Embedded Files
Hybrid electric power-train for the vessel
Hybrid electric power-train for the vessel
Recently, propulsion systems of vessels are briskly studied to improve efficiency and to reduce pollutant emissions. In various solutions for achieving targets, optimizing the operating points of propulsion system is necessary for better fuel economy and lower emission.
To change the operating point as shown in this figure, we need to change propulsion topology, such as propulsion structure.
Hybrid electric power-train topology design
Hybrid electric power-train topology design
Hybridization of propulsion system can be achieved by applying hybrid topology and hybrid control strategy. Hybrid topology can be enumerated by combinations of mechanical drive and electric drive, and battery. Mechanical drive such as diesel engine will be used for high speed operation which shows relatively high energy efficiency. On the other hand, electric drive can be used for low speed operation with high efficiency.
(ref. R. D. Geertsma, et. al., “Design and control of hybrid power and propulsion systems for smart ships: A review of development,” Applied Energy, 194, pp.30-54, 2017.)
Optimizing hybrid power control strategy
Optimizing hybrid power control strategy
We are conducting research on optimizing the hybrid power control using dynamic programming and connectivity data. We will try to predict future routing and power by utilizing previous load profile and connectivity data. And then, the hybrid power controller will be optimized using its estimated future load profile and dynamic programming. The results from the dynamic programming can be used for real-time power control logic based on heuristic rule to improve fuel efficiency of hybrid ships.
A Back–Forward Approach-Based Efficiency Performance Analysis Model for Hybrid Electric Propulsion Ships Using the Holtrop–Mennen Method
A Back–Forward Approach-Based Efficiency Performance Analysis Model for Hybrid Electric Propulsion Ships Using the Holtrop–Mennen Method
J. Mar. Sci. Eng. 2024, 12(1), 9; DOI
Abstract
Abstract
In this study, a back–forward approach-based efficiency performance analysis model was developed using the Holtrop–Mennen resistance model to calculate ship resistance and power demand based on a given ship’s speed profiles. This model has the advantages of using easily obtainable ship speed profiles as the input and can be modularized for each power source and ESS, incorporating mechanical performance limitations, and allows for rapid analysis. The developed analytical model was applied to a hybrid electric propulsion system in a marine support vessel and its energy efficiency was evaluated by establishing rule-based power control strategies. As a result, the engine efficiency of the hybrid electric propulsion system increased from about 27% to 30% compared to the existing system, and the final effect of reducing fuel consumption by about 10% compared to the existing system was confirmed through the developed simulator. In the future, this analytical model could be utilized to derive the optimal layout of hybrid electric propulsion systems, and to formulate power control strategies.
Keywords: hybrid electric propulsion ship; Holtrop–Mennen resistance model; ship powertrain model; back–forward powertrain model; energy efficiency
Page updated
Google Sites
Report abuse