Transient Analysis of Dual LCC Compensated IPT System by Dynamic Gyrator

Abstract

This thesis addresses the concept of dynamic gyrator model used for a dual LCC compensated IPT system to anlyze the transient state. The core idea is to apply the well-known dynamic phasor framework to the IPTS which introduces the dynamic gyrator in the phasor domain. In contrast to the conventional static gyrator, which is only valid for the steady state conditions, the dynamic gyrator model is applicable to both steady state and transient state. Apart from the transient analysis, the other significant impact of this research is the circuit order reduction. The original dual LCC compensated IPT system consisting of four resonant LC tanks and corresponding to an eight-order circuit, is reduced to a fourth order system under resonant conditions. This order reduction significantly simplies the dynamic analysis and control design and eliminates the necessity of the complicated high order formulations required in conventional IPT modelling and design methods. The proposed model is validated through extensive simulations and experimentsal measurements on a 260 W dual LCC compensated IPT prototype tuned at 60 kHz. The results confirm that the dynamic gyrator model can reliably predict dynamic behavior under resonant frequency and steady state characteristics under a wide frequency range. A preliminary extension of the model to non resonant transient operation is also introduced, however, its accuracy has not been fully verified and is therefore identified as an important direction for future reseach.