Research On Performance Optimization And Air Supply System Control Of Proton Exchange Membrane Fuel Cell For Vehicle

Proton exchange membrane fuel cell is suitable for transportation due to their excellent performance such as working temperature,efficiency,and start-up speed.However,operating fuel cells under vehicle conditions will cause performance degradation and lifespan decline,making it difficult to enter the commercial development stage.To this end,this paper uses the lumped parameter model and 3D numerical model as well as the PEMFC physical test platform and cloud computing platform to study the influencing factors and mechanism of local oxygen starvation that is the important factor causing the performance degradation of fuel cells under vehicle conditions.And from the perspective of air supply,an air supply strategy that can effectively alleviate local oxygen starvation is designed.For fuel cell vehicles,in order to alleviate the oxygen starvation degree of the fuel cell and meet the load demand under variable load conditions,an oxygen excess ratio control method based on the improved extended Kalman filter algorithm and stack power demand is designed.For fuel cell trains,the operating conditions of the train are relatively harsh,especially when the train passes through the tunnel at high speed,the air pressure,temperature and humidity change significantly.In order to analyze the influence of the vehicle condition on the dynamic performance of the PEMFC,the influence of the pressure,temperature,and humidity parameters on the internal mass transfer and output performance of the PEMFC was analyzed,and the installation position of the PEMFC on the train was optimized considering the air pressure parameters and the influence of air pressure fluctuations on the dynamic performance of PEMFC.Through the above research,the effective control of OER under vehicle conditions has been achieved,and the performance of the PEMFC in the application scenarios of automobiles and trains has been improved.The operating conditions affecting local oxygen starvation are analyzed based on three-dimensional simulation and a mitigation strategy is proposed,and cloud computing is used to accelerate the solution.The results show that the area ratio of LOS can be reduced by 18%,and one single simulation time can be shortened by about 250 h.The results of the control of OER based on the IEKF and stack power show that the method can effectively improve the response speed and control accuracy.The degree of oxygen starvation is alleviated which increases from 1.10 to 1.65 and the regulation process decreases from 4.47 to 4.15 s.Finally,considering the application scenario of the fuel cell train passing through the tunnel,the environmental adaptability of the fuel cell is studied.The results show that the change in cathode pressure has the greatest impact on the output performance and internal mass transfer of PEMFC.Taking into account the pressure fluctuation index,the best installation position of PEMFC is located 10 meters before the middle of the train.And air supply system model is improved to realize the preliminary analysis of the influence of pressure fluctuation on the dynamic characteristics of PEMFC.