| 引用本文: | 韦莉珊,贾文超,焦彦军.基于5次谐波与导纳不对称度的配电网单相接地选线方法[J].电力系统保护与控制,2020,48(15):77-83. |
| WEI Lishan,JIA Wenchao,JIAO Yanjun.Single-phase fault line selection scheme of a distribution system based on fifth harmonic and admittance asymmetry[J].Power System Protection and Control,2020,48(15):77-83 |
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| 摘要: |
| 配电网发生单相接地故障后，故障线路与非故障线路三相对地参数的不对称程度存在显著差异。基于该特征差异定义了线路故障后的导纳不对称度参数，提出了一种运用导纳不对称度参数作为判据的故障选线方案。该方案配合5次谐波原理，解决了中性点经消弧线圈接地系统故障线路与非故障线路故障差异消失的问题，使该判据适用于不同类型的系统。理论分析以及PSCAD仿真结果表明：该方法无需设置动作门槛，灵敏性较高，且导纳不对称度参数抗过渡电阻能力较强，可作为现有选线判据的有效补充。 |
| 关键词: 配电网 单相接地故障 故障选线 导纳不对称度 5次谐波 |
| DOI：DOI: 10.19783/j.cnki.pspc.191169 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(51877084)；中央高校基本科研业务费专项资金项目资助(2016MS87) |
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| Single-phase fault line selection scheme of a distribution system based on fifth harmonic and admittance asymmetry |
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WEI Lishan, JIA Wenchao, JIAO Yanjun
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(Department of Electrical Engineering, North China Electric Power University, Baoding 071003, China)
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| Abstract: |
| After a single phase-to-ground fault occurs in a distribution network, the asymmetrical degree of three-phase-to-ground parameters between fault line and non-fault line is significantly different. Based on this characteristic difference, an admittance asymmetry parameter is defined and a fault line selection scheme based on it is proposed. By combining the principle of the fifth harmonic, the scheme solves the problem such that the fault difference between fault line and non-fault line disappears in resonant grounding system. This makes the criterion suitable for different types of system. The theoretical analysis and PSCAD simulation result show that the method does not need to set the action threshold and has high sensitivity. The admittance asymmetry parameter also has strong ability to resist transition resistance. It can be used as an effective supplement to the existing line selection criteria.
This work is supported by National Natural Science Foundation of China (No. 51877084) and Fundamental Research Funds for the Central Universities (No. 2016MS87). |
| Key words: distribution network single phase-to-ground fault fault line selection admittance asymmetry fifth harmonic |
