| 引用本文: | 陈燕擎,刘 涛,韩文建,等.考虑配电网分布式零序电流关系的单相接地故障定位[J].电力系统保护与控制,2020,48(22):118-126. |
| CHEN Yanqing,LIU Tao,,HAN Wenjian,,et al.Single-phase-to-earth fault location in distribution networks considering the distributed relations of the zero-sequence currents[J].Power System Protection and Control,2020,48(22):118-126 |
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| 摘要: |
| 配电网单相接地时故障特征弱，难以用传统的行波测距或阻抗法进行精确定位。基于配电线路的分布参数模型，充分考虑单相接地故障稳定后的分布式量测信号关系，分析零序电流、线路参数与故障位置的内在联系。依据故障点前、后的故障电流信息构造故障定位函数，并利用多测点、多时刻的量测数据，构造故障定位矩阵。将求解故障定位矩阵转化成求解与之相对应的非线性方程组的最小二乘解，使用混沌粒子群算法在故障区段内搜索故障点，实现故障精确定位。在PSCAD/EMTDC中搭建典型10 kV城市配电网模型并模拟单相接地故障，测距结果表明了方法的有效性和可靠性。 |
| 关键词: 零序电流 分布测量 配电网 单相接地故障 精确定位 |
| DOI：DOI: 10.19783/j.cnki.pspc.200045 |
| 分类号: |
| 基金项目:2017年国家重点研发计划子课题项目资助(2017YFC0804400)；江苏方天电力技术有限公司科技项目资助(KJ201914) |
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| Single-phase-to-earth fault location in distribution networks considering the distributed relations of the zero-sequence currents |
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CHEN Yanqing, LIU Tao, HAN Wenjian, ZHANG Yao, XU Qing, XU Haoyuan, LIANG Rui
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(1. Jiangsu Frontier Electrical Technology Co., Ltd., Nanjing 210000, China; 2. School of Electrical and Power
Engineering, China University Mining and Technology, Xuzhou 221116, China; 3. Jiangsu Province
Laboratory of Mining Electric and Automation, Xuzhou 221116, China)
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| Abstract: |
| Traditional traveling wave or impedance methods are not appropriate for locating single-phase-to-earth faults since the fault features are not significant. Based on the distributed parameter model of the distribution line, the relationship between the distributed measurements in the steady state after a single-phase-to-earth fault occurs is considered, and the inherent relation between zero-sequence currents, line parameters and fault location is analyzed. Given the fault currents before and after a fault, a fault location formula is created, and a fault location matrix is constructed using multi-time and multi-point measurements. By transforming the solution to the fault location matrix into the least-squares solution to the corresponding non-linear equations, accurate fault location can be estimated by searching the fault point in the fault section with a chaotic particle swarm. A typical 10 kV distribution network is established by PSCAD/EMTDC and single-phase-to-earth faults are simulated. The calculation results show the effectiveness and reliability of the proposed method.
This work is supported by National Key Research and Development Program of China in 2017 (No. 2017YFC0804400). |
| Key words: zero-sequence current distribution measurement distribution network single phase to earth fault accurate fault location |
