Research On The Design And Energy Management Of Fuel Cell Hybrid Power System

The emergence of new energy vehicles has alleviated the energy shortage and effectively improved the global greenhouse effect.Compared with pure electric vehicles,fuel cell vehicles do not have short range,long charging time and other shortcomings,is the only way to achieve sustainable development in the future,is likely to become the mainstream of the automobile industry,and further improve the quality of life of people.This article takes the fuel cell hybrid power system as the research object.First,the various topological structures and definitions of the hybrid power system are deeply analyzed,and the advantages and disadvantages of fuel cells,batteries and DC/DC converters are discussed and analyzed.On this basis,the topology of the hybrid power system is designed,and the scope of application of the degree of hybridization is proposed.Then,to meet the requirements of the power and equipment safety of the experiment,the fuel cell,battery and DC/DC conversion were selected and parameter matched,and the information collection and control system were designed to realize the hybrid power system.Information collection and control functions.Secondly,in order to achieve the optimal control of the hybrid power system,based on the analysis of the air-cooled fuel cell/lithium-ion battery,the voltage model and temperature model of the air-cooled fuel cell are established,and the temperature model is mainly analyzed.The heat distribution of the battery is divided into three parts,which are the heat generated by the fuel cell,the heat taken by the blower,and the heat from the natural convection surface.The generation and dissipation of heat form a closed-loop control of the temperature of the fuel cell;in addition,Rint is used.Equivalent circuit,the equivalent model of the battery is established;at the same time,the boost DC/DC model is established.The output of the external circuit of the fuel cell is analyzed,and the simulation calculation results are basically consistent with the actual measurement data.Finally,considering the maintenance of battery state of charge,use cost,maximum braking capacity recovery and adaptability of working conditions and other influencing factors,a rule-based energy management strategy and a hierarchical model prediction are designed respectively.Control(Hierarchical Model Predictive Control,HMPC)energy management strategy.HMPC is to improve the stability of system control under the premise of fully considering the economy of fuel use.Based on the experimental results of the US06 standard operating conditions,the equivalent hydrogen consumption of the HMPC energy management strategy is reduced compared with the Rule-based energy management strategy system,which improves the overall efficiency and fuel economy of the system.