TRANSFORMERLESS PHOTOVOLTAIC INVERTER

• Transformer less inverter is 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. 

Solar inverter

• 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 paper presents a novel topology in order to reduce this ground leakage current. It is established that the neutral line in the grid is the same as that of the negative terminal in a PV system, eliminating this way, any possibility of leakage current in this terminal. 

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