| 引用本文: | 李 浩,宋国兵,樊艳芳,常仲学,张 维.利用分相开关探测的配电网永久性故障识别方法[J].电力系统保护与控制,2023,51(5):11-21.[点击复制] |
| LI Hao,SONG Guobing,FAN Yanfang,CHANG Zhongxue,ZHANG Wei.Permanent fault identification method of a distribution network based ondetection using a phase segregated switch[J].Power System Protection and Control,2023,51(5):11-21[点击复制] |
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| 摘要: |
| 针对自动重合闸盲目重合于永久性故障会给配电网带来二次冲击的问题，提出了一种利用分相开关探测式重合的永久性故障识别方法。瞬时性接地故障时，线路等效为电容模型，利用暂态电压电流通过最小二乘法求出计算电容值，计算电容值与实际值近似且基本不随时间变化。永久性接地故障下线路不符合电容模型，计算电容值可能为负且随时间变化剧烈。相间故障时，合闸一故障相，故障点的存在会使未合闸相的暂态响应产生差异，未合闸相之间存在较大的线电压暂态量。对于接地故障，利用模型识别思想构造了识别电容参数的永久性故障识别判据；对于相间故障，构造了利用线电压暂态量的永久性故障识别判据。PSCAD仿真结果表明，所提方法能够在不同故障位置、不同过渡电阻情况下准确识别配电网永久性故障。 |
| 关键词: 配电网 永久性故障判别 分相开关 暂态过程 探测式 |
| DOI：10.19783/j.cnki.pspc.220824 |
| 投稿时间：2022-06-01修订日期：2022-11-25 |
| 基金项目:国家自然科学基金国际合作与交流项目资助(52061635105)；国家自然科学基金青年项目资助(52107123)；中国博士后基金项目资助(2021M692525) |
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| Permanent fault identification method of a distribution network based ondetection using a phase segregated switch |
| LI Hao1,SONG Guobing1，2,FAN Yanfang1,CHANG Zhongxue2,ZHANG Wei2 |
| (1. School of Electrical Engineering, Xinjiang University, Urumqi 830047, China;
2. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China) |
| Abstract: |
| The blind recloser of automatic reclosing in a permanent fault brings secondary impact to the distribution network. Thus an active detection scheme for identifying the permanent fault using a phase segregated switch is proposed. In the case of a transient ground fault, the transmission line is equivalent to a capacitance model, and the transient voltage and current are used to obtain the calculated capacitance by the least squares method. The calculated capacitance is similar to the actual value and effectively does not change with time. In the case of a permanent ground fault, the transmission line does not conform to the capacitance model, and the calculated capacitance may be negative and changes drastically with time. In the case of a phase-to-phase fault, one faulty phase is closed, and the existence of the fault point will cause a difference in the transient response of the unclosed phases and there is a large transient line voltage between unclosed phases. For the ground fault, a permanent fault identification criterion is constructed to identify the capacitance parameter using the idea of model identification. For the phase-to-phase fault, a permanent fault identification criterion using transient line voltage is constructed. The PSCAD simulation results show that the proposed method can accurately identify the permanent fault of a distribution network at different fault locations with different transition resistances.
This work is supported by the International Corporation and Communication Program of National Natural Science Foundation of China (No. 52061635105). |
| Key words: distribution network permanent fault identification phase segregated switch transient process detection |
