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基于配电网可靠性和网络重构方面的研究,提出了一种考虑配电网可靠性下的重构快速方法。首先通过对可靠性指标体系研究,确定以有功网络损耗(LOSS)、系统供电量不足(ENS)和平均供电可用率(ASAI)作为评价指标体系,并进行了归一化构建配电网多目标模型,运用判断矩阵法将多目标函数转化为新的单一目标函数,实现对配电网系统的重构优化快速计算。算法在重构后期引入可靠性评估,提高了配电网最优解的求解效率。通过IEEE69算例验证了新的配电网重构优化算法在获得全局最优解的同时,降低了计算时间,能有效解决复杂网络的重构优化问题。 相似文献
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分布式电源接入对配电网供电可靠性的影响是目前供电企业研究的主要问题,分布式电源技术在我国起步较晚,仍旧属于新型技术。在发挥着重要作用的同时,也存在一些问题。本文对分布式发电技术进行了分析,并研究了对配电网供电可靠性的影响,同时对接入优化展开了相关的研究。 相似文献
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配电网重构一般采用对单一目标优化,而配电网重构却是一个多目标优化问题。因此,在此提出了基于小生境思想的遗传算法,以配电网的经济性、安全性和供电可靠性为目标,并采用Pareto寻优方式,得出Pareto最优解集,实现了和以往不同的另一种寻优方式,即先寻优后决策。在寻优过程中,通过小生境环境和交叉率和变异率的自适应机制,提高了遗传算法的全局收敛能力和收敛速度,并通过算例验证了方法的有效性。 相似文献
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随着我国电力事业的不断发展,电力在人们生活中的广泛应用,但是在电力的应用过程中还存在着许多问题.分析了目前中压配电网连接中的集中连接方式,分析了它们的特点.并且根据电力供应中的管理现状,以及在供电过程中存在的相关问题提出了有效的解决方法.本文就中压配电网链接方式,中压配电网线损管理,进行了以下分析. 相似文献
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配电自动化技术是服务于城乡配电网建设的重要技术,而通信技术是配电自动化的关键。传统配电网的保护及结构,包括管理运行方式都不适应现代电力市场需要。自动化通信技术在如今的电力市场中对提高电网运行及经济效益有着重大的意义。因此,本文通过对县级供电企业配电网自动化通信难点及其问题分析,为优化及更好的选择县级供电企业配电网自动化通信技术进行了探索。 相似文献
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配电网是电力系统的重要组成部分,其自动化实现程度的高低直接影响到配电的可靠性与质量问题。配电网自动化是提高供电可靠性和供电质量、扩大供电能力、实现配电网高效经济运行的重要手段,也是实现智能电网的重要基础之一。配电网自动化主站系统是配电网自动化系统的核心部分,主要实现配电网数据采集与监控等基本功能以及配电网拓扑分析应用等扩展功能,并具有与其他应用信息系统进行信息交互的功能,为配电网调度指挥和生产管理提供技术支撑。本文主要介绍了配电网自动化主站系统的建设模式,阐述了配电网主站系统的现状,重点分析了配电网主站系统的发展趋势,希望对配电网的相关工作人员有所帮助。 相似文献
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配电网是电力系统的重要组成部分,其自动化实现程度的高低直接影响到配电的可靠性与质量问题。配电网自动化是提高供电可靠性和供电质量、扩大供电能力、实现配电网高效经济运行的重要手段,也是实现智能电网的重要基础之一。配电网自动化主站系统是配电网自动化系统的核心部分,主要实现配电网数据采集与监控等基本功能以及配电网拓扑分析应用等扩展功能,并具有与其他应用信息系统进行信息交互的功能,为配电网调度指挥和生产管理提供技术支撑。本文主要介绍了配电网自动化主站系统的建设模式,阐述了配电网主站系统的现状,重点分析了配电网主站系统的发展趋势,希望对配电网的相关工作人员有所帮助。 相似文献
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长时间以来,配电网线路单相接地的故障定位问题,一直是国内外研究的重点对象之一,随着我国社会主义经济的不断发展以及人们生活水平的不断提高,对于供电方面的需要和要求也随之发生了变化。在供电事业的发展过程中,有一个问题已经不得不引起重视了,那便是配电网线路单相接地的故障定位问题,据不完全数据的统计,我国现阶段每年由于配电网发生单相接地故障,都会造成我国每年十几万度供电的减少,极大地影响了供电企业的经济效益和对供电指标的完成,更是从一定程度上制约了我国社会主义经济的发展步伐。为此,笔者在本文中结合自身的工作经验和对相关知识的了解,简述了单相接地故障带来的影响和危害,简要分析了我国现阶段常用的故障定位方法,并且针对配电网线路单相接地故障定位装置的研究进行了详细的探究和论述。 相似文献
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10kV配电网作为电力系统的重要组成部分,其供电可靠性关系着整个电力系统的安全、稳定运行,从而直接影响着供电区域内人们的正常生产生活。因此,有必要对10kV供电可靠性相关问题进行研究。文章结合目前10kV配电网实情,在归纳总结10kV配电网供电可靠性影响因素的基础上,提出了综合性的提高10kV配电网供电可靠性的具体措施,可为相关工作者提供技术参考。 相似文献
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战术互联网的网络重组是在网络节点或通信链路发生故障,或受到安全威胁时,保证网络强壮性的重要手段之一。根据战术互联网特殊的移动网络环境,提出基于作战指挥原则的组织重组方法。仿真实验结果证明了这些方法的有效性。 相似文献
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Many state-of-the-art wireless sensor networks have been equipped with reprogramming modules, e.g., those for software/firmware
updates. System migration tasks such as software reprogramming, however, will interrupt normal sensing and data processing
operations of a sensor node. Although such tasks are occasionally invoked, the long time of such tasks may disable the network
from detecting critical events, posing a severe threat to many sensitive applications. In this paper, we present the first
formal study on the problem of downtime-free migration. We demonstrate that the downtime can be effectively eliminated, by
partitioning the sensors into subsets, and let them perform migration tasks successively with the rest still performing normal
services. We then present a series of effective algorithms, and further extend our solution to a practical distributed and
localized implementation. The performance of these algorithms have been evaluated through extensive simulations, and the results
demonstrate that our algorithms achieve good balance between the sensing quality and system migration time.
