DC-grid system for ships: a study of benefits and technical considerations

ABSTRACT The primary electric power system of ships has been based on the alternating current (AC) system for a long time. However, marine engineers started to question the efficiency of the AC-grid system, which was previously taken for granted and attempted to find a more efficient and eco-friendly electric power distribution system. Following this trend in the marine industry, the direct current (DC) system was adopted for the electric distribution system in ships and combined with the AC-grid. In this regard, this paper presents the technical, economic, and environmental benefits of the DC-grid system for marine applications. Ships that have already applied or plan to apply the DC-grid system are categorized into several types. Additionally, some technical considerations focused on the fault protection topology, the power-sharing (balancing) topology, power quality/stability issues, power source control methods, DC arc flash hazard, and international regulations/standards regarding DC-grid ships are reviewed. Lastly, the prospects of the DC-grid system in ships are addressed with a conclusion.

[1]  Chunyang Gu,et al.  Semiconductor Devices in Solid-State/Hybrid Circuit Breakers: Current Status and Future Trends , 2017 .

[2]  Seung-Ki Sul,et al.  Control and Analysis of Engine Governor for Improved Stability of DC Microgrid Against Load Disturbance , 2016, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[3]  Stephen F. Sarar.  A galvanically isolated power converter module for DC Zonal Electric Distribution Systems , 2006 .

[4]  José J. de-Troya,et al.  Analysing the possibilities of using fuel cells in ships , 2016 .

[5]  Marta Molinas,et al.  The Marine Vessel’s Electrical Power System: From its Birth to Present Day , 2015, Proceedings of the IEEE.

[6]  Daniel R Doan,et al.  Arc Flash Calculations for Exposures to DC Systems , 2010, IEEE Transactions on Industry Applications.

[7]  George J. Tsekouras,et al.  Optimal Active Power Management in All Electric Ship Employing DC Grid Technology , 2017 .

[8]  Tron Hansen Syverud.  Modeling and Control of a DC-grid Hybrid Power System with Battery and Variable Speed Diesel Generators , 2016 .

[9]  V. Staudt,et al.  Short-circuit protection issues in DC ship grids , 2013, 2013 IEEE Electric Ship Technologies Symposium (ESTS).

[10]  Andersen,et al.  A Diagnostic System for Remote Real-Time Monitoring of Marine Diesel-Electric Propulsion Systems , 2011 .

[11]  Mehdi Savaghebi,et al.  Maritime DC microgrids - a combination of microgrid technologies and maritime onboard power system for future ships , 2016, 2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia).

[12]  Josep M. Guerrero,et al.  Review of Ship Microgrids: System Architectures, Storage Technologies and Power Quality Aspects , 2017 .

[13]  TRANSIENT RESPONSE BEHAVIOUR OF GAS ENGINES , 2011 .

[14]  Jinyu Wen,et al.  Research on fast solid state DC breaker based on a natural current zero-crossing point , 2014 .

[15]  Magdi S Mahmoud.  Microgrid : advanced control methods and renewable energy system integration , 2016 .

[16]  J. J. Hopman,et al.  Design and control of hybrid power and propulsion systems for smart ships: A review of developments , 2017 .

[17]  Abhisek Ukil,et al.  Protection strategies for LVDC distribution system , 2015, 2015 IEEE Eindhoven PowerTech.

[18]  P. Wilson,et al.  Development of a multi-scheme energy management strategy for a hybrid fuel cell driven passenger ship , 2017 .

[19]  Oj Simmonds.  DC: Is it the alternative choice for naval power distribution? , 2014 .