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Cancellation predictive control for three-phase PWM rectifiers under harmonic and unbalanced input conditions

Cancellation predictive control for three-phase PWM rectifie...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Xiao, Peng Corzine, Keith A. Venayagamoorthy, Ganesh K. Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri-Rolla MO 65409 United States

ISBN: (纸本)1424401364

This paper presents an intuitive and simple-to-implement control scheme to improve the performance of three-phase boost-type PWM rectifiers under harmonic and unbalanced input conditions. Unlike most other control strategies, the proposed method does not need to extract either the harmonic or the negative-sequence components in the supply voltages and currents. A near-synchronous reference frame is used to determine the positive-sequence fundamental-frequency component in the input voltages. Utilizing only the extracted component, the dc-link voltage control and power factor control are implemented independently to determine the phase angle and magnitude of the PWM reference voltage. The commanded rectifier voltage adjustments are superimposed upon the grid voltages in such a way that the distortions (both harmonic and negative sequence components) are effectively cancelled. By employing a near-synchronous reference frame, no line-synchronization algorithm or hardware PLL is needed, so very little computational effort is required for its implementation. Simulation results show that the proposed method performs very well under extreme harmonic and unbalanced conditions such as when one or even two phases of the grid voltages are zero. In order to further verify its effectiveness, a laboratory hardware platform has been developed. © 2006 IEEE.

关键词： Pulse width modulation

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Detecting incorrect intentions of trainees by context deviations

Detecting incorrect intentions of trainees by context deviat...

引用

15th Conference on Behavior Representation in Modeling and Simulation 2006

作者： Fernlund, Hans Gonzalez, Avelino J. Ekblad, Joakim Intelligent Systems Laboratory School of Electrical Engineering and Computer Science University of Central Florida Orlando FL 32816-2450 United States

ISBN: (纸本)9781604238969

Conducting After Action Reviews that provides feedback to the majority of the participants in large exercises, with trainees that may reside in different locations can be very complicated. This process requires extensive time and resources, and the review might be limited to the few most important tactical decisions made. However, the evaluation of an exercise is highly important to improve performance of the trainees. This paper presents the latest results in research to automate the After Action Review. Here we present how the intent of a trainee might deviate from the desirable intent and be detected in any training scenario. The technique is to use an expert modeling paradigm based on contexts together with a deviation detection mechanism that can infer the context of the trainee in order to detect discrepancies between him and the expert model. Furthermore, the model is automatically created by observing real human performance. Preliminary results of this approach are described.

关键词： Behavioral research

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A novel seven-level shunt active filter for high-power drive systems

A novel seven-level shunt active filter for high-power drive...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

ISBN: (纸本)1424401364

In high-power adjustable speed motor drives, such as those used in electric ship propulsion systems, active filters provide a viable solution to mitigating harmonic related issues caused by diode or thyristor rectifier front-ends. To handle the large compensation currents and provide better thermal management, two or more paralleled semiconductor switching devices are often used. In this paper, a novel topology is proposed where two active filter inverters are connected with tapped reactors to share the compensation currents. The proposed active filter topology can also produce seven voltage levels, which significantly reduces the switching current ripple and the size of ripple filters. Based on the joint redundant state selection strategy, a current-balancing algorithm is proposed to keep the reactor magnetizing current to a minimum. It is shown through simulation that the proposed active filter can achieve high overall system performance. The system is also implemented on a real-time digital simulator to further verify its effectiveness. © 2006 IEEE.

关键词： Bandpass filters

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A study of particle swarm optimization in gene regulatory networks inference

A study of particle swarm optimization in gene regulatory ne...

引用

3rd International Symposium on Neural Networks, ISNN 2006 - Advances in Neural Networks

作者： Xu, Rui Venayagamoorthy, Ganesh Wunsch II, Donald C. Applied Computational Intelligence Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO 65409 United States Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO 65409 United States

ISBN: (纸本)3540344829

Gene regulatory inference from time series gene expression data, generated from DNA microarray, has become increasingly important in investigating genes functions and unveiling fundamental cellular processes. Computational methods in machine learning and neural networks play an active role in analyzing the obtained data. Here, we investigate the performance of particle swarm optimization (PSO) on the reconstruction of gene networks, which is modeled with recurrent neural networks (RNN). The experimental results on a synthetic data set are presented to show the parameter effects of PSO on RNN training and the effectiveness of the proposed method in revealing the gene relations. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Genetic engineering

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Optimal STATCOM sizing and placement using particle swarn optimization

Optimal STATCOM sizing and placement using particle swarn op...

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2006 IEEE PES Transmission and Distribution Conference and Exposition: Latin America, TDC'06

作者： Del Valle, Y. Hernandez, J.C. Venayagamoorthy, G.K. Harley, R.G. Department of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO 65409 United States

ISBN: (纸本)1424402883

Heuristic approaches are traditionally applied to find the size and location of Flexible AC Transmission systems (FACTS) devices in a small power system. Nevertheless, more sophisticated methods are required for placing them in a large power network. Recently, the Particle Swarm Optimization (PSO) technique has been applied to solve power engineering optimization problems giving better results than classical methods. This paper shows the application of PSO for optimal sizing and allocation of a Static Compensator (STATCOM) in a power system. A 45 bus system (part of the Brazilian power network) is used as an example to illustrate the technique. Results show that the PSO is able to find the best solution with statistical significance and a high degree of convergence. A Detailed description of the method, results and conclusions are also presented. © 2006 IEEE.

关键词： Flexible AC transmission systems

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Real-time implementation of a STATCOM on a wind farm equipped with doubly fed induction generators

Real-time implementation of a STATCOM on a wind farm equippe...

