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A compact power converter for hybrid energy systems

A compact power converter for hybrid energy systems

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作者： Cai, Jun Zhong, Qing-Chang Stone, David Dept. Automatic Control and Systems Engineering University of Sheffield SheffieldSI 3JD United Kingdom Dept. Electronics and Electrical Engineering University of Sheffield SheffieldSI 3JD United Kingdom

ISBN: (纸本)9781479940325

In hybrid energy systems, batteries and supercapacitors are usually taken as storage mechanisms for smoothing output power, start-up transition, and various load conditions. As a result, developing hybrid power conversion systems has become an attractive research topic. In this study, a compact non-isolated bidirectional DC-DC converter is proposed to interface two DC power sources, which mainly benefit with reduced power switches. In detail, only two switches are needed while for conventional systems four switches are required. Although the number of switches is reduced by half, the proposed converter is still proficient for energy diversification from two energy sources individually or simultaneously. Another benefit of the proposed converter is its extensibility. Several converters are given by easily extending the proposed converter to different applications. They also feature with reduced power switches compare to conventional systems. Detailed analysis on the topology and control algorithm of the proposed converter are given. Real-time simulation results are provided to verify the validity of the proposed system. © 2014 IEEE.

关键词： Topology

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Wireless for the factory: The Wi-Fact analysis

Wireless for the factory: The Wi-Fact analysis

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IEEE International Forum on Research and Technologies for Society and Industry Leveraging a better tomorrow (RTSI)

作者： Alessia Autolitano Daniele Brevi Gianluca Cena Pietro Cultrona Guido Marchetto Fulvio Rusina' Stefano Scanzio Riccardo Scopigno Riccardo Sisto Istituto Superiore Mario Boella Torino Italy National Research Council of Italy CNR-IEIIT Torino Italy Comau S.p.A. Grugliasco (TO) Italy Dept. of Control and Computer Engineering Politecnico di Torino Torino Italy

Wireless in shop-floors is a bet: it outlines the possibility of making automation more flexible and to simplify plant reconfiguration. However, the specific context subtends several challenging requirements, which the available off-the-shelf solutions are not 100%-ready to cope with. By the way, the potential benefits of wireless for automation are so significant that it is worth investigating novel techniques to enforce the available wireless transceivers, so as to make them suitable for factories. The Italian regional project Wi-Fact is putting under close scrutiny the context of wireless automation to identify the most significant threats and proposing solutions to stem them. This paper take stock of the project achievements at its mid-term turning point.

关键词： IEEE 802.11 Standard Wireless communication Real-time systems Automation Protocols Wireless sensor networks Reliability

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On the Augmentation of Luenberger Observer-Based State Feedback Design for Better Robustness and Disturbance Rejection

On the Augmentation of Luenberger Observer-Based State Feedb...

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American control Conference

作者： Wenchao Xue Zhiqiang Gao Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 P. R. China Dept. of Electrical and Computer Engineering Cleveland State University Cleveland Ohio 44115 USA

ISBN: (纸本)9781479917730

This paper addresses the fundamental problem of improving the Luenberger Observer (LO)-based feedback control so that it can deal with effectively a wide range of uncertainties, both internal and external. It is shown that the effect of such uncertainties can be estimated and cancelled in real time, all based on the yet untapped source of information: the estimation error in the existing LO. The result is quite significant in that, by augmenting the LO without changing its original structure or parameters, the LO-based design can be improved in terms of robustness and disturbance rejection. In other words, there is hidden information of uncertainties in the LO tracking error and it can be extracted, often with a mere integrator, to great benefits, as shown in both mathematical analysis and simulation studies.

