Line protection schemes for flexible DC distribution network based on capacitor discharge

被引：0
|
作者：
Zhou J. [1 ]
Li F. [1 ]
Chen W. [2 ]
Da T. [3 ]
Liang L. [1 ]
机构：
[1] College of Electrical Engineering, Xinjiang University, Urumqi
[2] Economics and Technology Research Institute, State Grid Xinjiang Electric Power Company, Urumqi
[3] Urumuqi Power Supply Company, State Grid Xinjiang Electric Power Company, Urumqi
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2019年 / 47卷 / 08期
关键词：
Capacitor discharging; Current derivative; DC distribution network; Fault detection; Shunt capacitor;
D O I：
10.7667/PSPC180580
中图分类号：
学科分类号：
摘要：
In order to solve the protection configuration problem of two-terminal flexible DC distribution network when the converters access to DC buses directly, this paper presents a new protection scheme based on single-end electrical signals. Firstly, the fault characteristics of the two-terminal flexible DC distribution network are analyzed, and the difference of discharge characteristics of converts' shunt capacitor at different busbars are analyzed especially. A main protection is designed based on the differences, which can identify fault areas effectively and isolate the fault within 5 ms. In order to solve the issue of failure detection of main protection, the backup protection is designed based on overcurrent criterion and action delay. Finally, a PSCAD/EMTDC simulation model is built and the simulation results show that the schemes are effective. © 2019, Power System Protection and Control Press. All right reserved.
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页码：42 / 48
页数：6
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