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

Jorge Cardoso, Nimrod Vazquez, Claudia Hernandez and Joaquin Vaquero
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Jorge Cardoso: Department of Electronics Engineering, National Technological of Mexico-Technological Institute of Celaya, Celaya 38010, Mexico
Nimrod Vazquez: Department of Electronics Engineering, National Technological of Mexico-Technological Institute of Celaya, Celaya 38010, Mexico
Claudia Hernandez: Department of Electronics Engineering, National Technological of Mexico-Technological Institute of Celaya, Celaya 38010, Mexico
Joaquin Vaquero: Electronic Technology Department, King Juan Carlos University, 28933 Mostoles, Madrid, Spain

Energies, 2018, vol. 11, issue 8, 1-21

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.

Keywords: transformerless inverter; leakage current; current source inverter; renewable sources; grid-tied photovoltaic systems (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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