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Energies 2018, 11(8), 2011; https://doi.org/10.3390/en11082011

A Transformerless Single-Phase Current Source Inverter Topology and Control for Photovoltaic Applications

1
Department of Electronics Engineering, National Technological of Mexico-Technological Institute of Celaya, Celaya 38010, Mexico
2
Electronic Technology Department, King Juan Carlos University, 28933 Mostoles, Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 31 May 2018 / Revised: 26 July 2018 / Accepted: 31 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Advanced Control Techniques for Power Converters)
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Abstract

Low power grid-tied photovoltaic (PV) generation systems increasingly use transformerless inverters. The elimination of the transformer allows smaller, lighter and cheaper systems, and improves the total efficiency. However, a leakage current may appear, flowing from the grid to the PV panels through the existing parasitic capacitance between them, since there is no galvanic isolation. As a result, electromagnetic interferences and security issues arise. This paper presents a novel transformerless single-phase Current Source Inverter (CSI) topology with a reduced inductor, compared to conventional CSIs. This topology directly connects the neutral line of the grid to the negative terminal of the PV system, referred as common mode configuration, eliminating this way, theoretically, the possibility of any leakage current through this terminal. The switches control is based on a hysteresis current controller together with a combinational logic circuitry and it is implemented in a digital platform based on National Instruments Technology. Results that validate the proposal, based on both simulations and tests of a low voltage low power prototype, are presented. View Full-Text
Keywords: transformerless inverter; leakage current; current source inverter; renewable sources; grid-tied photovoltaic systems transformerless inverter; leakage current; current source inverter; renewable sources; grid-tied photovoltaic systems
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cardoso, J.; Vazquez, N.; Hernandez, C.; Vaquero, J. A Transformerless Single-Phase Current Source Inverter Topology and Control for Photovoltaic Applications. Energies 2018, 11, 2011.

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