基于IEC 61850第二版变电站配置描述的集成配置解耦

变电站配置描述(SCD)集成配置是智能变电站建设的重要环节,目前,SCD集成配置中存在较强的耦合性,严重影响到集成工作的效率和质量。从SCD集成配置中各环节入手,分析了耦合产生的原因,提出对现有SCD集成配置流程进行改进,理清装置能力描述(ICD)提交与智能电子设备(IED)更新中IED配置工具与系统配置工具的分工协作关系,支持SCD并行配置以及对SCD集成配置更新影响范围进行评估等措施,从而实现对SCD集成配置的解耦,最后分析了解耦对配置工具的要求。应用SCD集成配置解耦方法可以减少配置中更新迭代的次数,提高集成效率,在智能变电站建设中具有较重要的实用价值。     

基于调度数据网的变电站智能设备远程维护系统

随着变电站综合自动化技术的应用与发展,大量无人值守的变电站陆续投入运行。对变电站内智能型装置(如RTU、测控单元)的有效维护是确保调度自动化系统正常发挥作用的基础。文章介绍了一种基于数据通信网的灵活实用的远程维护方案,利用调度自动化通信技术及SCADA技术,综合多种智能算法,实现设备故障的及时发现和诊断处理,为电网调度自动化系统的可靠运行提供技术保障。     

使用交互式编解码机制的分布式视频编码研究

为了克服Slepian-Wolf编码不存在统一编码以及采用的无记忆信道模型不符合实际等问题,运用交互式编解码(IED)方式,建立了统一编码,构建了有记忆的有限状态信道(FSC)模型,同时设计了一种适合FSC的用于LDPC解码的置信传播算法。实验结果表明,实现后的IED相比非IED具有更低的误码率(BER),且与理论极限码率更加逼近,实际视频序列的测试结果显示,实现的IED分布式视频编码系统较LDPC算法有2dB左右的率失真性能增益。     

数字化变电站IED互换性研究

受智能设备数据模型配置技术的限制,数字化变电站智能电子设备互换性还未能实现.在不改变 IEC61850 通信标准体系的前提下,提出了资源定义机制和基于需求激励的资源匹配机制,将 IED 的资源分为需求资源对象和生产资源对象.该定义机制在考虑 IED 拓扑关系的基础上,实现了变电站智能设备数据模型的自动配置,通过生产资源...     

Joint impact of sensing time and IED parameter on the performance of an energy efficient cognitive radio system

Joint impact of sensing time and improved energy detector (IED) parameter is evaluated for an energy efficient cooperative cognitive radio (CR) system where the CR users use IED. The aim of this work is to design the CR system in such a way that it can achieve two objectives for a given level of protection on primary user: (i) optimization of sensing time to make balance between detection performance and throughput and (ii) appropriate allocation of energy between sensing time and transmission time so as to enhance the energy efficiency of the CR system. The key parameters such as sensing time and IED parameter are set appropriately to meet the objectives. The performance is assessed in terms of throughput and energy efficiency of the system. The effect of the sensing time and the IED parameter on the performance is evaluated under a collision constraint. Furthermore, the optimal sensing time and IED parameter are investigated jointly for which the higher throughput as well as maximum energy efficiency can be obtained, and at the same time, a desired detection probability can also be maintained by the CR system. Copyright © 2016 John Wiley & Sons, Ltd.     

基于IEC61850标准中SCL的智能电子设备建模

IEC61850是国际标准组织最新颁布的变电站自动化网络通信标准,SCL是IEC61850推荐的变电站配置语言,可以清楚地描述装置的配置信息,实现不同设备的共享。文中针对目前变电站的发展趋势,介绍了符合IEC61850标准的通信模型的建立规则,并根据SCL对模型搭建的要求搭建了一个简单的模型,最后对所建模型进行了检测与验证,证实了其正确性。     

Evaluation of Y2O3 surface machinability using ultra-precision lapping process with IED

Prospects of Y₂O₃ have been more extended as a great promising and creditable material for optical, electronic and mechanical purposes. Y₂O₃ has been more observed as a fine ceramic which has great material properties: high light transparency, excellent thermal resistance and chemical inertness. But in terms of effective application of Y₂O₃, its hard and brittle nature needs to be overcome during the surface machining process. Therefore, the surface machining control of Y₂O₃ should be conducted carefully. The evaluation for stable and continuous machining should also be investigated in various industrial fields as there are only limited studies on the subject. The lapping process with in-process electrolytic dressing (IED) is widely used for surface machining of hard and brittle materials. In this study, Y₂O₃ surface machinability was evaluated by using the ultra-precision lapping process with IED method by changing three major variables: applied force, wheel speed and machining time. The most suitable value of Ra 92nm surface roughness was acquired with smooth surface quality from the following machining condition: 7kg of applied force, 60rpm of wheel speed and 30minutes of machining time. After the lapping process, the machining tendency and surface characteristics were analyzed with fracture toughness and Vickers hardness for the evaluation of Y₂O₃ surface machinability. This paper was recommended for publication in revised form by Associate Editor Dae-Eun Kim Eun-Sang Lee received B.S. and M.S. degrees in Mechanical Engineering from INHA University in 1985 and in 1987. After that time, he received a Ph.D. degree from Korea Advanced Institute of Science and Technology in 1998. Dr. Lee is currently a Professor at the School of Mechanical Engineering at INHA University in Incheon, Korea. His research fields are ultra-precision manufacturing, electro chemical micro machining and development of semiconductor wafer polishing system.     

基于IEC 61850的变电站二次系统工程调试与质量控制

针对基于IEC 61850的变电站二次系统,通过分析其技术来源、技术作用以及应用目的,探讨了变电站智能电子设备（intelligent electronic device,IED）集成基础上的调试工作及其传承。根据二次系统与传统系统的技术特点、调试工作差异,讨论了二次系统组态调试和工程调试的目标及其区别与联系。根据变电站工程调试的内涵与目的,综合二次系统结构以及功能构成特点,建设性论述了二次系统的工程调试方法以及相应的质量控制策略,并注重了调试项目的过程完整性与整体质量控制。     

支持大规模智能电网的数据存储方法

针对大规模智能电网中的监测数据具有海量性、实时性、动态性等特点,提出一种以数据为中心的支持大规模智能电网的数据存储方法:海量动态数据的分层扩展存储机制。首先,采用扩展哈希编码方法动态增加存储节点,避免突发、频发事件数据的丢失,增强系统的可用性;然后,采用多阈值级别方法将数据分散到多个存储节点上,避免出现存储热点问题,实现负载均衡。实验结果表明,分层扩展存储机制能够最大限度地满足海量数据的存储需求,获得较好的负载均衡,并且使总能耗最低,有效地延长了网络的生命周期。     

基于IED的微网关联区域保护研究

为克服微网中保护整定困难、选择性不足等带来的问题,提出了基于智能电子设备的微网关联区域保护的方法。根据微网的5种区域划分思想,提出了区域属性的概念,并采用IED将微网5种区域划分得更为明确,制定了各种区域对应的故障判定原理及方法,利用分布式决策保护策略,确定了微网关联区域保护方案及IED保护流程,并通过PSCAD/EMTDC仿真结果验证了本保护的有效性。