Output Voltage Fluctuation Damping for Dynamic Wireless Power Transfer System of EVs Based on Sensorless Disturbance Rejection Control

This article develops an advanced control scheme aimed at mitigating disturbances in the dynamic wireless power transfer system (DWPTS) utilized by electric vehicles (EVs) with a low-cost implementation. Each EV faces challenges such as prolonged charging duration and range anxiety. To address these challenges, a DWPTS with output voltage regulation is developed, ensuring a stable and continuous power supply for EVs. Specifically, a third-order sensorless extended state observer (ESO) is designed to recover the lumped disturbances within the control circuit. A nonlinear tracking differentiator is employed to obtain a smooth signal for the controller. Additionally, a nonlinear state error feedback control law integrating discontinuous control technology is devised to generate the target control signal for the control circuit. Subsequently, all state errors are proven to be input-to-state stable through Lyapunov theory. A notable feature of the improved approach is its ability to reduce sensor quantity and implementation costs, further enhancing the stability and feasibility of the DWPTS. Simulation and experiment are provided to validate the efficacy of the designed control scheme in damping output voltage fluctuations in the DWPTS.