基于配电物联网的反窃电预警系统研究及应用

基于电力物联网建设方向，结合大数据、人工智能深度机器学习技术，提出了基于配电物联网的反窃电预警系统研究及应用。通过配电台区"变-线-相-户"分段、分层的窃电台区嫌疑分析，客户用电负荷曲线的特征分析，精准锁定窃电嫌疑用户，提高供电单位窃电预警能力。首先，采用边缘物联代理技术采集用电特征数据，获取电表的电气数据及自动拓扑关系；其次，采用聚类、分层分析建立反窃电预警模型并结合专家诊断库生成窃电嫌疑用户清单；再其次，警电联动应用将窃电嫌疑用户推送至公安侦办系统，形成警电联动体系，最后展望系统扩展对相关业务的支撑，旨在探讨电网企业应用反窃电预警系统的价值。     

基于遗传算法优化BP神经网络的窃电分析

目前我国存在着严重的窃电现象,窃电手段繁多而且隐蔽,这使得工作人员的反窃电工作越来越难。基于供电企业能够采集用户用电数据,本文通过选取用户的相关历史数据进行处理和分析。根据对窃电数据特性的分析研究,挑选出月用电量、台区线损值、最大线损值、功率因素、三相不平衡率、合同容量比六个电气参量作为窃电数据的分析指标,采用遗传算法优化BP神经网络算法构建窃电分析模型,对指标样本数据进行分析,得到用户的窃电嫌疑系数,筛选出用电情况异常用户。本方法能够较方便、全面、智能的分析用户的用电情况,为供电企业实施反窃电工作指明了大致的方向,简化了反窃电的许多工作。     

小波神经网络在反窃电系统中的应用研究

针对目前窃电现象普遍存在及反窃电工作难度越来越大的现状,为有效检测评估用户的用电状态,通过对用户用电信息数据的处理和分析,提取出相应的指标来构建指标评价体系。在对小波神经网络初值的设置和训练更新的策略进行改进的基础上,提出了一种基于改进小波神经网络的反窃电系统数学模型,从而获得用户窃电的嫌疑因子和窃电方式,并通过与其它网络模型在反窃电系统实例的对比分析验证了本文方法的有效性和优越性。本研究成果可为电力公司的反窃电工作提供有效的理论参考和技术指导。     

用电检查出现的问题及反窃电的措施研究

电力营销管理工作中最为重要的就是用电检查,但反窃电工作是用电检查工作中的难点与重点。文章根据作者多年来的用电检查工作经验,对用电检查过程中出现的违章用电及窃电严峻的情况进行总结,阐述了反窃电检查工作过程中出现的难点。结合实际用电检查工作,从而进一步避免窃电与窃电查处的有效措施。     

一种基于离群算法的窃电行为检测的研究

针对窃电行为现场查证具有难以克服的现实困难,提出一种基于离群数据挖掘的窃电行为检测方法。该离群算法基于密度聚类算法,采用基于用电量波动的不同方向识别不同的用电模式,基于用电频率、离群距离以及异常规则关联度的计算挖掘潜在离群数据点,并通过基于评价矩阵确定离群阈值对离群数据点存在窃电行为的可能性进行确定性分析,实现对窃电行为的数据化检测。最后通过仿真测试证明该算法在针对混杂不同用电模式的用电数据的窃电检测方面相对于其他数据挖掘算法具有更好的性能表现。     

基于样本优化选取的支持向量机窃电辨识方法

目前窃电行为普遍存在,如何提高用户用电系统的窃电辨识能力是电力公司一直关注的热点问题。随着智能电表在各地区的普及,数据挖掘等大数据分析技术在用电数据处理上的应用越来越受到重视。针对电力公司亟待解决的反窃电问题,在研究支持向量机原理和分析用电数据特性的基础上,将One-class SVM算法引入到疑似窃电判断当中,提出了一种将电量波动特征和One-class SVM结合的窃电辨识模型。首先提出改进的电量数据波动系数来表征电量波动,然后设计了基于One-class SVM窃电辨识方案。提出一种以电量波动系数作为指标选取训练样本的方法,训练得到相应分类模型,通过该模型分析用电数据从而辨别出是否存在窃电行为。算法验证结果表明该方法能提高窃电辨识的准确率和效率,具备一定的实用性。     

基于多特征融合的用户窃电行为快速识别研究

不同的用电行为会产生不同的特征数据,因此可以根据用电特征来识别用户窃电行为,提出基于多特征融合的用户窃电行为快速识别方法。将额定电压偏离度、电压不平衡系数及电流不平衡系数作为用电行为特征进行提取,利用多特征融合技术,建立用电行为模型,对重点嫌疑用户窃电异常行为的快速识别。通过实验证明,所提出的识别方法无论是识别精度还是识别效率均具备显著优势。由于在窃电行为识别过程中对异常数据的分析粒度较粗,导致识别结果的可靠性较低,为此提出了基于决策树的远程窃电行为识别系统设计研究。将Z-turnBoard嵌入式单板作为系统的核心构件,结合线路电量平衡关系,计算出以单位窗口期线损率为基准的窃电行为特征参量,将计算结果作为决策树的根节点,将各分线线损率作为决策树的分支,通过迭代的方式细化分析粒度,得到最终的窃电行为位置。测试结果表明,设计系统对窃电行为的识别准确率和召回率均值分别达到了91.26%和93.59%。     

电力营销反窃电技术和应用研究

随着经济全球化的发展,我国用电需求量保持逐年增长的趋势。而我国电力部门在用电稽查、用电管理等方面却缺乏高效的手段,导致窃电行为日趋明显。窃电行为的产生严重损害了电力企业与国家的经济效益,对电力用户的正常用电造成了不利的影响。因此,电力企业必须针对窃电行为而采取相应的电力营销反窃电技术,切实提高反窃电水平,实现最优化的企业经济效益。     

单片机在防窃电自动检测装置中的应用

本文采用矢量分析的方法对用电状态进行实时监测，能准确、及时地识别并记录窃电时间、窃电方式和窃电量，通过查询、打印或远传的方式输出结果。     

单片机在防窃电自动检测装置中的应用

本文采用矢量分析的方法对用电状态进行实时监测，能准确、及时地识别并记录窃电时间、窃电方式和窃电量，通过查询、打印或远传的方式输出结果。     

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.     

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.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate