Fast-Simulation Methods for LCC-S Wireless Power Transfer Systems in Electric Vehicles
Juan M. Perié, José F. Sanz, O. García-Izquierdo, Marta Calavia, Julio J. Melero, M. Paz Comech Instituto de Investigación Mixto de la Energía y la Eficiencia de los Recursos de Aragón, ENERGAIA, Universidad de Zaragoza-Fundación CIRCE, Zaragoza, Spain 2026-06-27

Abstract

The fast and iterative simulation of a large number of resonant power‑electronics circuit cases is essential for optimizing control variables or for the optimal sizing of passive components in Wireless Power Transfer Systems. Commonly used approximations, such as the first‑harmonic approximation, are useful for estimating certain electrical quantities, such as RMS current, phase or power, but they incur in significant errors in quantities that are more sensitive to distortion, such as switching current or peak values.

To achieve a suitable compromise between the simulation time required to analyse as many cases as possible and the accuracy of the resulting values, this work investigates the performance of three simulation methods: transient simulation, the first‑harmonic approximation, and the Fourier‑based approximation. In addition, the influence of simulation parameters, such as the transient simulation time or the number of harmonics considered, will be evaluated both in terms of computational cost and in the quality of the obtained results.

Key words: Resonant converters, wireless power transfer systems, EV wireless charging, steady-state simulation, multi-variable controllers.

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