Optimal Design Of Conmpensation Network In Dynamic Wireless Power Tranmission System

Electric vehicle(EV)is one of the main strategies to deal with the energy and environmental crisis,but its wired charging mode has such problems as low security,large footprint,limited charging quantity and so on.Using radio energy transmission technology to realize the dynamic charging of electric vehicles has become an effective scheme to solve the above problems,so it has become a hot topic in the research of current scholars.The biggest problem faced in the dynamic wireless power transmission system,is how to ensure the small volatility of the transmission power in the case of the fluctuation of the coupling coefficient.There are three solutions to this problem:one is to reduce the fluctuation range of coupling coefficient by using multi-coil mode;the other is to design different structures of transmitting and receiving coils to increase their offset;Thirdly,the high-order compensation network is used to weaken the influence of coupling coefficient change on the transmission power of the system.The first two schemes do not fundamentally solve the problem that the system transmission power fluctuation is caused by the fluctuation of coupling coefficient,while the latter is difficult to solve because of the existence of many compensated network structures.The optimal structure of the compensation network and the parameters of the compensation elements are determined.In view of the above problems,this paper firstly defines the requirements of the dynamic wireless power transmission system and the objective constraints in its application background.Secondly,in view of many problems that compensation network is difficult to optimize,the unified model of compensation network is put forward,and the mathematical model is established,and the relationship between each design index of the system is deduced.Then,it discusses how to obtain the minimum transmission power volatility and the maximum transmission power when the coupling coefficient fluctuates,and how to ensure that the input impedance of the system is at zero impedance angle when the coupling coefficient is maximum,so as to improve the transmission efficiency.After synthesizing the above requirements,the parameter equations of the related compensation elements are given.Finally,in the In PSIM,a simulation model is built to verify the correctness of the theoretical analysis,and an experimental platform is designed to verify the above theoretical analysis and simulation results.