Research On Control System Of Vehicle-mounted Magnetic Suspension Flywheel Battery System Under Complex Disturbances

With the rapid development of the new energy vehicle industry,lithium battery,as a power battery,has increasingly become a key factor limiting the driving range and power performance of vehicles.Magnetic suspension flywheel battery has the advantages of high charging and discharging efficiency,low standby loss and long working life,so it is very suitable for vehicle battery.However,due to the variable characteristics of on-board working environment,vehicle flywheel battery system needs to pay special attention to flywheel instability caused by working condition interference.Therefore,this thesis analyzes the influence of operating condition interference on the operating stability of vehicle-mounted flywheel battery,and studies the modeling method and control strategy suitable for suppressing operating condition interference.The main contents of this thesis are as follows:1.Firstly,the application prospect of vehicle-mounted flywheel battery in the current new energy vehicle industry is introduced,and the working mode and structure of the system combined with new energy vehicles are explained.The research status of the flywheel battery at home and abroad is expounded and the key technologies which need further research in the application of the system in the vehicle are pointed out.2.Aiming at the problem of poor stability of the current cylindrical magnetic bearing supported flywheel battery in vehicle-mounted applications,the suspension force modeling of the centripetal magnetic bearing supported flywheel battery system with strong disturbance resistance was analyzed.And then a set of universal accurate modeling theory is proposed.The experimental results show that the improved Maxwell tensor method can improve the accuracy of the model compared with the equivalent magnetic circuit method.The performance test results show that the model based on this method can make the flywheel have better immunity.3.Aiming at the problem that most of the current researches on vehicle flywheel battery suspension control system focus on designing simulation and experiment through single signal simulation condition.And lack of research on the characteristics of the same vehicle driving condition,a dual-mode coordinated control strategy based on the driving condition characteristics is proposed.Taking the centripetal maglev support system of a vehicle flywheel battery as an example,the kinematics simulation of typical working conditions is carried out by ADAMS(Automatic Dynamic Analysisof Mechanical Systems),and the motion characteristics of the flywheel battery under different working conditions are analyzed in detail,and the operating conditions are combined with active disturbance rejection control.Finally,the experimental results show that the control strategy can effectively improve the stability of flywheel rotor system in vehicle-mounted environment.4.Based on the requirements of operating condition test,a complete operating condition test platform for vehicle flywheel battery system is built.The digital control system of magnetic suspension support system is designed and built,and the algorithm program of software control system is written.On this basis,the performance verification experiment and working condition verification experiment are carried out.The experimental structure verifies the correctness of the centripetal magnetic bearing precision modeling theory based on the general modeling theory and the effectiveness of the dual-mode coordinated control strategy based on the working condition characteristics.