| 引用本文: | 李泽文,颜勋奇,肖仁平,王梓糠,穆利智.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方法[J].电力自动化设备,2020,40(8): |
| LI Zewen,YAN Xunqi,XIAO Renping,WANG Zikang,MU Lizhi.Fault location method based on slope of transient current waveform for flexible mid-voltage DC distribution line[J].Electric Power Automation Equipment,2020,40(8): |
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| 摘要: |
| 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。 |
| 关键词: 直流配电网 故障定位 暂态电流 切线斜率 故障判别 |
| DOI：10.16081/j.epae.202007007 |
| 分类号:TM77 |
| 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) |
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| Fault location method based on slope of transient current waveform for flexible mid-voltage DC distribution line |
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LI Zewen1, YAN Xunqi1, XIAO Renping2, WANG Zikang1, MU Lizhi1
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1.The Grid Security Monitoring Technology Engineering Research Center of the Ministry of Education, Changsha University of Science and Technology, Changsha 410076, China;2.Jiangmen Power Supply Bureau, Guangdong Power Grid Co.,Ltd.,Jiangmen 529000, China
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| Abstract: |
| In order to improve the safe and stable operation capability of MV(Mid-Voltage) DC(Direct Current) 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 slope of transient current waveform is inversely proportional to the position of fault. The positive and negative voltage gradients are used to determine the fault type and the fault pole, and the fault distance can be calculated by using the tangent slope of the transient current waveforms at both ends of the line for different fault types. The simulative results of PSCAD/EMTDC verify the effectiveness and accuracy of the proposed method, which can accurately locate the fault point under different fault types, different fault distances and different transition resistances. |
| Key words: DC distribution network fault location transient current tangent slope fault discrimination |
