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Study on the Microsecond Pulse Homogeneous Dielectric Barrier Discharges in Atmospheric Air and Its Influencing Factors

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Plasma Science and Technology 2011年第6期13卷 676-681页

作者：方志雷枭蔡玲玲邱毓昌 Edmund KUFFEL School of Automation and Electrical Engineering Nanjing University of Technology State Key Laboratory of Electrical Insulation and Power Equipment xi'an Jiaotong University Department of Electrical and Computer Engineering University of Manitoba

The homogeneous dielectric barrier discharge （DBD） in atmospheric air between two symmetric-columnar copper electrodes with epoxy plates as the dielectric barriers is generated using a us pulse high voltage power supply. The discharge characteristics are studied by measurement of its electrical discharge parameters and observation of its light emission phenom- ena, and the main discharge parameters of the homogenous DBD, such as discharge current and average discharge power, are calculated. Results show that the discharge generated is a homogeneous one with one larger single current pulse of about 2 #s duration appearing in each voltage pulse, and its light emission is radially homogeneous and covers the entire surface of the two elec- trodes. The influences of applied voltage amplitude, air gap distance and barrier thickness on the transition of discharge modes are studied. With the increase of air gap distance, the discharge will transit from homogeneous mode to filamentary mode. The higher the thickness of dielectric barriers, the larger the air gap distance for generating the homogeneous discharge mode. The average discharge power increases non-linearly with increasing applied voltage amplitude, and decreases non-linearly with the increase of air gap distance and barrier thickness. In order to generate stable and homogeneous DBD with high discharge power, thin barriers distance should be used, and higher applied voltage amplitude should be applied to small air gap.

关键词： dielectric barrier discharge （DBD） homogeneous mode filamentary mode discharge characteristics influencing factors

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A distributed optimal framework for mobile data gathering with concurrent data uploading in wireless sensor networks

A distributed optimal framework for mobile data gathering wi...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Songtao Guo Yuanyuan Yang High Performance Networking Research Center and State Key Laboratory of Power Transmission Equipment and System Security College of Computer Science Chongqing University Chongqing China Department of Electrical and Computer Engineering Stony Brook University Stony Brook NY USA

ISBN: (纸本)9781467307734;9781467307758

In this paper, we consider mobile data gathering in wireless sensor networks (WSNs) by using a mobile collector with multiple antennas. By taking into account the elastic nature of wireless link capacity and the power control for each sensor, we first propose a data gathering cost minimization (DaGCM) framework with concurrent data uploading, which is constrained by flow conservation, energy consumption, link capacity, compatibility among sensors and the bound on total sojourn time of the mobile collector at all anchor points. One of the main features of this framework is that it allows concurrent data uploading from sensors to the mobile collector to sharply shorten data gathering latency and significantly reduce energy consumption due to the use of multiple antennas and space-division multiple access technique. We then relax the DaGCM problem with Lagrangian dualization and solve it with the subgradient iteration algorithm. Furthermore, we present a distributed algorithm composed of cross-layer data control, routing, power control and compatibility determination subalgorithms with explicit message passing. We also give the subalgorithm for finding the optimal sojourn time of the mobile collector at different anchor points. Finally, we provide numerical results to show the convergence of the proposed DaGCM algorithm and its advantages over the algorithm without concurrent data uploading and power control in terms of data gathering latency and energy consumption.

关键词： Mobile communication Wireless sensor networks Distributed databases Energy consumption Routing power control Optimization

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On Global Consensus of Linear Multi-agent systems Subject to Input Saturation

On Global Consensus of Linear Multi-agent Systems Subject to...

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American Control Conference

作者： Ziyang Meng Zhiyun Zhao Zongli Lin Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22904-4743 USA

ISBN: (纸本)9781457710957

This paper studies the leader-following consensus problem for a group of agents with identical linear systems subject to control input saturation. We focus on two classes of linear systems, neutrally stable systems and double integrator systems. For neurally stable systems, we establish that global consensus can be achieved by linear local feedback laws over an undirected fixed or a switching communication topology. For double integrator systems, we establish that global consensus can be achieved by linear local feedback laws over a fixed communication topology and, with the help of a simple saturation function in the local feedback laws, global consensus can also be achieved over a switching undirected topology. Simulation results illustrate the theoretical results.

关键词： Lead Topology Switches Multiagent systems Linear systems Trajectory

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Distributed Finite-time Cooperative Tracking of Networked Lagrange systems via Local Interactions

Distributed Finite-time Cooperative Tracking of Networked La...

