Advantages of using a DC power system on board ship

Prenc, Rene; Cuculić, Aleksandar; Baumgartner, Ivan

doi:10.18048/2016.52.05

Cited by 23 publications

(14 citation statements)

References 13 publications

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“…In the maritime sector, the adoption of DC topology brings an enormous range of advantages to the onboard power system by eliminating the frequency constraint, allowing utilization of high-speed generators, and providing systematic management [81]. R. Prenc et al [82] stated that DC ship power systems in the maritime sector prevailed over the AC systems due to the following reasons; 1) improvements in prime mover performance and fuel cost savings, 2) reduction in weight and space, 3) unity power factor for generators, 4) low transmission losses, 5) faster and easier parallel connection of generators, 6) flexible and simple implementation of ESSs.…”

Section: Seaport Microgrid Topologymentioning

confidence: 99%

A Review of the Conceptualization and Operational Management of Seaport Microgrids on the Shore and Seaside

Bakar¹,

Guerrero²,

Vásquez³

et al. 2021

Preprint

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Seaports are well known as the medium that has evolved into the central link between sea and land for complex marine activities. The growth in maritime logistics especially necessitates a large volume of energy supply to maintain the operation of sea trade, resulting in an imbalance between the generation and demand sides. Future projections for three major concerns show an increase in load demand, cost of operation, and environmental issues. In order to overcome these problems, integrating microgrids as an innovative technology in the seaport power system appears to be a vital strategy. It is believed that microgrids enhance the seaport operation by providing sustainable, environmentally friendly, and cost-effective energy. Despite the fact that microgrids are well established and widely used in a variety of operations on land, their incorporation into the seaport is still limited. The involvement of a variety of heavy loads such as all-electric ships, cranes, cold ironing, and buildings infrastructure makes it a complicated arrangement task in several aspects, which necessitate further research and leave space for improvement. In this paper, an overview of the seaport microgrids in terms of their concepts, requirements, and operation management is presented. It provides the perspectives of integrating the microgrid concept into a seaport from both shore side and seaside as a smart initiative for the green ports vision. Future research directions are discussed towards the development of more efficient marine power system.

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Section: Seaport Microgrid Topologymentioning

confidence: 99%

A Review of the Conceptualization and Operational Management of Seaport Microgrids on the Shore and Seaside

Bakar¹,

Guerrero²,

Vásquez³

et al. 2021

Preprint

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show abstract

“…Most of the studies conducted on the DC distribution system were focused on the feasibility of the DC distribution system in comparison with the AC distribution system [43][44][45][46][47]. Moreover, several studies were conducted on the enhancement of energy efficiency due to minimization of fuel consumption by the application of a variable-speed engine [28][29][30]37,38,48], the power conversion devices that constitute the power system of a variable speed engine, and specialized components such as propulsion motors and circuit breakers [49,50].…”

Section: Typementioning

confidence: 99%

Application of Reference Voltage Control Method of the Generator Using a Neural Network in Variable Speed Synchronous Generation System of DC Distribution for Ships

Jeon¹,

Kim²

2020

JMSE

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In the case of DC power distribution-based variable speed engine synchronous generators, if the output reference voltage is kept constant regardless of the generator engine operating speed, it may cause damage to the internal device and windings of the generator due to over-flux or over-excitation. The purpose of this study is to adjust the generator reference voltage according to the engine speed change in the DC distribution system with the variable speed engine synchronous generator. A method of controlling the generator reference voltage according to the speed was applied by adjusting the value of the variable resistance input to the external terminal of the automatic voltage regulator using a neural network controller. The learning data of the neural network was measured through an experiment, and the input pattern was set as the rotational speed of the generator engine, and the output pattern was set as the input current of the potentiometer. Using the measured input/output pattern of the neural network, the error backpropagation learning algorithm was applied to derive the optimum connection weight to be applied to the controller. For the test, the variable speed operation range of the generator engine was set to 1100–1800 rpm, and the input current value of the potentiometer according to the speed increase or decrease within the operation range and the output of the voltage output from the actual generator were checked. As a result of neural network control, it was possible to confirm the result that the input current value of the potentiometer accurately reached the target value 4–20 mA at the point where the initial speed change occurred. It was confirmed that the reference voltage was also normally output in the target range of 250–440 V.

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“…A lot of research is being conducted to optimize the operation of maritime microgrids such as enhancing reliability and survivability, improving stability using virtual synchronous generators, and minimizing power curtailment. References [1][2][3][4][5][6][7][8][9][10][11][12][13]20] provide literature on some of these techniques.…”

Section: Maritime Microgridsmentioning

confidence: 99%

“…Because DC buses are at no frequency, the prime mover speed can be adjusted according to demand, all the while correspondingly adjusting the generator excitation current in the same respects. Given this commodity of optimization speed, the operating window of the prime movers can be brought down to about 50% of the rated load with no increase in fuel consumption [2].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Maritime Microgrids: A Quest for Future Onboard Integrated Marine Power Systems

Caravella¹,

Austell²,

Brady-Alvarez³

et al. 2019

Innovation in Energy Systems - New Technologies for Changing Paradigms

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The following is a comprehensive analysis which details potential ways for the maritime industry to begin to phase out AC power generation and distribution on new vessels over a short period of time. Therefore, the vessels of the future should consider transitioning into DC power generation and distribution. During the transition from AC shipboard systems to DC shipboard systems, there will be a time during which the vessels will be run by "hybrid" shipboard power systems, which utilize a mixture of AC and DC power. These systems are known as integrated marine power systems (IMPS) or hybrid maritime microgrid architectures, since they represent a distribution system or a part thereof. This study presents a state of the art of maritime systems, emphasizing on the design aspects of hybrid maritime microgrids, summarizing the advantages, disadvantages, and the challenges that planners may face when it comes to the vessels of the future. This study also reviews remedies that have been recently proposed in the literature to overcome such challenges. In addition, this work reports on the problem of service restoration of shipboard power systems and introduces directions on how to enhance the survivability of maritime power systems using techniques based on distribution system reconfiguration.

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Advantages of using a DC power system on board ship

Cited by 23 publications

References 13 publications

A Review of the Conceptualization and Operational Management of Seaport Microgrids on the Shore and Seaside

A Review of the Conceptualization and Operational Management of Seaport Microgrids on the Shore and Seaside

Application of Reference Voltage Control Method of the Generator Using a Neural Network in Variable Speed Synchronous Generation System of DC Distribution for Ships

Hybrid Maritime Microgrids: A Quest for Future Onboard Integrated Marine Power Systems

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