Push-pull based single stage PV microinverter for grid-tied modules

Microinverters, when compared to other power conversion systems for PV applications, show several advantages in terms of total energy harvested, lifetime and reliability. For this reason much interest has been raised on this topic in recent years. Commonly microinverters are implemented by using a flyback derived converter, which has several disadvantages in terms of high electromagnetic (EM) noise, high voltage stress on semiconductors, and oftentimes the requirement of more than one converter to achieve an AC output. To cope with these issues, a microinverter topology based on a push-pull converter integrated with a voltage unfolder is presented in this paper. The proposed converter results in single stage power conversion with reduced passive components, low voltage stress and reduced EM noise. The proposed system is validated through simulations on PSIM.