Research On Fault-tolerant And Equalization On Aircraft Battery Power Supply

Aircraft batteries can be used to start aircraft engines and auxiliary power units(APU),also it can supply power to the aircraft suffering in a loss of electric power to ensure the safe flight of the aircraft.In practical use,battery cells will have problems including performance degradation,different degradation rate of cells,capacity and service life degradation,battery failure,and even occurrence of serious accidents.In addition,aircraft battery power usually has reliability and fault tolerance requirements.Therefore,the study of fault-tolerant and equaliation technology of aircraft batteries has great scientific significance and engineering application value.This paper mainly studies the fault-tolerant and equalization technology of aircraft battery power.The specific research contents include:(1)Design an aircraft battery power supply architecture.To solve the problem of fault isolation requirement,a fault-tolerant architecture and graded fault-tolerant control strategy for battery power system is designed.To solve the problem of inconsistency of battery,a method of active equalization management based on Bubble Sort(BS)for battery cells is given.The battery power architecture provides fault-tolerant and balanced management of a series battery consisting of 22 Ni-Cd cells.(2)Design and build the prototype of aircraft battery power system.The hardware part of the design includes control circuits,data acquisition circuits,communication circuits and reconfigurable circuits.The software part of the design includes the basic functions of the system,battery fault-tolerant control procedures and battery equalization control procedures.(3)Set up an aircraft battery power experimental platform to finish the aircraft battery power system test,and conduct battery power fault-tolerant experiments and equalization experiments.The experimental results show that the proposed system scheme is feasible and effective,and fault cells can be isolated quickly to greatly reduce the inconsistency of battery cells and improve the capacity and remaining useful life of the battery power system.