Research On Control Of Gas Supply System For Proton Exchange Membrane Fuel Cell

As a highly efficient and environment-friendly power generating device,directly converting chemical energy into electric energy directly,the fuel cell(FC)can provide a sustainable source of electrical power.The proton exchange membrane fuel cell(PEMFC)is the new generation of FCs,which have become a promising clean energy technology.The PEMFC not only has the complementarities with the solar energy,wind energy and other renewable energy sources,but also has the advantages of low operation temperature and environmental pollution,flexible use and so on.It is suitable for the portable power,hybrid electric vehicle and distributed power station and other applications.However,the short lifetime and high cost have restricted the progress of PEMFC commercialization seriously.Aiming at the issues of nonlinearity and strong coupling between the hydrogen pressure and oxygen pressure in PEMFC gas supply system and the poor traditional control method,a more advanced decoupling control strategy with an improved and advanced algorithm is proposed.The main content is as follows:First of all,the paper describes the significance,development and present situation of PEMFC system.A brief overview is conducted on the application of PEMFC in electric vehicle,especially the hybrid power system,as well as the operating principle and basic mechanism of PEMFC.Based on the introduction of PEMFC gas supply system,the influence of gas pressure of PEMFC cathode and anode on the input performance of FC has been analyzed through the simulation experiment.Secondly,according to the operation mechanism of PEMFC,idea gas equation and related theories,the dynamic PEMFC system mathematical model has been established.When the inputs is gas flow rates,outputs is gas partial pressures and the current is disturbance,the nonlinear and coupling PEMFC system has been simulated by using the MATLAB/Simulation tools.Finally,based on the established model,a hybrid intelligent adaptive decoupling control method is presented to adjust the gas pressures of PEMFC in idea value under variation load.The improved genetic algorithm(GA)has been utilized to optimize the PI parameters,and the fuzzy adaptive PI algorithm is used to adjust PI parameters dynamically online and to realize the decoupling of the PEMFC gas supply system.Based on the proposed dynamic model,the PEMFC gas supply system with fuzzy-AGAPI decoupling control method is simulated by Matlab/Simulink.The simulation results show that the proposed control strategy can effectively reduce the pressure difference between hydrogen and oxygen supplies.