Design And Optimization Of Energy Management Strategy For Hybrid Power System Of Inland Small Fuel Cell Passenger Ship

The hybrid power system structure with fuel cell as the main power supply and battery as the auxiliary power supply is determined in the inland river small fuel cell passenger ship.The two are connected to DC bus in parallel,in which fuel cell is connected to DC bus through a DC/DC converter,and the battery is directly connected to DC bus.On the premise of meeting power requirement of the passenger ship,the improved finite state machine is proposed to improve the real-time performance of energy management strategy control in passenger ship operation.In addition,a multi-objective optimization energy management strategy based on evaluation factor is proposed to optimize the operation economy and energy saving of the fuel cell passenger ship.In the inland river small fuel cell passenger ship,the hybrid power system structure composed of fuel cell and battery(FC + B)is determined,in which the proton exchange membrane fuel cell is the main power supply and the lithium-ion battery is the auxiliary power supply.By analyzing the working characteristics of the proton exchange membrane fuel cell and the lithium-ion battery,the fuel cell is connected to the DC bus through a Buck-Boost DC/DC converter and the battery is connected directly to the DC bus.The battery and fuel cell form a parallel structure.The working principle of the Buck-Boost DC/DC converter and its function in the power system are explained.The components of the DC/DC converter are calculated and selected to meet the operation of the hybrid power system.In the environment of Matlab/Simulink,the mathematical models of the fuel cell,battery and DC/DC converter are established,which provides a platform for the simulation of energy management strategy.In order to improve the real-time control of energy management strategy in the operation of fuel cell passenger ship,an energy management strategy based on the improved finite state machine is proposed by combining the equivalent hydrogen consumption minimum strategy with the finite state machine theory.The control range of the finite state machine is divided by the different state of charge of the battery,and the control mode of each range is determined.In the Matlab/Simulink environment,the control model of the energy management strategy is established,and the simulation is carried out in an operation cycle of the fuel cell passenger ship.By comparing the control results of the equivalent hydrogen consumption strategy and the energy management strategy based on the improved finite state machine under different state of charge of battery,it is proved that the energy management strategy based on the improved finite state machine is able to improve the real-time performance of the strategy control.In this paper,the economy and energy-saving of inland river small fuel cell passenger ship are considered simultaneously.Through the mathematical modeling of the economy and energy-saving of the passenger ship,Pareto multi-objective optimization theory is introduced,and the Pareto optimal solution set which is sui Table for this paper is defined.A widely applicable strategy evaluation factor is proposed for the energy managementstrategy of multi-objective optimization.In the Matlab/Simulink environment,the control model of the multi-objective optimization energy management strategy based on the evaluation factor is established,and the simulation of the energy management control strategy is carried out in an operation cycle of the fuel cell passenger ship.By analyzing the control results of the multi-objective optimization energy management strategy based on the evaluation factor,the single objective optimization energy management strategy and other multi-objective optimization energy management strategies,the superiority of the multi-objective optimal energy management strategy based on the evaluation factor is demonstrated,and the conclusion that the multi-objective optimal energy management strategy based on the evaluation factor proposed in this paper is more conducive to the economic and energy-saving operation of the inland river small fuel cell passenger ship is obtained.