A Transformer-less Inverter with Reduced Common Mode Leakage Current for Pv Applications
نویسنده
چکیده
The DC/AC inverters are used in grid-coupled Photovoltaic (PV) energy fabrication systems as the power meting out interface between the PV power source and the electric grid. Compared to the grid-coupled PV inverters that have galvanic separation (either on the DC, or on the AC side),the transformer-less PV inverters have the advantages of lower cost, higher efficiency, smaller size and lower weight. In the transformer-less topology, the common-mode (CM) ground leakage current may emerge on the parasitic capacitor between the PV panels and the ground. The transformer-less inverter is anticipated with virtual DC bus to condense the leakage current and electromagnetic losses. The PIC microcontroller generates all control signals which regulates the output voltage of DC/AC inverter .Closed loop MPPT control is also provided to achieve the desired output voltage. Keywords— Common mode(CM) current, Transformer less-Inverter, Unipolar SPWM Technique, Virtual DC Bus.
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