考虑故障暂态信号衰减特性的分布式行波测距
DOI:
作者:
作者单位:

1.国网江苏省电力有限公司检修分公司;2.国网浙江省电力有限公司温州供电公司

作者简介:

通讯作者:

基金项目:

国网江苏省电力有限公司科技项目(J2019117)


Distributed Traveling Wave Fault Location Considering Fault Transient Signal Attenuation Characteristics
Author:
Affiliation:

1.Maintenance Branch Company, State Grid Jiangsu Electric Power Co.,Ltd.;2.State Grid Zhejiang Electric Power Company Wenzhou Power Supply Company

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    高压电网在电压过零点附近或过渡电阻较大的情形下发生故障时,产生的故障暂态信号微弱,衰减明显,波头检测困难,传统故障测距方法易失效。针对该问题提出一种考虑故障暂态信号衰减特性的分布式行波测距方法。首先,根据电流行波随传输距离的指数衰减规律,确定电流行波测量单元的最大布置间距;其次,基于电流行波首波头各频率分量幅值衰减特征,利用故障区间和非故障区间两端频率分量幅值比差异实现故障区间辨识;最后,基于故障区间两侧三个测点的电流行波到达时刻进行故障精确定位。在PSCAD/EMTDC中建立了IEEE30节点系统的仿真模型,仿真结果表明:所提方法不受故障类型、故障电阻、故障初相角的影响,且定位精度高、可靠性好。

    Abstract:

    When a fault occurs in a high-voltage power network near the voltage zero-crossing point or with a large transition resistance, the generated fault transient signal is weak and the attenuation is obvious. It is difficult to detect the wave head, and the traditional fault ranging method is easy to fail. To solve this problem, a distributed traveling wave effective fault location method considering fault transient signal attenuation is proposed. First, according to the exponential decay law of the current traveling wave with the transmission distance, the maximum arrangement distance of the current traveling wave measurement unit is determined under weak faults. Second, based on the attenuation characteristics of the frequency components of the first wave head of current traveling wave, the fault interval identification is realized by the difference of amplitude ratio of frequency components between fault interval and healthy interval. Finally, the faults are accurately located by using the arrival time of the current traveling waves at the three measuring points on both sides of the fault interval. The simulation model of IEEE 30-bus system is set up in PSCAD/EMTDC,and the simulative results show that the proposed method is not affected by the fault type, fault resistance, and fault initial phase angle, and has high positioning accuracy and ideal reliability.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:2020-09-10
  • 最后修改日期:2020-11-17
  • 录用日期:2020-11-23
  • 在线发布日期: