【作者】 赵月辉；

【导师】 颜秋容；

【作者基本信息】 华中科技大学 ， 电力系统及其自动化， 2011， 硕士

【摘要】 配电系统与用户直接相连,其故障会直接导致用户停电,因此其供电可靠性对用户影响很大。随着经济发展以及用户对供电质量要求的提高,配电系统规模逐渐变大,结构日趋复杂,运行方式复杂多变。以往对配电系统可靠性研究的方法存在计算时间长、计算精确度低和只适用于特定配电系统结构等问题,不能很好的适应配电系统的发展。本文针对配电系统规模大,结构复杂,运行方式灵活的特点,对配电系统的可靠性模型、可靠性计算方法及其对配电系统的规划建设的作用进行了研究。本文介绍了配电系统的基本概念及其特点,总结国内外现有的配电系统可靠性评估方法,分析各种方法的优势和缺陷。采用解析法中的故障模式后果分析法作为配电系统可靠性评估的基本方法,并给出解析法中评价配电系统可靠性的常用指标。建立了配电系统元件和系统的可靠性模型,在此基础上提出基于索引搜索算法的配电系统可靠性评估方法。算法以元件为故障枚举单位,采用搜索的方法模拟配电系统元件故障后的开关动作,从而得到负荷的停运状态,并以此为依据计算负荷的可靠性指标及配电系统的可靠性指标。算法通过索引表记录配电系统的关键拓扑结构、元件故障后的动作开关及开关的动作时间,减少了大量无效搜索,提高了搜索算法速度以及负荷停运时间的计算精确度。算法考虑了备用元件、计划检修、开关拒绝动作、多电源供电等情况,与实际配电系统运行方式相符。根据索引搜索算法开发了基于C++ Builder 6.0和Microsoft Access 2003平台的具有可视化界面的配电系统可靠性评估的软件。软件可方便地维护配电系统数据、查看元件故障后动作开关及负荷停运状态、计算配电系统可靠性指标并将计算结果导入到Microsoft Excel中。通过对RBTS Bus 6配电系统以及高速铁路配电系统进行计算,证明软件计算结果准确度高、计算速度快、并适用于多种复杂配电系统结构。根据计算结果分析配电系统可靠性薄弱点,提出配电系统结构改造方案,并计算了改造后的配电系统可靠性指标,验证了改造方案的有效性。更多还原

【Abstract】 Distribution system connects the consumer directly, its failure will lead directly to the user’s outage. Therefore, the reliability of distribution system has a great influence on consumers. With the economic development and higher requirements of power quality, distribution system scale become progressively larger, the complexity of its structure is growing, and its operation modes are complicated and variable. There are some problems in previous studies on methods of distribution system reliability, such as long calculation time, low calculation accuracy, and only suitable for specific structure of distribution. So they could not well adapt for distribution system development. Aiming at features of distribution system large scale, complex structure and variable operation mode, this paper study on distribution system reliability model, reliability algorithm, and its functions in distribution planning and construction.This paper introduces the basic concepts of power distribution system and its characteristic, summarizes the existing distribution system reliability evaluation methods and points out the advantages and disadvantages of each method. Failure effects analysis method of analytical methods is used as the basic method for the reliability evaluation of distribution system. Common distribution system reliability evaluation indices are also given in this paper. The distribution system components and system reliability model are built in this paper. On this basis, Index-Search algorithm is proposed and used for reliability evaluation of distribution system. This algorithm takes the power component as the enumeration unit, uses search method to simulate switches motion after component fault in order to get the outage status of the loads, and then calculate the reliability indices of loads and distribution system. Index tables record the key distribution system topology, action switches after component fault and action time of switches. Though these index table records, a large number of invalid searches are reduced, the speed of search algorithm and the calculation accuracy of load outage time are improved too. This algorithm takes into account the spare components, planned maintenance, refused action of switches, and multi-power supply, etc. It matches the actual distribution system operation mode.According to Index-Search algorithm, a reliability evaluation of distribution system software which has a visual interface is developed based on C++ Builder 6.0 and Microsoft Access 2003 platform. It can maintain the distribution system data conveniently, view action switches and outage status of loads after components failure, calculate distribution system indices and import them into Microsoft Excel.The tested results from RBTS Bus 6 distribution system and high-speed rail power distribution system show that this algorithm could calculate the reliability indices correctly, quickly, and well adapt for variety of complex structures of distribution system. According to the result of the weak points of distribution system, structural reform program for distribution system is proposed. The reliability indices of transformed distribution system are calculated, and the effectiveness of reform program is verified.更多还原