Dynamic Reduced-Order Modeling of Wireless Power Transfer Systems Via Polynomial Approximation

This letter presents a novel method to build dynamic, control to output models for series–series compensated wireless power transfer (WPT) systems under phase or variable frequency control. In order to yield models that are as simple as necessary to explain the dominant behavior of the system, as always required in scenarios, such as control system design, a polynomial approximation technique is proposed for model order reduction. The merit of the proposed method lies in that the model order can be easily reduced to 1, 3, or 5; and models of different order can be handled in an equally simple manner. Experimental results confirm that the dynamic behavior of the system can be well modeled, even by a simple first-order model.