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The MVDC distribution is a promising solution for future decentralized electrical networks with a large amount of distributed renewable-energy generation and storage systems. Recently, demonstration projects on an MVDC distribution network have been actively carried out to increase the capacity of an existing AC distribution system. However, since there are no specific protection guidelines for an MVDC station, which is a key facility for power conversion, operation methods of protection devices are required. In this paper, in order to analyze the accident characteristics of the distribution system of the MVDC distribution network, we compared and analyzed the ground fault accidents that occurred in the actual MVDC system and the simulation results. A comparative analysis was performed based on simulation results when a ground fault occurred in the DC link of a 30MW±35kV rated MVDC system and measured values when an actual ground fault occurred.
