Efficient Single Phase Transformerless Inverter forGrid-Tied PVG System With Reactive Power Control - 2016


There has been an increasing interest in transformerless inverter for grid-tied photovoltaic (PV) system due to low value, high efficiency, light weight, etc. So, many transformerless topologies have been proposed and verified with real power injection only. Recently, nearly every international regulation has imposed that a definite quantity of reactive power should be handled by the grid-tied PV inverter. According to the standard VDE-AR-N 4105, grid-tied PV inverter of power rating below 3.68KVA, should attain power factor (PF) from zero.ninety five leading to zero.95 lagging. During this paper, a replacement high potency transformerless topology is proposed for grid-tied PV system with reactive power management. The new topology structure and detail operation principle with reactive power flow is described. The high frequency common-mode (CM) model and therefore the management of the proposed topology are analyzed. The inherent circuit structure of the proposed topology does not lead itself to the reverse recovery issues even when inject reactive power that enable utilizing MOSFET switches to boost the overall potency. The CM voltage is kept constant at mid-point of dc input voltage, results low leakage current. Finally, to validate the proposed topology, a one kW laboratory prototype is made and tested. The experimental results show that the proposed topology can inject reactive power into the utility grid without any extra current distortion and leakage current. The maximum efficiency and European potency of the proposed topology are measured and located to be 98.fifty fourpercent and ninety eight.29%, respectively.

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