Low Voltage DC Microgrid Protection System - A Review

Direct Current (DC) Microgrids protection and operational issues have become a matter of greater concern with the growth in DC distribution market. Different protection schemes for detecting, locating and isolating faults have been studied on several systems under various conditions. This paper presents the state-of-the-art of protection schemes developed for the DC microgrid with a comprehensive evaluation on LVDC systems and their protection. Further, the work compares different fault locating techniques with an emphasis on their complexity level considering the time constraint for operating the protective devices for fault isolation. The existing standards for low voltage DC systems are also presented in this paper.