Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 62, Issue 10, Pages 6381-6391Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2015.2426146
Keywords
Common mode (CM); leakage current; photovoltaic (PV) systems; sliding-mode control (SMC); transformerless inverter
Categories
Funding
- General Direction of Technological Superior Education (DGEST)
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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 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.
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