Intelligent Control System Design Of Hydrogen Fuel Cell

The working principle of hydrogen fuel cell is simple, basically, oxidant supplied incathode and hydrogen supplied in anode will be reacted using catalytic, then fuel cells willprovide power, heat and produce water, which is more friendly to environment than originalbattery and crude oil. So it is a green, clean, high efficient and recyclable new energy. Withthe fossil fuel decreased and problem of energy crisis on earth, it is worth developing andapplying in future.Currently, hydrogen fuel cell can be divided into five kinds according to the differentelectrolytes, for PEM fuel cells, it can start quickly at low temperature, power on/offrepeatedly, operate with low noise, etc. so, it is very suitable in portable, transport andstationary applications. But, in order to work properly for long time and to improve theefficiency, it is necessary to design a good and robust control system for PEM fuel cells,including water and heat management. This thesis, after analyzing the principle andcharacteristics of PEM fuel cells, concludes a simple and practical strategy for water and heatmanagement, the main workings are listed below:Firstly, reviews the history of fuel cell, physical structure and working principle of themainstream of hydrogen fuel cell.Secondly, describes the effects of temperature, pressure and humidification to PEM fuelcells, and the importance of water and heat management.Thirdly, designs a control system for PEM fuel cells based on STM32F103, includingsoftware and hardware design; Transplants the FreeRTOS RTOS based on IAR to makeprogram more modularized; then, analyzes the performance of PEMFC system using fuelcells stack’s voltage, current and hydrogen pressure sampled by controller.Forth, implements the digital PID algorithm to control the fuel cells stack temperature,and finds a best current temperature curve by experimenting repeatedly; then, control thewhole system to run automatically and protect the whole system.Finally, designs a LabVIEW program to receive the data send by STM32F103, to display,store and plot in order to analyze performance of fuel cell stacks conveniently.After testing, the whole system operates normally and stably, and can respond quicklywhen errors occur. So there is a certain practical and promotion value in fuel cells field.