Transformerless topologies for grid-connected single-phase photovoltaic inverters

NOTICE: this is the author’s version of a work that was accepted for publication in . Changes resulting from the publishing process, such as peer review, editing, corrections,structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in RENEWABLE AND SUSTAINABLE ENERGY REVIEWS, [VOL 15 , ISSUE 7, (07/2011)] DOI 10.1016/j.rser.2011.03.034[EN] In order to improve the efficiency and reduce the cost of a photovoltaic system, the use of transformerless photovoltaic inverters is an alternative of increasing interest. However, this topology needs to be studied in detail, as it presents some problems related to the galvanic connection between the grid and the photovoltaic generator (e.g. efficiency degradation and safety problems). In this paper, a review of grid-connected single-phase photovoltaic inverters based on transformerless topologies has been carried out. On the one hand, some alternatives based on classical topologies have been presented. On the other hand, alternatives based on multi-level inverter topologies have been studied, showing up that no leakage current is generated in comparison to classical topologies. © 2011 Elsevier Ltd All rights reserved.This work is supported by the Spanish Ministry of Science and Innovation under grant ENE2009-13998-C02-02.Patrao Herrero, I.; Figueres Amorós, E.; González Espín, FJ.; Garcerá Sanfeliú, G. (2011). Transformerless topologies for grid-connected single-phase photovoltaic inverters. Renewable and Sustainable Energy Reviews. 15(7):3423-3431. https://doi.org/10.1016/j.rser.2011.03.034S3423343115