摘要
在分析小电流接地系统单相接地故障暂态零序电流特征基础上,提出将近似熵法应用于故障区段定位中。首先主站进行线路不同区域发生故障和线路不发生故障情况模拟,计算出所有情况下的不同故障指示器零序电流近似熵值和相邻检测点近似熵值比,分别设定首段故障阈值和区内故障阈值。求取故障线路所有检测点零序电流近似熵值和熵值比,将熵值比和熵值分别与设定的区内故障阈值和首尾故障阈值比较,进行故障区段定位。最后通过MATLAB/Simulink搭建10kV小电流接地系统单相接地故障仿真模型进行验证。仿真结果证明,上述方法能够有效进行故障区段定位,且不易受接地电阻、故障初相角等复杂因素的影响。
On the basis of analyzing the characteristics of transient zero sequence current of single-phase grounding fault in small current grounding system, the approximate entropy method was applied to fault section location. First, the master station simulated the failures in different areas of the line and the line without failures, calculated the approximate entropy value of the zero sequence current of the different fault indicators and the approximate entropy value ratio of the adjacent detection points under all conditions, and set the first fault threshold and the zone fault threshold respectively. The approximate entropy value of the zero sequence current of all the detection points of the fault line and the approximate entropy value ratio of the adjacent detection points were obtained. And then, the entropy value ratio and entropy value were compared with the set fault threshold and the first and last fault threshold respectively to locate the fault section. Finally, a 10kV low-current grounding system single-phase grounding fault simulation model was built through MATLAB/Simulink for verification, which proves that this method can effectively locate the fault section and is not easily affected by complex factors such as grounding resistance and the initial phase angle of the fault.
作者
陈新岗
刘新宇
马志鹏
崔炜康
CHEN Xin-gang;LIU Xin-yu;MAZhi-peng;CUI Wei-kang(School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China)
出处
《计算机仿真》
北大核心
2023年第1期112-117,409,共7页
Computer Simulation
基金
重庆市教委基金资助项目(KJ1709225)
国家电网公司科技项目(SGTYHT/19-JS-215)。
关键词
小电流接地系统
单相接地故障
近似熵
区段定位
阈值
Low current grounding system
Single phase to ground fault
Approximate entropy
Segment targeting
Threshold
