应用于含有线-缆混合线路配电网的行波故障测距新方法
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A novel traveling wave fault location method applied to distribution networks with hybrid line composed of overhead line and cable
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    摘要:

    故障行波波头的准确辨识是提高配电网行波故障测距精度的关键因素之一,文中提出基于改进希尔伯特-黄变换(HHT)的行波波头标定方法,首先利用自适应噪声的完全集合经验模态分解(CEEMDAN)方法对故障信号进行分解,再利用希尔伯特变换求取高频固有模态函数分量的瞬时幅值,根据瞬时幅值的突变点确定行波波头的到达时刻。针对配电网的单一线路,利用该方法标定行波波头后,采用D 型测距原理实现测距;针对线-缆混合线路,提出了基于接点时差的双端测距原理实现故障测距。对不同故障时间、故障位置、接地电阻等情况的故障进行仿真实验,结果表明,该方法可精确标定行波波头,且具有较高的测距精度。

    Abstract:

    Due to the accurate identification of wave front can improve accuracy of travelling wave fault location in distribution network, the paper used improved Hilbert-Huang transform to discern the travelling wave front, firstly, used the complete ensemble empirical mode decomposition with adaptive noise to decompose fault signal, then got instantaneous amplitude of high-frequency intrinsic mode function components by using Hilbert transform. The wave front could be recognized by the breakpoint of instantaneous amplitude. After using the above methods to discern the travelling wave front,for uniform line,used type D measuring distance technology to realize distance measurement, for hybrid line composed of overhead line and cable, fault location could be realized by utilized the two terminal method based on the difference of travelling wave propagation time at each connection point. Through simulations, the proposed method can be verified to locate the fault accurately and reliably in the case of different fault resistance, different fault location, different fault time and etc.

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侯丽钢,汤向华,江辉,刘辉,范乐松.应用于含有线-缆混合线路配电网的行波故障测距新方法[J].电力工程技术,2019,38(2):111-116

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历史
  • 收稿日期:2018-11-07
  • 最后修改日期:2018-12-27
  • 录用日期:2018-06-19
  • 在线发布日期: 2019-03-28
  • 出版日期: 2019-03-28