Design and Analysis of Adaptive Tuning Wireless Power Transfer System at Transmitter Side of Segmented WPT System

ABSTRACT As the process of Industry 4.0 advances at a high speed, wireless power transmission (WPT) technology is developing at a high speed due to its advantages of dust‐free and efficient energy supply. Currently, the conventional multisegment wireless power transmission system (MSWPT) suffers from the problem of high bus voltage due to mutual coupling at the intersection of multiple tracks. In this study, an adaptive tuning control scheme based on a saturable reactor (SR) is proposed, which aims to solve the problem of high DC bus voltage and related device voltage stress caused by cross‐coupling between tracks without detuning the system. Firstly, a cross‐coupled multitrack model is established based on a two‐port network and the effects on the high‐frequency inverter and DC bus voltage under different operating states are analyzed; secondly, it is proposed to introduce an SR as adjustable impedance in the proposed LCC compensation topology to perform the tuning; and lastly, a transmitter‐side MSWPT system equipped with two sections of 10‐m tracks is constructed in this study. The system realizes the backward voltage suppression effect under the operating condition of 80‐A track current, achieving an 84.8% reduction in bus voltage (from 606 to 92.2 V).