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A three-phase to three-phase matrix converter prototype

controle y Automacao 2012年第3期23卷 247-262页

作者： De Oliveira Filho, Milton E. Sguarezi Filho, Alfeu J. Ruppert, Ernesto Mobility Engineering Center Federal University of Santa Catarina - UFSC Joinville-SC Brazil Center of Engineering Modeling and Applied Social Sciences - CECS Federal University of ABC - UFABC Santo André-SP Brazil Department of Systems and Energy Control Electrical and Computer Engineering University of Campinas Campinas-SP Brazil

This paper presents some implementation details of a three-phase to three-phase matrix converter prototype. The bidirectional semiconductor switches were built using discrete IGBTs and fast diodes. Design aspects such as protection against overvoltage and short-circuit, commutation process of bi-directional switches, and input filter are addressed in this paper.

关键词： Matrix converters

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Enhancing the efficiency of photovoltaic solar cells with photonic nanostructures

Enhancing the efficiency of photovoltaic solar cells with ph...

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IEEE Photonics Conference (IPC)

作者： Georgios Veronis Changjun Min Christopher H. Granier Jonathan P. Dowling Department of Electrical and Computer Engineering Center for Computation and Technology Louisiana State University Baton Rouge LA USA Center for Computation and Technology Louisiana State University Baton Rouge LA USA Hearne Institute for Theoretical Physics Department of Physics and Astronomy Louisiana State University Baton Rouge LA USA

We demonstrate that periodic metallic gratings can greatly enhance the optical absorption efficiency of thin-film solar cells. We also introduce aperiodic multilayer structures with highly directional absorptivity for... 详细信息

关键词： Photovoltaic cells Absorption Gratings Optical polarization Photovoltaic systems Photonics

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Experimentally verified Iterative Learning control based on repetitive process stability theory

Experimentally verified Iterative Learning Control based on ...

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American control Conference (ACC)

作者： Pawel Dabkowski Krzysztof Galkowski Eric Rogers Zhonglun Cai Chris T. Freeman Paul L. Lewin Zdenek Hurak Anton Kummert Department of Control Engineering Faculty of Electrical Engineering Czech Technical University Praque Czech Republic Institute of Physiscs Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University Torun Poland University of Wuppertal Germany Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland Electronics and Computer Science University of Southampton Southampton UK Faculty of Electrical Engineering Czech Technical University Czech Republic Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Germany

This paper gives new results on the design and experimental evaluation of an Iterative Learning control (ILC) law in a repetitive process setting. The experimental results given are from a gantry robot facility that has been extensively used in the benchmarking of linear model based ILC designs. An example is also given to demonstrate that this new design offers much superior performance in comparison to some previous designs based on the Roesser model for 2D linear systems.

关键词： Robots State-space methods Asymptotic stability Educational institutions Vectors Stability criteria

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Ship tracking control based on linear active disturbance rejection control

Ship tracking control based on linear active disturbance rej...

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International Conference on Intelligent control and Information Processing (ICICIP)

作者： Ronghui Li Tieshan Li Qinling Zheng Qiang Li Navigaion College of Dalian Maritime University Dalian China Center for Advanced Control Technologies Department of Electrical Computer Engineering Cleveland State University Cleveland OH USA

Owing to ship's high inertia, strong time lag, non-linearity and under-actuated characteristics, as well as sustaining external disturbances frequently, designing a high performance ship tracking controller is still one of the most important research topics of ship motion control. Active Disturbance Rejection control (ADRC) is proved to be very effective control method because it is independent of mathematical model of the plant and can compensate the internal and external disturbances dynamically. This paper investigates the applications of ADRC in ship motion tracking control and presents the design method of ADRC controller appropriate for ship tracking control. Firstly, ship motion mathematical model is introduced briefly and the linear ADRC (LADRC) is analyzed. Then considering the nonlinear ship track design model as a third order plant after utilizing variable substitution, a LADRC controller is designed by using fourth order linear extended state observer (LESO). At last, the simulation is performed. Simulation results show that the controller has a good tracking performance and disturbance rejection ability and is robust to the ship motion nonlinear characteristic and the external disturbances. The tracking process is fast, smooth and minor energy consumption.

