Research On Dynamic Characteristics Of PEMFC Engine Air Management System Based On Dynamic Model

Proton exchange membrane fuel cell(PEMFC)engine is a kind of power device which converts hydrogen energy into electric energy.The working process involves many fields,such as electrochemical reaction,physical state change,temperature change and liquid flow.As an important part of PEMFC engine,air management system is mainly responsible for providing a certain temperature,humidity,pressure and flow of air for the reactor.It plays an important role in the fuel cell system.Its operating conditions directly affect the performance of the reactor.To study the dynamic characteristics of the air management system of PEMFC engine and analyze the influence of typical sensitive parameters on the output performance of PEMFC is of great significance for ensuring the normal operation of PEMFC engine and improving the working efficiency and reliability during operation.The main research contents of this paper are as follows:(1)Study the operation mechanism of PEMFC engine air management system,and analyze the influence of typical sensitive conditions of air management system,such as temperature,humidity and pressure,on fuel cell performance.The dynamic model of the air management system of PEMFC engine is built based on AMESIM software,and the polarization curve obtained by simulation is compared with the experimental results to verify the accuracy of the model.(2)Set NEDC working condition and a step demand power for simulation test,the model can respond quickly,no impact phenomenon occurs when the step change,verify the feasibility of the constructed model in the actual study.Based on the model,the dynamic characteristics of the air management system are studied,and the influence of typical sensitive conditions such as temperature,pressure and humidity on the output performance of PEMFC is analyzed.(3)Based on the experimental method,the dynamic characteristics of the air management system of PEMFC engine were studied,and the actual operating performance of PEMFC was tested under different temperature,pressure and humidity conditions.The reliability of the simulation results was verified by comparing the simulation results with the experimental results.