Passivity-Based Controller of Dynamic Wireless Power Transfer System

Abstract

Electric vehicle has been promoted widely around the world. However, the traditional charging method needs long charging time and has fixed charging position that is inflexible, which shortens the effective working time of electric vehicle. In order to solve these problems, a dynamic wireless power transfer (DWPT) system is designed in this paper. During the driving of the car, the coupling coefficient between transmitter coil and receiving coil will change dramatically. In this case, the passivity-based controller (PBC) with a DC/DC buck converter is proposed to maintain the stability of output current, thus to increase the working power and efficiency. Finally, a DWPT simulation model is established in PLECS. Simulation results demonstrate that the PBC control strategy can not only ensures the stability but also achieves fast convergence to the desired working point. Besides, the soft switching of the system has been realized.