Researched on a Novel PV Power Inverter Applied in Micro-Grid

A novel PV power inverter applied in micro-grid is developed in this paper. It runs not only in connected-grid but also in disconnected-grid and keeps voltage stable rapidly in transient process. When the inverter is connected with the grid, the inverter produces power as a current-source with voltage-current close loop control strategy. Once the islanding event takes place, it runs as a voltage-source, adopting voltage virtual value outer-loop and voltage instantaneous value inner-loop control strategy and fuzzy self-adjusting for PI parameters. Finally the experimental results demonstrate the effectiveness with PV experimental platform.