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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Hong, Li Hao, Xiong Weiguo, Li Yi, Sun Guoyi, Xu IEEE North China Electric Power University Wuhan University Beijing Institute North China Electrical Power University Electrical Engineering School North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control

ISBN: (纸本)9787900714138

Based on nonparametric conditional heteroscedasticity estimation theory, an improved power price forecasting method is proposed in this paper. In this method, according to the practical power price curve, conditional variance function is built and the model is determined by nonparametric estimation method. Besides, in the nonparametric estimation process, the iterative estimation algorithm is introduced to deal with the problem where conditional standard deviation is unpredictable. And the estimation credence of conditional variance function is improved by continually modifying the estimation value of conditional standard deviation as input variance. On the research of day-ahead time series fluctuation characteristics of power price in California in 2000, the time series of Humb node is modeled and forecasted. And the test results show that the model proposed in this paper can better reflect time series volatility clustering characteristics of power price, and it can improve forecasting effect of peak power price by using nonparametric estimation theory. © 2008 DRPT.

关键词： Time series

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Stabilizability of Networked control systems via Packet-loss Dependent Output Feedback controllers

Stabilizability of Networked Control Systems via Packet-loss...

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2008 American control Conference (ACC), vol.9

作者： Junyan Yu Long Wang Mei Yu Yingmin Jia Jie Chen Intelligent Control Laboratory Center for Systems and Control College of Engineering Peking University Beijing China Department of Automation North China Electric Power University Beijing China Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing Institute of Technology Beijing China

We consider the output feedback stabilizability of networked control systems with bounded packet loss. A packet-loss dependent Lyapunov function is adopted to design packet-loss dependent stabilizing output feedback controllers by resolving some linear matrix inequalities. Moreover, two types of packet-loss processes are discussed: one is the arbitrary packet-loss process, and the other is the Markovian packet-loss process. A numerical example and some simulations are worked out to demonstrate the effectiveness of the proposed design technique.

关键词： Networked control systems Output feedback control systems Switched systems State feedback Lyapunov method Linear matrix inequalities Electrical equipment industry Industrial control Sufficient conditions

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Packet-loss dependent controller design for networked control systems via switched system approach

Packet-loss dependent controller design for networked contro...

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IEEE Conference on Decision and control

作者： Junyan Yu Long Wang Mei Yu Yingmin Jia Jie Chen Intelligent Control Laboratory Center for Systems and Control College of Engineering Peking University Beijing China Department of Automation North China Electric Power University Zhuxinzhuang Beijing China The Seventh Research Division Beihang University Beijing China Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing China

ISBN: (纸本)9781424431236

The stabilization problem of networked control systems with bounded packet loss is addressed. We model such networked control systems as a class of switched systems, and present sufficient conditions for the stabilization by using a packet-loss dependent Lyapunov function. Moreover, different from existing results, we propose the design for packet-loss dependent stabilizing controllers for two types of packet-loss processes: one is a arbitrary packet-loss process, and the other is a Markovian packet-loss process. Several numerical examples and simulations are worked out to demonstrate the effectiveness of the proposed design technique.

关键词： control systems Networked control systems Switched systems Sufficient conditions Optimal control Delay effects Communication system control Communication system traffic control Feedback control Electrical equipment industry

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International Collaboration in Synchronized Measurement Experiment in Russia

International Collaboration in Synchronized Measurement Expe...

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power systems Conference on Advanced Metering, Protection, control, Communication and Distributed Resources

作者： Grobovoy, Andrey Bondareva, Natalia Stepanov, Vladimir Atienza, Edsel Power System Emergency Control Laboratory Ltd Siberian Electric Power Research Institute Russian Federation ABB Automation Schweitzer Engineering Laboratories Inc. United States

ISBN: (纸本)9781424408542

The paper discusses the results of the synchronized measurement experiment recently conducted in the Russian Far East Interconnected power system. An international team of experts conducted a set of unique tests in the bulk power system. The tests used five devices for synchronized phasor measurement. In conjunction with digital fault recorders (DFRs), the phasor measurement units (PMUs) were able to demonstrate the feasibility of using PMUs to monitor and control the Russian Far East Interconnected power system.

