Analysis and Modeling of Single-stage Resonant Dual Active Bridge Converter for Microinverters

In order to simplify the microinverter topology, a single-stage resonant dual active bridge converter is proposed in this paper. The paper introduces the basic working principle of the proposed converter, analyzes its power control characteristics, and proposes a time-domain modeling based on the three-level equivalence according to the three-level square wave characteristics of the primary side of the Dual Active Bridge circuit and the symmetrical operation mode, which solves the problem of the leakage inductance current that cannot be solved due to the LC resonance. Finally, the proposed modeling approach is effectively verified by experiments.