基于投入并联小电阻的含多分支配电网单相接地故障行波测距方法  

Traveling wave fault location method for a single-phase ground fault of a distribution network with multiple branches based on input parallel small resistance

作　　者：陶政臣 高湛军[1] 见文号 TAO Zhengchen;GAO Zhanjun;JIAN Wenhao(Key Laboratory of Power Grid Intelligent Dispatch and Control of Ministry of Education(Shandong University),Jinan 250061,China)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东济南250061

出　　处：《电力系统保护与控制》2024年第20期38-48,共11页Power System Protection and Control

基　　金：国家电网公司科技项目资助(52060019001H)。

摘　　要：含多分支配电网拓扑结构复杂,传统算法常忽略分支,测距精度受到影响。为此,提出基于投入并联小电阻的含多分支配电网单相接地故障行波测距方法。首先,检测故障零模、线模波到达首端的时间差,投入消弧线圈处并联小电阻,利用并联小电阻产生的零模波到达首端的时刻,以及零模波到达故障点后折、反射产生的线模波到达首、末端的时刻,消除零模波波速影响。其次,定义故障判别系数,判断故障发生在主干线路或分支上,根据故障所在区段精确计算故障距离,并根据混合线路的特点对故障判别系数进行修正以适应混合线路。最后,在PSCAD仿真平台上对所述方法进行验证,结果表明所提方法可判断故障区段,精确定位故障点且耐受过渡电阻能力和抗同步误差能力强。The topological structure of a distribution network with multiple branches is complex,and the traditional algorithm often ignores the branches.This affects the ranging accuracy.Therefore,a traveling wave fault location method for a single-phase grounding fault of a distribution network with multiple branches based on parallel small resistance is proposed.First,the time difference between the zero-mode and line-mode waves of the fault reaching the first end is detected,and a small resistor is connected in parallel at the arc suppression coil.The time when the zero-mode wave generated by the parallel small resistor reaches the first end and the time when the zero-mode wave reaches the first and the end of the line-mode wave generated by the folding and reflection after reaching the fault point are used to eliminate the influence of zero-mode wave velocity.Secondly,a fault discrimination coefficient is defined to determine whether the fault occurs on the main line or branch.The fault distance is accurately calculated according to the fault section,and the fault discrimination coefficient is modified according to the characteristics of the hybrid line to adapt to the hybrid lines.Finally,the proposed method is verified on the PSCAD simulation platform.The results show that the proposed method can judge the fault section,accurately locate the fault point,and has strong resistance to transition resistance and synchronization error.This work is supported by the Science and Technology Project of State Grid Corporation of China(No.52060019001H).

关 键 词：配电网 分支 单相接地故障 线模波 故障判别系数 混合线路 

分 类 号：TM862[电气工程—高电压与绝缘技术]