关键词： Disturbance rejection Observers Uncertainty original structure State feedback mathematical analysis Information source Robustness feedback control

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Ground truth acquisition of humanoid soccer robot behaviour 1

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17th RoboCup International Symposium, RoboCup 2013

作者： Pennisi, Andrea Bloisi, Domenico D. Iocchi, Luca Nardi, Daniele Dept. of Computer Control and Management Engineering Sapienza University of Rome via Ariosto 25 00185 Rome Italy

ISBN: (数字)9783662444689

ISBN: (纸本)9783662444672

In this paper an open source software for monitoring humanoid soccer robot behaviours is presented. The software is part of an easy to set up system, conceived for registering ground truth data that can be used for evaluating and testing methods such as robot coordination and localization. The hardware architecture of the system is designed for using multiple low-cost visual sensors (four Kinects). The software includes a foreground computation module and a detection unit for both players and ball. A graphical user interface has been developed in order to facilitate the creation of a shared multi-camera plan view, in which the observations of players and ball are re-projected to obtain global positions. The effectiveness of the implemented system has been proven using a laser sensor to measure the exact position of the objects of interest in the field. © 2014 Springer-Verlag Berlin Heidelberg.

关键词： Open source software

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State Space Grids for Low Complexity Abstractions

State Space Grids for Low Complexity Abstractions

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IEEE Annual Conference on Decision and control

作者： Matthias Rungger Alexander Weber Gunther Reissig Department of Electrical and Computer Engineering at the Technische Universitat Munchen 80333 Munich Germany University of the Federal Armed Forces Munich Dept. Aerospace Eng. Chair of Control Eng. (LRT-15) D-85577 Neubiberg (Munich) Germany

ISBN: (纸本)9781479978878

We consider an automated, algorithmic controller synthesis framework for perturbed nonlinear control systems to enforce complex specifications, in which an auxiliary transition system, also known as abstraction or symbolic model, is used as a finite substitute of the original control system in the controller design process. We specifically focus on reducing the computational effort to obtain abstractions, which is the most expensive step in the approach. To this end, we derive a functional to estimate the size of the abstraction, specifically, the number of transitions, and prove that after a suitable transformation the functional becomes strongly convex. Thus, the minimization of the estimated size of the abstraction is an unconstrained strongly convex optimization problem, which is straightforward to solve using standard methods. This permits us to use this functional as a heuristic to determine certain grid parameters for the construction of abstractions. We illustrate the benefits of the newly developed heuristic for two numerical examples.

关键词： Abstraction Heuristics FUNCTIONALS control systems design process state space Nonlinear control systems

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A model-based approach for achieving available automation systems 19

A model-based approach for achieving available automation sy...

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Priego, R. Armentia, A. Orive, D. Estévez, E. Marcos, M. University of the Basque Country Department of System Engineering and Automatics Bilbao48013 Spain Universidad de Jaén Dept. of Electronics and Automatic Control Jaen Spain

ISBN: (纸本)9783902823625

Nowadays automation systems are required to be flexible in order to cope with the ever changing requirements of the applications in terms of complexity, extensibility or dynamism. The use of reconfiguration techniques helps to meet these demanding requirements, but at the same time increase the complexity of the systems. This paper presents a supervisor architecture that allows maintaining the availability of a control system in spite of failures such as a node crash, by means of reconfigurations at the control level. To do this, the advantages that Model-Driven Development technology provides have been explored. © IFAC.

关键词： Automation

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Author's retrospective for: Biomedical image analysis on a cooperative cluster of GPUs and multicores 25

Author's retrospective for: Biomedical image analysis on a c...

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25th ACM International Conference on Supercomputing, ICS 2014

作者： Hartley, Timothy D. R. Çatalyürek, Ümit V. Ruiz, Antonio Igual, Francisco Mayo, Rafael Ujaldon, Manuel Intel Corporation Software and Services Group HillsboroOR United States Dept. Biomedical Informatics Ohio State University ColumbusOH43210 United States Computer Architecture Dept. University of Malaga Malaga Spain Computer Architecture and Automatic Control Dept. Univ. Complutense of Madrid Madrid Spain Dept. of Computer Eng. and Computer Science University Jaume I Castellon Spain

ISBN: (纸本)9781450328401

The last six years has seen Moore's Law continue to produce incredible gains in computational power. Indeed, the November, 2007 list of the top ten fastest supercomputers in the world contained no machines with acceleration of any kind. The same list six years later has four of the ten fastest supercomputers using accelerators, including the top two machines [3] . And the ten greenest supercomputers in November 2013 are using NVIDIA GPUs [1]. This heterogeneity of processing units is present from the top of the computational power spectrum down to the bottom, where GPU hardware coupled with novel CUDA and OpenCL programming paradigms have brought significant performance gains to consumer-grade applications. Copyright © 2014 by the Association for Computing Machinery, Inc. (ACM).

