【作者】 王茜；

【导师】 柳春光；

【作者基本信息】 大连理工大学 ， 防灾减灾工程及防护工程， 2012， 硕士

【摘要】 电力系统是生命线工程的重要组成部分之一,在国民经济中起着举足轻重的作用。随着经济的发展,电力系统逐渐向着大型化和高压化发展,电力系统的覆盖范围越来越大,结构越来越复杂。并且电力系统中包含了大量的地震易损性极高的高压电气设备。这些特点导致电力系统极易在地震中遭受到破坏。在历次震害中,电力系统都有不同程度的损坏,有的甚至导致整个电力系统的瘫痪,给国家经济造成了巨大的损失,也给震后抗震救灾工作带来了较大的困难。因此对电力系统抗震可靠性分析和脆弱性评估是目前生明线工程界的一个重要课题。本文针对电力系统的抗震可靠性和脆弱性评估进行了全面的研究,本文研究的主要内容有：(1)介绍了本文的研究背景,回顾了以往的国内外学者在电力系统网络抗震可靠性分析方面的研究现状和取得的成果,并对未来的发展趋势做出了展望。(2)电力系统是一个庞大而复杂的系统,为了便于对其进行网络分析研究,我们需要根据其各部分之间的逻辑关系和一定的原则对其进行简化,把电力系统的地理接线图简化为由节点和链路组成的网络模型。此基础上添加一定的基本假定和地震动参数,就可以形成相应的电力系统地震分析模型。(3)介绍了高压电气设备的抗震可靠度计算方法,在此基础上给出了变电站和发电厂的主接线系统的抗震可靠度的计算方法。(4)在节点单元的抗震分析的基础上,应用Monte Carlo法结合Warshall算法计算电力系统的连通可靠性。应用Monte Carlo法对电力系统进行进行随机模拟,近似地再现电力系统中各节点在地震中的破坏情况。针对以往的网络连通性分析的方法的缺点,提出了应用计算二元关系传递闭包的Warshall算法计算系统的连通性矩阵,编制了相应的程序。该算法结合计算机的存贮技巧,解决了节点失效的问题,非常适用于大型复杂系统的连通可靠性计算。经过实例的验证,证明了该算法的准确和高效,(5)在电力系统的脆弱性评估方面做出了初步的探讨,建立了两种地震脆弱性评估模型,从不同的角度对电力系统的脆弱性进行了评估。经过实例的检验和对比,得到了比较满意的结果,并得出结论：在地震作用下,离源点较近,度数较大且连接边数较多的节点的脆弱性一般较大。所以需要加强对这些节点的监测和维护,并采取相应的抗震加固措施,提高电力系统的供输电能力。更多还原

【Abstract】 The electric power system is an important part of lifeline systems of Modern society. It plays an important role in the national economy. Whether it can work normally is directly related to the conduct of people’s life and the development of social economy. With economic development, the electric power system gradually toward the development of large-scale and high pressure. The coverage of the electric power system is increasing and the structure of it is more and more complex, and the system contains a large number of high voltage electrical equipments with high seismic vulnerability. These features lead to the electric power system can easily be suffered in the earthquake destruction. In the previous earthquake damage, the electric power system have varying degrees of damage and some damage even lead to paralysis of the system。 This damage has caused huge losses to the national economy, and brought great difficulties to the earthquake relief work after the earthquake. Thus seismic reliability analysis and vulnerability assessment of electric power system is a significant subject for the lifeline engineering at the moment.In this paper, seismic reliability analysis and vulnerability assessment of electric power system are studied thoroughly. The main contents are as follows:1. This paper Introduces the research background of this paper, reviews the past results achieved by domestic and foreign scholars in the seismic reliability analysis of electric power system and make the outlook for the future development trend.2. Power system is a large and complex system. In order to facilitate its network analysis, we need to simplify geographical wiring diagrams into a network model consisting of nodes and links according to certain principles and the logical relationship between its parts.Some basic assumptions and ground motion parameter was added to the network model, based on which Seismic analysis model of electric power system is built.3. Introduce the calculation methods of seismic reliability for high voltage electrical equipments. Based on it, calculation methods of the seismic reliability of high-voltage substation and high-voltage power plants are given.4. Based on the seismic analysis of the node unit, The Monte Carlo method combined with the Warshall algorithm was applied to calculate seismic reliability of electric power system. This paper applies Monte Carlo method for stochastic simulation for electric power system in order to reproduce the destruction of each node unit of the system in the earthquake. For the shortcomings of past connectivity analysis algorithms, this paper proposes the use of Warshall algorithm instead of the previous algorithms to calculate the network connectivity matrix and compile the corresponding program. The algorithm combines computer storage techniques to solve the problem of node failure is applicable to connectivity and the reliability of the large and complex network systems. Example has proved that the algorithm is accurate and efficient.5. We make preliminary study in the electric power system’s vulnerability assessment. Two seismic vulnerability assessment models were made to assess the vulnerability of electric power system from different perspectives. Through examination and comparison of examples, we obtained satisfactory results and concludes:the nodes which is closed to source point and has a high degrees are more vulnerability in the earthquake destruction. Therefore, we need to strengthen the monitoring and maintenance of these nodes and take the appropriate seismic strengthening measures to improve the electric power system transmission capacity.更多还原