Design and Dynamic Response Characteristics Analysis of Hydrogen Fuel Cell Ship Combined Cooling and Power Supply System

ABSTRACT

The proposed solution to the mismatch in spatial and temporal scales, as well as addressing the unstable bus voltage resulting from hydrogen fuel cell integration onboard marine vessels, is an integrated hybrid energy storage and complementary cogeneration system equipped with a Cold Electric Dynamic Power Smoothing system, designated as CE‐DPS. Utilizing a state‐space averaged model constructed in Matlab Simulink with the ode23t solver facilitates the transient analysis of multi‐physical phenomena through a multi‐tiered collaborative control structure. The bottom tier uses enhanced droop control and virtual mass inertia for stabilizing the bus; the top tier utilizes second‐order low‐pass filtering (LPF) in order to distribute the power and also makes use of the refrigeration thermal mass to reduce peak demand. Simulation results demonstrate that the CE‐DPS will keep the DC bus voltage from exceeding safe operating limits (712 V), eliminate overshoot of the voltage during transient operation, and retain system stability in addition to providing an estimated exergy efficiency of 68% and median hydrogen consumption of 12.1 kg/100 nm, providing an overall fuel savings rate of 15.6%.