Research progress on dynamic wireless charging systems for electric vehicles

The proposal of dynamic wireless charging (DWC) provides a new idea for the development of new energy vehicles, that is, charging while driving the car to reduce unnecessary waiting time, because in the process of electric vehicle driving, the mutual inductance coefficient between the coils will inevitably change greatly, resulting in the system in an unhealthy working state for a long time and the output power can’t be stabilized within the rated range. In recent years, a large number of research methods have been proposed to address the problem of power fluctuations. These methods can be broken down into three main areas: changing the coil structure, optimizing compensation, and applying a controller to stabilize the output power. In this paper, the mutual inductance and voltage fluctuation problems of dynamic wireless power transfer (DWPT) systems are analyzed, and then the current research progress on magnetic coil structure, compensation network topology and control scheme is expounded, and finally the research progress is summarized and prospected.