Investigation of different system earthing schemes for protection of low-voltage DC microgrids

Abstract

DC microgrids are expected to play an important role in maximising the benefits of distributed energy resources in future low carbon smart power systems. One of the remaining complex challenges is the requirement for effective DC protection solutions. The advancement of DC protection is hindered by the lack of good understanding and development of reliable and effective earthing schemes which can enable safe and secure operation of DC microgrids in both on-grid and off-grid modes. Therefore, this study discusses different DC microgrid earthing opportunities, and comprehensively evaluates through detailed simulation studies the influence of different earthing methods on the fault behaviour of DC microgrid. A transient model of an active DC microgrid is developed in PSCAD/EMTDC and used for the paper studies.

Keywords

• distributed power generation
• earthing
• power generation protection
• power generation reliability
• power system security
• smart power grids
• power generation faults
• power system cad
• distributed energy resources
• reliable earthing schemes
• active dc microgrid
• low-voltage dc microgrid protection
• low carbon smart power systems
• dc microgrid earthing opportunities
• off-grid modes
• on-grid modes
• pscad-emtdc