Modeling And Control Of Flywheel Battery With A Virtual Inertia Spindle Considering Automobile Suspension And Typical Road Conditions

At present,electric vehicles generally use chemical batteries as power batteries.Due to its disadvantages of serious pollution,short life span,etc,the development of electric vehicles is restricted.Further,due to its advantages of high efficiency,low pollution and long life span,the flywheel battery has broad application prospects in the field of electric vehicles.However,when flywheel batteries are used in vehicle-mounted situations,additional disturbances from the automobile vibration system(such as automobile suspension),foundation motion(namely,driving condition),road conditions,etc,will reduce the stability of the magnetic bearing-flywheel system.Among them,the current research on vehicle-mounted disturbance mainly focuses on the foundation motion and is relatively complete.However,most of the research on the autmobile vibration system and road conditions is aimed at the analysis of the dynamic performance of sysyem,without further consideration of the modeling stage.Therefore,aiming at the shortcomings of existing research,this dissertation takes a flywheel battery with a virtual inertia spindle as an example,combines the influence of automobile suspension and two typical road conditions(pulse road excitation and random road excitation)to analyze the dynamic performance of magnetic bearing-flywheel system and modify the magnetic suspension force model.The main research work of this dissertation is as follows:Firstly,the research background,key technology and working principle of vehicle-mounted flywheel battery are summarized.The development of vehicle-mounted flywheel battery and its research on stability is described.Further,the research significance and content arrangement of this dissertation are summarizes.Secondly,taking a flywheel battery with a virtual inertia spindle as an example,on the basis of the static suspension force model based on the equivalent magnetic circuit method,a suspension force dynamic model is established taking into account the influence of automobile suspension and typical road conditions.Then,speed bump is selected as the most common pulse road excitation for analysis.Through the joint simulation of ADAMS and MATLAB,the dynamic response rules of flywheel under the influence of autmobile suspension and speed bump are summarized,further the foundation offset is corrected in the form of main offset points.In addition,the control block diagram of flywheel battery with a virtual inertia spindle based on speed bump condition is established,further the PID control strategies applicable to different automobile suspension are summarized.Based on inverse Fourier transform,a random road excitation model considering vehicle speed is established.On this basis,random road is selected as the most common random road excitation.Through the joint simulation of ADAMS and MATLAB,the dynamic response rules of flywheel under the influence of automobile suspension and continuous random road are summarized,further the foundation offset is corrected by combining main offset points and root mean square.In addition,by adding a pattern recognition module,a control block diagram of flywheel battery with a virtual inertia spindle is established combining the speed bump condition and continuous random road excitation.Finally,the experiment platforms based on two typical road conditions(pulse excitation and random excitation)are built respectively,further the overall process,hardware circuit,software composition and experiment scheme are introduced.In addition,the performance tests are carried out against two typical road conditions respectively to verify the anti-interference ability of the modified model.