Event-triggered H∞ position control of receiver coil for effective mobile wireless charging of electric vehicles

The emergence of dynamic wireless charging technologies brings about new possibilities for on-road real-time charging of electric vehicles in solving the battery bottleneck for the mass roll-out of electric vehicles worldwide. In this new area, charging efficiency is one of the most important issues to be addressed for on-road wireless charging. While most current research mainly focuses on the electronic power design of the charging system, little has been done to improve charging efficiency through real-time mechanical control. In this paper, a switch control strategy based on an event-triggered mechanism is proposed, to improve the charging efficiency when an electric vehicle moves along a power supply road track. An H∞ control problem is formulated and sufficient stabilization criteria are derived in the form of linear matrix inequalities when the electric vehicle derails from the effective charging range. Numerical simulation confirms that the proposed control approach outperforms the general state feedback control method. The developed control strategy is applied to control a newly built electric vehicle wireless charging test platform with desirable control performance.