A NOVEL DESIGN, ANALYSIS AND SUPPRESSION OF LEAKAGE CURRENT IN TRANSFORMERLESS PHOTOVOLTAIC INVERTER
Publication Date : 27/03/2019
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Transformerless inverters are being widely used in grid-connected photovoltaic (PV) generation systems. Transformer elimination, in grid-connected PV systems, has many advantages. This not only reduces cost, size, and weight, but also increases the whole system efficiency. However, once the transformer is removed, there is no galvanic isolation between grid and PV array; as a consequence, leakage current appears due to parasitic capacitance to the ground, resulting in prohibitive electromagnetic interference and security issues. This research work presents a novel topology in order to reduce this ground leakage current by improving isolation between primary & secondary. The proposed system will increase the system efficiency by reducing dc component and leakage current. The main features of this proposed topology are in the first place, the negative of the PV array is connected directly to the neutral of the grid greatly reducing the ground leakage current through the parasitic capacitance; and in second place, the topology only uses two MOSFETs reducing cost of the whole system.
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