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A novel control method for the compensation voltages in dynamic voltage restorers

A novel control method for the compensation voltages in dyna...

引用

Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Sang-Joon Lee Hyosung Kim Seung-Ki Sul School of Electrical Engineering and Computer Science Seoul National University South Korea Department of Control Engineering Cheonan National Technical College South Korea

This paper discusses the control of the compensation voltages in dynamic voltage restorers (DVR). On analyzing the power circuit of a DVR system, control limitations and control targets are presented for the compensation voltage control. Based on the preceded power stage analysis, a novel controller for the compensation voltages in DVRs is proposed by a feedforward control scheme. This paper also discusses the time delay problems in the control system of DVRs. Digital control systems inevitably have control delay due to its the sampling of signal, the switching frequency of an inverter, and the signal delay due to sensor itself. The total signal delay is considerable in real implementation and it endanger the system stability. This paper analyzes the relationship among the control delay, closed loop damping factor, and the output filter parameters of DVR inverters. Based on the control system analysis, a guideline is proposed to design the appropriate output filter parameters and the inverter switching frequency for DVRs. The proposed theory is verified by an experimental DVR system, which is controlled in full digital manner.

关键词： Voltage control control systems Inverters Power system restoration Digital control Switching frequency Filters Circuit analysis Delay effects Sampling methods

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A calculation for the compensation voltages in dynamic voltage restorers by use of PQR power theory

A calculation for the compensation voltages in dynamic volta...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Hyosung Kim Sang-Joon Lee Seung-Ki Sul Department of Control Engineering Cheonan National Technical College South Korea School of Electrical Engineering and Computer Science Seoul National University South Korea

This paper discusses how to calculate the compensation voltages in dynamic voltage restorers (DVR) by use of PQR power theory. Directly sensed three-phase voltages are transformed to p-q-r coordinates without time delay, then the reference voltages in p-q-r coordinates have very simple form: dc values. The controller in p-q-r coordinates is very simple and clear, has better steady state and dynamic performance than conventional controllers. The controlled variables in p-q-r coordinates are then inversely transformed to the original a-b-c coordinates instantaneously, generating reference compensation voltages to a DVR. The control algorithm can be used for various kinds of series compensators such as dynamic voltage restorers (DVR), series active filters (SAP), synchronous static series compensators (SSSC), and bootstrap variable inductances (BVI). The control algorithm was applied to an experimental DVR system. The experimental results verified the performance of the proposed control algorithm.

关键词： Voltage control control systems Steady-state Circuit faults Delay effects Power system restoration Power quality control engineering Educational institutions computer science

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Camera calibration technique by pan-closeup exposures for industrial vision metrology 20

Camera calibration technique by pan-closeup exposures for in...

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20th ISPRS Congress Technical Commission V

作者： Imoto, Harutaka Hattori, Susumu Akimoto, Keiichi Ohnishi, Yuzo Dept. of Production Technology Development Ishikawajima-Harima Heavy Industries Co. Ltd. Yokohama Japan Dept. of Computer Science Fukuyama University Fukuyama Japan Dept. of Control Engineering Shikoku Polytechnic-College Marugame Japan School of Urban and Environment Engineering Kyoto University Kyoto Japan

A high precision and easy-to-use CCD camera calibration technique for industrial vision metrology is discussed. A well-known method is self-calibration by convergent camera configuration of a two- or three-dimensional target field. Only with this technique the central part of a sensor area is precisely calibrated, but off the centre the precision rapidly deteriorates. The presented technique is a simultaneous adjustment of both pan and close exposures, which compensates the lack of distortion data in the fringe area of the sensor and offers both uniform and high-precision calibration. Some patterns of camera configuration are compared in an experiment in terms of the precision and its uniformity over the sensor. And the combination of convergent pan exposures and vertical close exposures is proved the best. © 2014 ISPRS. All Rights Reserved.

