Power Fluctuation Suppression Method for EV Dynamic Wireless Charging System Based on Integrated Magnetic Coupler

In the electric vehicle dynamic wireless charging (EVDWC) system, when the electric vehicle (EV) drives from one track to the next, it will produce output power fluctuation. This article proposes a multicoupling LCC-compensated method for EVDWC system based on an integrated magnetic coupler to suppress the power fluctuation. The magnetic coupler includes three couplings. The first coupling is between the main coils. The second coupling is between the adjacent compensation inductor coils integrated into main coils. The third coupling is between the primary compensation inductor coils and the secondary compensation inductor coil. The main coils are unipolar and the compensation inductor coils are in a double D structure. The parameter matching rules and optimized design process considering the additional cross-couplings are given. The main advantage of the proposed method is to realize compensation inductance using coupling coils, thereby adding two cross-couplings, and to suppress output power fluctuation based on system normal operation without adding new components. A prototype is designed and implemented to validate the proposed magnetic coupler and parameter design rules. Experimental results show that the output power fluctuation is within ±4% during dynamic charging at a power level of 12 kW, and the maximum efficiency reaches 92.3%.