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Journal of Applied Mathematics
Volume 2014 (2014), Article ID 241070, 12 pages
http://dx.doi.org/10.1155/2014/241070
Research Article

Protection for DC Distribution System with Distributed Generator

1Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
2Dispatching and Control Center of Tianjin Electric Power Corporation, Tianjin 300010, China

Received 23 January 2014; Revised 9 May 2014; Accepted 12 May 2014; Published 17 June 2014

Academic Editor: Hongjie Jia

Copyright © 2014 Shimin Xue et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

DC distribution system has advantages of high power quality, large transmission capacity, high reliability, simple structure, economy and low energy consumption, and so forth. It has been a key part of smart grid nowadays. However, the development of DC distribution system is constrained by the lack of operational experience in DC system, the small interrupting capacity of DC circuit breaker (CB), and the lack of protection schemes for system itself. In this paper, protection for DC distribution system with distributed generator (DG) is fully investigated and verified. Firstly, the electromagnetic transient model of DC distribution system with DG is presented. Simulation based on the electromagnetic transient model is carried out. Both the step response and the steady-state performance verify the accuracy of the model. Then the fault characteristic mechanism is analyzed, and the protection principles and scheme are investigated in detail, including voltage mutation principle as protection starting component, differential current protection principle for DC bus, and two-section current protection for distribution lines. Finally, transient responses with protection scheme are analyzed during faults. The results present that the protection principles and scheme are feasible for DC distribution system with DG.