| 摘要: |
| 相模变换是实现三相耦合电力系统故障分析的基础。相模变换矩阵结构的差异性将直接影响故障辨识的快速性、准确性和基于单一模量进行故障类型辨识的有效性。针对现有相模变换提取的模故障分量不能反映所有故障类型的问题，提出一种可反映全类型电缆故障的故障分量相模变换矩阵。首先，基于电缆的物理结构，对电缆进行故障暂态特征模量分析，总结各等效导体间的耦合特征。然后，结合均匀换位电缆线路参数的数学特征，提出一种可反映全类型电缆故障的故障分量相模变换矩阵，并分析各模量的传输路径和衰减特性。最后，以某配网系统为例，在PSCAD中进行仿真验证。结果表明：所提解耦矩阵能有效解耦电缆系统，解耦出的单一模量即可以反映电缆的全故障类型，且波速度稳定、衰减小，适用于电缆测距。 |
| 关键词: 相模变换 电缆线路 故障检测 行波测距 |
| DOI：10.19783/j.cnki.pspc.240482 |
| 投稿时间：2024-04-21修订日期：2024-10-30 |
| 基金项目:国家自然科学基金项目资助(U23B20117) |
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| A phase-mode transformation matrix for reflecting all types of cable faults |
| WANG Zhi1,WANG Bin2 |
| (1. Yantai Xiaoheng Yunwei Electric Power Technology Co., Ltd., Yantai 264000, China; 2. National Key Laboratory of New
Power System Operation and Control (Department of Electrical Engineering, Tsinghua University), Beijing 100084, China) |
| Abstract: |
| Phase-mode transformation is fundamental for fault analysis in three-phase coupled power systems. The structural differences in phase-mode transformation matrices directly affect the speed and accuracy of fault identification, as well as the effectiveness of single-mode fault type classification. To address the issue that existing phase-mode transformations fail to extract modal fault components that reflect all fault types, this paper proposes a phase-mode transformation matrix for fault components capable of representing all types of cable faults. First, based on the physical structure of the cables, a transient fault characteristic analysis is conducted to summarize the coupling characteristics between equivalent conductors. Then, considering the mathematical characteristics of uniformly transposed cable line parameters, a fault component phase-mode transformation matrix that reflects all cable fault types is proposed. The transmission paths and attenuation characteristics of each mode are also analyzed. Finally, a case study based on a distribution network system is conducted, and simulation verification is performed in PSCAD. The results show that the proposed decoupling matrix can effectively decouple the cable system, allowing a single extracted mode to reflect all cable fault types while maintaining stable wave velocity and minimum attenuation, making it suitable for cable fault location. |
| Key words: phase mode transformation power cable fault detection fault location based on travelling wave |
