电工技术学报2018，Vol.33Issue(8)：1863-1874,12.DOI:10.19595/j.cnki.1000-6753.tces.161814
柔性直流配电网故障分析
Fault Analysis of Flxible DC Distribution System
摘要
Abstract
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.关键词
直流配电网/接地方式/故障分析/极间故障/单极故障Key words
DC distribution network/grounding mode/fault analysis/pole-to-pole fault/pole-to-ground fault分类
信息技术与安全科学引用本文复制引用
戴志辉,葛红波,严思齐,王增平,陈曦..柔性直流配电网故障分析[J].电工技术学报,2018,33(8):1863-1874,12.基金项目
国家重点研发计划专项课题(2016YFB0900203)、国家自然科学基金(51307059)和中央高校基本科研业务费(2017MS096)资助项目. （2016YFB0900203）
