PROJECT TITLE :

Grid-Connected Forward Microinverter With Primary-Parallel Secondary-Series Transformer

ABSTRACT:

This paper presents a primary-parallel secondary-series multicore forward microinverter for photovoltaic ac-module application. The presented microinverter operates with a continuing off-time boundary mode control, providing MPPT capability and unity power factor. The proposed multitransformer resolution allows using low-profile unitary turns ratio transformers. Therefore, the transformers are better coupled and the general performance of the microinverter is improved. Thanks to the multiphase answer, the amount of devices will increase however this stress and losses per device are reduced contributing to a better thermal management. Furthermore, the decoupling capacitor is split among the phases, contributing to a coffee-profile resolution without electrolytic capacitors suitable to be mounted in the frame of a PV module. The proposed answer is compared to the classical parallel-interleaved approach, showing better efficiency in a very wide power range and improving the weighted potency.