关键词： Calibration

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Telerobotic mini-golf: system design for enhanced teleoperator performance

Telerobotic mini-golf: system design for enhanced teleoperat...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： S.R. Munasinghe Ju-Jang Lee T. Usui M. Nakamura N. Egashira Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Department of Advanced Systems Control Engineering Saga University Saga Japan Department of Control and Information Systems Engineering Kurume National College of Technology Fukuoka Japan

This paper discusses the safety assurance, capability features, and user-friendliness of Internet-based telerobotics, in the sense that how these features could be incorporated in order to enhance teleoperator performance. A comprehensive set of safety features are incorporated to the interface to screen and accept only the safe commands from the remote operator while discarding risky commands. A laser pointer is used to help remote operator in perceiving self-location and navigation, whereas orientation control has been completely automated and synchronized to the position commands of the teleoperator. The effectiveness of these features has been demonstrated by playing telerobotic mini-golf.

关键词： Telerobotics Teleoperators Internet Paper technology control systems Safety Supervisory control Power system modeling System testing computer science

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A PWM strategy for four-leg voltage source converters and applications to a novel line interactive UPS in a three-phase four-wire system

A PWM strategy for four-leg voltage source converters and ap...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Jang-Hwan Kim Seung-Ki Sul Hyosung Kim Jun-Keun Ji School of Electrical Engineering and Computer Science Seoul National University South Korea Department of Control Engineering Cheonan National Technical College South Korea Division of Information Technology Engineering Soonchunhyang University South Korea

ISBN: (纸本)0780384865

A four-leg pulse width modulation (PWM) voltage source converter (VSC) is used to supply three phase balanced voltage even under an unbalanced load condition in three phase four wire power distribution network. A novel carrier-based modulation technique for the converter is described with the concept of an offset voltage and also is extended to so called 'discontinuous PWM (DPWM)' to minimize switching losses of VSC. As a practical application example of the four-leg VSC, a line interactive uninterruptible power supply (UPS) system is chosen. The feasibility of the proposed PWM strategies and control algorithms has been verified by the simulation and experimental results.

关键词： Pulse width modulation Pulse width modulation converters Voltage Uninterruptible power systems Power conversion Phase modulation Wire Power systems Switching converters Switching loss

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Nonparametric approach to color based image retrieval 12

Nonparametric approach to color based image retrieval

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12th European Signal Processing Conference, EUSIPCO 2004

作者： Smolka, B. Venetsanopoulos, A.N. Lukac, R. Plataniotis, K.N. Silesian University of Technology Department of Automatic Control Akademicka 16 Str Gliwice44-100 Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road TorontoONM5S 3G4 Canada

ISBN: (纸本)9783200001657

The rapid growth of image archives increases the need for efficient and fast tools that can retrieve and search through large amount of visual data. In this paper we propose an efficient method of extracting the image color content, which can serve as an image digital signature, allowing the efficient indexing and retrieval of large Internet-based multimedia databases. We applied the proposed method using the images from two Internet databases containing a collection of images of fine arts and a database of low resolution images, and show that the new method of image color representation is robust to image distorsions caused by resizing and compression and can be incorporated into existing web-based retrieval systems, that exploit the information on color content of digital images. © 2004 EUSIPCO.

关键词： Color

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Nonparametric technique of impulsive noise removal 12

Nonparametric technique of impulsive noise removal

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12th European Signal Processing Conference, EUSIPCO 2004

作者： Smolka, B. Budzan, S. Venetsanopoulos, A.N. Lukac, R. Silesian University of Technology Department of Automatic Control Akademicka 16 Str Gliwice44-100 Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road TorontoONM5S 3G4 Canada

ISBN: (纸本)9783200001657

In this paper a novel class of filters designed for the removal of impulsive noise in color images is presented. The proposed filter class is based on the nonparametric estimation of the density probability function in a sliding filter window. The obtained results show good noise removal capabilities and excellent structure preserving properties of the new impulsive noise removal technique. © 2004 EUSIPCO.

