变电站综合自动化系统设计分析

变电站的综合自动化指的是在二次设计中,完全实现用计算机对一次设备的安全运行监视、安全操作监视、故障分析、故障记录,以及继电保护等诸多方面的综合性自动化。本文以某110kV变电站为例,分析探讨了变电站综合自动化系统设计的相关内容。     

兼容串行通信与以太网通信的微机保护通信系统研究

随着变电站自动化技术在电力系统中的逐步应用,势必要求变电站中各二次设备逐步实现网络化。微机继电保护装置作为变电站重要的二次设备,对其通信系统提出了很高的要求。本文根据微机保护通信系统的要求,设计了由以太网与串行通信相结合的通信系统,阐述了通信系统的硬件构成,完成了相关驱动程序与通信功能软件的编写。开发的通信系统对于提高电力系统综合自动化水平具有重要的现实意义。     

微机自动化系统在油田变电站的应用及设计探讨

本文通过对油田变电站自动化设计发展阶段及应用现状描述,针对设计中的设备布置方式、小型6kV开闭站自动化系统的设计思路以及断路器二次原理防跳回路接线方式的应用进行分析探讨,找出既适应油田电网现状,又顺应当前发展趋势的优化设计方案,全面提高自动化变电站运行的可靠性和经济性。     

变电站二次设备改造问题探讨

介绍了变电站的数字化改造、变电站二次设备的技术改造、变电站的扩建大修等。重点阐述了变电站的数字化设备、建立数字化信息平台，对二次回路的技术改造、直流系统、变电站综合自动化系统、变电站进行大修时一次设备措施及文明施工应该注意的问题。     

探讨变电站二次系统的优化设计方法

智能变电站是智能电网飞速发展的产物,近年来,智能化变电站日渐发展进步,变电站二次系统急需优化升级。对变电站二次系统进行优化设计,不但能够使电能的效应得以提高,而且能够为变电站运行的安全性与稳定性提供保障。本文在分析变电站自动化系统运行现状与优化设计重要性的基础上,对变电站二次系统的优化设计方法进行了分析与总结,以期进一步提高变电站运行的效率与质量,进而使电网系统运行的安全性与稳定性得到保障。     

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.     

基于IEC61850数字化变电站远动系统研究

随着数字化变电站技术的发展,数字化变电站已是未来变电站发展的关键。本文介绍了数字化变电站自动化系统的技术特点以及基本结构,结合IEC61850标准,结合数字化变电站改造原理,论述数字化变电站自动化二次安全防护和网关设计方案,阐述了网关数据模型,提出了数字化变电站自动化系统的设计思路和技术问题。     

基于DAS和SAS的电力二次安全防护测试平台设计与实现

设计了基于调度自动化及变电站自动化系统的电力二次安全防护测试平台,将电力专用的二次系统安全防护设备的功能、接入方式、性能和稳定性进行测试.该测试平台基于实验室环境,接入被测试的二次防护安全产品,直接构成真实的电网测试环境对被测设备的功能及性能进行测试.本测试平台中使用的软硬件也可根据被测设备的实际情况单独组网测试.测试...     

变电站的干扰及其防护措施

引言 变电站一次设备运行时将产生各种各样的干扰源。二次设备（如微机保护测控设备）就地安装在高压开关柜上，靠近高压电源，受到强电磁干扰。各种干扰可以通过不同的耦合途径作用到二次系统，产生许多垃圾信息，有可能导致通信管理单元死机，影响运行人员对站内设备的运行监视及操作，严重时将引起保护误动，甚至造成设备损坏。一些变电站因干扰产生保护误动时有发生，抗干扰问题解决的好坏直接关系到变电站自动化技术的推广和发展。因此，变电站自动化设备抗干扰问题应引起设计、运行、制造单位的重视，采取必要措施，确保变电站的安全…     

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。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。