Modeling of a three-phase inductive power transfer system in phasor domain for fast simulation

Contactless charging of electric vehicles by means of inductive power transfer is becoming increasingly popular in the recent years. In contrast to wired power interfaces, user-friendly and secure wireless links with no physical contact are preferable. Especially in the higher power range (>100kW), three-phase approaches are an encouraging alternative to single-phase systems due to great EMC benefits. Effective design and analysis of such inductive power transfer systems containing a three-phase primary as well as a three-phase secondary (pickup) require computation-time provident mathematical models. This paper introduces a mathematical model of a complete three-phase inductive power transfer system as a base for efficient computer simulation of such a system. Based on a time-domain description, an averaged model of the system is developed using the dynamic phasors approach. Simulation results under exemplary conditions are presented to show the performance of the developed model.