关键词： Marine vehicles Mathematical model Observers Tracking Equations Educational institutions Robustness

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Fractional-order circuit elements with memory

Fractional-order circuit elements with memory

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Petráš, Ivo Chen, YangQuan Institute of Control and Informatization of Production Processes BERG Faculty Technical University of Košice B. Němcovej 3 04200 Košice Slovakia Department of Electrical and Computer Engineering Center for Self-Organizing and Intelligent Systems Utah State University 4120 Old Main Hill Logan UT 84322-4120 United States

ISBN: (纸本)9781457718687

This paper deals with the fractional-order memristive, memcapacitative, and meminductive systems and their utilization in design of the new circuits with memory. We provide a mathematical description of such systems by using a technique of the fractional calculus. Some possible applications of "mem" systems are mentioned in article as well. © 2012 IEEE.

关键词： Calculations

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An Implementation of Distributed Order PI controller And Its Applications To The Wheeled Service Robot

An Implementation of Distributed Order PI Controller And Its...

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第五届国际自动控制联合会分数阶导数及其应用会议

作者： Fengyu Zhou Yang Zhao Yan Li YangQuan Chen School of Control Science and Engineering Shandong UniversityJinan 250061 Shandong P.R. China Center for Self-Organizing and Intelligent Systems (CSOIS) Electrical and Computer Engineering Department Utah State University Logan UT 84322 USA

In this paper,a robust distributed order PI controller design method is derived,which tolerates certain system *** theory and implementation of the distributed order operators are discussed in both time and frequency

关键词： controller An Implementation of Distributed Order PI controller And Its Applications To The Wheeled Service Robot Service

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Measurement-Device-Independent Quantum Key Distribution

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Physical Review Letters 2012年第13期108卷 130503-130503页

作者： Hoi-Kwong Lo Marcos Curty Bing Qi Center for Quantum Information and Quantum Control Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada Escuela de Ingeniería de Telecomunicación Department of Signal Theory and Communications University of Vigo Vigo Pontevedra 36310 Spain

How to remove detector side channel attacks has been a notoriously hard problem in quantum cryptography. Here, we propose a simple solution to this problem—measurement-device-independent quantum key distribution (QKD). It not only removes all detector side channels, but also doubles the secure distance with conventional lasers. Our proposal can be implemented with standard optical components with low detection efficiency and highly lossy channels. In contrast to the previous solution of full device independent QKD, the realization of our idea does not require detectors of near unity detection efficiency in combination with a qubit amplifier (based on teleportation) or a quantum nondemolition measurement of the number of photons in a pulse. Furthermore, its key generation rate is many orders of magnitude higher than that based on full device independent QKD. The results show that long-distance quantum cryptography over say 200 km will remain secure even with seriously flawed detectors.

关键词： QUANTUM cryptography SIGNAL detection PHOTON detectors QUANTUM teleportation LIGHT sources LASER measurement

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Interpolation of Orientation Distribution Functions (ODFs) in Q-ball Imaging

Interpolation of Orientation Distribution Functions (ODFs) i...

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Iranian Conference of Biomedical engineering

作者： Maryam Afzali Emad Fatemizadeh Hamid Soltanian-Zadeh Department of Electrical Engineering Biomedical Signal and Image Processing Laboratory(BiSIPL) Sharif University of Technology Tehran Iran Control and Intelligent Processing Center of Excellence(CIPCE) School of Electrical and Computer Engineering University of Tehran Tehran Iran & Image Analysis Laboratory Radiology Department Henry Ford Health System Detroit Michigan USA

