Recently, various projects are underway in accordance with the government’s green new deal policy in Korea. As part of that, the eco-friendly energy transition projects have been promoted for standalone islands, which are not connected to mainland power system, from 2021. Meanwhile, various demonstration projects have been conducted based on the microgrid energy management system technology accumulated based on the existing microgrid researches, and the commercialization stage has been reached. In this paper, the load characteristics of standalone islands are analyzed and categorized for standardization of MG controllers suitable for standalone island microgrids.