Parameter Identification Method With Dynamic Impedance Modulation for the DWPT System

A novel parameter identification method with dynamic impedance regulation is proposed to maintain constant output voltage of dynamic wireless power transfer (DWPT) system under varied loads and mutual inductance conditions. The resonant capacitor in the receiver side is replaced with a switched-controlled capacitor (SCC) structure, which enables the system to work under two operation modes. And then a comprehensive mathematical model is established according to these two modes to achieve the parameter identification. To avoid the deterioration of identification accuracy caused by the capacitors’ parameter drift, a dynamic impedance regulation method is introduced. The SCC is under dynamic closed-loop modulation to realize precious control of the equivalent capacitance of resonant capacitor in the receiver side. An experimental prototype is built in the laboratory, and the experimental results clearly demonstrate the accuracy of the proposed parameter identification.