An online energy-tracking-based approach for fault-identification applies to the NUGS
An online energy-tracking-based approach for fault-identification applies to the NUGS
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基于在线能量跟踪的故障识别方法适用于 NUGS
DOI：
10.1016/j.ijepes.2020.105902
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发表时间：
2020-07
影响因子：
5.2
通讯作者：
Li Zhengtian
中科院分区：
文献类型：
--
作者：
Tong Ning;Lin Xiangning;Sui Quan;Wang Zhixun;Jin Neng;Li Feiyu;Li Zhengtian
Fault identification for the neutral un-effectively grounded distribution systems (NUGS) has long been an unsolved problem since conventional zero-sequence protective relays cannot trip the single-line-to-ground fault. Moreover, few branch-feeders are equipped with zero-sequence current monitors, whereas existing fault-identification methods that not relying on the zero-sequence current measurement are facing problems regarding speed and sensitivity. To solve this problem, the distribution characteristics of the high-frequency energy of the faulted phase within the entire NUGS is firstly analyzed. Then, the principal-component-energy (PCE) is employed to represent the high-frequency energy related to the occurrence of the single-line-to-ground fault. Finally, an online tracking approach is proposed to find the origin of the PCE. To assess the performance of the proposed method, massive fault scenarios are studied on a closed-loop RTDS test platform. Test results indicate that the proposed method is capable of online application independent of zero-sequence current measurement and data synchronization. Also, the sensitivity is high enough to cover a thousand Ohms’ fault resistance.
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