Control-oriented closed-loop identification and input design in a wireless power transfer system

This study proposes a closed-loop identification scheme for a wireless power transfer (WPT) system that estimates the actual system model and uses it to design and update the controller. Due to factors such as coil misalignment, unknown loads, and capacitor aging, the initial controller may not be suitable for the actual WPT devices. Therefore, this paper focuses on estimating the model during closed-loop operation and updating the controller when performance requirements are not satisfied. To minimize disturbances to normal operation while achieving sufficient modeling accuracy for controller design, this study proposes a method for designing the input excitation signal to minimize output voltage fluctuations. Additionally, a robust controller design method based on the estimated model set is introduced to enhance closed-loop control performance. Experimental prototypes demonstrate the effectiveness of the identification and controller switching scheme.