Microinverter with reduced number of semiconductor switches

This paper proposes the use of a topology of a positive-input boost converter and symmetrical positive and negative outputs for the DC-DC stage of a microinverter connected to the electrical network with a small number of semiconductor switches. To validate and prove the operation of the system, simulations were performed in the PSIM software. All controllers and frequency-locked-loop (FLL) are exposed in the discrete form to facilitate implementation in a digital signal processor. For the reliability and adherence of the simulations with real cases, real data of solar irradiance and temperature of panels were experimentally collected and used.