基于近似熵的小电流接地系统故障区段定位方法  

A novel fault location method based on the approximate entropy for small current grounding system

作　　者：王晓卫[1] 张涛[1] 田书[1] 张玉均[1] 李涛[1] 程志磊[1] 

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454000

出　　处：《中国电力》2012年第3期1-6,共6页Electric Power

基　　金：煤炭青年基金资助项目(117160);河南理工大学实验室开放基金资助项目(SKJA09034);河南理工大学SRTP训练计划资助项目(10-3-002);河南省控制工程重点学科开放实验室资助项目(KG2011-15)

摘　　要：提出了一种基于暂态零模功率近似熵的故障区段定位方法。该方法在计算出各检测点暂态零模功率近似熵值的基础上,通过求取近似熵比例因子数值与控制主站中事先设置的阈值进行比较,若该因子值大于阈值,则判定为健全区段;若小于阈值,则判定为故障区段。大量的ATP仿真实验表明,无论是中性点不接地系统还是经消弧线圈接地系统,对于任意初相角和过渡电阻值时,该方法均能有效判定出故障位置,并且在5 000Ω高阻接地故障时,仍然有良好的表现。通过比例因子之比曲线衡量阈值设定时裕度的大小,最终确定该故障定位方法在各初相角条件下的最佳性能工作区间。A new fault location method based on approximate entropy for the transient zero-mode power was proposed.In this method,the approximate entropy value of every detection point for transient zero-mode power was calculated first.The scale factor value of approximate entropy for each section was then calculated and compared to the threshold which preset in control main station.If the scale factor value is greater than the threshold,the section is determined as healthy,otherwise faulty.A large number of ATP simulation shows that fault in both ungrounded system and grounded system with arc suppression coil can be located effectively with random initial phase and transition resistance.The method has good performance even with grounding impedance as high as 5 000 ohms.According to the ratio curve of scale factor versus margin settings,the optimal working range for each initial phase was also defined.

关 键 词：暂态零模功率 近似熵 比例因子值 故障定位 阈值 

分 类 号：TM711[电气工程—电力系统及自动化] TM862