| 引用本文: | 郭谋发,郑新桃,杨耿杰,高 伟,缪希仁.利用暂态波形伸缩变换的谐振接地系统故障选线方法[J].电力自动化设备,2014,34(9): |
| GUO Moufa,ZHENG Xintao,YANG Gengjie,GAO Wei,MIAO Xiren.Faulty line detection based on transient waveform stretching transformation for resonance-grounding system[J].Electric Power Automation Equipment,2014,34(9): |
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| 摘要: |
| 谐振接地系统单相接地时，非故障线路间暂态零序电流波形的相似度高于故障线路与非故障线路暂态零序电流波形的相似度。非故障线路间的相似度主要与线路对地分布电容有关。采用2条线路对地等效电容的比值对暂态零序电流波形进行伸缩变换，以提高波形间的相似度及选线裕度。基于分段相平面分析，求出各线路伸缩变换后暂态零序电流波形的各段相平面轨迹到确定点的欧氏距离，构造可综合表征暂态零序电流波形幅值和极性信息的特征矩阵，对特征矩阵做模糊K均值聚类，选出故障线路。在噪声干扰、电弧故障、采样不同步、不同时间窗等情况下分别对所提方法进行仿真验证，结果表明所提算法适应性强，选线准确、可靠。 |
| 关键词: 谐振接地系统 谐振 接地 故障选线 暂态零序电流 伸缩变换 相平面分析 模糊K均值聚类 |
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| 基金项目:国家自然科学基金资助项目（51377023）；福建省自然科学基金资助项目（2012J01203） |
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| Faulty line detection based on transient waveform stretching transformation for resonance-grounding system |
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GUO Moufa, ZHENG Xintao, YANG Gengjie, GAO Wei, MIAO Xiren
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College of Electrical Engineering and Automation，Fuzhou University，Fuzhou 350116，China
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| Abstract: |
| When single-phase grounding fault occurs in resonance-grounding system，the similarity of zero-sequence transient current waveform between two healthy feeders is higher than that between fault and healthy feeders. The former is related mainly to the line-earth capacitance. The ratio between two equivalent line-earth capacitances is adopted in the stretching transformation of zero-sequence transient current waveform to improve the similarity between waveforms and the margin of faulty line detection. The Euclidean distance between the phase-plane trajectory of the zero-sequence transient current waveform after stretching transformation and a definite point is calculated based on the sectional phase-plane analysis. The Euclidean distances of sectional phase-planes are applied to form a characteristic matrix to represent the amplitude and polarity information of the zero-sequence transient current waveform，to which the fuzzy K-means clustering is then applied for detecting the faulty feeder. The proposed method is verified by simulations in different conditions，such as noise interference，arc-grounding fault，asynchronous sampling，varied time window size，etc. The simulative results demonstrate its higher adaptability，reliability and accuracy. |
| Key words: resonance-grounding system resonance electric grounding faulty line detection zero-sequence transient current stretching transformation phase-plane analysis fuzzy K-means clustering |
