提出一种配电网可靠性快速评估算法以解决重复遍历网络拓扑的问题。以开关元件为界形成配电系统元件分区和负荷分区。提出建立元件等级和开关层级以直接判断动作保护元件的位置，结合高度稀疏的等效支路连接矩阵快速分析负荷与电源及备用电源之间的可达性，建立等效负荷故障后果模式列表。采用序贯蒙特卡罗模拟，根据元件所属分区搜索负荷故障类型，统计故障停电次数和停电时间，计算可靠性指标。分别以各元件分摊的负荷故障时间和系统缺供电能量辨识负荷点和系统的薄弱环节。算例验证结果表明，该算法能正确高效地计算可靠性指标，适用于复杂配电网可靠性评估。%This paper proposes a new reliability evaluation method for distribution system to solve the problem of repeatedly passing through the network topology.Element blocks and load blocks are established with switches as the boundary. Element level and switch hierarchy are proposed to determine the location of the protection elements, which can be combined with highly sparse equivalent branch connection matrix to fast analyze the accessibility between load and power or backup power to establish equivalent load failure result type list. Then the failure element is simulated in MCS and by analyzing which block it belongs to determine the type of load, the failure frequency and the failure duration time are counted to calculate reliability indices. The weak parts of load points and system are identified through the failure time and the failure power supply of related component. The reliability assessment results of the example show that the algorithm can correctly and efficiently calculate the reliability index and is suitable for complex distribution system reliability assessment.
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