Design Of A Piggyback Fuel Cell Power Generation System For Emergency

Aiming at the power demand of the application of disaster relief and survey,this thesis proposes a fuel cell hybrid system.The system consists of a fuel cell,battery.DC/DC converter and controller,the main research contents are as follows:Firstly,the topology of fuel cell hybrid system is designed,a topology that separates the discharging and charging is proposed.The ideal diode circuit is designed and used for anti-reverse protection of lithium battery.The 4-switch buck-boost converter is designed for management of battery.Secondly the logic threshold strategy and fuzzy control algorithm are introduced into the energy management of the hybrid system,and the system is simulated and verified based on Matlab/Simulink.The simulation indicates that power management strategy can suppress the spike current of the fuel cell when the load increases instantaneously,avoiding damage to the fuel cell.The control strategy of the air-cooled fuel cell is proposed and the controller is designed.Finally,the hardware circuit and software of each unit of the system are developed,and the system prototype is developed.The weight of the system is 12.5kg,and the capacity of the system is 8kWh.The energy density of the system is 640Wh/kg,which meets the original design goals.