Modeling and analysis methods for the DWPT system applicated in EVs charging

The difficulty of modeling a dynamic wireless power transfer (DWPT) system for Electric Vehicles(EVs) charging is that its mutual inductance changes with the coil offset, so we have to build a dynamic model of the system. In this paper, we propose a modeling method by using equivalent circuit method and state space averaging. Moreover, based on the set of system parameters, comparing the results of the simulation experiment with the result of the model calculation. At last, the performance indexes of the system under the different buck duty cycle are observed. The simulation results of these indexes are also basically consistent with the model calculation results, which further verify the accuracy of the model. At the same time, we found that the selection of duty cycle has a great influence on the performance indexes.