关键词： Phasor measurement units

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A Novel Method Of controller Design For Simultaneous Stabilization And Performance Improvement Of An Electromagnetic Levitation system

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Asian Journal of control 2008年第4期9卷

作者： Subrata Banerjee T. K. Sunil Kumar Jayanta Pal Dinkar Prasad Department of Electrical Engineering Indian Institute of Technology Kharagpur India. T.K.Sunil Kumar:was born in 1974 at Calicut India. He received the B.Tech in electrical engineering in 1997 from N.S.S College of Engineering Palakkad (Calicut University) and M.Tech in Power System in 2001 from Regional Institute of Technology Jamshedpur (Ranchi University). Since 2001 he has been pursuing research work for his Ph.D in Electrical Engineering at Indian Institute of Technology Kharagpur. He is a life member of Systems Society of India. His main research interests includes application of control theory and computers to power system model order reduction genetic algorithm PID tuning random search optimization controller deign in 2-DOF configuration and interval systems. Emerson Network Power India.

This paper describes design and implementation of a control philosophy for simultaneous stabilization and performance improvement of an electromagnetic levitation system. An electromagnetic levitation system is an inherently unstable and strongly nonlinear system. To determine the overall closed loop stability for such a system, cascade lead-lag compensation has mostly been reported [1,2]. However, a single lead controller can not satisfy both stability and performance for such unstable systems [3]. Performance enhancement to satisfy the conflicting requirements of fast response with almost zero overshoot and zero steady state error has been successfully achieved by using a two loop controller configuration. The lead controller in the inner loop is designed to ensure stability while the outer loop PI controller is designed for performance enhancement. This approach decouples the twin requirements of stabilization (by the inner loop) and performance achievement (by the outer PI loop). The outermost PI controller has been designed using the ‘Approximate Model Matching’ technique [4]. The proposed control strategy has been implemented and the experimentation has been demonstrated successfully. Different experimental results have been included for verification.

关键词： Electromagnetic levitation lead-lag compensation approximate model matching control switched-mode DC to DC chopper model order reduction technique.

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A new topology for photovoltaic 4 series DC/DC converter with high efficiency under wide load range

A new topology for photovoltaic 4 series DC/DC converter wit...

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7th Internatonal Conference on power Electronics, ICPE'07

作者： Lee, Jong Pil Min, Byung Duk Kim, Jeong Joong Ryul, Kang Yul Kim, Tae Jin Yoo, Dong Wook Song, Eui Ho Yoo, Ji N Power Conversion and System for RES Group Korea Electrotechnology Research Institute Changwon 641 -600 Korea Republic of School of Mechatronics Control and Instrumentation Engineering Changwon University Korea Republic of School of Electrical Engineering Korea University Korea Republic of

ISBN: (纸本)9781424418725

The paper proposes a new topology for photovoltaic dc/dc converter with high efficiency under wide input voltage range is proposed. Photovoltaic dc/dc is a very crucial part of power conditioning system(PCS). Considering that output characteristic of photovoltaic cell has wide voltage range, depending on the operating conditions of photovoltaic cell, the dc/dc converter also needs to have wide input voltage range to regulate the constant output voltage. In addition, a high rated voltage of power switch(MOSFET) for dc/dc converter is necessary in order to be compatible with the high maximum output voltage of photovoltaic cell's maximum output voltage. Also photovoltaic power conditioning system should have a high efficiency under operation condition. To satisfy PV PCS condition series connected non-isolated dc/dc converter topology is proposed. This paper examines the proposed topology employing four modules and shows that it dramatically enhances the energy efficiency from low load to high load condition by reducing the required power level for dc/dc converter by one-third of conventional dc/dc converter. A case of 25kW prototype as the PV dc/dc converter is introduced to experimentally verify the proposed topology. © 2008 IEEE.

