引用本文: | 张耘浩,张 姝,张文海,肖先勇.基于台区变压器二次侧电压变化的配电网故障区段定位[J].电力系统保护与控制,2022,50(16):23-32.[点击复制] |
ZHANG Yunhao,ZHANG Shu,ZHANG Wenhai,XIAO Xianyong.Fault section location of a distribution network based on voltage variation of thesecondary side of a transformer in the station area[J].Power System Protection and Control,2022,50(16):23-32[点击复制] |
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摘要: |
随着配电网精品台区的建设,越来越多的监测装置向台区低压侧延伸,为配电网的故障定位提供了新的思路。提出了一种基于台区变压器二次侧电压变化的配电网故障区段定位方法。分析了配电网发生故障后的台区变压器侧的电压变化规律,利用故障路径与非故障路径下监测点三相电压幅值变化差异辨识故障区段。通过采用改进的最近邻聚类法,在电压监测集合中辨识出距离故障不同位置的监测点集,能够对监测信息进行快速的分区。该方法不需要10 kV线路的监测数据,仅需要配电台区10 kV/0.4 kV变压器低压侧电压幅值变化信息,监测采集装置安装维护方便。通过大量仿真表明,该方法能够适应不同中性点的接地方式、故障类型和过渡电阻,具有较强的适用性。 |
关键词: 配电网 电压监测装置 故障区段定位 变电站二次侧 改进的近邻聚类法 |
DOI:DOI: 10.19783/j.cnki.pspc.211438 |
投稿时间:2021-10-26修订日期:2021-12-23 |
基金项目:国家重点研发计划项目资助(2020YFF0305800);四川大学专职博士后研发基金项目资助(2019SCU12003) |
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Fault section location of a distribution network based on voltage variation of thesecondary side of a transformer in the station area |
ZHANG Yunhao,ZHANG Shu,ZHANG Wenhai,XIAO Xianyong |
(College of Electrical Engineering, Sichuan University, Chengdu 610065, China) |
Abstract: |
With the construction of high-quality distribution network stations, more and more monitoring devices are extended to the low-voltage side of the distribution network, providing new ideas for fault location on the distribution network. This paper presents a method for locating fault sections of a distribution network based on voltage changes on the secondary side of transformers in the station area. It analyzes the voltage change law on the transformer side of the distribution network after a fault occurs, and uses the difference between the three-phase voltage amplitude changes at the monitoring point under the fault path and the non-fault path to identify the faulty section. It uses an improved nearest neighbor clustering method to identify the set of monitoring points at different locations from the fault in the voltage monitoring set. This can quickly partition the monitoring information. This method does not require 10 kV line monitoring data, but only needs 10/0.4 kV transformer low-voltage side voltage amplitude change information in the distribution station area. The monitoring collection device is easy to install and maintain. A large number of simulations show that the method can adapt to different neutral grounding methods, fault types and transition resistances, and has strong applicability.
This work is supported by the National Key Research and Development Program of China (No. 2020YFF0305800). |
Key words: distribution network voltage monitoring device fault section location secondary side of substation nearest neighbor clustering algorithm |