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Eliminating ground current in a transformerless photovoltaic application / Lopez, O. in IEEE transactions on energy conversion, Vol. 25 N° 1 (Mars 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25 N° 1 (Mars 2010) . - pp. 140 - 147 Titre : Eliminating ground current in a transformerless photovoltaic application Type de document : texte imprimé Auteurs : Lopez, O., Auteur ; Freijedo, F.D., Auteur ; Yepes, A.G., Auteur Année de publication : 2010 Article en page(s) : pp. 140 - 147 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : harmonics;  photovoltaic  power  systems;  power  system  simulation Résumé : For low-power grid-connected applications, a single-phase converter can be used. In photovoltaic (PV) applications, it is possible to remove the transformer in the inverter to reduce losses, costs, and size. Galvanic connection of the grid and the dc sources in transformerless systems can introduce additional ground currents due to the ground parasitic capacitance. These currents increase conducted and radiated electromagnetic emissions, harmonics injected in the utility grid, and losses. Amplitude and spectrum of the ground current depend on the converter topology, the switching strategy, and the resonant circuit formed by the ground capacitance, the converter, the ac filter, and the grid. In this paper, the ground current in a 1.5-kW PV installation is measured under different conditions and used to build a simulation model. The installation includes a string of 16 PV panel, a full-bridge inverter, and an LCL filter. This model allows the study of the influence of the harmonics injected by the inverter on the ground current. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5401088&sortType%3Das [...] [article] Eliminating ground current in a transformerless photovoltaic application [texte imprimé] / Lopez, O., Auteur ; Freijedo, F.D., Auteur ; Yepes, A.G., Auteur . - 2010 . - pp. 140 - 147. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25 N° 1 (Mars 2010) . - pp. 140 - 147 Mots-clés : harmonics;  photovoltaic  power  systems;  power  system  simulation Résumé : For low-power grid-connected applications, a single-phase converter can be used. In photovoltaic (PV) applications, it is possible to remove the transformer in the inverter to reduce losses, costs, and size. Galvanic connection of the grid and the dc sources in transformerless systems can introduce additional ground currents due to the ground parasitic capacitance. These currents increase conducted and radiated electromagnetic emissions, harmonics injected in the utility grid, and losses. Amplitude and spectrum of the ground current depend on the converter topology, the switching strategy, and the resonant circuit formed by the ground capacitance, the converter, the ac filter, and the grid. In this paper, the ground current in a 1.5-kW PV installation is measured under different conditions and used to build a simulation model. The installation includes a string of 16 PV panel, a full-bridge inverter, and an LCL filter. This model allows the study of the influence of the harmonics injected by the inverter on the ground current. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5401088&sortType%3Das [...]