ABCD Parameters in Series-Series Compensation Wireless Power Transfer System

Wireless power transfer (WPT) systems are commonly used in electric vehicles and various mobile applications. In order to transmit power wirelessly in a weak magnetic coupling between transmitting and receiving ends, it is required to compensate for the leakage inductance by the capacitors and conFigure an electrical resonance circuit. This study analyses a series-series (SS) capacitor compensation application in various compensating topologies. This paper introduces ABCD parameters in the SS WPT system based on the middle-length transmission line analysis in power system engineering. The SS WPT system can be represented as T-shape lumped model, and the ABCD parameters can be obtained by analysing the correlation of sending and receiving voltage and current. With the found parameters, the voltage and current between the ends can be estimated accurately for the design of the SS WPT system like traditional power transmission lines. Also, this paper verifies the effectiveness of the proposed ABCD parameters in the SS WPT application through the electromagnetic field solver simulation.