In domestic grid connected PV applications a single phase converter is usually used. In such a low power plants it is possible to adopt converter topologies without galvanic isolation between the photovoltaic panels and the grid. The absence of a high or low frequency transformer permits to reduce power losses, cost and size of the converter. On the other side in presence of a galvanic connection a large ground leakage current could arise due to parasitic PV panel capacitance. Leakage currents cause electric safety problems, EMI increase and, consequently, a reduction of the converter power quality. This paper presents a converter topology able to minimize the ground leakage current also in case of unipolar PWM modulation without increasing inductive common mode filter size and preserving efficiency. Simulations and experimental results show the feasibility of the proposed solution.

A new proposal for ground leakage current reduction in transformerless grid-connected converters for photovoltaic plants / Barater, D.; Buticchi, G.; Crinto, A.; Franceschini, G.; Lorenzani, Emilio. - ELETTRONICO. - (2009), pp. 4531-4536. ((Intervento presentato al convegno IEEE IECON 2009 tenutosi a Porto, Portugal nel November 3-5 2009 [10.1109/IECON.2009.5414874].

A new proposal for ground leakage current reduction in transformerless grid-connected converters for photovoltaic plants

D. Barater;G. Franceschini;LORENZANI, EMILIO
2009-01-01

Abstract

In domestic grid connected PV applications a single phase converter is usually used. In such a low power plants it is possible to adopt converter topologies without galvanic isolation between the photovoltaic panels and the grid. The absence of a high or low frequency transformer permits to reduce power losses, cost and size of the converter. On the other side in presence of a galvanic connection a large ground leakage current could arise due to parasitic PV panel capacitance. Leakage currents cause electric safety problems, EMI increase and, consequently, a reduction of the converter power quality. This paper presents a converter topology able to minimize the ground leakage current also in case of unipolar PWM modulation without increasing inductive common mode filter size and preserving efficiency. Simulations and experimental results show the feasibility of the proposed solution.
2009
IEEE IECON 2009
Porto, Portugal
November 3-5 2009
4531
4536
Barater, D.; Buticchi, G.; Crinto, A.; Franceschini, G.; Lorenzani, Emilio
A new proposal for ground leakage current reduction in transformerless grid-connected converters for photovoltaic plants / Barater, D.; Buticchi, G.; Crinto, A.; Franceschini, G.; Lorenzani, Emilio. - ELETTRONICO. - (2009), pp. 4531-4536. ((Intervento presentato al convegno IEEE IECON 2009 tenutosi a Porto, Portugal nel November 3-5 2009 [10.1109/IECON.2009.5414874].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/650640
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