Grid connected PV system using two energy processing stages

In this work a simple and robust system to be used with electrical energy generated by photovoltaic modules is proposed. Through this system, the produced energy is directly injected into the electric grid utility. It does not need batteries since it operates connected to the grid. The energy supply occurs in periods where the sunlight is present, with the system in standby when light is not supplied. The adopted control strategy allowed the production of a current with little harmonic distortion, simplifying and reducing the size and the number of components, both in the control as well as in the output filter. The high frequency operation permitted the size reduction of the magnetic components and the capacitors. The system is composed by two stages: a flyback converter and a full-bridge voltage inverter. This system operates with commercially available modules being necessary no adaptation of these to be connected. Design procedure and experimental results are shown.