基于损失功率匹配的配电线路故障定位方法

Fault Location Method for Distribution Lines Based on Loss Power Matching

配电网现阶段仍存在有一定数量的低、非自动化线路,缺少馈线终端等自动化装置,故障定位困难。针对此问题,提出一种基于损失功率匹配的配电线路故障定位方法。首先,分析故障后跳闸开关与线路损失功率之间的对应关系,提出故障定位原理,并阐明其工程可行性;其次,通过超短期负荷预测判断线路是否发生异常功率损失并计算线路损失功率,通过短期负荷预测计算故障时线路各开关的应载功率;最后,将线路损失功率值与各开关功率值进行匹配,从而定位故障引起的跳闸开关的位置,确定故障区段。仿真算例及工程实例的分析结果表明:所提方法能够快速有效定位故障区段,缩小抢修范围,且不依赖配电网自动化系统,适用于非自动化和自动化程度低的配电线路。

It is difficult to locate faults in the distribution lines with low automation or non-automation which lack automation devices such as feeder terminals.For this problem,a fault location method for distribution lines based on loss power matching is proposed.First,the corresponding relationship between the trip switch and the power loss of the line is analyzed to put forward the principle of fault location,and the engineering feasibility is expounded.Then,the abnormal power loss of the line is judged and the line loss power is calculated by ultra-short-term load forecasting.Finally,the line loss power value is matched with each switch power value to locate the position of the trip switch caused by the fault and determine the fault section.The analysis results of simulation and engineering examples show that this method can quickly and effectively locate the fault section and reduce the scope of emergency repair.In addition,as the method does not rely on the distribution network automation system,it is especially suitable for low-automated and non-automated distribution lines.