Modeling And Advanced Compensation Control Methods Of Dynamic Wireless Power Transfer System For Electric Vehicle

As the environment and energy issues become increasingly prominent,electric vehicles as a kind of new clean energy vehicles are gradually being taken seriously.However,the popularization and application of electric vehicles are limited by power battery technology,and electric cars have hidden electrical safety problems when charging by plug-in.In view of the above problems,the dynamic wireless power transfer technology of the electric vehicle provides a feasible solution.For electric vehicle dynamic wireless power transfer technology,electric vehicles switch between sections of rail,the secondary side should be detached from working state after re-enters the working state of system;changing the relative position of the primary and secondary will cause fluctuations of system.In these two cases,the response speed of the system should be fast enough to make the load stable energy supply as soon as possible,and the faster the speed of the electric vehicle,the higher the requirement for the performance.To solve the above questions,this study based on the generalized state space average method to establish the state space model of electric vehicle wireless power transfer system,and on this basis,the response characteristics and advanced compensation control strategy of dynamic system are researched.By using the established state space model of system,the influence of the internal parameters of the SS topology and the LCL-S topological system on the dynamic characteristics of the system is analyzed respectively.The analysis shows that the filter capacitor of the secondary side rectifier circuit has the greatest impact on the overall dynamic response of the system,and that the filter capacitor and the mutual inductance of the coupling mechanism are not selected properly will lead to instability of the system.The method of analysis is instructive to system design and optimization.By using the state space model of the system,a state feedback based pre compensation control strategy is proposed to control the dynamic wireless power transfer system with advanced compensation.The SS structure and LCL structure of the system controllability and observability are analyzed.The pole position and the method of pole assignment of high order system are researched and using this method,controllers for SS dynamic wireless power transfer system were carried out for the secondary side control and the primary side control.The designed controller reduces the response time of the system and increases the stability of the system.A experiment platform of dynamic wireless power transfer system is designed and implemented.The system experiment platform can realize the functions of the primary and secondary side control respectively.The dynamic performance of the controller is verified by this system.Aiming at the mutual surge electric vehicles running in the process,the experimental verification has been done using a large dynamic experimental platform,the derived controller in the system with 10m/h speed to maintain constant output.The research results of this paper provide a new analysis and control method for the dynamic wireless power transfer technology of electric vehicles,which can promote its engineering application.This project is supported by National Natural Science Foundation of China,"Research on dynamic wireless power transfer technology of urban electric vehicles based on magnetic coupling resonance".