Fault Analysis of Flxible DC Distribution System

被引：0
作者：
Dai Z. [1 ]
Ge H. [1 ]
Yan S. [1 ]
Wang Z. [1 ]
Chen X. [2 ]
机构：
[1] Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province, North China Electric Power University, Baoding
[2] Development and Plan Department Baoding Power Supply Company of State Grid Corporation of China, Baoding
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2018年 / 33卷 / 08期
关键词：
DC distribution network; Fault analysis; Grounding mode; Pole- to-ground fault; Pole-to-pole fault;
D O I：
10.19595/j.cnki.1000-6753.tces.161814
中图分类号：
学科分类号：
摘要：
The fault analysis of flexible DC distribution grids is the basis of designing the protection scheme. Up to now, the fault characteristic of DC fault, considering unblocked IGBT in converters, has not been systematically investigated. Firstly, the grounding mode and the control strategy of the DC distribution grid were determined. Secondly, on the premise that IGBT is unblocked, this paper analyzed fault characteristics of pole-to-pole fault and pole-to-ground fault, as well as the influence of fault resistance. The impacts of DC faults on other sections were also discussed. The results show that, with regard to the pole-to-pole fault, whether IGBT is blocked or not does not affect the fault characteristic evidently in the first two transient stages. However, when the fault reaches the steady state, compared with the condition that the IGBT is unblocked, the DC voltage and fault current are larger when the IGBT is blocked. In terms of the pole-to-ground fault, the unblocked IGBT would result in DC unbalance voltage, which will further generate DC components in the ac-side current of the converter. Finally, the simulation model was built in PSCAD/EMTDC, and the result confirms the validity of the theoretical analysis. © 2018, Electrical Technology Press Co. Ltd. All right reserved.
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页码：1863 / 1874
页数：11
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