This paper presents a single-phase transformerless grid-connected photovoltaic converter based on two cascaded full-bridges with different DC-link voltages. The converter can synthesize up to nine voltage levels and needs only a single DC supply bus, since one of the full bridges is supplied by a flying capacitor. The multilevel output reduces harmonic distortion and electromagnetic interference. A suitable switching strategy is employed to regulate the flying capacitor voltage, improve the efficiency (most devices switch at grid frequency) and minimize the common-mode leakage current with the help of a novel dedicated circuit (transient circuit). Simulations and experiments confirm the feasibility and good performance of the proposed converter.

A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems / Buticchi, Giampaolo; