Robust Adaptive Output Regulation for EV Dynamic Wireless Charging System With Sinusoidal Disturbance of Unknown Frequency
Mengting Zhang, Zhitao Liu, Hongye Su
Abstract
This article proposes a control strategy for electric vehicle (EV) dynamic wireless charging (DWC) system subject to sinusoidal disturbance with unknown frequency. The power fluctuation issue arising from the EV motion is an inherent problem of the segmented DWC system. The mutual inductance variation between the receiver coil and the transmitter coils results in a periodic disturbance whose frequency typically depends on the vehicle speed and the coil arrangement. The objective of the controller is to maintain a constant output voltage for the DWC system by compensating for such disturbance based on the adaptive output regulation theory. As a key component of the proposed controller, an internal model-based regulator that is robust with respect to uncertainties on the system parameters is designed. Especially, the frequency parameter of the internal model is adapted in order to cope with the unknown frequency of the disturbance. Finally, both simulation and experimental results verify the effectiveness of the proposed control strategy. A DWC prototype is constructed, and the results demonstrate the satisfactory set-point tracking and rejection of an unknown sinusoidal disturbance caused by the EV motion compared with other traditional methods.