A Bi-directional Flyback Micro-inverter for Power Flow Control of a Grid-connected Solar PV Module

This paper discusses the development of a bi-directional flyback micro-inverter for grid-connected solar photovoltaic module power control. This micro-inverter uses a transformer with a primary winding that is double wound. Each winding conducts current from a solar PV module via two alternately operating power switches. The power angle control is used to regulate the flow of energy from solar PV to the grid. Matlab software is used to implement and test the control circuit design. Several experiments were conducted by varying the power angle value and analyzing the active power, reactive power, and power factor. The experimental results indicate that changing the power angle significantly affects the active power injection. It has no noticeable impact on reactive power flow, though. The power factor profile tends to stay very much the same. However, increasing the value of the power angle by more than 90 degrees causes the power injection to become unstable.