基于改进相关系数法的农村配电网故障区段定位方法  

The Fault Section Location Method Used in the Rural Distribution Networks Based on Improved Correlation Coefficients

作　　者：莫莉[1] 黎曜 龚庆武[2] 

机构地区：[1]贵州电网公司培训与评价中心,贵阳550002 [2]武汉大学电气工程学院,武汉430072

出　　处：《中国农村水利水电》2015年第1期137-142,共6页China Rural Water and Hydropower

基　　金：国家科技支撑项目(2013BAA02B01)

摘　　要：为解决传统相关系数法在对农村配电网故障进行区段定位时,由于采样不同步造成的算法不可靠问题,提出了一种改进的故障区段定位新方法,该方法通过时窗平移法减小采样不同步带来的影响,提高了相关系数法的可靠性。通过对故障暂态零序电流信号求周期和值比,并根据周期和值比与设定阈值的关系,将线路监测点分为两种类型,其中大于阈值的进行相关性分析,从而大大减小了计算量。仿真结果表明,故障区段定位准确性高,稳定性好,定位结果不受故障角、故障距离、过渡电阻和故障类型的影响,且利于实际现场中故障位置的查找。To solve the problem of algorithm unreliability caused by the unsynchronized sampling when locating the rural distribution fault section by using the traditional correlation coefficient,an improved fault section location method is proposed in this paper.The method which employs the time window shift to reduce the impact caused by the unsynchronized sampling has improved the reliability of correlation coefficients.By calculating the cycle sum ratio of the fault transient zero-sequence current signal,and dividing the line monitoring points into two types according to the relation of cycle sum ratio and the assumed threshold,the calculation is greatly simplified after we use the cycle sum ratio of fault section greater than the assumed threshold to conduct a correlation analysis.The simulation results show that the method proposed in this paper has high accuracy and good robustness,and that the location result is insensitive to the fault phase,fault distance,grounding resistance and fault types,and is conducive to locating the fault point in the practice.

关 键 词：故障区段定位 相关系数 周期和值 暂态零序电流 

分 类 号：TM926[电气工程—电力电子与电力传动]