Protection Method of Flexible DC Power Distribution Network Based on Grounding Mode with High Resistor and Arrester in Parallel

被引：0
|
作者：
Jia Y. [1 ]
Gao S. [2 ,3 ]
Si X. [1 ]
Shi Y. [4 ]
Zhan X. [5 ]
Wang J. [2 ,3 ]
机构：
[1] Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing
[2] School of Electrical Engineering, Southeast University, Nanjing
[3] Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment, Southeast University, Nanjing
[4] NR Electric Co., Ltd., Nanjing
[5] Yangzhou Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd., Yangzhou
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 10期
关键词：
Arrester; Flexible DC power distribution network; Grounding; Overvoltage; Protection;
D O I：
10.7500/AEPS20190430031
中图分类号：
学科分类号：
摘要：
To solve the difficult problem of monopolar grounding fault detection in flexible medium-voltage DC power distribution network, this paper proposes a new grounding mode with high resistor and arrester in parallel and a protection strategy including adaptive amplification factor. Firstly, advantages and disadvantages of the existing grounding modes in flexible DC distribution network are discussed. A new grounding mode with high resistor and arrester in parallel via the neutral point of the coupling transformer is proposed. Secondly, the overvoltage mechanism and fault characteristics of the new grounding mode are analyzed by theoretical derivation with AC/DC grounding faults. According to voltage and current characteristics in different fault conditions, the DC line protection strategy is developed. It realizes the accurate and rapid fault identification of differential protection with faults in DC network. Finally, the effectiveness of the new grounding mode and the reliability of the proposed protection method are verified by simulation example. © 2020 Automation of Electric Power Systems Press.
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页码：166 / 173
页数：7
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