• MIHĂIȚĂ-ALEXANDRU ILIE Electrical Engineering Faculty, University Politehnica of Bucharest, Bucharest, Romania
  • DAN FLORICĂU Electrical Engineering Faculty, University Politehnica of Bucharest, Bucharest, Romania


Grid-connected, Photovoltaic system, Three-level active neutral point clamped, Optimal control, Three-level dc-dc boost converter


In this paper, a comparison between three double-stage grid-connection systems in central inverter configuration is presented. This configuration can be used to obtain a wide power range and is suitable for the connection to three-phase grids. In this case, the photovoltaic (PV) panels are connected to the inverter via a dc-dc converter to ensure an optimal dc voltage level. The focus is on the characteristics and properties of the used converter’s structures. All the design steps of a grid connection system are also presented. Both two-level (2L) and three-level (3L) voltage structures are implemented. At the end of the paper, a detailed analysis highlights the advantages and disadvantages of the three photovoltaic systems connected to the grid.


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Électrotechnique et électroénergétique | Electrical and Power Engineering