A Protection System for Improved Ring-Bus DC Microgrids

Zhiming Zhang, Qing Chen, Ranran Xie and Yi Zheng
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Zhiming Zhang: Key Laboratory of Power System Intelligent Dispatch and Control, Shandong University, Ministry of Education, Jinan 250061, China
Qing Chen: Key Laboratory of Power System Intelligent Dispatch and Control, Shandong University, Ministry of Education, Jinan 250061, China
Ranran Xie: State Grid TianJin BinHai Electric Power Supply Company, Tianjin 300450, China
Yi Zheng: State Grid Jining Power Supply Company, Jining 272000, China

Energies, 2019, vol. 12, issue 19, 1-14

Abstract: An improved system structure and a corresponding protection system are proposed in this paper, which aims at providing future DC microgrids with suitable protection ideas. At first, the ring-bus system is adjusted to balance the system control and protection and make the system more conventional for the equipment expansion. In addition, based on this structure, a protection system is established. It consists of two parts, which are local protection and pilot centralized protection. The local protection is designed for protecting the vulnerable power electronic components in converters and the pilot protection is mainly proposed for the fault isolation. The combination between two parts makes the whole system overcome the contradiction between protection speed and reliability and the method also takes the protection suitability into consideration. Finally, all the methods are verified by the simulation system based on the PSCAD /EMTDC.

Keywords: DC microgrid; system structure; local protection; centralized pilot protection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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