Online cable fault ranging method by double-end traveling wave for underground distribution network
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摘要: 为了解决采用传统经验模态分解的电缆故障测距方法存在的频带混叠问题，以及基于总体平均经验模态分解的电缆故障测距方法受残留白噪声影响等问题，提出了一种基于补充总体平均经验模态分解的井下配电网电缆故障在线双端行波测距方法。该方法通过补充总体平均经验模态分解提取双端故障行波线模分量的固有模态函数，利用基于瞬时频率突变和模极大值的奇异性检测原理进行行波波头标定，从而实现故障点定位。通过在PSCAD/EMTDC环境下搭建基于频变特性电缆线路的6 kV井下配电网模型并进行仿真，验证了该方法测距精度高，最大测距误差不超过4%。
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关键词:
- 井下配电网 /
- 电缆故障定位 /
- 电缆故障测距 /
- 补充总体平均经验模态分解 /
- 行波测距
Abstract: In order to solve problems of block overlap of frequency bands in cable fault ranging method based on empirical mode decomposition and effect of residual white noise in the one based on ensemble empirical mode decomposition, an online cable fault ranging method by doubleend traveling wave for underground distribution network was proposed which was based on complementary ensemble empirical mode decomposition (CEEMD). The method extracts intrinsic mode function of line model components of doubleend fault traveling wave by CEEMD, and uses singularity detection principle based on instantaneous frequency mutation and modulus maxima to demarcate the wave head, so as to realize fault location. A 6 kV underground distribution network model was built in PSCAD/EMTDC software which was based on frequency characteristic of cable line. The simulation result shows the method has high ranging precision, and the max ranging error is no more than 4%. -
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期刊类型引用(8)
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