基于两种算法融合的接地极线路故障测距  

Fault Location for Grounding Electrode Line Based on Fusion of Two Algorithms

作　　者：张怿宁[1] 束洪春[2] 翟永昌[1] 田鑫萃[2] 董俊[2] 李晋伟[1] 

机构地区：[1]中国南方电网超高压输电公司检修试验中心,广州510663 [2]昆明理工大学电力工程学院,昆明650051

出　　处：《高电压技术》2016年第8期2633-2641,共9页High Voltage Engineering

基　　金：国家自然科学基金(U1202233;51267009)~~

摘　　要：由于接地极线路的特殊结构,极址点的极址电阻很小,仅依靠一种测距原理对接地线路进行故障测距,往往很难做到在全线长范围内的测距精度都达到工程要求。为此搭建了±800 k V直流接地极线路仿真模型,对接地极线路故障进行仿真计算。理论分析和大量仿真表明:采用直流分量,并由量测端电压和电流推算至故障点并根据故障点电压相等构建测距函数的测距算法对于越靠近极址点的故障位置,测距精度相对越精确;而采用谐波分量,并根据故障点纯电阻的特性列写测距函数的测距算法,其近端故障测距的精度较高,且有一定的耐受过渡电阻的能力。基于此,提出了将2种测距方法融合的新故障测距方法。一方面,2种测距算法可以相互校验,提高测距的可靠性;另一方面,在一定程度上克服了单一原理故障测距算法不能耐受高阻和远距离的缺点。仿真数据的测距结果表明,该融合故障测距算法,在全线长范围内均有较好的测距精度。Because the grounding electrode line has a special line structure, the pole addressing resistance is very small. It is difficult for fault location accuracy to meet the engineering requirements only by one fault location method. Consequently, we established the ~800 kV DC grounding pole line simulation model, grounding electrode line fault is simulated. Theoretical analysis and simulation results show that the fault location based on DC component which is constructed according to the fault point voltage calculated by the measured end voltage and current is relatively more accurate when the fault point is near the pole point. Fault location based on harmonic components is constructed according to characteristic of the fault point pure resistance. It is more accurate when the fault point is near the measuring end and it can withstand a certain transition resistance. So a new fault location method is proposed which is based on the fusion of these two methods. On the one hand, the two algorithms can check each other and improve the reliability of fault location. On the other hand, the algorithm overcomes the shortcomings of single principle fault location algorithm which cannot tolerate high resistance and long distance to a certain extent. Fault location results of simulation data show that the fusion fault location algorithm has the high accuracy of locating fault.

关 键 词：接地极线路 故障测距 直流分量 谐波分量 融合 

分 类 号：TM721.1[电气工程—电力系统及自动化]