Recently there has been a persistent trend in increasing the volume of electrical equipment used in ship needs. Thus, the most efficient and environmentally friendly ship power distribution system is the direct current (DC) system, which was adopted for the uniform electric power plant of the vessel in conjunction with an AC network. The ship power supply system using DC provides simple, flexible and functional integration of energy sources such as variable-speed generators and shaft

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... batteries and fuel cells. During the system creation, much attention was paid to the variable-speed generators, where the power transmission, as well as drive and traction propulsive devices are electric drives with variable speed, which can reduce fuel consumption on some types of vessels. The schematic solutions of electrical propulsion plants with a distributed DC bus for auxiliary fleet vessels on the example of the projects of the supply vessel Dina Star and the port icebreaker Aker ARC 124 are discussed in the paper. The possibilities are determined and the structure of the prospective system is analyzed. The issues of the electric energy accumulation in the dynamic modes of the plant operation are considered. The analysis of the electrical energy storage, as well as connection diagrams is performed. The efficiency of using the electrical propulsion plants in the dynamic modes characteristic of the selected types of vessels is shown. The use of diesel engines of variable speed on the vessels is considered. Keywords: electrical propulsion plant, system with a distributed DC bus, DC systems, auxiliary fleet vessels. For citation: Romanovskiy, Victor V., Vladimir A. Malishev, and Artem S. Bezhik. "Special structure of the electrical propulsion plant with DC-grid system." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 11.1 (2019): 169-181.