Modeling And Dynamic Simulation Of Proton Exchange Membrane Fuel Cell

Fuel cell is an electrochemical device which will continue to supply a fuel and oxidizer in the chemical energy into electrical energy continuously. Fuel cells are recognized as efficient, convenient, environmentally friendly energy device. In many different types of fuel cells, proton exchange membrane fuel cell (PEMFC) have broad application prospects in the public and civil, military and national defense, whether as a mobile Distributed power supply because of its low temperature, fast start, high energy density, long life etc. Thus, studying of proton exchange membrane fuel cell system dynamic performance and the main factors using experimental setup and thermodynamic model has important theoretical and practical significance for promoting the use of proton exchange membrane fuel cell.In this paper, proton exchange membrane fuel cell is recognized as the main object of study, based on energy in the thermodynamic analysis of the system and exergy analysis, power generation systems model of thermodynamic energy analysis and exergy analysis model are established, and using Matlab and the Simulink tools to build the system dynamic simulation mode. The method of combining experimental setup and thermodynamic model is undertaken to investigate the performance of the system for different operating conditions; study of working parameters such as temperature, gas pressure and flow rate impact on the anode polarization curves, the net power output, energy efficiency and exergy efficiency of system technical performance. From experimental results, it is showed that the proposed simulation model results are reliable, and the established model is effective. The main results of this study: 1) The corresponding electrochemical model and thermodynamic model are built based on electrochemical analysis and thermodynamic analysis of the proton exchange membrane fuel cell power system, and set up dynamic simulation model for the proton exchange membrane fuel cell system with the Matlab and Simulink which is a foundation for studying the dynamic performance of the PEMFC; 2) A study of the fuel cell polarization phenomenon is to get voltage polarization curve. It is seen that activation losses are very influential after the start-up of the system and cause rapid initial fall in cell voltage. The ohmic and concentration losses commence to become effective at a current density of about 0.10 A/cm. Due to proton exchange membrane fuel cells have some of the high irreversible loss, so the actual operating voltage makes the system reversible lower than the theoretical voltage; 3) A study of some parameters such as current density, gas pressure, temperature and other parameters impacting on the efficiency of proton exchange membrane fuel cell system is to get related trends and data. The results demonstrate that the performance of a PEM fuel cell increases with the increase in pressure and decreases at high anode stoichiometries; 4) Multi-parameter analysis method is used to find out the temperature, pressure and the anode flow value of the optimum combination of operating parameters, which can make the efficiency of the system maximum given under current and load.The innovation of this paper:PEM fuel cell is recognized as the main object of study, based on energy in the thermodynamic analysis of the system and exergy analysis, power generation systems model of thermodynamic energy analysis and exergy analysis model are established, and using Matlab and the Simulink tools to build the system dynamic simulation mode, and dynamic performance of the system is conducted in order to investigate its performance at different operating condition using experimental setup and thermodynamic model.