关键词： Impulse noise

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Effectiveness of naked-eye vision feedback for training human teleoperators

Effectiveness of naked-eye vision feedback for training huma...

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Asian control Conference

作者： S.R. Munasinghe Ju-Jang Lee T. Usui M. Nakamura N. Egashira Dept of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Dejean Korea Dept. of Advanced Systems Control Engineering Saga University Saga Japan Dept. of Control and Information Systems Engineering Kurume National College of Technology Kurume-City Fukuoka Japan

Effective training is essential for human teleoperators to deliver satisfactory performance in actual tasks. Teleoperation is naturally a very difficult task due to the absence of naked-eye vision that cripples the cognitive behavior of the remote operator. Camera vision somehow is not a satisfactory substitution. However, training with naked-eye vision feedback may help human teleoperators to learn how to deliver satisfactory performance when they actually interact with camera vision. This study was carried out to further investigate this hypothesis, and to quantitatively supplement it with experimental proofs. For this cause, the recently built telerobotic test-bed between KAIST (Korea) and Saga University(Japan) was reshaped to a telerobotic mini-golf system, which is the trial experiment in this study. The performance of the players with and without naked-eye training was compared and quantitatively evaluated. The effectiveness of training with naked-eye vision was verified as an essential part in training human teleoperators.

关键词： Feedback Humans Teleoperators Telerobotics Cameras Testing Internet Graphics computer science control engineering

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A new control method for the high frequency electronic ballast

A new control method for the high frequency electronic balla...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Won Seok Oh Kyu Min Cho Jin Beom Jeong Hee Jun Kim Department of Electrical Engineering Yuhan-Junior College South Korea Department of Information and Communications Yuhan-Junior College South Korea Department of Electronics Electrical Control and Instrumentation Engineering Hanyang University South Korea Divisionof Electrical and Computer Engineering Hanyang University South Korea

ISBN: (纸本)0780383990

This work presents a new control method for the high frequency electronic ballast, which is operated with half bridge resonant inverter converting raw rectified DC to AC. For the commercial electronic ballast, proper AC input power factor and crest factor of the lamp current are required. The most ballast, therefore, has an active or passive power factor correction (PFC) circuit. With the proposed method, it can be achieved simultaneously that greater than 0.91 of input power factor and less than 1.8 of lamp current crest factor without any PFC circuit. In this paper, the proposed ballast control scheme is described and in order to verify the validity of proposed scheme, the experimental results for the application to the fluorescent lamp are discussed.

关键词： Frequency Electronic ballasts Resonant inverters Bridge circuits Reactive power Communication system control Space technology Power conversion Power system harmonics Costs

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High precision control for linear motor-based container transfer system with cogging force and friction

High precision control for linear motor-based container tran...

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Annual Conference of Industrial Electronics Society

作者： Jin-Woo Lee Jin-ho Suh Young-Jin Lee Kwon-Soon Lee Department of Electrical Engineering Dong-A University South Korea Department of Electrical Instrument of Control Korea Aviation Politechnic College South Korea Department of Electrical Electronics and Computer Engineering Dong-A University South Korea

ISBN: (纸本)0780387309

In this paper, we will introduce concerning a control strategy that is the multi-step prediction control of linear motor-based container transport system for high precision using dynamically-constructed recurrent fuzzy neural networks (DR-FNNs). Linear motor-based container transport system (LMCTS) is horizontal transfer system for the yard automation, which has been proposed to take the place of automated guided vehicle in the maritime container terminal. LMCTS is considered as that the system is changed its model suddenly and variously by loading and unloading container. The proposed control system is used two DR-FNNs for multi-step prediction. Consequently, the system has an ability to adapt for a huge rolling friction, cogging force, force ripple, and sudden changes of itself by loading and unloading.

关键词： Force control control systems Containers Forging Friction Automatic control Fuzzy neural networks Fuzzy control Automation Vehicles

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