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ABSTRACT In this paper, an adaptive equivalent fuel consumption minimization strategy (AECMS) is proposed for a hybrid diesel engine/battery/cold ironing power system to eliminate the impact of power fluctuations on fuel consumption and battery life. Equivalent factor (EF) is varied according to the state of diesel engine and battery. Then the power split is adjusted between diesel engine and the battery. Finally, a simulation case study based on a mini polar cruise ship validates the superiority of AECMS. The results show that 9.46% and 2.57% of fuel are saved compared with rule-based energy management strategy and conventional equivalent fuel consumption minimization strategy. In addition, a more stable trajectory of state of charge has been achieved which helps prolong battery life.
INTRODUCTION Mini polar cruise ship sails in polar regions, and the navigation environment is complex due to the combined effect of temperature and latitude varying. Mini polar cruise ship has certain adventure functions and can sail in polar narrow waters, bring a good polar tour experience to passengers. However, in the process of sightseeing, ships burn a large amount of fossil fuels, and emit greenhouse gases and polluting gases seriously which threaten the polar environment (Xing, Spence et al. 2020). To address this challenge, The International Maritime Organization (IMO) has introduced increasingly stringent laws and regulations, such as the Ship Energy Efficiency Management Plan (SEEMP)(IMO 2016); Ship Energy Efficiency Design Index (EEDI)(IMO 2014); and the Ship Energy Efficiency Operating Index (EEOI)(IMO 2009). Improving the green level of ships is an inevitable trend in the development of ship power systems (SPS) in the future, and it is also a hot issue in academic research. Hybrid electric power systems (HEPSs) have been widely used in the automotive field because of their excellent fuel economy, and have also attracted extensive attention in the marine field. In (Dedes, Hudson et al. 2012), the potential of fuel saving for shipping fleet is investigated, the result show that maximum 14% of emission reduction in bulk carrier can be achieved. In (Geertsma, Negenborn et al. 2017), the development of SPS is reviewed and the trend of hybrid power system is conformed. 10%-35% reduction of fuel consumption and emissions can be achieved by adopting hybrid architectures. HEPS usually contain two or more energy sources, which can be divided into series, parallel and series-parallel according to different system architectures (Yuan, Wang et al. 2020).
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