A Research of Grounding Mode and New Protection Principle for DC Microgrids

被引：0
|
作者：
Xue S. [1 ]
Qi J. [1 ]
Liu C. [1 ]
Lian J. [1 ]
机构：
[1] Key Laboratory of Smart Grid, Tianjin University, Ministry of Education, Nankai District, Tianjin
来源：
Xue, Shimin (xsm@tju.edu.cn) | 2018年 / Power System Technology Press卷 / 42期
基金：
中国国家自然科学基金; 天津市自然科学基金;
关键词：
DC microgrids; Dead zone of protective relay; Grounding mode; Protection principle;
D O I：
10.13335/j.1000-3673.pst.2017.1409
中图分类号：
学科分类号：
摘要：
With promotion of renewable energy and popularization of DC loads, DC microgrids is able to improve efficiency of distributed generation and meet development tendency of future power grids requiring clean environment and smart operation, draws more and more attentions. In many research directions of DC microgrids, grounding mode determines grounding fault feature, consequently influencing choice and setting of protection scheme. However, study of DC microgrids grounding mode is still in initial stage. This paper selects optimal grounding schemes by compare advantages and disadvantages, application value, and economy of a various grounding modes. On this basis, a protection criterion acting reliably in situation of large transition resistance is designed, and a resistance current limiter is applied to eliminate dead zone of protective relays. Finally, a transverse protection is proposed and its applicability in different network structures and fault locations is analyzed. Validity of the protection scheme is verified with simulations. © 2018, Power System Technology Press. All right reserved.
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页码：48 / 55
页数：7
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