柔性直流配电网故障分析

doi:10.19595/j.cnki.1000-6753.tces.161814

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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.

Key words： DC distribution network grounding mode fault analysis pole-to-pole fault pole- to-ground fault

Received: 18 November 2016 Published: 24 April 2018

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	Articles by authors
	Dai Zhihui
	Ge Hongbo
	Yan Siqi
	Wang Zengping
	Chen Xi

Cite this article:

Dai Zhihui,Ge Hongbo,Yan Siqi等. Fault Analysis of Flxible DC Distribution System[J]. Transactions of China Electrotechnical Society, 2018, 33(8): 1863-1874.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.161814 OR https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I8/1863

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