Protection Method for Flexible DC Distribution Network Faults Based on Current Limiting Reactance Voltage

被引：0
|
作者：
Wei Y. [1 ,2 ]
Wang Z. [1 ]
Wang P. [3 ]
Zeng Z. [1 ]
Wang X. [4 ]
机构：
[1] School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo
[2] Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, Henan Polytechnic University, Jiaozuo
[3] State Grid Henan Electric Power Company Scientific Research Institute, Zhengzhou
[4] School of Electrical Engineering, Xi’an University of Technology, Xi’an
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 12期
基金：
中国国家自然科学基金;
关键词：
current limiting reactance voltage; fault detection; flexible DC distribution network; kurtosis; margin factor; Savitzky-Golay filtering;
D O I：
10.13336/j.1003-6520.hve.20220485
中图分类号：
学科分类号：
摘要：
The flexible DC distribution network has the characteristics of fast rising speed of fault current and high amplitude. Therefore, the fast and reliable identification of DC line faults is a key technology that needs to be broken through in the DC distribution network. Based on the electrical characteristics of DC line boundary elements, this paper proposes a new line boundary protection scheme for DC distribution networks. First, Savitzky-Golay filtering and the current differential of the DC line are taken as the protection starting criterion according to the characteristics of the sharp rise of the capacitor discharge current when the DC distribution network fails. Then, based on the difference between the voltages on both sides of the current-limiting reactance at both ends of the positive and negative lines after a fault occurs, a protection criterion for identifying internal and external faults by margin factor algorithm is proposed. Finally, the ratio of the kurtosis values of the positive and negative current limiting reactors of the fault line is obtained to form the fault pole selection identification scheme. The test results show that the proposed protection scheme can be employed to effectively identify fault poles and internal and external faults. The method has low requirements for communication, strong ability to withstand transition resistance, and certain anti-interference ability, which meets the requirements of the DC power distribution system for rapidity, selectivity and reliability of protection. © 2022 Science Press. All rights reserved.
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页码：5068 / 5079
页数：11
相关论文
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