基于多目标加权灰靶决策的有源配电网故障区段定位方法

分布式电源接入配电网后,现有利用单一故障特征信号的集中式定位方法难以可靠定位故障区段.针对这一问题,提出一种基于多目标加权灰靶决策的分布式故障区段定位方法.通过分析分布式电源接入对单相接地故障电流的影响,选取分别归一化的区段内等值电阻、区段暂态零模电流波动量、衰减速度及零序电流差作为区段状态评价指标,计算各区段采样数据...

Location method of an active distribution network fault section based on multi-target weighted grey target decision

When distributed generators are connected to a distribution network, the existing centralized fault location method based on single-fault-characteristic finds it difficult to locate the fault segment reliably. Thus a distributed fault section location method based on multi-objective weighted grey target decision is proposed to help solve this problem. By analyzing the influence of distributed generation on the single-phase ground fault current, the normalized equivalent resistance and the fluctuation quantities of the transient zero-mode current in the section, the attenuation speed and the difference of zero-sequence current are selected as the evaluation indices of the section state. The target distance of the sampling data of each section under the three decision results of the healthy section, the upstream section of the fault point and the fault section are calculated respectively to determine whether the section is a fault section. PSCAD/EMTDC simulation results show that the proposed method can integrate diverse fault characteristics, and that it is suitable for locating the fault section of a radial distribution network with IIDG under different fault conditions.This work is supported by the Science and Technology Project of State Grid Corporation of China (No. SGHADK00PJJS1900078).