Control-oriented modeling of wireless power transfer systems with phase-shift control
Résumé
This paper investigates control-oriented modeling of a class of wireless power transfer systems with a phase-shift controlled inverter. Two methods are studied: the conventional analytical modeling method which is based on physical laws, and the refined instrumental variable method which is based on sampled data. It shows that the former provides good physical insights into the system, and that the resulting models are accurate when the true circuit component parameters are known. However, poor results may be obtained if this condition is not satisfied. By contrast, the later provides a cheap solution for accurate modeling, which requires a set of sampled input-output data only and the resulting model can capture very well the dynamic behavior of the system within its operating range. To have virtues of both methods, it is therefore suggested to use them as a combination, that is, using the analytical method to determine the model order while using the data-driven method to estimate the model parameters. All results derived in this paper are verified by means of both numerical simulation and experimental validation.