| The gradual consumption of energy and environmental pollution are the problems that the world’s development confronts.The traditional fossil energy has the disadvantages of low power generation efficiency and serious emissions problems.As the most promising power generation device in the 21 st century,fuel cells have the characteristics of high power generation efficiency,convenient operation and pollutionfree.Among them,Proton Exchange Membrane Fuel Cell（PEMFC）has the advantages of specific power,high specific energy and long service life.And it has been well commercialized in distributed power stations,pure electric vehicles and marine power systems.Therefore,research on the modeling and output voltage control of proton exchange membrane fuel cells and mastering the characteristics of fuel cells have great practical value for the application of fuel cells.In this paper,a certain domestic brand of proton exchange membrane fuel cell power generation system is taken as the research object,based on the MATLAB/Simulink platform,the steady state and dynamic modeling simulation of the battery is carried out and the factors affecting the output performance are analyzed and then the power system as a whole model is set to compare and contrast test bench data,at last,an adaptive fuzzy PID controller is designed to control the fuel cell output voltage of the fuel cell.The main research contents are as follows:（1）With an overview of the characteristics of various fuel cells,this paper expounds the working principle,the main components and characteristics of PEMFC demand.Based the electrochemical theory,a steady state model of the battery is set up to analyze the inlet pressure,working temperature and the effect water content of membrane brings to the performance of the pile.The dynamic performance of PEMFC simulation experiment is carried out.The results show that the simulation results are consistent with the experimental data and can reflect the characteristics of PEMFC.（2）By studying the working process and system composition of the actual fuel cell power generation system,the power generation system is divided into five subsystems such as air supply system,hydrogen supply system,cooling system,power stack,and power management.With the analysis of working process of the five subsystems and the component of equipment,fuel cell electric pile and the mathematical model of each auxiliary system are established.Using MATLAB/Simulink platform,the whole model of power system is built to compare the simulation results with the test bench data to verify the exactness of the model and the rationality.（3）The conventional PID controller and the adaptive fuzzy PID controller are designed to control the output voltage of the PEMFC.The control of the two control strategies is compared by simulation experiments effect.The results show that compared with the control effect of conventional PID control effect,the adaptive fuzzy PID controller has certain advantages with less regulation and shorter control time. |
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