配电自动化对于提高供电可靠性具有重要意义，本文研究了在实现了配电自动化的条件下，配电系统供电可靠性的评估，所作的工作主要包括： 面向配电系统供电可靠性评估，建立了复杂配电网的简化模型，并将配电网分解为一些内部不含有操作元件的最小配电区域，以最小配电区域而不是以单个元件为单位设置故障进行供电可靠性分析，从而大大提高了分析的效率。 分析了母线故障、开关故障、断路器及熔断器发生拒动等对供电可靠性的影响，并且在配电系统供电可靠性评估中综合考虑了上述影响。 根据当前各供电企业计划检修的实际安排特点，在配电系统供电可靠性评估中，以各配电线路为单位设置检修，并考虑了母线及主变压器计划检修的情形，评估结果更加符合实际情况。 采用VC＋＋6.0编写了文献[36]中提出的，在故障、检修和过负荷情况下，以甩负荷总量最小为目标函数，以配电系统中各个元件的电气极限容量和继电保护电流整定值为约束条件的配电网络重构算法程序。 在上述工作的基础上，研究了综合考虑通过配电自动化进行配电网络重构条件下的配电系统供电可靠性评估方法。 采用VC＋＋6.0实现了包含全部上述内容的配电系统供电可靠性评估应用软件，采用典型算例进行了测试和验证，并与传统供电可靠性评估方法进行了比较，结果表明：提出的方法是可行的，并具有更高的计算效率，且能够考虑更多的影响因素。

Distribution Automation (DA) is of great importance for increasing reliability of distribution systems. The approach to evaluate reliability for distribution systems under the condition of DA is investigated in this thesis. A simplified model of complicated distribution system for reliability evaluation is established. A distribution system is divided into many distribution parts. In each part, there is no operational apparatus. In the process of reliability evaluation, faults are set for each part instead of individual apparatus, thus the calculation efficiency is remarkably improved. The influences on reliability due to faults on buses and switches and malfunction of circuit breakers and fuses are analyzed and included in the reliability evaluation. In accordance with the practice of utilities, the scheduled maintenance is set on each feeder instead of each apparatus in the reliability evaluation. Besides, the maintenance on buses and transformers are considered. The sub-program realizing the network reconfiguration with the index of minimal load shielding and the constraint condition of capacity limitation and current settings of electrical apparatus under the conditions of faults, maintainence and being overload is complished on VC＋＋6.0. Based on above works, an approach to reliability evaluation considering network reconfiguration by DA is described. The software of reliability evaluation for distribution systems consisting of all proposed methodologies is programmed on VC＋＋6.0, which is tested, verified and compared with conventional method by typical examples. It is concluded that the proposed approach is feasible and has the advantages of higher efficiency and more factors can be considered. Comparisons applied in the distribution automation system in Lintong county. The results of testing show that the proposed methods are feasible and that the program is satisfied.