配电网系统中 ,在向专线用户或综合负荷供电的分支馈线与主干馈线交接处 ,常装有特殊形式的隔离开关。针对这种实际情况 ,目前基于变结构耗散网络理论的故障定位和隔离算法存在无谓扩大故障切除区域的问题。通过引入虚拟开关概念 ,对上述特殊形式的隔离开关进行建模 ,并在此基础上提出了基于变结构耗散网络理论的故障定位和隔离改进算法。算例分析表明 ,该改进算法可以充分发挥此类特殊形式隔离开关的操作灵活性 ,从而实现故障定位及隔离的最小化 In the distribution network system, a special form of isolation switch is often installed at the junction of the branch feeder and the trunk feeder that supply the green subscriber or the integrated load. In view of this actual situation, the fault location and isolation algorithm based on the variable structure dissipative network theory has the problem of unnecessarily expanding the fault removal area. By introducing the concept of virtual switch, the above special form of isolation switch is modeled, and based on this, a fault localization and isolation improvement algorithm based on variable structure dissipative network theory is proposed. The case study shows that this improved algorithm can give full play to the operational flexibility of such special form of isolation switch, so as to minimize the fault location and isolation