Shipboard Fuel Cell Hybrid Power System Configuration Optimization And Energy Management

In recent years,under the background of China’s energy strategy of achieving the goal of carbon peak and carbon neutralization and vigorously supporting green and low-carbon technology,clean,low-carbon,safe and efficient vehicles in the field of transportation have gradually become the mainstream.In the field of green shipping,new energy is gradually applied to the power system of commercial ships: among them,traditional new energy such as solar energy and wind energy are difficult to be applied on ships due to their intermittent and limited power volume ratio;At present,pure electric ships have been widely used in small and medium-sized commercial ships,but their development prospects are limited due to the limited energy density of power batteries,poor range and insufficient safety;Hydrogen fuel cell has the characteristics of high energy ratio,zero carbon emission and high efficiency.It is very suitable for new energy ship power system.At present,many countries,including China,have promoted the research and development plan of hydrogen fuel ships,some of which have been actually applied to commercial ships.As the main utilization mode of hydrogen energy,fuel cell needs to be combined with energy storage and reprint to be applied to the hybrid power system according to its output characteristics to improve its dynamic response-ability and service life.The energy management method of the hybrid power system is the key factor that determines the ship’s power performance,system durability and navigation economy.In this paper,a diesel-electric propulsion cruise ship is taken as the target ship type.Through the analysis of ship system parameters and characteristics,the parameter matching and simulation modelling of ship fuel cell hybrid systems are carried out.Combined with the actual navigation conditions of the ship,the energy management method of the hybrid system is studied.The main work of this paper is as follows:Firstly,the working condition characteristics of the ship are analyzed,the parameters are matched according to the actual navigation needs,and the capacity configuration of the hybrid power system is optimized to meet the needs of ship manoeuvrability,safety and reliability.The ship fuel cell hybrid power system is built by using Matlab / Simulink simulation platform,and the effectiveness of the model is verified by experiments.On the basis of Simulink simulation,the real-time simulation of fuel cell hybrid power system is realized through the RT-LAB hardware in the loop simulation platform composed of a DSP controller,real-time digital simulator and host computer.Secondly,based on the established marine fuel cell hybrid power system model,according to the actual engineering application requirements of the shipbroad power system,a decentralized energy management method based on virtual impedance droop control is proposed.The simulation shows that this method can realize the dynamic distribution of shipload power and bus voltage recovery without a communication system.Finally,according to the actual sailing conditions of the ship,a layered energy management method based on mode division is proposed.In the mode division layer,mode division is carried out according to the combination of operation mode and SOC state of the energy storage system.In the equipment control layer,the adaptive droop control method is adopted to realize the adaptive control of fuel cell and energy storage systems under different operation modes.Through the verification of the RT-LAB real-time simulation platform,the rapid response of the power system to the load power demand,the recovery of bus voltage and energy storage SOC,the reduction of hydrogen consumption and the improvement of energy storage durability are realized.