Yangfan Zhou is a PhD student in the Computer Science and Engineering Department at The Chinese University of Hong Kong. He received the B.Sc. (2000) degree in electronics from Peking University and the M.Phil (2005) degree in computer science and engineering from the Chinese University of Hong Kong. He also worked in industrial area as hardware engineer and later software engineer in China from 2000 to 2003. His research interests are in wireless ad hoc and sensor networks. Michael R. Lyu received the B.S. (1981) in electrical engineering from National Taiwan University, the M.S. (1985) in computer engineering from University of California, Santa Barbara, and the Ph.D. (1988) in computer science from University of California, Los Angeles. He is a Professor in the Computer Science and Engineering Department of the Chinese University of Hong Kong. He worked at the Jet Propulsion Laboratory, Bellcore, and Bell Labs; and taught at the University of Iowa. His research interests include software reliability engineering, software fault tolerance, distributed systems, image and video processing, multimedia technologies, and mobile networks. He has published over 200 papers in these areas. He has participated in more than 30 industrial projects, and helped to develop many commercial systems and software tools. Professor Lyu was frequently invited as a keynote or tutorial speaker to conferences and workshops in U.S., Europe, and Asia. He initiated the International Symposium on Software Reliability Engineering (ISSRE), and was Program Chair for ISSRE’1996, Program Co-Chair for WWW10 and SRDS’2005, and General Chair for ISSRE’2001 and PRDC’2005. He also received Best Paper Awards in ISSRE’98 and in ISSRE’2003. He is the editor-in-chief for two book volumes: Software Fault Tolerance (Wiley, 1995), and the Handbook of Software Reliability Engineering (IEEE and McGraw-Hill, 1996). He has been an Associate Editor of IEEE Transactions on Reliability, IEEE Transactions on Knowledge and Data Engineering, and Journal of Information Science and Engineering. Professor Lyu was elected to IEEE Fellow (2004) and AAAS Fellow (2007) for his contributions to software reliability engineering and software fault tolerance. He was also named Croucher Senior Research Fellow in 2008. Jiangchuan Liu received the BEng degree (cum laude) from Tsinghua University, Beijing, China, in 1999, and the PhD degree from The Hong Kong University of Science and Technology in 2003, both in computer science. He was a recipient of Microsoft Research Fellowship (2000), a recipient of Hong Kong Young Scientist Award (2003), and a co-inventor of one European patent and two US patents. He co-authored the Best Student Paper of IWQoS’08. He is currently an Assistant Professor in the School of Computing Science, Simon Fraser University, British Columbia, Canada, and was an Assistant Professor in the Department of Computer Science and Engineering at The Chinese University of Hong Kong from 2003 to 2004. His research interests include multimedia systems and networks, wireless ad hoc and sensor networks, and peer-to-peer and overlay networks. He is an Associate Editor of IEEE Transactions on Multimedia, and an editor of IEEE Communications Surveys and Tutorials. He is a Senior Member of IEEE and a member of Sigma Xi. 相似文献
Jiangchuan LiuEmail: |
