Parameter Identification Method for Multifrequency and Multiload MCR-WPT System Based on Hysteresis Current Control

Abstract

Because the multifrequency and multiload (MFML) magnetic coupling wireless power transfer (MCR-WPT) system has many varied parameters, which brings great challenges to the system modeling and control, it is important to realize the identification of system parameters. Aiming at the problems that the existing parameter identification technologies have few identification parameters and large calculation amount, this article proposes a parameter identification method for MFML MCR-WPT system based on hysteresis current (HC) control. By analyzing the impedance characteristics at different frequency, the equation set are established. Without changing the system state and additional structure, the mutual inductances and loads can be identified with lower computation complexity. First, the working mechanism and multiparameter identification principle of MFML MCR-WPT system based on HC control are introduced. Second, the system model is established at different frequency, and the frequency expansibility of proposed technology is demonstrated. Third, the equation set are established and simplified based on system impedance characteristic at different frequency. Then, the result and sensitivity of identification method is discussed. Finally, an experimental platform is set up, and the experimental results show that the proposed method can achieve at least 90% identification accuracy.