基于馈线树动态拓扑的高容错故障定段方法

High fault-tolerant fault segmentation method based on feeder tree dynamic topology

开关的投切和分布式电源的渗透使得配电网拓扑和运行方式复杂多变,给馈线故障定段带来挑战。提出把馈线拓扑分解为树枝和分叉区两种连接单元的馈线树故障定段法。通过智能馈线终端单元识别馈线上各开关的状态变化以实时更新馈线拓扑信息,计算树枝状态函数。根据节点共识容错判据进行故障区段可信度判断,进一步结合分叉区状态进行交叉验证。对节点信息正方向的定义以过流前潮流信息为基准,解决有源配电网故障电流的方向定义问题。最后通过算例验证所提方法的优越性。

Switching of the switch and the penetration of the distributed power make the topology and operation mode of a distribution network complex and changeable.This brings challenges to the faulty section of the feeder.A feeder tree fault segmentation method is proposed,which decomposes the feeder topology into two connection units of a branch and a forked zone.The state of each switch on the feeder is identified by the intelligent feeder terminal unit so that the feeder topology information is updated in real time.This is used to calculate the branch state function.The consensus fault-tolerant criterion is used to judge the reliability of the fault zone.Cross-validation is further performed in conjunction with the state of the bifurcation zone.The definition of the positive direction of the node information is based on the pre-current flow information.In this way the problem of defining the direction of the fault current of the active distribution network is solved.Finally,an example is given to verify the superiority of the proposed method.