Abstract
Extensive electrification of ship power systems appears to be a promising measure to meet stringent environmental requirements. The concept is to enable ship power management to allocate loads in response to load variations in an optimal manner. From a broader design perspective, the reliability of machinery operation is also of importance, especially with regard to the failure cost from power outages. In this paper, an approach for determining optimal power plants based on economic and environmental perspectives across several architecture choices is proposed. The design procedure involves the implementation of metaheuristic optimization to minimize fuel consumption and emissions released, while maintenance and repair services can be extracted using reliability assessment tools. The simulation results demonstrated that ship power management using the whale optimization algorithm (WOA) was able to reduce fuel consumption and corresponding emissions in a range from 4.04–8.86%, varying with the profiles, by eliminating inefficient working generators and distributing loads for the rest to the nearest possible energy-saving areas. There was also a trade-off between maintenance service and overall system expenses. Finally, a compromise solution was sought with the proposed holistic design for contradictory cost components by taking into account fuel operation consumption, shore electricity supply, maintenance service and investment expenditure.
Highlights
IntroductionExtensive electrification through integrated electric propulsion platforms appears to be a cost-effective and emission-aware solution to conform to the tightening restrictions of energy efficiency directives [4]
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The total greenhouse gas (GHG) emissions of global marine transport have increased to 1076 million tons in 2018, which corresponds to a 2.89% share in global anthropogenic pollution [1]
Summary
Extensive electrification through integrated electric propulsion platforms appears to be a cost-effective and emission-aware solution to conform to the tightening restrictions of energy efficiency directives [4]. A typical system platform for diesel-electric cruise passenger ships is comprised of diesel generator sets connected with main switchboard panels. The electrical power is distributed to accommodate all electrical loads throughout the ship, including propulsion motors via variable frequency drives. This centralized power concept enables various optimization techniques through ship power management to optimally allocate loads for individual power generation sources [5]. A fuel cost reduction can be achieved by economic load distribution and minimization of active generator sets. By implementing holistic cost-effective design, the reliability of machine operation should be taken into consideration, with regard to the consequences of failure
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