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基于零序电流波形区间斜率曲线的配电网高阻接地故障检测
作者:
作者单位:

1.电网智能化调度与控制教育部重点实验室(山东大学), 山东省济南市 250061;2.山东理工大学电气与电子工程学院,山东省淄博市 255049;3.国网河南省电力公司电力科学研究院,河南省郑州市 450052

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基金项目:

国家重点研发计划资助项目 (2017YFB0902800);国家电网有限公司科技项目(52094017003D)。


Detection of High Impedance Grounding Fault in Distribution Network Based on Interval Slope Curves of Zero Sequence Current
Author:
Affiliation:

1.Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University), Jinan 250061, China;2.College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255049, China;3.Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou, Henan 450052, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2017YFB0902800) and State Grid Corporation of China (No. 52094017003D).

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    摘要:

    配电网高阻接地故障由于故障电流微弱而难以被传统保护装置检测并排除,故障长时间存在会增加发生火灾和人身安全事故的风险。针对现有方法在面对不同接地介质等故障场景时,因故障特征的差异性及噪声干扰而导致的整定阈值难设定和检测可靠性不足等问题,基于对10 kV电网现场实测高阻故障波形的分析,采用最小二乘线性拟合描述波形非线性畸变,提出基于零序电流波形区间斜率曲线的故障检测方法。同时,采用格拉布斯(Grubbs)法抑制不规则波形畸变对区间斜率曲线的干扰,以进一步保证算法对故障特征的正确提取。所提方法具有较强的抗噪声能力,数值仿真和现场实测故障数据验证了算法的可靠性。

    Abstract:

    High impedance grounding fault (HIF) in the distribution network can hardly be detected and cleared by the traditional protection relays due to its weak fault current. The persistent existences of HIF add great risks to the fire hazards and human securities. Aiming at the problems of hard-determined setting threshold and insufficient detection reliability caused by the differences of fault features and noise interference when the existing methods are facing different grounding dielectrics and fault scenarios, a fault detection method is proposed based on interval slope curves of zero sequence current according to the curve analysis of high impedance fault tested in a 10 kV power system site, which uses least squares linear fitting to describe the nonlinear distortion of curves. Meanwhile, Grubbs method is proposed to suppress the interference with interval slopes curves from the irregular waveform distortions and further to guarantee the proper extraction of the fault features. The proposed method possesses great immunity against noise and the reliability is verified by numerical simulation and measured fault data at site.

    图1 高阻接地故障的不同波形畸变特征Fig.1 Distortion features of various waveforms for high impedance faults
    图2 基于最小二乘线性拟合的波形区间斜率Fig.2 Interval slope of waveforms based on the least square linear fitting
    图3 非故障和故障情况下零序电流区间斜率变化特征Fig.3 Variations of interval slopes in zero sequence current under fault and non-fault situations
    图4 格拉布斯法处理前后的区间斜率曲线Fig.4 Interval slope curve before and after applying Grubbs method
    图5 故障检测结果Fig.5 Fault detection results
    Fig. Network topology of the field HIF tests
    Fig. Pretreatment of the raw signal of the HIF in Fig.1(h)
    Fig. Successfully detected rate of the algorithm under different conditions
    Fig. Voltage-current characteristic curves of different types of HIFs
    Fig. Curves of interval slopes of different types of HIFs
    表 2 Table 2
    表 1 算法检测结果对比Table 1 Comparison of detection results for algorithms
    Fig. Comparisons of Anti-noise property
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引用本文

韦明杰,石访,张恒旭,等.基于零序电流波形区间斜率曲线的配电网高阻接地故障检测[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190801009.
WEI Mingjie,SHI Fang,ZHANG Hengxu,et al.Detection of High Impedance Grounding Fault in Distribution Network Based on Interval Slope Curves of Zero Sequence Current[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190801009.

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  • 收稿日期:2019-08-01
  • 最后修改日期:2020-05-08
  • 录用日期:2019-11-22
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