Protection Strategy of Single-pole Grounding Fault in DC Distribution System Based on Coordination of Control and Protection

被引：0

作者：

Wang S. ^{[1
,2
]}

Wang Z. ^{[1
,2
]}

Liu Q. ^{[1
,2
]}

Chen Q. ^{[3
]}

Yang J. ^{[4
]}

机构：

[1] Key Laboratory of the Ministry of Education on Smart Power Grids, Tianjin University, Tianjin

[2] Tianjin Key Laboratory of Power System Simulation and Control, Tianjin University, Tianjin

[3] State Grid Jiangsu Electric Power Co., Ltd., Nanjing

[4] Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 17期

关键词：

Coordination of control and protection; Current differential; DC distribution system; Fault mechanism; Protection strategy; Single-pole grounding fault;

D O I：

10.7500/AEPS20200320004

中图分类号：

学科分类号：

摘要：

With the development of power electronic technology, flexible DC distribution system has gradually become a research hotspot. Single-pole grounding fault is the most common fault type in the DC distribution system. When the AC side is grounded through high resistance, the change of fault current is not obvious after the single-pole grounding fault occurs on DC side, so it is difficult to accurately locate the fault. Based on the coordination of control and protection, a single-pole grounding fault protection strategy is proposed for double-terminal DC distribution system. By detecting the current differential of the AC grounding branch on the spot to judge the occurrence of the fault, the small resistor in parallel on the AC grounding branch can be switched on quickly. Compared with traditional differential protection methods, the proposed method saves the communication time and effectively improves the rapidity of the protection. At the same time, according to the requirements of protection reliability, the resistance value of the parallel small resistor is optimized. Finally, the simulation analysis is carried out in PSCAD/EMTDC platform to verify the reliability and rapidity of the proposed protection strategy. © 2020 Automation of Electric Power Systems Press.

引用

页码：120 / 126

页数：6

共 27 条

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