In recent years, there has been a growing concern regarding hybrid electric ships in comparison to traditional diesel motor ships due to their significantly greater impact on energy conservation and emission reduction. In order to comprehensively improve the environmental protection and economic benefits of ships, this article studies the optimal oil electric hybrid ratio for hybrid power ships in inland river basins. Firstly, considering the impact of midway power exchange and dry and flood seasons on channel conditions, a hybrid ship economic calculation model and carbon emission model are constructed. Next, analyze the impact of battery capacity on ship economy for different cargo capacity and different voyage transportation. Finally, a study was conducted on optimizing the battery capacity and principal dimensions of a 300TEU container ship. This study has determined the optimal ratio of oil and electricity mix for electric ships with a voyage distances, which can enhance both the environmental sustainability and economic advantages of the vessel.
In order to meet the environmental protection requirements imposed by the increasingly stringent regulations on carbon, sulfur and nitrogen emissions in various countries, the shipping industry must comply with a series of mandatory regulations, conventions and rising costs. The research and application of new energy for ship energy-saving and emission reduction have progressed rapidly to comply with the changing times.
Scholars at home and abroad have done some research on ship hybrid power system. Da Xu et al (2021) introduced the structural composition and characteristics of ship hybrid power system, analyzed the key technologies of the system and the current research status, such as power generation access technology, energy control strategy and new batteries, etc., and analyzed the diesel-electric hybrid power system to be explored and the application prospects. Zhangchao Liu et al (2019) introduced the development of diesel-electric hybrid power system for domestic ships, analyzed the typical application cases of diesel-electric hybrid power system in China, and put forward the issues to be further explored for the development of diesel-electric hybrid power system. Cheng Zhang et al (2021) construct a multi-objective fuel consumption and pollutant emission optimization model for the power structure of hybrid ships. The multi-objective genetic algorithm (NSGA-II) is used to optimize the power allocation problem between the main engine and the generator, and a trade-off is made among all the objectives to achieve the Pareto optimum as much as possible. Ju Wang et al (2023) built a parallel diesel-electric hybrid propulsion system based on the energy transfer relationship of the ship propulsion system, established a diesel-electric hybrid ship energy management system, determined the optimal selection of the diesel-electric system design scheme, and optimized the segment speed using simulated annealing algorithms, which realized the economic and efficient comprehensive utilization of diesel-electric power energy. Shui Pang et al (2020) took an offshore engineering vessel power system as the research object, studied the characteristics of its seven standard operating conditions, and extracted the power demand range of the seven standard operating conditions. Under the constraint of meeting the safe and stable operation of the vessel, an optimization model is established with the minimization of the vessel's fuel cost and environmental cost as the objective function, and an adaptive differential evolution algorithm is used to perform optimization calculations to derive the optimal power allocation. Zhengyu Jiang et al (2021) derived the optimal capacity optimization allocation scheme by analyzing the working loads of different target ship types and performing simulation calculations using different optimization algorithms.
