(1. 中国科学院电力电子与电气驱动重点实验室, 中国科学院电工研究所, 北京市 100190;2. 汽车安全与节能国家重点实验室, 清华大学, 北京市 100084; 3. 北京电动车辆协同创新中心, 北京市 100081)

The dynamic wireless charging system can significantly reduce the weight and size of electric vehicle(EV)power batteries. Hence it has broad application prospects. A state-space model of dynamic wireless EV charging system is developed first based on the segmented multi-track scheme. Also, a system small-signal model is obtained to describe the dynamic characteristics. Then, with the help of an experimental platform and the actual values of system variables, dynamic changes in system output power and efficiency are analyzed in the dynamic charging process. Furthermore, the transient characteristics in the track switch-on process are investigated, as is the influence of switching position. Meanwhile, experiments are conducted to verify the proposed model and analysis conclusions. This work is supported by National Natural Science Foundation of China(No. 51507168), National Key Technologies R&D Program(No. 2015BAG17B06)and Beijing Municipal Science and Technology Project(No. D15110900290000).