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American Control Conference

作者： Ziyang Meng Zongli Lin Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22904-4743 USA

ISBN: (纸本)9781457710957

This paper studies the finite-time cooperative tracking problem for networked Lagrange systems with a time-varying leader's generalized coordinate derivative. First, a finite-time state feedback control protocol is proposed for each follower by using only local information, under which the states of the followers are shown to converge to those of the leader in finite time. The results of the static feedback design are then extended to those of the dynamic feedback design. The finite-time cooperative tracking problem of networked Lagrange systems over a directed switching communication topology is proposed. With the help of a so-called finite-time consensus-based observer, we show that cooperative tracking of networked Lagrange systems can be achieved in finite time if the leader has directed information paths to each follower at each time instant and the control parameters satisfy certain conditions.

关键词： Lagrange Mentoring tracking problem local information. control parameter

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Compensation of DC-Link Oscillation in Single-Phase to Single-Phase VSC/CSC and power Density Comparison

Compensation of DC-Link Oscillation in Single-Phase to Singl...

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IEEE Energy Conversion Congress and Exposition

作者： Montie A. Vitorino Ruxi Wang Mauricio B. R. Correa Dushan Boroyevich Laboratory of Industrial Electronics and Machine Drive (LEIAM) Department of Electric Engineering and Informatics Federal University of Campina Grande Campina Grande - PB - Brazil Center for Power Electronics System (CPES) The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg - VA - USA

ISBN: (纸本)9781467308021

This work proposes a technique to reduce the low frequency DC-link energy oscillation due to the pulsating singlephase energy flow in a single-phase to single-phase Voltage Source Converter (VSC) and Current Source Converter (CSC) which operate connected to the grid. That pulsating energy is the major responsible for increasing the size of the passive components and power losses in the converter. The pulsation reduction is achieved by incorporating two auxiliar active switches and one passive energy storage element to the rectifier and inverter side. Additionally, this paper presents the comparison of these convertes regarding efficiency and power density. Details control strategy is presented. Simulation and experimental results are provided to validate the theoretical approach.

关键词： DC-Link VSC CSC

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基于介质阻挡大气压空气均匀放电的聚丙稀薄等离子体表面处理(英文)

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高电压技术 2011年第11期37卷 2746-2751页

作者：方志蔡玲玲雷枭邱毓昌 Kuffel Edmund School of Automation and Electrical Engineering Nanjing University of Technology State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Department of Electrical and Computer Engineering University of ManitobaWinnipeg MB R3T 2N2Canada

The homogeneous dielectric barrier discharge(DBD) in atmospheric air is most favorable for polymer surface modification due to the low cost of operation and the ability of ambient on-line continuous uniform *** this paper,polypropylene(PP) films are treated using a homogeneous DBD plasma in atmospheric *** surface properties of PP films are studied using contact angle and surface energy measurement,scanning electron microscopy (SEM) and Fourier transformed infrared spectroscopy(FTIR),and the aging effect after treatment when the treated materials are exposed to open air is also studied,with the modification mechanism being *** is demonstrated that non-thermal plasmas generated by homogeneous DBD in atmospheric air is an effective way to enhance the surface properties of PP *** the plasma treatment,the surface of PP film is etched,and oxygen-containing polar groups are introduced into the *** two processes can induce a remarkable decrease in water contact angle and a remarkable increase in surface energy,and the surface properties of PP films are improved accordingly.

关键词： dielectric barrier discharge(DBD) homogeneous discharge surface modification polypropylene(PP)films hydrophilicity aging effect

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Comparison of TDNN and RNN performances for neuro-identification on small to medium-sized power systems

Comparison of TDNN and RNN performances for neuro-identifica...

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IEEE Symposium on Computational Intelligence Applications In Smart Grid

作者： Molina, Diogenes Liang, Jiaqi Harley, Ron Venayagamoorthy, Ganesh K. Department of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA United States Real-Time Power and Intelligent System Laboratory Missouri University of Science and Technology Rolla MO 65409 United States

ISBN: (纸本)9781424498949

For Artificial Neural Networks (ANN) to become more widely used in power systems and the future smart grids, ANN based algorithms must be capable of scaling up as they try to identify and control larger and larger parts of a power system. This paper goes through the process of scaling up an ANN based identifier as it is driven to identify increasingly larger portions of a power system. Distributed and centralized approaches for scaling up are taken and the pros and cons of each are presented. The New England/New York 68-bus power network is used as the test bed for the studies. It is shown that while a fully-connected (centralized) ANNs is capable of identification of the system with appropriate accuracy, the increase in the training times required to obtain an acceptable set of weights becomes prohibitive as the system size is increased. © 2011 IEEE.

