Misalignment-Resilient Control Scheme for Bidirectional Power Transfer in IPT Systems

This work proposes a control scheme aiming at increasing the resilience of an inductive power transfer (IPT) system designed for charging of electric vehicles (EVs) against misalignments that are expected to occur in practice between the two coils at both sides of the magnetic coupling. The control tasks carried out on the wireless power transfer with the proposed approach are managed solely from the EV side, simplifying thus the operation of the power electronics located in the parking space. For this purpose, two control loops are designed, controlling both the vehicle DC bus voltage on the EV and the battery current. Besides, an expert control layer improves the robustness of the IPT system against changes in the magnetic coupling coefficient. The validity of the proposed control scheme is assessed through a Hardware-in-the-Loop (HIL) emulation of the IPT system. The obtained results demonstrate the benefits of adding the expert control layer on the performance of the IPT system, while the tracking of the reference signals is accomplished with smooth transitions.