systems Stafford UK

Non conventional instrument transformer (NCIT) and IEC 61850 are crucial technologies in digital substations. But they bring some new uncertainties to protection IEDs, especially the time synchronization issue in current differential protection. The paper analyzes the time delay of transferring sampled values from NCIT to current differential relay in NCIT and IEC61850 based digital substation, then finds out the delay-non-deterministic problem, at last presents a novel current differential protection scheme by using phase-locked loops (PLL ) technology.

关键词： Substations Delay effects Ethernet networks Phase locked loops IEC Synchronization Data communication

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HYBRID PREDICTIVE control OF A SOLAR AIR CONDITIONING PLANT

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IFAC Proceedings Volumes 2008年第2期41卷 952-957页

作者： M. Rodríguez C. De Prada F. Capraro S. Cristea R. De Keyser Department of Systems Engineering and Automatic Control University of Valladolid Valladolid Spain (Tel:+34 983 423162 Instituto de Automática Facultad de Ingeniería Universidad Nacional de San Juan San Juan Argentina (Tel: :+54 0264 4213303 EeSA-department of Electrical energy Systems & Automation Technologiepark. Ghent University Gent Belgium (Tel: +329264 5585

This paper presents a hybrid controller for a solar air conditioning plant, located at the University of Seville, Spain, and used as a benchmark for the HYCON NoE of the EU. The plant uses two sources of energy: solar and gas, plus a set of accumulation tanks and an absorption tower to provide conditioned air to an university building. The hybrid control is based on a model predictive control strategy developed with the objective of operating the air conditioning system using the smaller amount of energy from gas. A novel approach incorporating an internal model with embedded logic control is used to transform the hybrid problem in a continuous-nonlinear one. Simulation results are presented, showing promising results.

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IEEE Transactions on Haptics: Editorial

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IEEE Transactions on Haptics 2008年第1期1卷 2-8页

作者： Edward Colgate, J. Lederman, Susan Prattichizzo, Domenico Barbagli, Federico Basdogan, Cagatay Buss, Martin Ernst, Marc Frisoli, Antonio Gillespie, Brent Grant, Danny Harders, Matthias Hayward, Vincent Jones, Lynette Kajimoto, Hiroyuki Kappers, Astrid Kheddar, Abderrahmane Lin, Ming C. MacLean, Karon Miller, Brian Noma, Haruo Okamura, Allison M. O'Malley, Mareia Ryu, Jeha Tan, Hong Z. Yokokohji, Yasuyoshi Department of Psychology School of Computing Queen's University Canada IEEE Robotics and Automation Society Tübingen Germany Stanford University's Computer Science Department Tübingen Germany Institute of Automatic Control Engineering Technische Universität München Germany Independent Research Group Multisensory Perception and Action Max Planck Institute for Biological Cybernetics Tübingen Germany Department of Applied Mechanics SSSA Japan Research Division Virtual Reality and Telerobotic Systems PERCRO Laboratory Japan Department of Mechanical Engineering Japan Department of Robotics McGill University Canada Computer Vision Lab ETH Zurich Japan Virtual Reality in Medicine Group Japan IEEE CS/RAS Technical Committee on Haptics Japan Department of Electrical and Computer Engineering McGill University Canada Department of Mechanical Engineering MIT Japan University of Electro-Communications Japan Department of Physics and Astronomy Utrecht University Netherlands University of Evry France Chapel Hill United States Department of Computer Science University of British Columbia Canada ATR Knowledge Science Lab United Kingdom Department of Mechanical Engineering Denmark Johns Hopkins University United States Laboratory for Computational Sensing and Robotics United Kingdom Engineering Research Center for Computer-Integrated Surgical Systems and Technology United States Mechanical Engineering and Materials Science Department Rice University United States Korea Republic of Department of Electrical and Computer Engineering Mechanical Engineering and Psychological Sciences Purdue University United States Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Japan

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Improvement of the crown and shape control model for the hot rolling

SEAISI Quarterly (South East Asia Iron and Steel Institute)

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SEAISI Quarterly (South East Asia Iron and Steel Institute) 2008年第3期37卷 38-43页

作者： Hayashi, Kanji Omura, Akihiro Furumoto, Hideaki Kanemori, Shinya Guobin, Ding Research and Developing Office Mitsubishi-Hitachi Metals Machinery Inc. Hiroshima Japan Electrical and Automation Engineering Group Mitsubishi-Hitachi Metals Machinery Inc. Hiroshima Japan Materials and Manufacturing Technology Laboratory Mitsubishi Heavy Industries Ltd. Hiroshima Japan Control Systems Laboratory Mitsubishi Heavy Industries Ltd. Hiroshima Japan Cold Rolling Mill Stainless Steel Branch Baoshan Iron and Steel Co. Ltd. Shanghai China

It has long been recognized that the crown and shape of hot-rolled strips are Important in terms not only of product quality but also of good yield and operational stability in production. The controlling of the thickness distribution along the width direction, so called "the strip crown", is essential for the requirements. To meet the requirements, the pair cross mills and crown-control model have been developed. Recently, the requirements for closer and closer tolerance on the crown and flatness of hot-rolled strips have been increasing especially for the region at the strip edges along the width direction. And so, the crown-control model has been improved which is taking into account the width spread at the strip edges and based on Rigid-Plastic FEM and Neural-Network method. This advanced model for the controlling the crown and shape is applied to the production mill, and the measured strip crown agreed well with the predicted one.

关键词： Hot rolling

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Impedance fault location algorithm for UHV long transmission lines with single-line-to-ground faults

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Dianli Xitong Zidonghua/automation of Electric Power systems 2008年第14期32卷 25-29页

作者： Wang, Bin Dong, Xinzhou Bo, Zhiqian Klimek, Andrew State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China AREVA T and D Automation Co. Stafford ST17 4LX United Kingdom

Ultra-high-voltage (UHV) transmission lines (over 750 kV) normally have larger shunt capacitance and longer transmission radius, which impose limitations of direct application of traditional impedance algorithm. A novel impedance fault location algorithm is proposed for UHV transmission lines with single-line-to-ground faults due to higher voltage level than 750 kV. It is based on the precondition that the negative sequence current phase at meter location can precisely describe the phase information of negative current in fault path or fault voltage. The algorithm is immune to the influence of shunt capacitance with distributed parameters modeling for transmission line, and is not disturbed by fault resistance with fault location calculation at zero-crossing point of voltage at fault point. Theoretical analysis and simulation prove that the proposed method can guarantee good fault location accuracy, and fulfill the requirements in the field.

关键词： Electric lines

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