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A new common mode transformer less photovoltaic inverter
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A new common-mode transformer less photovoltaic inverter

Category : Power Electronics


Sub Category : DC TO AC CONVERTERS (INVERTERS)


Project Code : ITPW18


Project Abstract

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. 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. A sliding mode controller that controls the output current has been employed. The principle of operation of the transformerless inverter is analyzed, but also the topology has been simulated and experimentally tested.

EXISTING SYSTEM

 

PROPOSED SYSTEM

                                   

 

Here the leakage current is high in the neutral

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

The multilevel Neutral Point Clamped (NPC) inverter.

 

Common Mode Inverter proposed

More than two switches are used

Only two switches are used.

 

less efficiency

 

high efficiency

 
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