| 引用本文: | 李泽文,吴国瑞,夏翊翔,等.基于虚拟故障波形匹配的行波网络定位方法[J].电力系统保护与控制,2025,53(21):84-93.[点击复制] |
| LI Zewen,WU Guorui,XIA Yixiang,et al.Traveling-wave network fault location method based on virtual fault waveform matching[J].Power System Protection and Control,2025,53(21):84-93[点击复制] |
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| 摘要: |
| 针对长距离输电行波波头精确标定困难、行波波速难以准确选取等问题，提出了一种基于虚拟故障波形匹配的行波网络定位方法。首先分析行波在输电网络中的传播特性，对传播过程各环节建立等效模型。利用改进的深度优先搜索(depth first search, DFS)算法，实现任意故障位置到测量点行波传播路径搜索。进而根据路径信息构建行波传播模型。结合动态虚拟故障思路，利用行波传播模型模拟各测量点虚拟故障行波波形。最后提出虚拟故障与真实故障行波波形自适应匹配方法，构造行波波形匹配率来衡量虚拟故障与真实故障位置的差异性。通过PSCAD仿真平台验证，该方法无需标定初始波头到达时间，降低了波速误差，实现了故障精确定位。 |
| 关键词: 虚拟故障波形 路径搜索 波形匹配 故障定位 行波 |
| DOI：10.19783/j.cnki.pspc.241410 |
| 投稿时间：2024-10-22修订日期：2025-02-12 |
| 基金项目:国家自然科学基金项目资助(52377073)；湖南省科技创新人才计划科技创新团队项目资助(2021RC4061) |
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| Traveling-wave network fault location method based on virtual fault waveform matching |
| LI Zewen1,WU Guorui2,XIA Yixiang1,DENG Feng1,LIU Guosheng1,WANG Yuanchuan1 |
| (1.Engineering Research Center of Ministry of Education for Power Grid Safety Monitoring Technology
(Changsha University of Science and Technology), Changsha 410114, China; 2.Dongguan Power
Supply Bureau, Guangdong Power Grid Co., Ltd., Dongguan 523120, China) |
| Abstract: |
| To address the challenges of accurately identifying the wavefront of travelling waves over long transmission distances and precisely determining the wave propagation velocity, a traveling-wave network fault location method based on virtual fault waveform matching is proposed. First, the propagation characteristics of traveling waves in transmission networks are analyzed, and equivalent models are established for each stage of the propagation process. An improved depth first search (DFS) algorithm is utilized to identify the traveling wave propagation path from any fault location to the measurement points. Based on the obtained path information, a traveling-wave propagation model is constructed. Using the concept of dynamic virtual faults, the model simulates the virtual fault traveling-wave waveforms at each measurement point. Finally, an adaptive matching method between virtual and actual fault traveling waveforms is proposed, constructing a matching index to quantify the differences between the virtual and actual fault locations. PSCAD simulation results verify that the proposed method eliminates the need to calibrate the initial wavefront arrival time, reduces wave velocity errors, and achieves accurate fault location. |
| Key words: virtual fault waveforms path search waveform matching fault location traveling wave |
