电力企业信息化新技术研究―数据仓库

在研究现阶段电力企业信息化存在的问题的基础上,介绍了数据仓库技术在电力系统中的应用,提出以企业级数据仓库为数据中心,描述了电力企业基于数据仓库策略的信息系统模型的总体设计;最后为电力企业数据仓库维度模型的设计给出了具体解决方案和应用实例分析。     

数据仓库技术在电力营销决策支持系统的应用

分析了在电力企业建设电力营销决策支持系统的必要性,以设计实例给出了基于数据仓库技术的电力营销决策支持系统的框架结构模型及数据仓库的建模技术,并重点介绍了OLAP技术和数据挖掘技术.     

一种电力企业辅助决策系统的信息处理模型

以数据仓库技术为基础,提出了具有数据层、分析层和管理层三层结构的信息处理模型,并对三层结构进行了详细分析。该模型为解决电力企业信息弧岛问题和建立电力企业辅助决策系统提供了有效的解决方案。     

基于SOA的电力系统实时数据仓库技术研究

随着电力信息化的发展,传统数据仓库已经不能满足电力企业决策的需要,而实时数据仓库扩展了传统数据仓库的适用范围,能给电力企业提供关于日常操作的技术支持。讨论了实时数据仓库的几种实现方案,提出了可行的基于SOA的实时数据仓库体系结构,并针对电力系统实时数据仓库进行了设计。     

电力系统数据仓库Web服务的研究与设计

围绕电力系统数据仓库对外提供的Web服务,结合电力企业数据仓库系统进行了应用分析,总结出目前数据仓库系统需要向外界提供的服务,研究了电力数据仓库系统Web服务的实现技术,提出了基于SOA的数据仓库Web服务解决方案,为电力企业的信息化集成提供了便利。     

电力企业信息集成平台中数据集成模型研究

随着电力信息化水平的不断提高,电力企业信息化建设中信息孤岛问题日益突出,实现流程集成、应用集成和数据集成是电力企业信息化建设的必然任务。结合目前流行的数据集成理论,提出了一种基于数据仓库和中间件集成平台,来满足不同的数据需求,对各个组件进行了详细描述,指出其优势和意义。     

基于工作流及集成中间件技术的电力信息一体化设计及实现

随着电力行业的发展,电力企业中不同管理部门中不同结构、相互独立的多个异构信息系统越来越希望整合成一个一体化的信息管理平台,以提供统一的开发、维护和管理,并实现各级系统间有效的数据、资源和功能共享。文中介绍了开发的电力企业信息一体化平台,重点介绍了基于可扩展标记语言(XML)的数据交换平台,基于工作流引擎管理并遵循企业Java组件模型／公共对象请求代理体系结构(EJB／CORBA)结构的电力业务集成和基于虚拟数据仓库的智能决策系统的设计和实现方案。实际应用表明,该方案实现了电力企业中各级业务系统间数据的互操作性、应用间的协调性,为企业的一体化经营和管理提供了科学的决策依据。     

一种采用实时分区实现实时数据仓库的方法

数据仓库和实时数据库技术已成功应用于电力企业,但目前两者在实际应用中各自独立,使得两者的数据处理能力都受到一定的限制,特别是数据仓库因其静态稳定性,无法完成实时数据应用处理。分析了数据仓库维度事实表的特点,通过设计出新的实时分区同静态数据仓库链接方式,建立实时数据仓库,并在电力企业数据仓库实际规划中考虑PI实时数据库系统特点,将已有的静态数据仓库和实时数据库纳入到新型数据仓库体系结构中,构建出高效平台以改善数据仓库处理实时应用的能力。     

基于人因的电力企业安全生产态势评估模型

针对目前造成电力企业生产事故的主要原因人因隐患,提出了基于人因的电力企业安全生产态势评估模型,为电力企业的安全生产管理提供参考依据。采用数据统计和专家建议相结合的方法,设计具有评分标准的人因评价指标体系;以改进的模糊层次分析法为基础,建立模糊判断矩阵,分析各指标的权重系数;以结果集和隶属度函数为依据,对电力企业安全等级进行全面评估。通过对某电力企业实际数据的处理以及安全态势评估,验证了该模型的正确性。本模型适用于基于人因的电力企业安全生产态势评估,通过安全隶属度值,对企业安全度进行预测。     

基于数据仓库的电力企业客户关系管理

介绍了客户关系管理(CRM)的基本原理,并分析了电力市场环境下的电力企业开展CRM的特殊性和必要性以及其特点和内涵。给出了电力企业基于数据仓库的客户关系管理实现方案。所设计CRM系统符合J2EE(Java 2 Enterprise Edition)技术规范。还讨论了电力企业建立数据仓库的必要性,分布式数据库系统客户信息同步的策略,客户分析的主要内容及适用的数据挖掘方法等内容。     

一种电力云数据中心的任务调度策略

随着智能变电站一体化监控平台及通信信息平台的建设与发展,电力数据呈现爆炸式的增长,而现有电力数据中心在处理海量数据时效率不高,无法满足电力用户多服务质量(QoS)需求。通过对电力云数据中心设计方案的分析,研究了云数据中心的任务调度策略。结合电力数据中心自身的特点,定义了一种电力用户多QoS评价模型,给出一种基于负载均衡的贪心算法,并以QoS总体效应值为目标进行任务调度。最后,以变电设备状态评估实验中心为例,对其故障诊断、状态评估、检修维护等任务进行模拟调度,并使用CloudSim平台进行仿真测试。结果表明,该算法能最大限度地满足电力用户多QoS需求,有效提高电力数据中心运行的效率,达到更加优越的负载均衡效果。     

Application of information system technologies to power control centers in a liberalized environment

