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谐振接地配电网对地绝缘参数双端谐振测量新方法
作者:
作者单位:

1.智能电网运行与控制湖南省重点实验室(长沙理工大学),湖南省长沙市 410114;2.广东电网有限责任公司江门供电局,广东省江门市 529000

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基金项目:

国家自然科学基金资助项目(51807012);湖南省自然科学基金资助项目(2019JJ50645);湖南省教育厅科学研究资助项目(18K047)。


A Novel Double-terminal Resonance Measurement Method of Insulation Parameters to Ground for Resonance Grounding Distribution Network
Author:
Affiliation:

1.Hunan Province Key Laboratory of Smart Grids Operation and Control (Changsha University of Science and Technology), Changsha 410114, China;2.Jiangmen Power Supply Bureau of Guangdong Power Grid Co. Ltd., Jiangmen 529000, China.

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51807012), Hunan Provincial Natural Science Foundation of China (No. 2019JJ50645) and Scientific Research Project of Hunan Province Education Department (No. 18K047).

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    摘要:

    为解决谐振接地配电网对地绝缘参数测量过程中电压互感器漏阻抗和中性点对地支路阻尼电阻导致的测量误差问题,提出了谐振接地配电网对地绝缘参数双端谐振测量新方法。采用双电压互感器,通过消弧线圈内部电压互感器或零序电压互感器向配电网注入变频恒流特征信号,并从另一电压互感器测量返回的特征频率电压信号,对含阻尼电阻的零序谐振回路进行等效变换,搜索准确的系统谐振频率,实现了系统对地电容和对地泄漏电导的精确测算。该测量方法的电流注入与电压测量单元共同直接作用于对地绝缘参数支路,从原理上消除了电压互感器漏阻抗和系统阻尼电阻的影响,大幅提升了对地绝缘参数测量精度。在PSCAD/EMTDC仿真环境及某变电站10 kV侧对提出的对地绝缘参数实时测量技术进行了仿真分析与现场实验验证。分析结果表明,该方法测量精度高,且参数测量过程安全快捷、操作简便,不影响配电网正常供电。

    Abstract:

    In order to solve the measurement error problem of measuring insulation parameters to ground for resonance grounding distribution network caused by the leakage impedance of voltage transformer and damping resistance of branch for neutral point to ground, a novel dual-terminal resonance measurement method of insulation parameters to ground for resonance grounding distribution network is proposed. This method utilizes dual voltage transformer. A characteristic constant current signal with variable frequency is injected into distribution network through the internal voltage transformer of the arc-suppression coil or zero-sequence voltage transformer while the returned characteristic-frequency voltage signal is measured by another. After the equivalent transformation of zero-sequence resonant circuit with damping resistance, the system capacitance to ground and leakage conductance can be accurately calculated by correctly searching the resonant frequency of the system. Both the current injection and the voltage measuring unit of the proposed method directly act on the branch of insulation parameters to ground which eliminates the effect of the leakage impedance of voltage transformer and damping resistance and greatly improve the measurement accuracy of insulation parameters to ground. The proposed real-time measurement technology of insulation parameters to ground is simulated, analyzed and verified by field test in PSCAD/EMTDC simulation environment and 10 kV substation. The analysis results show that the proposed method has high measurement accuracy, whose parameters measuring process is safe, fast and easy to operate, and with no impact on the normal power supply of distribution network.

    表 5 Table 5
    表 2 端口等效导纳幅值变化趋势Table 2 Amplitude variation trend of equivalent admittance on port
    表 1 端口等效导纳相位变化趋势Table 1 Phase variation trend of equivalent admittance on port
    表 6 Table 6
    图1 谐振接地配电网拓扑Fig.1 Topology of resonance grounding distribution network
    图2 电压互感器等值电路Fig.2 Equivalent circuit of voltage transformer
    图3 测量方案1的特征频率信号零序等效电路Fig.3 Zero-sequence equivalent circuit of characteristic frequency signal in measuring scheme 1
    图4 测量方案2的特征频率信号零序等效电路Fig.4 Zero-sequence equivalent circuit of characteristic frequency signal in measuring scheme 2
    图5 对地绝缘参数精确测量方法流程图Fig.5 Flow chart of precise measurement method for insulation parameters to ground
    图 配电网零序等效电路导纳幅值曲线图Fig. Amplitude variation curve of equivalent admittance in distribution network
    图 配电网零序等效电路导纳相位曲线图Fig. Phase variation curve of equivalent admittance in distribution network
    Fig. Measurement results of capacitance to ground by different measurement methods图B3不同阻尼电阻值下不同测量方法的对地电容测量结果
    图 不同阻尼电阻值下不同测量方法的对地泄漏电导测量结果Fig. Measurement results of leakage conductance to ground by different measurement
    图 对地绝缘参数测量现场实验接线图Fig. Experimental wiring diagram
    表 4 Table 4
    表 7 Table 7
    表 3 现场实验测量结果Table 3 Field experiment measurement results
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引用本文

喻锟,邹豪,曾祥君,等.谐振接地配电网对地绝缘参数双端谐振测量新方法[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190523001.
YU Kun,ZOU Hao,ZENG Xiangjun,et al.A Novel Double-terminal Resonance Measurement Method of Insulation Parameters to Ground for Resonance Grounding Distribution Network[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190523001.

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  • 收稿日期:2019-05-23
  • 最后修改日期:2020-04-26
  • 录用日期:2020-02-04
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