Construction And Simulation Of Hybrid Power System For Proton Exchange Membrane Fuel Cell Of Forklift

With the economic development of China,the logistics is booming as well.Loading and unloading operations play an important role in logistics and transportion,which has a great influence on the operation efficiency.The current power of such equipment,including different types of forklift trucks,stackers,cranes,conveyor and sorters,is internal-combustion engines and batteries primarily.Traditional forklifts powered by internal-combustion engines and batteries have challenges like exhaust pollution,noise,waste battery,etc.Fuel cell forklift trucks have appeared and attracted numerous attention from American and Janpanese companies due to their advantages,such as high efficiency,noise-free and pollution-free.Based on the parameters of HeLi CDD10-070 electric forklift,this paper designed a hybrid topology with a Proton Exchange Membrane Fuel Cell(PEMFC)as the main power source and a lithium ion battery(Li-Ion)as the auxiliary power source,meanwhile,the parameters were matched.As the main power source of the hybrid power system,proton exchange membrane fuel cell(PEMFC)is a complex system involving multiple disciplines,and its output characteristics are affected by many factors.The voltage dynamic model of proton exchange membrane fuel cell(PEMFC)considering the effect of electric double layer capacitance was established,which were proved and simulated on Matlab/Simulink platform.Besides,the self-humidifying DXFC-200 proton exchange membrane fuel cell and fuel cell test system were made by the laboratory.On the basis of the single factor longitudinal analysis and further orthogonal experiment,the multi-factor lateral comparison was carried out.The results showed that the operating temperature exerts a more significant effect on the output characteristics of the battery.On the basis of completing the hybrid system topology design,power source matching and detailed research on the main power source-PEMFC output characteristics,the simulation models of the fuel cell,battery,DC/DC converter and the power-followed energy management strategy were established in the Matlab/Simulink platform,which provides a platform for the subsequent simulation analysis and energy management strategy.A power followed energy management strategy was proposed for the hybrid power system,and the power demand of the forklift was measured under different working conditions.The simulation analysis was carried out by builting model and measuring conditions to verify the effectiveness of the matched power source and energy management strategy.Finally,based on the modeling and simulation,a set of PEMFC hybrid system shrinkage experimental platform was built,using the electronic load to simulate the condition of the forklift for experimental verification.The results showed that the power-followed energy management strategy can effectively realize the reasonable distribution of PEMFC and battery power to meet the load power demand.