Frequency Domain Analysis of a Dynamic Wireless Transfer System for Electric Vehicles

Dynamic Wireless Power Transfer (DWPT) is a revolutionary technology for developing an autonomic electromobility transport system. A robust control method is essential for maximum power transfer with high efficiencies and the safe operation of the DWPT systems. This paper developed a frequency domain model of a series-series wireless power transfer system to thoroughly analyze how different control parameters affect the system performances under dynamic situations. For the first time, the power triangle phenomenon associated with the proposed optimum frequencies of a DWPT system is discovered to reveal the causal relationship between frequency, phase shift, and power. The theoretical performances of the proposed optimum frequencies are well aligned with the results of simulation and experiments, with 83% of the normalized root mean square errors less than 2%.