Robust Voltage Regulation in Dynamic Wireless EV Charging Systems via Dual-Frequency Oscillation Suppression

This article designs an enhanced voltage regulator for dynamic wireless charging system (DWCS) in electric vehicles (EVs) with dual-frequency oscillation suppression. The DWCS aims to alleviate EVs’ range anxiety issue by ensuring continuous power supply. However, DWCS faces complex disturbances such as sensor measurement noise and varying coil mutual inductance with EV movement. To mitigate these challenges, we propose a feedforward Kalman filter-based fixed-time antidisturbance control (FADC) scheme for DWCS, aiming to implement robust voltage regulation with improved dynamic response and oscillation suppression. Specifically, we integrate a Kalman filter into the controller's feedforward loop to predict low-frequency state information. Subsequently, a fixed-time extended state observer is devised to recover variations in the mutual inductance and other external disturbances. Then, a fixed-time antidisturbance control law is designed utilizing state prediction and disturbance estimation to produce the targeted control signal for the DWCS. Furthermore, we employ the Lyapunov stability criterion to demonstrate that the track errors remain bounded within a fixed-time frame. A notable advantage of our scheme is its capability to simultaneously address low-frequency voltage oscillations resulting from variations in the mutual inductance of DWCS, and high-frequency voltage oscillations resulting from measurement noise of sensors. Finally, experiment results validate that the proposed scheme effectively achieves dual-frequency voltage oscillation suppression for DWCS while enhancing dynamic response performance.