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A power allocation strategy for fuel cell ship considering fuel cell performance difference.

Wei Cao1, Pan Geng2, Xiaoyan Xu2

  • 1Logistics Engineering College, Shanghai Maritime University, Shanghai, 201306, China. 1206448418@qq.com.

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|June 19, 2023
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Summary
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This study introduces a two-layer power allocation strategy for fuel cell ships, optimizing fuel cell system (FCS) performance and reducing hydrogen consumption. The method enhances overall ship power system efficiency and lowers the operational burden on underperforming FCS units.

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Area of Science:

  • Marine Engineering
  • Renewable Energy Systems
  • Control Systems

Background:

  • Fuel cell ship performance varies, necessitating adaptive power management.
  • Existing power allocation strategies do not fully account for individual fuel cell system (FCS) performance differences.
  • Optimizing energy efficiency and operational load distribution is crucial for maritime applications.

Purpose of the Study:

  • To design a novel two-layer power allocation strategy for fuel cell ships.
  • To improve the energy efficiency of ship power systems.
  • To reduce the operational burden on underperforming fuel cell systems.

Main Methods:

  • Real-time updating of maximum power and efficiency for each FCS using an online parameter identification model.
  • The identification model integrates a fuel cell semi-empirical model and an adaptive Kalman filter.
  • A second layer utilizes battery state of charge, maximum power, and maximum efficiency for power allocation.

Main Results:

  • The proposed strategy reduced total hydrogen consumption by 5.3% compared to equal allocation and 15.1% compared to the daisy chain strategy.
  • Total output power from underperforming FCS was reduced by 14.1% and 15.7% respectively.
  • Demonstrated significant improvements in ship power system efficiency and operational load balancing.

Conclusions:

  • The developed power allocation strategy effectively manages varying fuel cell performance.
  • The method leads to substantial reductions in hydrogen consumption and operational stress on FCS.
  • This approach offers a viable solution for enhancing the efficiency and sustainability of fuel cell powered vessels.