基于阻抗模型故障特征匹配技术的配电网单相接地故障测距研究

A Fault Location Method for Single-Phase Grounding Fault in Distribution Network

单相接地故障是配电网最常发生的故障,准确而快速地确定配电网单相接地故障位置对排除系统故障,减少事故损失具有非常重要的作用。针对当前配电网单相接地故障精确定位问题,通过采用网络故障时测量点处的电压预存信息,同时利用故障中馈线出口处测得的零序电压和零序电流信号,提出了一种采用差分进化算法的基于阻抗模型故障特征匹配的配电网单相接地故障测距的新方法。该方法基于系统阻抗模型定义了系统故障特征适应度指标,利用枚举法确定故障分支线路,并采用差分进化算法精确定位故障位置。中石化西北油田艾丁变10 k V线路配电网仿真结果表明了所提出的配电网单相接地故障测距方法的有效性。

The single-phase grounding fault is the most common fault among all types of faults in the distribution net-work. It is of great importance to locate the single phase grounding fault accurately and quickly reduce economic losses.Aiming at the location of single-phase grounding fault in the distribution network,this paper puts forward a new fault location method which uses a differential evolution algorithm and the Impedance Model Fault Characteristics Matching Techno-logy. The proposed method uses stored fault voltage informa-tion,the measured zero sequence voltage and current signals of the feeder in the fault duration time. And the fitness index of the system fault characteristics is defined. After identifying the potential fault branches by using the enumeration method,the fault can be located accurately by using the differential evolu-tion algorithm. The detailed simulation results in a 10 k V distribution network model of the SINPOPEC West-Northern oil field is given in this paper. The simulation results suggest the validity of the proposed single-phase grounding fault location method.