上海交通大学学报

上海交通大学学报

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基于时-频行波全息映射的有源配电网故障定位方法（网络首发）

  

  1. 1. 长沙理工大学电网防灾减灾全国重点实验室2. 南方电网科学研究院有限责任公司
  • 基金资助:
    国家自然科学基金（52037001，52177070）； 湖南省自然科学基金（2021JJ30729）； 中国南方电网有限责任公司科技项目（YNKJXM20210175）； 湖南省研究生科研创新项目（CX20230893）资助项目；

Fault Location Method for Active Distribution Networks Based on Holographic-Mapping of Time-Frequency Traveling Waves

  1. （1. State Key Laboratory of Disaster Prevention and Reduction for Power Grid, Changsha University of Science and Technology, Changsha 410114, China；2. Electric Power Research Institute, China Southern Power Grid, Guangzhou 510663, China）

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摘要： 现有一些配电网故障定位方法过于依赖时域或频域信号的局部波头信息，定位鲁棒性较差且难以适应有源配电网日益凸显的“双高”特征。为此该文分析了能有效避免新能源接入引起波形畸变的行波时间和频率范围，揭示该范围下行波波形与故障位置之间一一对应的全息映射关系；构建特定时间窗和频率窗的故障行波时-频矩阵，并基于波形特征全息映射匹配技术提出一种有源配电网故障定位方法，通过挖掘矩阵能量幅值偏差累加趋势与故障点位置之间的比例关系实现了故障精确定位。仿真测试和真型试验表明，该方法能有效摆脱新能源接入以及架空-电缆线路混联等配电网复杂结构对故障定位的影响，灵活地将故障定位问题转化为时-频行波波形全息映射匹配问题，提高有源配电网故障定位的准确性和鲁棒性。

关键词: active distribution network, traveling wave, fault location, time-frequency analysis, holographic-mapping

Abstract: Certain existing fault location methods for distribution networks rely too much on the local wave head information of the time or frequency domain signals, with poor location robustness and difficulty in adapting to the increasingly prominent "double-high" characteristics of active distribution networks. For improvement, the traveling wave (TW) time and frequency ranges that can effectively avoid waveform distortion caused by new energy access are analyzed. The one-to-one holographic-mapping relationship between the TW waveforms in these ranges and the fault positions is revealed. A fault TW time-frequency matrix with specific time and frequency windows is constructed, and an active distribution network fault location method is proposed based on the holographic-mapping matching technique of waveform features, which realizes the accurate fault location by exploring the proportionality between the cumulative trend of the matrix energy amplitude deviation and the fault point position. Simulation tests and real field model experiments show that the method is not affected by the complex structure of distribution networks such as new energy access and overhead-cable line mixing on fault location, and flexibly transforms the fault location problem into a time-frequency TW waveform holographic-mapping matching problem, which improves the accuracy and robustness of the fault location for active distribution networks to a degree.

Key words: 有源配电网, 行波, 故障定位, 时-频分析, 全息映射

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