This paper describes the new control centers that are incorporated with information system technologies to handle precise security margins on a wide level and secure information exchange between system operators and other actors emerging in the liberalized electric power supply environment in progress. To further realize the system stress analysis by high‐speed processing, symmetric multi processor (SMP) servers are adopted through cost‐effective performance from the standpoint of investment protection. The performance improvements and observations are shown with processing time measurements according to the peculiarity of the power system analysis software packages embedded in the client‐server‐based energy management system (EMS). To cope with malicious intrusions into the cyber space through data links with outside information systems, an information exchange method using tough Internet protocol (IP) separation between information system and control system portions is also presented using a practical example, with cyber security strictly maintained among the other internal information systems in an electric power utility. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Simulation study of QoS guaranteed ATM transmission for futurepower system communication

The asynchronous transfer mode (ATM) will support communication services with both constant and variable bit rate, for example, data, voice, video transmissions and, of particular note, multimedia applications combining those service components. However, many problems are required to be solved in order to apply this technique to an electric power company's network. Electric power companies are required to transmit very important information, such as information regarding electric power control. The transmission of this important information is required to have very high quality. Therefore, if the important information and the general information were switched in the same manner, the stringent QoS (quality of service) required for the important information could not be guaranteed. The authors examine the QoS of future utility communications which include ATM-native teleprotection signals, inter-LAN data communications and video conference communications. First, they propose a more accurate model which can be expressed by a multi-state Markovian process for computer data communication traffic. Second, the implementation of a priority control scheme in an ATM switch is proposed to guarantee the QoS of important power system communications. Finally, computer simulations are used to clarify the effectiveness of priority control and the feasibility of future ATM-based utility telecommunication networks     

基于Web服务的电力企业实时信息应用集成

分析了电力企业实时应用各异构系统间难以共享信息的现状.基于Web服务技术设计了能提供业务服务、应用服务、客户服务和编制服务等多种服务的标准化的松耦合的一体化电力实时信息应用集成框架,应用Web服务提供通用基础架构支持,使用基于知识库的编制服务实现SCADA、EMS、DMS等实时应用系统间的实时信息互通和互操作.集成框架...     

A broadband wide-area network as an enabler of improved power system maintenance

Wide-area networks (WANs) are being deployed worldwide at power utilities. By replacing vintage narrowband solutions, broadband communications can now be used for an entire utility enterprise. One new possibility that has opened up is to improve power system maintenance. During the last ten years, the benefits of adequate asset management have become increasingly clear in the power industry due to the economic pressures and aging infrastructure. An apparent tool to improve the asset-management strategies is the implementation of information technology systems that support the operational processes. The impact of these systems can be further enhanced by efficient communications, allowing the proliferation of functionality and data access. This paper describes the initial stages in analyzing the combined effects of enhanced communication and maintenance requirements. It provides a useful maintenance categorization, based on empirical data. Also, areas of improvement for power system maintenance are elucidated together with the benefit of enhanced communications.     

基于电子地图的中国动力用煤与电站锅炉设备数据管理信息系统设计

针对动力用煤煤性分析与电站锅炉设备数据量的不断增加,用传统纸质存储与手工查询方式已困难重重,为此设计了基于电子地图的动力用煤与电站锅炉设备数据管理信息系统,该系统可以现代技术手段（Internet）向管理部门和科研人员提供及时、完整、可靠的动力用煤与电站锅炉设备信息。     

市电畸变情况下三相UPS的一种锁相方法

锁相性能是衡量UPS性能的一个重要指标.在市电畸变情况下.传统的过零检测鉴相方法容易得到错误的相位信息而导致锁相环失锁.提出一种基于瞬时功率理论的二相UPS锁相方法.该方法通过消除瞬时功率的直流分量达到锁相目的.该锁相环带有正序分量检测环节,能够在市电电压不平衡情况下,实现对其基波正序分量的锁相.对锁相环模型进行了分析,确定了环路滤波器参数的选取原则.系统由32位TMS320F2812型DSP实现全数字化控制.实验结果表明了该锁相系统的良好性能.     

CIM extensions to electrical distribution and CIM XML for the IEEE radial test feeders

The electric power utility is an extremely large enterprise and has many computer systems and applications to complete both business and engineering functions. An efficient information exchanging and sharing infrastructure is key to the success of an electric utility. To facilitate the integration, a common data model is needed as a common language by which systems and applications can talk with each other. This research focuses on creating a common data model for the electrical distribution. It extends the CIM to electrical distribution for the data requirements by the distribution power flow and proposes modified models for distribution lines, distribution loads, and some specific distribution devices. It converts the IEEE radial test feeders to distribution CIM-based XML documents and provides an initial reference model for the electric distribution data in CIM XML format. These CIM XML documents have been tested and reviewed by industrial contacts. More tests are encouraged to check the interoperability of the proposed model and created CIM XML documents of the IEEE radial test feeders.     

基于独立成分分析预测电站锅炉NOx排放量

为了解决燃煤电站锅炉低NO_x燃烧特性建模输入值高维数据众多,以及大样本处理造成模型运行速度慢、精度低的问题,将独立成分分析（ICA）应用到建模数据预处理领域,提出一种基于快速独立成分分析（FastICA）的BP（back propagation）神经网络建模方法,并用该方法对某220 MW热电机组NO_x排放浓度进行预测。研究结果表明：经FastICA降维预处理后所建的神经网络模型（ICA-BP）性能优于直接构建的神经网络（BP）模型;ICA-BP模型计算结果与实测结果相对误差仅约2.5%,说明ICA方法有助于实现降低维数的同时保留更多原始数据特性的目的,是系统建模数据前处理的有效工具。