Yangfan Zhou is a PhD student in the Computer Science and Engineering Department at The Chinese University of Hong Kong. He received the B.Sc. (2000) degree in electronics from Peking University and the M.Phil (2005) degree in computer science and engineering from the Chinese University of Hong Kong. He also worked in industrial area as hardware engineer and later software engineer in China from 2000 to 2003. His research interests are in wireless ad hoc and sensor networks. Michael R. Lyu received the B.S. (1981) in electrical engineering from National Taiwan University, the M.S. (1985) in computer engineering from University of California, Santa Barbara, and the Ph.D. (1988) in computer science from University of California, Los Angeles. He is a Professor in the Computer Science and Engineering Department of the Chinese University of Hong Kong. He worked at the Jet Propulsion Laboratory, Bellcore, and Bell Labs; and taught at the University of Iowa. His research interests include software reliability engineering, software fault tolerance, distributed systems, image and video processing, multimedia technologies, and mobile networks. He has published over 200 papers in these areas. He has participated in more than 30 industrial projects, and helped to develop many commercial systems and software tools. Professor Lyu was frequently invited as a keynote or tutorial speaker to conferences and workshops in U.S., Europe, and Asia. He initiated the International Symposium on Software Reliability Engineering (ISSRE), and was Program Chair for ISSRE’1996, Program Co-Chair for WWW10 and SRDS’2005, and General Chair for ISSRE’2001 and PRDC’2005. He also received Best Paper Awards in ISSRE’98 and in ISSRE’2003. He is the editor-in-chief for two book volumes: Software Fault Tolerance (Wiley, 1995), and the Handbook of Software Reliability Engineering (IEEE and McGraw-Hill, 1996). He has been an Associate Editor of IEEE Transactions on Reliability, IEEE Transactions on Knowledge and Data Engineering, and Journal of Information Science and Engineering. Professor Lyu was elected to IEEE Fellow (2004) and AAAS Fellow (2007) for his contributions to software reliability engineering and software fault tolerance. He was also named Croucher Senior Research Fellow in 2008. Jiangchuan Liu received the BEng degree (cum laude) from Tsinghua University, Beijing, China, in 1999, and the PhD degree from The Hong Kong University of Science and Technology in 2003, both in computer science. He was a recipient of Microsoft Research Fellowship (2000), a recipient of Hong Kong Young Scientist Award (2003), and a co-inventor of one European patent and two US patents. He co-authored the Best Student Paper of IWQoS’08. He is currently an Assistant Professor in the School of Computing Science, Simon Fraser University, British Columbia, Canada, and was an Assistant Professor in the Department of Computer Science and Engineering at The Chinese University of Hong Kong from 2003 to 2004. His research interests include multimedia systems and networks, wireless ad hoc and sensor networks, and peer-to-peer and overlay networks. He is an Associate Editor of IEEE Transactions on Multimedia, and an editor of IEEE Communications Surveys and Tutorials. He is a Senior Member of IEEE and a member of Sigma Xi. 相似文献
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随着异构网络融合和网络自适应化逐渐成为必然的发展趋势,认知无线网络随之出现,并提供了一种实现全局端到端目标优化的方法。认知无线网络由能自适应改变自身配置的网络设备组合而成,为设计灵活高效的拓扑策略提供了可能性和保障。提出了一种拓扑重构的控制策略,能够规划数据传输路由,在高效利用空闲频谱资源的同时,提升了传输的效率和性能。 相似文献
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端到端重配置技术起源于软件无线电,软件无线电技术实现了终端的多模式支持功能,并实现了软件从空中接口的下载.端到端重配置技术利用软件无线电提供的重配置能力,构建起以可重配置的终端、基站等网元为主体的体系结构,结合先进的动态网络规划、灵活频谱管理和联合无线资源管理技术,实现对重配置能力和异构无线资源的有效利用,保证用户的无缝业务体验.本文论述了端到端重配置技术的产生背景、基本概念和研究现状,对重配置研究中的主要问题和关键技术(包括架构、规划和管理等方面的内容)进行了系统的总结,最后就重配置未来研究的重点提出了自己的看法. 相似文献
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基于重构的片上网络容错机制 总被引:1,自引:0,他引:1
为了保证片上网络的可靠性,本文提出了一种新的容错机制。在片上网络中由于路由器故障将导致与其连接的IP核不能与其他核通信,使片上网络的可靠性降低。本文的方法通过选择最优相邻的路由器来替代故障路由器,从而达到恢复IP核通信的目的。通过为每个路由器配置一个状态寄存器,用来存储相邻路由器的安全度,在路由时采用新的可重构路由算法绕过故障的路由器,以提高片上网络的可靠性。在OPNET平台上对5×52D-Mesh结构的片上网络进行仿真实验,统计了数据传输延时。试验结果表明,本文提出的路由算法与对比文献的路由算法相比,在延迟方面有明显的优势。 相似文献