引用

2006 IEEE Industry Applications Conference - Forty-First IAS Annual Meeting

作者： Wei, Qiao Venayagamoorthy, Ganesh K. Harley, Ronald G. Intelligent Power Infrastructure Consortium School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri-Rolla Rolla MO 65409-0249 United States

ISBN: (纸本)1424403642

Voltage stability is a key issue to achieve the uninterrupted operation of wind farms equipped with doubly fed induction generators (DFIGs) during grid faults. A Static Synchronous Compensator (STATCOM) is applied to a power network which includes a DFIG driven by a wind turbine, for steady state voltage regulation and transient voltage stability support. The control schemes of the DFIG rotor-side converter, grid-side converter and the STATCOM are suitably designed and coordinated. The system is implemented in real-time on a RealTime Digital Simulator (RTDS®). Results show that the STATCOM improves the transient voltage stability and therefore helps the wind turbine generator system to remain in service during grid faults. © 2006 IEEE.

关键词： Wind turbines

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Fault diagnosis with dynamic fuzzy discrete event system approach

引用

14th Turkish Symposium on Artificial Intelligence and Neural Networks, TAINN 2005

作者： Kiliç, Erdal Karasu, Çaǧlar Leblebicioǧlu, Kemal Middle East Technical University Electrical and Electronic Engineering Department Computer Vision and Intelligent Systems Laboratory 006531 Ankara Turkey Tübitak Sage 06531 Ankara Turkey

ISBN: (纸本)3540367136

Determining faults is a challenging task in complex systems. A discrete event system (DES) or a fuzzy discrete event system (FDES) approach with a fuzzy rule-base may resolve the ambiguity in a fault diagnosis problem especially in the case of multiple faults. In this study, an FDES approach with a fuzzy rule-base is used as a means of indicating the degree and priority of faults, especially in the case of multiple faults. The fuzzy rule-base is constructed using event-fault relations. Fuzzy events occurring any time with different membership degrees are obtained using k-means clustering algorithm. The fuzzy sub-event sequences are used to construct super events. The study is concluded by giving some examples about the distinguishability of fault types (parameter, actuator) in an unmanned small helicopter. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Fault tolerant computer systems

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Design and control of a four steered wheeled mobile robot

Design and control of a four steered wheeled mobile robot

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IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Lauria, Michel Nadeau, Isabelle Lepage, Pierre Morin, Yan Giguère, Patrick Gagnon, Fréderic Létourneau, Dominic Michaud, François Department of Electrical Engineering and Computer Engineering Research Laboratory on Mobile Robotics and Intelligent Systems Université de Sherbrooke Sherbrooke QC J1K 2R1 Canada

ISBN: (纸本)1424401364

This paper presents the kinematical analysis of AZIMUT-2, a four steered wheeled mobile robot. The utilization of a new wheel concept called the AZIMUT wheel allowed us to create an innovative omnidirectional non-holonomic robot. Novelty of this wheel concept resides in the non-conventional positioning of the steering axis and the wheel axis. We propose a kinematical model based on the geometrical constraints of these wheels. The degree of mobility, steerability and maneuverability are studied. Additionally, we describe a special design implementation of the wheel mechanism to overcome a hypermotorization issue inherent to the wheel's geometrical properties. Finally, we describe AZIMUT-2's two operational and seven locomotion modes, along with a control algorithm based on the kinematical model of the robot. © 2006 IEEE.

关键词： Wheels

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Optimal design of power system stabilizers using a small population based PSO

Optimal design of power system stabilizers using a small pop...

引用

IEEE General Meeting Power& Energy Society

作者： T.K. Das G.K. Venayagamoorthy Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri MO USA

Power system stabilizers (PSSs) are used to generate supplementary control signals to excitation systems in order to damp out local and inter-area oscillations. In this paper, a modified particle swarm optimization (PSO) algorithm with a small population is presented for the design of optimal PSSs. The small population based PSO (SPPSO) is used to determine the optimal parameters of several PSSs simultaneously in a multi-machine power system. In order to maintain a dynamic search process, the idea of particle regeneration in the population is also proposed. Optimal PSS parameters are determined for the power system subjected to small and large disturbances. The effectiveness of the PSSs parameters determined by the SPPSO algorithm is observed in damping out the power system oscillations fast after a disturbance. The advantage of the proposed approach is its convergence in fewer evaluations and lesser computations are required per evaluation. Results obtained with the SPPSO optimized PSSs parameters are compared against published PSS parameters for the Kundur's two area power system

关键词： Power systems Power system dynamics Power system control Power generation Signal generators Control systems Particle swarm optimization Algorithm design and analysis Damping Convergence

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A Generalized and Automatic Image Contrast Enhancement Using Gray Level Grouping

A Generalized and Automatic Image Contrast Enhancement Using...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Zhi Yu Chen B.R. Abidi D.L. Page M.A. Abidi Electrical and Computer Engineering Department Imaging Robotics and Intelligent Systems Laboratory University of Tennessee Knoxville TN USA

Contrast enhancement has an important role in image processing applications. Conventional contrast enhancement techniques either fail to produce satisfactory results for a broad variety of low-contrast images, or cannot be automatically applied to different images, because their parameters must be specified manually to produce a satisfactory result for a given image. This paper describes a new automatic method for contrast enhancement. The basic procedure is to first group the histogram components of a low-contrast image into the proper number of bins according to a selected criterion, then redistribute these bins uniformly over the grayscale, and finally ungroup the previously grouped gray-levels. Accordingly, this new technique is named gray-level grouping (GLG). GLG not only produces results superior to conventional contrast enhancement techniques, but is also fully automatic in most circumstances, and is applicable to a broad variety of images

关键词： Histograms Gray-scale Background noise intelligent robots Image processing Helium Robotics and automation intelligent systems Laboratories Electronic mail

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