Modeling and control of a wide-input hybrid resonant microconverter for photovoltaic applications

In modular photovoltaic conditioning system (PCS), microinverter is the important device to convert solar energy to grid electricity. A hybrid resonant microconverter served as front-end converter in a two-stage microinverter with two different modes was proposed previously [1]. The topology with two operating modes can achieve wide-input regulation and maintain high-efficiency over a wide input range. This paper derives the linearized models and control-to-input transfer functions of two operating modes for this high-efficiency hybrid resonant microconverter. Voltage controllers and a smooth transition are designed based on proposed models. The derived linearized models matched well with simulations. Experimental results with a 300 W prototype verify the performance of voltage controllers and transition.