Abstract
The DC microgrid has become a typical distribution network due to its excellent performance. However, a well-designed protection scheme still remains a challenge for DC microgrids. At present, researches on DC microgrids primarily focus on the topology structure, control method and energy control, while researches on fault analysis, detection and isolation have not drawn enough attention. Therefore, this paper intends to depict the current research status in different relative areas and review the proposed protection strategies in order to help researchers to have a clear understanding on DC microgrid protection. Meanwhile, to solve the protection issues and promote the development of the DC microgrid, this paper points out the key areas of future research. The future protection research directions lie in the development of novel protection devices, which are based on electronic technology to provide loose protection constraints and the improvement of suitable protection schemes. In addition, the novel concept of coordinated strategy of control and protection of the DC microgrids is explained.
Highlights
The concept of microgrids has been proposed in order to make good use of distributed energy resources (DERs)
The future protection research directions lie in the development of novel protection devices based on electronic technology, which could provide loose protection constraints and the improvement of the protection schemes suitable for the DC microgrids
This paper presents the current research status on relative issues of DC microgrids and reviews the proposed protection strategies
Summary
The concept of microgrids has been proposed in order to make good use of distributed energy resources (DERs). DC microgrids have been investigated in specific applications, including: À LV (up to 1.5 kV DC) data centers [5] and LVDC distribution systems [6]; ` MV (up to 35 kV DC) systems on electric ships and offshore wind power plants [7]. Realizing this potential, academic and industrial institutions are conducting projects around the world, for example FREEDM [8], UNIFLEX [9] and HEART [10]. Some DC loads have direct connection to the DC bus, while other DC loads and AC loads have to be fed through converters
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