高速公路特长隧道应急救援预案

以五女峰隧道为例,在确定了特长隧道应急预案总原则的前提下,提出了五女峰特长隧道灾害事故预案的编制,分别介绍了火灾、交通堵塞、突发安全事故发生情况下的应急预案。     

完善库什塔依水电工程的安全体系 树立绿色环保示范电站新形象

库什塔依水电工程建设中始终把安全生产工作放在首位,以"完善大安全管理体系,夯实安全管理基础,打造流域开发绿色环保示范新形象"为目标,坚持"安全第一,预防为主、综合治理"的工作方针和"以人为本"的管理理念,采取多项措施,建设流域开发绿色环保示范电站新形象。自工程开工以来,未发生任何安全伤亡事故,实现了安全生产"零事故"的目标。     

基于最优乘子潮流估计的故障筛选与排序

提出了一种用于电压稳定安全评估的快速故障筛选和排序方法。该方法从故障前的临界点出发,通过最优乘子潮流法计算得到的故障后边界点来估计故障后临界点,当初始点接近临界点,通过一次迭代即可满足所需的计算精度,从而快速地识别出非严重故障。对于严重故障和某些特殊情况的故障进行了分析并提出了解决办法,保证了对严重故障的估计精度。通过某一实际703节点系统算例验证了该方法的有效性。     

一种基于线路相关集的事故预想新算法

根据故障切除后负荷转移的情况进行事故预想,防止接连事故的发生,是确保电力系统安全稳定的重要措施。为此,提出了线路相关集的概念和基于最短路径算法的线路相关集搜索方法,给出了线路相关因子的求解办法。在此基础上对预想事故后的潮流转移进行快速计算,准确地判断出过负荷线路。用CEPRI36节点系统进行了仿真验证,证明了所提方法的正确性和有效性。     

应用电力仿真软件PSS/E计算网络可用传输能力

可用输电能力(ATC)是指导电力市场交易的重要指标,对系统规划与运行具有重要影响;PSS/E是一种有效的机电暂态分析软件,利用其快速的潮流计算功能及扩展接口可进行ATC指标的计算分析,为电网规划与系统分析人员提供便利。引入ATC指标的定义及主要解算方法,详细分析了PSS/E软件基于直流潮流和交流潮流的ATC计算模型和流程,以及用于N-1故障严重性排序的两种行为性指标。针对IEEE30节点系统算例进行比较分析,计算结果表明了软件ATC指标计算和应用的可行性。     

基于N-k故障的地区电网脆弱性评估

电力系统N-k故障与电网中的脆弱环节有着紧密的联系,脆弱性评估已成为预防连锁故障的热门课题。为了辨识这些脆弱故障路径,在功能组分解的基础上,提出N-k故障路径搜索方法及其概率模型。引入效用理论来定义故障严重度函数,并基于熵值法和层次分析法对各项风险指标加权得到系统N-k故障综合风险指标。根据路径风险脆弱性和结构脆弱性函数,进一步提出适用于电网N-k故障的脆弱性指标,用以定量分析故障路径以及电网整体的脆弱程度。将该算法应用在河南某一地区电网,指出其中的脆弱线路和节点。仿真分析表明:与单一考虑风险的脆弱度评估方法相比,考虑了结构重要度的风险脆弱性评估的准确度更高,评估结果对电网监控亦更有意义。     

基于IRBFNN和PCA的电网预想故障安全运行评估方法研究

为了更快速直观地监视、分析和评估故障后电网的安全运行状态,提出了基于径向基函数(radical basis function,RBF)神经网络和主成分分析法(principal component analysis,PCA)的评估模型。利用带衰减因子的吸引力传播(affinity propagation,AP)聚类算法选择RBF神经网络中心和隐含层节点数,同时提出了扩展的电网运行状态安全评估指标,利用越限指标权重和指数阶数避免了安全评估的遮蔽现象,利用主成分分析选取RBF神经网络的输入矢量特征,最后通过IEEE-30节点仿真算例验证了所提模型的有效性。     

IDENTIFYING SYSTEM FUNCTIONS

This article provides certain fairly rigorous, although still heuristic, methods for identifying the functional components of systems in such a way as to facilitate making relationships between the components and the overall system. Based on the definitions of function commonly used, making such a relationship is not always as easy as it could be made. Specific matters discussed herein include the following: functions and objectives-oriented thinking; logical versus physical thinking; functional outputs versus functional objectives; functional objectives versus system mission; directness of relationship to an objective; relationships between multiple functional objectives; distinguishing specific objectives within more general ones; the need to develop a consistent set of terms; etc.     

Statistical Independence as Linear Independence

A contingency table summarizes the conditional frequencies of two attributes and shows how these two attributes are dependent on each other. Thus, this table is a fundamental tool for pattern discovery with conditional probabilities, such as rule discovery. In this paper, a contingency table is interpreted from the viewpoint of granular computing. The first important observation is that a contingency table compares two attributes with respect to the number of equivalence classes. The second important observation is that matrix algebra is a key point of analysis of this table. Especially, the degree of independence, rank plays a very important role in extracting a probabilistic model from a given contingency table.     

Business Continuity Management: A Standards-Based Approach

ABSTRACT

Business enterprises are increasingly realizing the importance of business continuity management (BCM). Availability BS 25999 Standard has facilitated a consistent methodology that organizations can follow in designing their BCM System. This paper intends to provide a conceptual understanding of BCM right from BCM Policy to BCM maturity by describing the steps involved in the implementation of BCM Standard – BS 25999 – to ensure business continuity in the event of an outage. The key BCM tasks have been categorized into three phases of business continuity – Pre-event Preparation, Event Management, and Post-event Continuity. This paper also highlights some of the challenges experienced by the author in carrying out Risk Assessment and Business Impact Analysis. The Business Continuity Maturity Model® of Virtual Corporation is provided (with their permission) as a tool to strengthen business continuity maturity or organizations.