考虑导线换位的特高压同塔双回线路故障精确测距方法  

Accurate Fault Location Method for Ultra-High Voltage Double-Circuit Lines on Same Tower with Considering Conductor Transposition

作　　者：张健康 林军[2,3] 粟小华 胡勇 

机构地区：[1]西北电网有限公司,西安市710048 [2]福建工程学院,福州市350108 [3]福州大学电气工程学院,福州市350108

出　　处：《电力建设》2014年第9期46-52,共7页Electric Power Construction

基　　金：国家电网公司科技项目(NWG-DD-QT[2011]164);福建省自然科学基金资助项目(2008J0011);福建省科技计划重点项目(2009H003)

摘　　要：为解决因特高压同塔双回线的导线间距大、导线间的参数不同使基于序分量的故障测距产生较大误差的问题,提出基于同塔双回线故障精确计算的故障精确测距算法。对不同换位段的线路采用特征模量分解方法计算转移矩阵;将故障网络矩阵和各换位段的矩阵相乘得到两端母线至故障点的转移矩阵;用实测数据计算的故障前、后的电压和电流相量计算线路两端的系统阻抗矩阵和等值电源电势;求解方程得到线路两端故障后的电压和电流相量。由计算结果可知:当设定的故障距离和故障电阻网络与实际值相等时,线路两端故障后的电压和电流各相量实测值与计算值的实部和虚部的误差平方和为极小值;提高搜索实际故障距离和故障电阻网路的速度可以减少计算量。Because of the large interval between conductors in ultra-high voltage （UHV） double-circuit lines on same tower, the different parameters between conductors caused the larger error of fault location algorithm based on sequence component. To solve this problem, an accurate fault location algorithm for double-circuit lines on same tower was proposed based on accurate fault calculation. The transfer matrix of different transposition block was calculated by eign-analysis method, the transfer matrix of different transposition blocks and the fault resistance matrix of fault point was composed to get transfer matrix between fault points to both end buses, the system impedances matrix and equivalence electric potentate of both buses were calculated by actual measured voltage and current phasors before fault and after fault, then the equations were solved to get phasors of voltage and current of both ends. The results show that when the tentative fault distance and fault resistances were equal to the actual values, the sum of error-squares for real part and image part between calculated phasors and actual measured phasors was the minimum value; the calculating load could be reduced by the tactic of ferreting actual fault distance and fault resistances.

关 键 词：特高压 同塔双回线 故障测距 换位 

分 类 号：TM71[电气工程—电力系统及自动化]