关键词： Graphics processing unit

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Investigation of Plasmon Propagation on Lossy Dielectric Split Ring Resonator, DSRR, Chain over Semiconductor Substrates: Simulations in the tens of Terahertz Range

Investigation of Plasmon Propagation on Lossy Dielectric Spl...

引用

Asia-Pacific Microwave Conference

作者： M. Sabrera S. E. Barbin L. C. Kretly Dept. of Communications DECOM School of Electrical and Computer Engineering FEEC University of Campinas UNICAMP Dept. of Telecommunications and Control Engineering Polytechnic School EPUSP-University of Sao Paulo

ISBN: (纸本)9781479987689

In general, a magnetic plasmon propagation along a chain of connected Single-Split Ring Resonators (SRR) is obtained using metallic cells over a dielectric substrate. This work presents some kind of a "dual" chain, i.e., a dielectric SRR matrix over non-perfect conductors such as semiconductors. For both materials, dielectric SRR cells and substrates, conductive loss is considered. This new configuration at micro and nano scale cells presents -as simulation reveals- a "dielectric" plasmon response in the range of tens of Terahertz.

关键词： Dielectric Plasmon propagation Dielectric resonators SRR PMMA P3HT E-Beam

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Synchronverter-based Transformerless PV Inverters

Synchronverter-based Transformerless PV Inverters

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Annual Conference of the IEEE Industrial Electronics Society

作者： Wen-Long Ming Qing-Chang Zhong Dept. Automatic Control and Systems Engineering The University of Sheffield

ISBN: (纸本)9781479940318

In this paper, a transformerless PV inverter is proposed, which is formed by adding a neutral leg into conventional half bridge inverter. It consists of one neutral leg and one inverter leg. The presence of the neutral leg enables the direct connection between the ground of PV panels and the ground. Two main benefits are then obtained. First, the common mode currents are completely eliminated because the stray capacitors between the PV panels and the grid neutral line are bypassed. Another benefit is the voltage of the PV is only required to be higher than the peak value of the grid voltage, which is same as that of conventional full bridge inverter. In addition, the synchronverter technology designed for three-phase inverters is extended to a single-phase case to design the controller of the inverter leg. As a result, the proposed inverter becomes more grid-friendly. The control of the two legs are independent with each other, which means the controller design much easier. The performance of the whole system is evaluated in detail with the provided real-time simulation results.

关键词： Common model current Photovoltaic Transformerless inverter Half bridge inverter Neutral leg Synchronverter

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Effect of inter-trials variability on the estimation of cortical connectivity by Partial Directed Coherence

Effect of inter-trials variability on the estimation of cort...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： M. Petti S. Caschera A. Anzolin J. Toppi F. Pichiorri F. Babiloni F. Cincotti D. Mattia L. Astolfi the Department of Computer Control and Management Engineering Univ. of Rome "Sapienza" and with Fondazione Santa Lucia Hospital Rome Italy Fondazione Santa Lucia Rome Italy the Dept. Molecular Medicine of the University of Rome "Sapienza" and with Fondazione Santa Lucia Rome Italy

ISBN: (纸本)9781424492695

Partial Directed Coherence (PDC) is a powerful estimator of effective connectivity. In neuroscience it is used in different applications with the aim to investigate the communication between brain regions during the execution of different motor or cognitive tasks. When multiple trials are available, PDC can be computed over multiple realizations, provided that the assumption of stationarity across trials is verified. This allows to improve the amount of data, which is an important constraint for the estimation accuracy. However, the stationarity of the data across trials is not always guaranteed, especially when dealing with patients. In this study we investigated how the inter-trials variability of an EEG dataset affects the PDC accuracy. Effects of density variations and of changes of connectivity values across trials were first investigated with a simulation study and then tested on real EEG data collected from two post-stroke patients during a motor imagery task and characterized by different inter-trials variability. Results showed the effect of different factors on the PDC accuracy and the robustness of such estimator in a range of conditions met in practical applications.

关键词： PDC EEG Effect

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