| 引用本文: | 秦烨焱,王 宾,潘本仁,等.基于时域阻抗法的35 kV配电线路相间短路故障测距[J].电力系统保护与控制,2025,53(16):169-176.[点击复制] |
| QIN Yeyan,WANG Bin,PAN Benren,et al.Phase-to-phase short-circuit fault location in 35 kV distribution networks based on time-domain impedance method[J].Power System Protection and Control,2025,53(16):169-176[点击复制] |
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| 摘要: |
| 为了解决35 kV高压配电网因感知量测手段不足和分支线路复杂性引起的故障测距难题，提出一种基于单端信息的时域阻抗法。首先，针对35 kV有分支线路配电网的相间短路故障特性，建立了基于单端信息的故障测距模型，并由故障后故障回路时域微分方程构成测距方程。然后，将测距方程中的故障距离、分支电流和过渡电阻作为未知参数，采用列文伯格-马夸尔特算法(Levenberg-Marquardt algorithm, LMA)进行非线性求解。并通过逐次搜索方法，依次对线路各区段和分支进行故障定位，确定故障所在位置。最后，利用PSCAD搭建35 kV电网模型，通过算例验证所提算法的可靠性和准确性。此方法只需要变电站出口测量的相电流和相电压作为输入，无需增加额外设备，就能够实现故障距离的精确计算和故障分支的有效识别。 |
| 关键词: 时域阻抗法 35 kV配电线路 单端信息 故障测距 阻尼最小二乘法 |
| DOI：10.19783/j.cnki.pspc.241332 |
| 投稿时间：2024-10-04修订日期：2025-01-09 |
| 基金项目:国家自然科学基金企业联合基金项目资助(U23B 20117)；国网江西省电力有限公司项目资助(521820240011) |
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| Phase-to-phase short-circuit fault location in 35 kV distribution networks based on time-domain impedance method |
| QIN Yeyan1,WANG Bin2,PAN Benren3,WANG Guannan3 |
| (1. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. Department of Electrical Engineering,
Tsinghua University, Beijing 100084, China; 3. State Grid Jiangxi Electric Power Research Institute, Nanchang 330000, China) |
| Abstract: |
| To address the fault location challenges in 35 kV distribution networks caused by insufficient sensing and measurement capabilities and the complexity of branched lines, a time-domain impedance method based on single-ended measurement is proposed. First, tailored to the characteristics of phase-to-phase short-circuit faults in 35 kV branched distribution networks, a fault location model based on single-ended measurement is established. The fault location equations based on the time-domain differential equations of the post-fault loop is derived. Then, the fault distance, branch current, and transition resistance in the fault location equations are treated as unknown parameters, a nonlinear solution is obtained using the Levenberg-Marquardt algorithm (LMA). Fault localization is then performed sequentially on each line segment and branch to determine the fault location through a step-by-step search method. Finally, a 35 kV network model is built in PSCAD to verify the reliability and accuracy of the proposed algorithm. This method requires only the phase current and phase voltage measurements at the substation feeder without the need for additional equipment, and can achieve precise fault distance calculation and effective identification of the faulted branch. |
| Key words: time-domain impedance method 35 kV distribution line single-ended information fault location damping least-square method |
