Study On The Gas Humidification Control Strategy Of Proton Exchange Membrane Fuel Cell

The proton exchange membrane fuel cell(PEMFC)has been widely concerned in many countries because of its high efficiency,low working temperature and no pollution.This thesis mainly focuses on the effect of gas humidification system on the temperature and humidity of gas in proton exchange membrane fuel cell,the existing problems in the application of the existing traditional control algorithms to the humidifier control system are studied,through comparative analysis,control strategy and optimization algorithm of gas humidification system are put forward,and good control effect is achieved.In this thesis,the control strategy of gas humidifying system for proton exchange membrane fuel cell is studied and analyzed,the specific contents are as follows:Firstly,based on the analysis of gas humidification system and humidification principle of PEMFC,a gas humidification control scheme for proton exchange membrane fuel cell is proposed.Secondly,according to the humidification control system,the mathematical equations of the humidification system were analyzed by using the principles of electrochemistry,thermodynamics and fluid mechanics,and then,the dynamic model of the whole humidifying system is built under the environment of Matlab/Simulink.Thirdly,according to the established system model,the temperature and humidity response of the system under the control of the fuzzy PID and the PID control of BP neural network is compared and analyzed.Then the optimization algorithm,multi variable fuzzy adaptive predictive control algorithm is proposed,and its control effect is simulated and analyzed.Fourthly,combined with the gas humidifying control scheme of proton exchange membrane fuel cell,the hardware and software of the system are designed.The hardware design includes the selection of CPU,the control circuit of the fan and the heater,the temperature and humidity acquisition circuit,the CAN communication circuit and the power conversion circuit.The software design includes the CAN communication software design,the sampling program design,and the upper computer interface design based on the Labview software.Finally,according to the platform built on the proton exchange membrane fuel cell humidification control system,the actual control effect of the proposed optimization algorithm is verified,and the anti-interference ability is observed through load change.