关键词： Recurrent neural networks

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Robust partially mode delay-dependent H∞ output feedback control of discrete-time networked control systems

Robust partially mode delay-dependent H∞ output feedback co...

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作者： Chae, Seunghwan Huang, Dan Nguang, Sing Kiong Department of Electrical and Computer Engineering University of Auckland Private Bag 92019 Auckland New Zealand Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Shanghai 200240 China

ISBN: (纸本)9781457700804

This paper examines robust partially mode delay dependent H ∞ output feedback controller design for discrete-time systems with random communication delays. A finite state Markov chain with partially known transition probabilities is used to model random communication delays between sensors and controller. Based on Lyapunov-Krasovskii functional, a novel methodology for designing a partially mode delay-dependent output feedback controller is proposed. Using cone complementarity linearization algorithm bilinear matrix inequalities (BMIs) are solved to obtain the controller gains. We also show that the results for completely known transition probabilities and completely unknown transition probabilities can be derived as special cases of our result. The effectiveness of the proposed design methodology is demonstrated by a numerical example. To the best of authors' knowledge, the problem of designing an output feedback controller for a partially known transition probability has not been fully investigated. © 2011 AACC American Automatic Control Council.

关键词： Networked control systems

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Analysis of influential factors on the underground cable ampacity

Analysis of influential factors on the underground cable amp...

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electrical Insulation Conference

作者： Wang, Youyuan Chen, Rengang Li, Jian Grzybowski, Stanislaw Jiang, Taosha State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China Department of Electrical and Computer Engineering Mississippi State University Mississippi State MS 39762 United States

ISBN: (纸本)9781457702785

The extensive usage of underground cables is a typical feature of modern power distribution networks. To analyze the influential factors on the underground cable ampacity, a new numerical method to calculate the ampacity of the underground cable is described in this paper. It is programmed by COMSOL software, which is based on the principle of heat transfer and the Finite Element Method. This model completely takes into account the local cable conditions and complicated variable external environments. Its parameters can be updated according to the change of these influencing factors. The developed model is applied to analyze the impact of the different influential factors on the underground cable ampacity. The results show that the underground cable ampacity depends on many of the installation properties and conditions, of which the soil thermal resistance, the environment temperature, the laying way (the cable spacing and the cable number in the trench) and the external heat source are the main factors. The underground cable ampacity increases with the increase of the soil thermal conductivity and the distance from the external heat source, while it decreases linearly with the increases of the environment temperature. © 2011 IEEE.

关键词： Finite element method

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An efficient power electronics solution for lateral multi-junction solar cell systems

An efficient power electronics solution for lateral multi-ju...

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Annual Conference of Industrial Electronics Society

作者： Mohammed Khorshed Alam Faisal H. Khan Abu Saleh Imtiaz Power Engineering and Automation Research Laboratory (PEARL) Department of Electrical and Computer Engineering University of Utah Salt Lake USA

Compared to a single junction solar cell, a multi-junction (MJ) solar cell can extract higher energy from sun by splitting the solar spectrum. Depending on the spectrum splitting techniques, two different structures of MJ solar cells are possible: vertical multijunction solar cell (VMJ) and lateral multijunction solar cell (LMJ). Both of these structures have their own advantages and limitations. LMJ solar cell has the potential to emerge as an effective solution for solar energy conversion although the availability of research materials on LMJ is limited compared to that of VMJ. In this paper, a complete photovoltaic (PV) power system constructed from lateral multijunction solar cells is proposed along with a new interconnection technique. The I/V characteristics of the solar cells have been matched in the proposed interconnection using a multi-input dc-dc converter. In order to ensure maximum power point (MPP) operation, particle swarm optimization algorithm is applied that requires only one maximum power point control for four solar modules resulting in cost and complexity reduction. Particle swarm optimization algorithm has the potential to track the global maxima of the system even under complex illumination situations. A complete functional system with the implementation of the proposed algorithm has been presented in this paper with relevant experimental results.

关键词： Photovoltaic cells Junctions Integrated circuit interconnections power generation Photonic band gap Materials Lighting

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