Research On Power Management System Of Fuel Cell UAV

With economic development and social progress, environmental problems and energycrisis have come to arouse attention from people. Because of its high power density, highenergy conversion efficiency, no noise, no pollution and wide operating temperature rangeand other good performance, fuel cell has been significantly developed and widely used. Butthere are also problems to be solved. Instantaneous power of fuel cell is too low. Frequentdischarging damages the battery seriously. So it requires power management system tomanage the fuel cell. This thesis focuses on design of the fuel cell UAV power managementsystem and fuel cell remaining power estimation.In this thesis, fuel cell characteristics were studied and the main factors that affectremaining power were analyzed. A new battery model applied to fuel cell was established.The model describes the dynamic characteristics well. System integrated module designincludes hardware design and software design. Hardware system is designed based on DSP,which takes TMS320LF2407as the main control chip, combined with LTC6802andDS18B20. Integrated circuit reduces the wiring and avoids the overstaffing and unwieldinessin independent components circuit. Real-time acquisition and processing of multi-section fuelcells’voltage，current and temperature was done in the system. The system adopts CANcommunication, which is quick and easy. Program for each module was written in softwaredesign, which achieves the main function of the system and ensures safe, reliable and efficientoperation of the entire power management system in associated with hardware system.Current integral method and Kalman Filtering was combined to estimate fuel cellremaining power. By complementing two methods, it takes online and real-time measurement,which meets frequent load variations and unexpected flying conditions estimation and getsexact remaining power estimation value.