期刊论文

Fault location method based on slope of transient current waveform for flexible mid-voltage DC distribution line

Li, Zewen(lzw0917@163.com)

中文

电力自动化设备

1006-6047

2020

40

8

88-95

10.16081/j.epae.202007007

收稿日期：2019-11-01；修回日期：2020-05-14 基金项目：国家自然科学基金资助项目（51877012）；湖南省 教育厅重点项目（18A121）；湖南省研究生科研创新项目 （CX2018B557） Project supported by the National Natural Science Foundation of China（51877012），the Key Projects of Hunan Provincial Department of Education（18A121） and Hunan Provincial Innovation Foundation for Postgraduate（CX2018B557）

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为了提高中压柔性直流配电网的安全稳定运行能力,提出了一种基于暂态电流波形斜率的中压柔性直流配电线路故障定位新方法。通过分析时域内的单极接地短路故障、双极短路故障暂态特性,发现不同故障类型下暂态电流突变点的波形切线斜率不受电容放电形式的影响,暂态电流波形切线斜率与故障点位置构呈反比例型函数关系。利用正、负极电压梯度判别故障类型与故障极,针对不同故障类型,利用线路两端故障暂态电流波形的切线斜率求解故障距离。PSCAD/EMTDC仿真结果验证了所提方法的有效性与准确性,其能够在不同故障类型、不同故障距离、不同过渡电阻的情况下精确定位故障点位置。

In order to improve the safe and stable operation capability of MV(Mid-Voltage) DC(Direct Cur-rent) distribution network, a novel fault location method based on the slope of transient current waveform for MV DC power distribution lines is proposed. The transient characteristics in the time domain of pole-to-ground and pole-to-pole faults are analyzed, by which it is found that the tangent slope of the transient point of the transient current waveform under different fault types is not affected by the form of capacitor discharge, and the tangent...