说明：  在简单的支路始末端节点数据输入的基础上确定配电网拓扑结构表，经过遍历深度优先搜索形成层次结构和节点队列以决定潮流计算的节点顺序。
(Whole story in a simple slip end nodes determined on the basis of data input distribution network topology table, after traversing depth-first search form hierarchy and node queue to determine the order flow calculation nodes.)