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The methods of calculation of short-circuit currents in shipboard electric power systems with electric power distribution on direct current and with valve generators are considered. Unlike systems with a single type of current, in the systems under consideration, the generation and consumption of electric power occurs on alternating current, and the distribution occurs on a direct current. The actual standards for the calculation of short-circuit currents can not be used in such systems for a number of reasons. In particular, they do not consider separate sources of energizing of the short-circuit point and the operating modes of valve generator sets with variable rotation speed. AC electric machines receiving power supply from the DC grid through inverters carry out energizing of the short-circuit point in the DC network, what is due to the presence of reverse diodes.The capacitors banks in DC link are an additional source of energizing of short-circuit point. With a small resistance of the sections of the circuit through which the discharge currents of capacitors flow, the values of the discharge currents can reach hundreds of kiloamperes. Short-circuit currents cause a strong electrodynamic effect on the bus bars and can lead to serious damage to the switchboards with the occurrence of a fire. Due to this, it is necessary to develop methods for calculating of short-circuit currents in such systems. Methods for determining the maximum value of the shock current in the short-circuit point of the electric power system with the distribution of electric power on direct current are proposed in the article. Increasing the accuracy of calculations of shortcircuit currents will increase the reliability and safety of shipboard electric power systems with electric power distribution on direct current.

vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s. o. makarova/vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s.o. makarova

METHODS OF CALCULATION OF SHORT-CIRCUIT CURRENTS IN SHIPBOARD ELECTRIC POWER SYSTEMS WITH TOTAL ELECTRIC POWER DISTRIBUTION ON DIRECT CURRENT