智能电网中自愈技术的应用

自愈是智能电网的一个突出特征,自愈技术是实现电网自愈的重要保证,也是大电网实现安全运行最有力的支撑。在对国际上自愈控制技术探究的基础上,综合国际上对智能电网的标准,解析了配电网自愈必备的实践要求和数据标准,并且就自愈技术的核心——自愈技术的程控经过、核心装置运行监控测试、分布式能源、网络优化重构等方面进行了探讨。     

基于改进k-means算法的有源配电网网格化规划方法

针对高渗透光伏大规模接入配电网可能引发电压越限和配电网峰谷差大等问题，提出一种考虑负荷互补特性的有源配电网网格划分方法。首先，分析各类配电网网格化规划方案和负荷峰谷互补特性；然后，以网格化规划后子网格负荷曲线与总负荷曲线的形状相似度最高为目标，充分考虑配电网运行约束条件，以改进k-means聚类算法为基础构建网格划分方案，并根据评价指标对划分结果进行评估；最后，以江苏省某县级市城区为例，验证所提网格划分方案的可行性和有效性。     

智能配电网的网络重构自愈技术

自愈控制技术是智能配电网的核心的技术。首先通过智能输配电网的比较以及自愈的技术需求提出了自愈的优化目标;然后通过一个含故障的配电网络拓扑图对自愈过程进行了参数约束式的分析;最后,提出了基于网络重构的智能配电网自愈实现方案及流程。     

油田矿区配电网运行监测与自愈控制技术研究

油田矿区配电网运行监测与自愈控制研究是适应智能配电网发展趋势,符合油田矿区配电网运行实际需求的高级配电自动化系统,是配电网实现智能化的重要支撑。配电网运行监测与自愈控制是以一次网架和设备为基础,以自愈控制系统为核心,综合利用多种通信方式,并通过信息交互总线与其他相关系统互联,对配电网进行监测和控制,以提升配电网异常、故障应急响应速度,提高配电网供电可靠性。     

智能配电网的继电保护技术研究

现代继电保护技术与自动装置的配合是智能配电网实现灵活运行方式及坚强自愈的关键。现简述了智能配电网环境下对传统保护提出的挑战及相对措施,描述了配电网智能框架对现代保护发展的技术支持,并对保护的现状及发展做出总结。     

基于智能分布式馈线自动化的配电网故障快速自愈方法

在分析配电网故障自愈模式的类型及其特点的基础上,重点研究了智能分布式馈线自动化的故障自愈方法,包括各个功能模块及其故障处置逻辑。最后以故障定位为例,应用一种基于智能分布式FA的矩阵方法,对贵州电网某10 kV馈电线路的多种故障情况进行了算例仿真分析,验证了基于智能分布式FA的配电网故障快速自愈方法的可行性。     

智能配电网的继电保护技术研究简

现代继电保护技术与自动装置的配合是智能配电网实现灵活运行方式及坚强自愈的关键.现简述了智能配电网环境下对传统保护提出的挑战及相对措施,描述了配电网智能框架对现代保护发展的技术支持,并对保护的现状及发展做出总结.     

基于大数据的配电网智能管廊体系设计

采用智能监测和和监控设备,设计了基于大数据的配电网智能管廊体系。搭建了体系的主要构架,根据当前配电网管廊内设备的运行现状及运维管理要求,剖析了该体系应具备的主要功能,根据功能的不同,将体系分为终端层、应用层、通信层3个层面,阐明了终端层数据采集系统需要采集的数据及采集技术标准、应用层监控主站的结构组成、对获取的大数据的处理要求及最终人机界面需要实现的功能,为配电网智能管廊的建设奠定了技术基础。     

用电采集数据分析和智能监测系统中大数据分析的设计研究

对用电信息采集系统和智能监测系统中大数据分析架构进行了探究,通过大数据应用场景分析设计,采用决策树计算方法,实现了对配电网运行工况异常智能诊断和在线监测功能。     

配电网自愈技术分析探讨

停电现象将给居民生活、工厂生产带来较大危害,因此,为提高供电可靠性,电力产业应将配电网络进行持续优化,本文以自愈技术为例,分析配电自动化技术、智能微网技术的应用成效,确保配电网络在故障发生时,可以迅速恢复供电。本文首先分析配电网络的自愈概念,其次,结合两项自愈技术来讨论配电故障的快速解决办法;最后,分析自愈技术其架构组成,充分展示配电网在智能发展下的自愈技术体系。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.