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Novel PV fed three phase single power stage system for stand-alone applications

Renewable energy sources like solar PV are desirable to meet the increasing power demand. This paper proposes a novel single power stage, PV system designed for 3-φ stand-alone applications. The single stage topology has the advantage of being simple and more efficient. The developed topology is basically a current source inverter with a single power conversion stage that directly feeds the stand-alone AC load. The inductor diode network allows the inverter to operate in buck-boost manner. This converter is especially suitable for sources such as PV and fuel cells with low voltage. A modified 120° conduction mode operation of the inverter is implemented. Maximum power point tracking algorithm based on P&O method is also implemented. Circuit analysis and simulations of the proposed system are included.