1lOkV变电站综合自动化系统设计研究

针对目前变电站综合自动化的新建及常规变电站改造工程，介绍、分析了变电站综合自动化系统的三种基本模式，并提出了一种1lOkV变电站综合自动化系统的设计方案。该方案首先从模式上进行总体选择，然后分别从数据通信子系统、监控子系统、保护子系统进行设计，并针对目前变电站综自系统存在的问题，提出了一些在设计过程中需要注意的问题。     

Moxa V2402嵌入式计算机变电站SCADA后台机

变电站综合自动化是一项提高变电站安全、可靠稳定运行水平,降低运行维护成本,提高经济效益,向用户提供高质量电能服务的一项措施。随着自动化技术、通信技术、计算机和网络技术等高科技的飞速发展,一方面综合自动化系统取代或更新传统的变电站二次系统,已经成为必然趋势。另一方面,保护本身也需要自检查、故障录波、事件记录、运行监视和控制管理等更强健的功能。发展和完善变电站综合自动化系统,是电力系统发展的新的趋势。     

变电站微机保护通信故障及处理

针对变电站综合自动化系统现场实际运行中微机保护装置与监控系统通信的常见故障:站控层网络通信中断、保护装置误发软报文、保护状态量采集故障、35kV断路器遥控成功率低进行了分析,提出了处理措施。总结归纳了故障发生的原因:设备老化和不同设备厂家的通信接口兼容性问题。主要介绍了变电站微机保护装置通信的故障解决方法,为正确处理综自系统的此类故障提供了借鉴。     

在超高压变电站运行中综合自动化系统的应用

随着社会的进步和经济的发展,各行各业对电力的需求明显增加,而人们的日常生活也越来越离不开电力的支持,传统变电站所应用的二次系统所存在的不足开始逐渐显露了出来,综合自动化系统正是依托于当今的时代背景而产生并且逐渐发展壮大的。本文以对综合自动化系统的功能进行阐述为出发点,系统的分析了在超高压变电站应用综合自动化系统时存在的问题以及相应的解决方法,供技术人员参考。     

基于变电站综合自动化保护系统的研究

变电站综合自动化即要实现对变电站的主要设备和输、配电线路的自动监视、测量、自动控制和微机保护,以及调度通信等综合自动化功能.随着计算机技术、网络通信技术和微电子技术的发展,变电站综合自动化在电力系统和厂矿企业已获得了广泛的应用,它替代了变电站常规二次设备,简化了变电站二次接线.实际的生产运行表明,变电站综合自动化保护系统是提高变电站安全稳定运行水平、降低运行维护成本、提高经济效益、向用户提供高质量电能的一项重要技术措施.     

矿区变电站综合自动化技术的应用

分析了变电站综合自动化系统的特点、主要结构形式 ,提出了一种基于现场总线的变电站综合自动化系统的网络结构 ,并结合应用实例分析了变电站综合自动化系统各组成部分的功能     

一种遥信回路故障问题分析

分析变电站综合自动化系统测控装置遥信采集回路设计缺陷对变电站安全运行的影响,指出一种遥信回路的缺陷所在,并提出了合理的设计方案。     

电力系统变电站自动化系统的调试

电站综合自动化是一项提高变电站安全、稳定运行水平,降低运行维护成本,提高经济效益,并向用户提供高电能服务的一项措施.随着自动化技术、通信技术、计算机和网络技术等高科技的飞速发展,一方面综合自动化系统取代或更新传统的变电站二次系统,已经成为必然趋势.另一方面,保护本身也需要自检查、故障录波、事件记录、运行监视和控制管理等更强健的功能.     

NSA3000变电站综合自动化系统的应用

介绍NSA3000变电站综合自动化系统的结构、功能、特点,提出NSA3000变电站综合自动化系统在实际应用中存在的一些问题,以及为进一步提高其运行可靠性、稳定性采取的有效措施.     

变电站综合自动化系统设计

针对变电站的实际运行,设计了基于Web平台上的变电站综合自动化系统三层体系结构.站控层监控主机对变电站进行动态全过程自动监视调节,OPC技术作为监控主机与上层应用程序的通信接口,实现变电站运行设备和数据库服务器之间的数据传输和交换.Web服务器和后台实时数据库实现了变电站运行信息的在线查询和报表处理.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.