Single-Ended Protection Scheme for VSC-Based DC Microgrid Lines

Cheng Lv, Xiaodong Zheng, Nengling Tai and Shi Chen
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Cheng Lv: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xiaodong Zheng: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Nengling Tai: Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Shi Chen: Power Grid Technology Centre, State Grid Jiangsu Electric Power Company Research Institute, Nanjing 211103, China

Energies, 2018, vol. 11, issue 6, 1-17

Abstract: With the promotion of distributed energy and direct current (DC) loads, the DC microgrid is able to provide a higher power quality and improve the grid efficiency. Various technical issues in DC microgrids are still to be addressed, particularly a proper protection scheme for fault detection and isolation in DC microgrids utilizing voltage source converters (VSCs). In this paper, the pole-to-pole DC fault transient behavior of the VSC-based microgrids is firstly analyzed with four successive stages, and then the exact requirements for protections are presented. Furthermore, a novel single-ended protection scheme based on local transient signals is proposed, which needs no data transmission or synchronization between two ends, ensuring the speed. A four-terminal DC microgrid model was built in PSCAD/EMTDC. Numerous simulations have demonstrated the validity of the proposed scheme.

Keywords: DC microgrid system; single-ended protection scheme; voltage source converter (VSC); transient characteristics; PSCAD/EMTDC (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: 2018
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