Progressing towards DC electrical systems for marine vessels

Kurniawan²,

Sarwito³

et al. 2023

IJECE

<span lang="EN-US">Direct current (DC) shipboard power distribution system offers higher power efficiency and voltage stability compared to the alternating current (AC) systems due to lower impedance. The implementation of DC distribution system in all-electric ship seems to be worthy since the reduction of power loss and voltage drop could overcome the drawback of DC system. However, the effectiveness of DC distribution system in ship with non-electric propulsion has not been investigated yet. Unlike in an all-electric ship, electric power flow in the distribution system of a ship with mechanic propulsion is considerably lower. The study aims to provide numerical analysis of power loss and voltage drop reduction on DC distribution system that applied to a ship with mechanic propulsion. The power flow analysis is performed on a tanker ship. Contrary to the hypothesis, the results show that the DC power distribution increase the power losses about 15% compared to AC system due to the addition of rectifier and inverter. However, the voltage drops are decreased in DC distribution system. Further investigation in the other aspects should be performed before concludes whether DC distribution system is worthy to be used in the aforementioned ship.</span>

Section: Introductionmentioning

confidence: 99%

Power flow analysis of DC distribution system in a ship with non-electric propulsion

Kurniawan²,

Sarwito³

et al. 2023

IJECE

“…Electrical energy produced by conventional generators requires a transmission and distribution system so that electric power can meet the needs of the load. The distribution system is tasked with dividing electric power to several load centers through substations and connecting substations [2] There are two methods that have been proven to increase the efficiency of the electrical system on ships, namely reconfiguration from a radial alternating current (AC) distribution system to a zonal AC system [3,4], or replacing the electricity distribution system from an AC system to a direct current [5][6][7][8]. The use of an AC electrical distribution system has become a common thing used in on-board power systems on ships.…”

Section: Introductionmentioning

confidence: 99%

Comparison of voltage drop in AC and DC shipboard electrical power distribution systems: A case study of 17,500 DWT tanker vessel

IOP Conf. Ser.: Earth Environ. Sci.

Sarwito

et al. 2022

The recent emergence of power electronics equipment raises the possibility of implementation of DC shipboard electrical distribution systems. Several investigations on the effectiveness of DC shipboard electrical power distribution systems have proven that it is more profitable than AC distribution systems both in technical and economical aspect. However, known investigations are still limited to the system in ship with electric propulsion, which the consumption of electric power is enormous. The current study investigates the technical performance of both distribution systems in a non-electric propulsion ship, especially in the aspect of power losses. Both of the original AC distribution systems in a 17,500 DWT tanker ship and its equal DC distribution systems are modelled in a computer simulation program. The electric power flow simulation for both models are performed with the data of electric load during operating conditions, to compare the power losses in the distribution systems. The results show that the DC distribution systems has fewer drop voltage than its AC counterpart.

“…By using a DC system, the impedance in electricity will decrease because there is only a resistance value (R), as a result the value of falling and power loss will be smaller. Changes made will affect the amount of short circuit current that may occur [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of short-circuit current in AC and DC shipboard electrical power distribution systems: A case study of 17,500 DWT tanker vessel

Gumilang

IOP Conf. Ser.: Earth Environ. Sci.

Sarwito

et al. 2022

The current ability of power electronic devices increases the possibility to change the shipboard electrical power distribution system from widely-used alternating current (AC) to direct current (DC) systems. DC distribution systems has been known to offer higher power efficiency compared with AC distribution systems. However, the decision to move the shipboard electrical power distribution systems to DC systems requires more information in technical aspects aside of power efficiency. In this study, the investigation to compare short-circuit current between AC and DC distribution systems in non-electric propulsion vessel is conducted. The investigation is performed for electrical power distribution system of 17,500 DWT tanker vessel. Short-circuit current profile for both systems are obtained from simulation in computer software. The results indicate that the DC shipboard electrical power distribution systems has lower short-circuit current than the AC system for the same vessel.