| 引用本文: | 王 玲,邓 志,马 明,王 昕,杨冬海.基于状态估计残差比较的配电网故障区段定位方法[J].电力系统保护与控制,2021,49(14):132-139.[点击复制] |
| WANG Ling,DENG Zhi,MA Ming,WANG Xin,YANG Donghai.A method for locating fault sections in distribution networks based on the comparison of state estimation residual errors[J].Power System Protection and Control,2021,49(14):132-139[点击复制] |
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| 摘要: |
| 针对单端量测的阻抗法在多分支辐射状网络中会出现伪故障点的问题，利用网络中分布的智能量测设备提供的监测信息，提出了基于状态估计残差比较的配电网故障区段定位方法。该方法首先遍历所有节点通过添加故障支路建立不同节点故障网络下的状态方程；其次通过求解状态估计方程获得含网络所有节点的总残差检测值序列；然后搜寻最大残差检测值所在节点判断故障节点位置；最后根据节点相邻区间首末端阻抗角相位变化差异判定故障区间。大量仿真表明，该方法在不同故障类型、过渡电阻等工况下均具有良好的故障定位效果。该方法考虑了量测产生的随机变量成分，利用测量数据的互补性和多源性，在一定程度上提高了不同量测数据误差的抗干扰能力，极大地缩小了配电网在有限量测条件下的故障查找范围。 |
| 关键词: 配电网 故障定位 加权最小二乘法 残差比较 状态估计 阻抗角 |
| DOI：DOI: 10.19783/j.cnki.pspc.200438 |
| 投稿时间：2020-06-22修订日期：2021-03-15 |
| 基金项目:国家自然科学基金项目资助(51907134)；南方电网科技项目资助(SGSW0000GHJS1900107) |
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| A method for locating fault sections in distribution networks based on the comparison of state estimation residual errors |
| WANG Ling1,2,DENG Zhi1,2,MA Ming1,2,WANG Xin3,YANG Donghai3 |
| (1. Guangdong Power Grid Co., Ltd. Electric Power Research Institute, Guangzhou 510080, China; 2. Key Laboratory of
Power Quality of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China; 3. Shenzhen
Zhongdian Power Technology Co., Ltd., Shenzhen 518040, China) |
| Abstract: |
| In order to solve the problem of pseudo-fault points in fault location in a distribution network with radial networks based on the single terminal impedance method, a fault section location method based on residual comparison of state estimation is proposed. This is based on the monitoring information provided by distributed intelligent measurement equipment in the network. This method first traverses all nodes and establishes the state equations of different node fault networks by adding faulty branches. Secondly, the total residual detection value sequence containing all nodes of the network is obtained by solving the state estimation equation. Then the faulty node is identified by detecting the node with the maximum residual detection value. Finally, the fault section is determined according to the phase difference of impedance angle between the head and the end of adjacent sections. A large number of simulations show that the proposed method produces good fault location with different fault types, transition resistance and other working conditions. The method takes into account the random variable components generated by the measurement, and uses the complementarity and multi-sources of the measurement data of different attributes to improve to some extent the anti-interference ability of different measurement data errors. This greatly reduces the fault finding range of the distribution network under limited measurement conditions.
This work is supported by the National Natural Science Foundation of China (No. 51907134) and the Science and Technology Project of China Southern Power Grid (No. SGSW0000GHJS1900107). |
| Key words: distribution network fault location weighted least squares residual comparison state estimation impedance angle |