关键词： Topology

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International collaboration in synchronized measurement experiment in Russia

International collaboration in synchronized measurement expe...

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power systems Conference: Advanced Metering, Protection, control, Communication, and Distributed Resources, PSC

作者： Andrey Grobovoy Natalia Bondareva Vladimir Stepanov Edsel Atienza Power System Emergency Control Laboratory Limited Siberian Electric Power Research Institute Serbia ABB Automation Switzerland Schweitzer Engineering Laboratories Inc. USA

关键词： International collaboration power system interconnection power system faults power system measurements Phasor measurement units power measurement system testing Monitoring control systems power system control

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Switched reluctance motor and its mathematical model

Switched reluctance motor and its mathematical model

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5th International Conference-Workshop Compatibility in power Electronics, CPE 2007

作者： Tkachuk, Vasyl Klytta, Marius Institute of Power Engineering and Control System National University Lvivska Polytechnica Department of Electrical Machines and Devices 12'St.Bandery str. 79013 Lviv Ukraine Department of Electrotechnic and Information - Technic University of Applied Sciences Giessen - Friedberg Wiesenstrasse 14 35390 Giessen Germany

The constructive schemes of switched reluctance motor and basic electrical scheme of a commutator with capacity buffers of energy are circumscribed, A mathematical model to a research of electromechanical processes in... 详细信息

ISBN: (纸本)142441055X

关键词： Electric drives

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Switched Reluctance Motor and its Mathematical Model

Switched Reluctance Motor and its Mathematical Model

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Compatibility in power Electronics (CPE)

作者： Vasyl Tkachuk Marius Klytta Institute of Power Engineering and Control System Chair of Electrical Machines and Devices National University Lvivska Politechnika Lviv Ukraine Department of Electrotechnic and Information-Technic University of Applied Sciences Giessen-Friedberg Giessen Germany

The constructive schemes of switched reluctance motor and basic electrical scheme of a commutator with capacity buffers of energy are circumscribed. A mathematical model to a research of electromechanical processes in... 详细信息

关键词： Reluctance motors Mathematical model Commutation Electromagnetic compatibility Magnetic flux Reluctance machines Stator cores Teeth Magnetic separation Stator windings

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Dynamic Event Analysis using Synchronized PMUs via 220V Wall Outlets

Dynamic Event Analysis using Synchronized PMUs via 220V Wall...

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2007 International power engineering Conference (IPEC2007), vol.2

作者： Issarachai Ngamroo Panlert Lappanakul Nitus Voraphonpiput Sanchai Dechanupaprittha Yasunori Mitani Jareerat Sakulrat Department of Electrical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Power System Analysis Department Control and Protection Electricity Generating Authority of Thailand Thailand Department of Electrical Engineering Kyushu Institute of Technology Fukuoka Japan Department of Civil Engineering Prince of Songkla University Songkla Thailand

This paper presents the dynamic analysis results of a system event in Thailand power network using a wide-area monitoring system based on synchronized phasor measurement units (PMUs). The salient feature of the proposed monitoring system is the convenient installation of PMU at 220V wall power outlets. The event considering here is a 80MW load transferring from Thailand to Malaysia systems through a weak 115kV tie-line. To perform load transferring, a synchronization between both systems is required. This causes a problem of frequency osculation in a southern area of Thailand. Besides, this event severely excites the inter-area oscillation in a 230kV tie-line between central and southern areas of Thailand. Analyzed results based on discrete wavelet decomposition and short-time Fourier Transform provide valuable information of the system dynamic behavior in both frequency and time domains.

关键词： Synchronized Phasor measurement units Wide-area monitoring Inter-area oscillation Discrete wavelet decomposition Least-squares regression Short-time Fourier Transform

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