Constant maximum power control for dynamic wireless power transmission system

Dynamic Wireless Power Transmission (DWPT) uninterruptedly charges the moving Electric Vehicles (EVs) through the powered roadway, providing a potential solution to the battery bottleneck. EVs need to obtain energy as much as possible to guarantee proper functioning. Meanwhile, it is necessary to fully utilize the powered roadway in order to economize energy and reduce paving cost. Based on the selected sectional track and detuned series-series (SS) topology, a Constant Maximum Power Point Tracking (CMPPT) control method in the secondary side without the real-time communication between primary and secondary sides is proposed. This method uses the perturbation of rectified DC voltage and tracks the maximum power point. Thus the DWPT system transfers constant and maximum power regardless of the varied magnetic coupling coefficient. A scale-down DWPT demonstration platform based on sectional track is built. The experimental results demonstrate the validity and feasibility of proposed control method for EVs where nearly constant and maximum power is received even when the coupling coefficient varies from 0.13 to 0.28.