Research On Contactless Inductive Power Transfer Technology And Application Of Medium-speed Maglev Train

The traditional current rail power supply can't meet the demand of 200km/h medium-speed maglev train train.As a new power supply scheme,contactless inductive power supply technique has the advantages of high efficiency,environmental protection,low maintenance cost and etc.,which could provide stable and reliable power for the medium-speed maglev train.In this paper,the influence of parameters on system performance is analyzed,the key parameters such as mutual inductance and working frequency is optimized,and the serial resonant inverter is studied.Finally,a contactless inductive power supply experimental platform is built to realize the efficient and stable transmission of electric energy.The main contents of this paper are as follows:1.A design scheme applied to medium-speed maglev contactless power supply system is proposed,the mutual inductance model of the contactless inductive power supply system is established,the effect of different parameters on the system transmission efficiency and output power is studied.The priority order of parameter optimization is proposed.2.In order to obtain the stronger coupling performance,the finite element of simulation(Ansoft)is used to study the change rule of coupling device in relative coil structure and different ferrite distribution,and the optimized design scheme is proposed.3.The series resonant high frequency inverter is studied to improve the performance of the inverter when the work frequency is increased at the same time.The influence of the dead-time on inverter performance is analyzed and the optimal dead-time setting range is proposed.The simulation results of Pspice show that the reasonable dead-time setting can improve the inverter output performance effectively.4.The experimental platform is built on the basis of the research above.The experiment results show that the optimization design of inductive coupling device and increasement of the working frequency can improve the system performance effectively.The single pickup coil is able to achieve 4kW contactless power transmission and efficiency above 80%,which verify the feasibility of the contactless power supply scheme on medium-speed maglev train.