ISBN: (纸本)9781467331289

Diffusion tensor magnetic resonance imaging (DTMRI) is a non-invasive method for investigating the brain white matter structure. It can be used to evaluate fiber bundles in the brain but in the regions with crossing fibers, it fails. To resolve this problem, high angular resolution diffusion imaging (HARDI) with a large number of diffusion encoding directions is used and for reconstruction, the Q-ball method is applied. In this method, orientation distribution function (ODF) of fibers can be calculated. Mathematical models play a crucial role in the field of ODF. For instance, in registering Q-ball images for applications like group analysis or atlas construction, one needs to interpolate ODFs. To this end, principal diffusion directions (PDDs) of each ODF are needed. In this paper, PDDs are defined as vectors that connect the corresponding local maxima of ODF values. Then, ODFs are interpolated using PDDs. The proposed method is evaluated and compared with previous protocols. Experimental results show that the proposed interpolation algorithm preserves the principal direction of fiber tracts without producing any deviations in the tracts. It is shown that changes in the entropy of the interpolated ODFs are almost linear and the bloating effect (blurring of the principal directions) can be removed.

关键词： High angular resolution diffusion imaging (HARDI) Q-ball imaging Orientation distribution function (ODF) Interpolation Principal diffusion direction (PDD)

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Cardiovascular Segmentation Based on Hough Transform and Heuristic Knowledge

Cardiovascular Segmentation Based on Hough Transform and Heu...

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Iranian Conference of Biomedical engineering

作者： Zahra Turani Reza A. Zoroofi Shapoor Shirani Sara. Abkhofte Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran 14395/515 IRAN Department of Radiology School of Medicine Tehran University of Medical Science Tehran IRAN.

ISBN: (纸本)9781467331289

Nowadays cardiovascular diseases are one of the most major causes of mortality. Computed Tomography Angiography (CTA) is a very useful imaging tool for cardiovascular disease diagnosis. So it is important to analyze CTA images well. This paper proposed a new method for fully automatic cardiovascular segmentation based on combination of Hough transform and region growing algorithm. It is a robust method which segments ascending aorta, descending aorta, and left ventricle concurrently. Comparing to the manual method which is done by cardiologist and previous automatic and semi-automatic works, our method is faster, more accurate, and fully automatic. This procedure also can be applied to coronary segmentation. The validation of the acquired cardiovascular images is evaluated by a cardiologist. By evaluating 10 datasets, which contain about 5000 images, the accuracy of the method is 97.3% comparing to the gold standard. Our gold standard is the images segmented by cardiologist. In addition, average elapsed time is 0.18s per image.

关键词： Automatic cardiovascular segmentation Computed Tomography Angiography Hough transform Cardiovascular disease Region growing

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Comparison of Fixed Speed Wind Turbines Models: A Case Study

Comparison of Fixed Speed Wind Turbines Models: A Case Study

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Annual Conference on IEEE Industrial Electronics Society

作者： Gonzalo Bustos Luis S. Vargas Freddy Milla Doris Saez Hamid Zareipour Alfredo Nunez Electrical Engineering Department Universidad de Chile Electrical and Computer Engineering Department University of Calgary Delft Center for Systems and Control Delft University of Technology

ISBN: (纸本)9781467324199

This paper presents a model comparison of a fixed speed wind turbine (FSWT) operating on a real wind farm. By relying on real data obtained from a wind farm operating in the Chilean Interconnected System, three different models are identified and analyzed. First, a phenomenological model based on physical principles governing the production of electricity from wind power is considered. This model is fine-tuned in accordance with practical considerations, such as wind correction factors. Then, a linear model and a Takagi & Sugeno (T&S) fuzzy model are identified. From the experimental results, the linear model is the simplest one, but also the one that presents the worst performance indexes. The best prediction capability is obtained with the T&S model;however, in terms of interpretability, the phenomenological model outperforms the other two black-box models.

关键词： Wind Turbine Model Validation Dynamic Simulation Fixed Speed Wind Turbine Fuzzy Modeling

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