Power Management System Design Based On A Model Of Electric Aircraft

Because of Lithium-ion batteries have some advantage such as large capacity, long service time, the security, lower pollution, so Lithium-ion batteries has been widely used in electric vehicles. On account of these advantages of lithium battery, a kind of design concept used by electric power manned aircraft. The aircraft system need higher security as the difference between cars and aircraft, The main problem is equilibrium of the battery during it is charging and discharging; also the system needs to precise calculation the State of Charge(SOC). The research about it is the battery characteristics, model establish, influence factors and SOC algorithm.The first, power management system introduce the equilibrium module for the battery pack and algorithms for the SOC. Using two kinds of schemes(the energy consumption and transfer) combining as the equilibrium strategies. Through the method of Open circuit voltage(OCV) and SOC experience curve to get influence factors, which works in the battery discharge process, thus establish the battery model, then on the basis of the model using the voltage and current data calculate SOC, using the extended kalman filter(EKF) algorithm correction results. Second the paper according to the specific requirements of aircraft battery system to design battery management system hardware. Upper computer use ATmega16 microcomputer, battery monitoring chip select LTC6804, which production in Linear Technology Corporation. ATmega16 obtain the data of each monomer battery from the LTC6804, according to the data of the abnormal state of the battery to take the appropriate treatment method and balance the battery pack monomer battery energy. Finally it uses the simulink software to analysis reliability of the system.