| 摘要: |
| 提出了一种基于电流行波S变换样本熵的快速纵联保护新方法。利用故障后一段时间内线路两端故障电流行波的S变换样本熵比值来识别区内外故障。区外故障时，一侧的反行波和另一侧前行波为同一行波，波形相似，对应电流行波样本熵基本相同，其比值接近1。区内故障时，线路一侧的反行波和另一侧前行波为不同行波，波形相似度小，线路两端电流行波样本熵差异较大，其样本熵之比(数值小的与数值大的之比)最小。利用此特征可以确定线路区内外故障。仿真结果表明，所提出的纵联保护方案能够快速识别区内外故障，其性能不受故障类型、故障初始角、接地电阻、故障位置和母线结构的影响。 |
| 关键词: 输电线路 纵联保护 故障行波 S变换 样本熵 |
| DOI：10.7667/PSPC150972 |
| 投稿时间：2015-06-10修订日期：2015-10-08 |
| 基金项目:人工智能四川省重点实验室项目(2013RYY01，2012RYY06，2014RYY05，2015RYY01);自贡市科技局项目(2012D08) |
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| A new pilot protection principle based on S-transform sample entropy |
| WU Hao |
(School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China;School of Automation and
Electronic Information Engineering, Sichuan University of Science & Engineering, Zigong 643000, China) |
| Abstract: |
| A new method of pilot protection based on S-transform sample entropy of current traveling wave for transmission lines is proposed, the ratio of S-transform sample entropy of fault current traveling wave at both ends of transmission line within a period of time after the occurrence of the fault is used to identify the internal and external fault. For the external fault, the forward traveling wave on the side and the backward traveling wave on the other side of transmission line are the same traveling wave, and the waveform is similarity, sample entropies of the corresponding current traveling wave are approximately equal to each other, so the ratio is close to one. For the internal fault, the forward traveling wave on the side and the backward traveling wave on the other side of transmission line are different, and the waveform is weak similarity, sample entropies of the corresponding current traveling wave have great differences, and the ratio is less than that of the external fault. According to these characteristics, a fault can be identified as internal or external one. The simulation result shows that the internal and external fault can be distinguished rapidly by the method presented in this paper, and its performance is not affected by fault types, fault inception angle, grounding resistance, fault location, and bus configuration. |
| Key words: transmission lines pilot protection fault traveling wave S-transform sample entropy |
