一种10 kV配电网的相间短路故障定位方法
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摘要
针对当配电网线路相间短路故障点前存在分支负荷时,阻抗法难以准确定位的问题,提出二次定位算法以减小相间短路故障定位的误差。首先,对阻抗法原理进行分析,对故障类型进行判别。然后,通过一次定位算法对故障点进行定位,当故障点前存在分支负荷时,结合线路拓扑结构对一次定位结果进行修正。最后,通过算例分析,对二次定位算法的可行性及准确性进行了检验。研究结果表明:故障距离在20 km内时,二次定位算法的定位误差小于1 km,误差率小于10%,定位精度高,具有良好的工程实用性。
In view of the problem that when there was a branch load before interphase short-circuiting fault point in the distribution network line,the result of impedance legal position had large deviation,a secondary positioning algorithm was put forward to reduce the position error of the phase-phase short circuit faultly.Firstly,the fault types were identified by analyzing the principle of impedance method.Then,the fault point was located by the one-time location algorithm. When there was branch load before the fault point,the fault result was corrected by combining with the line topology. Lastly,the feasibility and accuracy of secondary position algorithm were analyzed by calculation example.The reslts show that when the fault distance is within 20 km,the positioning error of the secondary positioning algorithrn is less than 1 km,and the error rate is less than 10%.The positioning accuracy is high and has good engineering practicability.
In view of the problem that when there was a branch load before interphase short-circuiting fault point in the distribution network line,the result of impedance legal position had large deviation,a secondary positioning algorithm was put forward to reduce the position error of the phase-phase short circuit faultly.Firstly,the fault types were identified by analyzing the principle of impedance method.Then,the fault point was located by the one-time location algorithm. When there was branch load before the fault point,the fault result was corrected by combining with the line topology. Lastly,the feasibility and accuracy of secondary position algorithm were analyzed by calculation example.The reslts show that when the fault distance is within 20 km,the positioning error of the secondary positioning algorithrn is less than 1 km,and the error rate is less than 10%.The positioning accuracy is high and has good engineering practicability.
引文
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[12] 黄佳乐,杨冠鲁.配电网故障区间定位的改进矩阵算法[J].电力系统保护与控制,2014,42(11):41-45.
[13] 吴明伟,詹跃东,肖开伟.线路结构及参数对阻抗法二次定位结果的分析[J].软件,2017,38(9):132-136.
[14] 刘飞飞,张宇舟,孟得姣,等.微电网电压混成控制[J].河南科技大学学报(自然科学版),2017,38(4):48-53.
[15] 于盛楠,鲍海,杨以涵.配电线路故障定位的实用方法[J].中国电机工程学报,2008,28(28):86-90.
[2] 康忠健,田爱娜,冯艳艳.含DG配电网故障测距技术综述[J].电网与清洁能源,2013,29(4):6-12.
[3] 陈玥云,覃剑,王欣,等.配电网故障测距综述[J].电网技术,2006,30(18):89-93.
[4] 黄彦全,肖建,李晋,等.最小二乘法在距离保护中的应用初探[J].继电器,2004,32(7):17-20.
[5] 刘家军,李春举,李文玲.在故障测距中应用故障分量电流的阻抗法研究[J].电气化铁道,2003(5):1-4.
[6] 戴志辉,王旭.基于改进阻抗法的有源配电网故障测距算法[J].电网技术,2017,41(6):2027-2034.
[7] 杨凌霄,牛惠平,张伟,等.基于双端阻抗法的配电网故障定位研究[J].工矿自动化,2008(5):30-32.
[8] 白小奇.输电线路阻抗法故障测距应用分析[J].电气开关,2012,50(4):81-82,85.
[9] 康忠健,田爱娜,冯艳艳,等.基于零序阻抗模型故障特征的含分布式电源配电网故障区间定位方法[J].电工技术学报,2016,31(10):214-221.
[10] 陈蕾,庄晓丹,苏毅方.基于故障指示器信号的配电线路故障定位算法实现[J].中国电业(技术版),2015(8):15-18.
[11] 郑顾平,姜超,李刚,等.配网自动化系统中小电流接地故障区段定位方法[J].中机工程学报,2012,32(13):103-109,197.
[12] 黄佳乐,杨冠鲁.配电网故障区间定位的改进矩阵算法[J].电力系统保护与控制,2014,42(11):41-45.
[13] 吴明伟,詹跃东,肖开伟.线路结构及参数对阻抗法二次定位结果的分析[J].软件,2017,38(9):132-136.
[14] 刘飞飞,张宇舟,孟得姣,等.微电网电压混成控制[J].河南科技大学学报(自然科学版),2017,38(4):48-53.
[15] 于盛楠,鲍海,杨以涵.配电线路故障定位的实用方法[J].中国电机工程学报,2008,28(28):86-90.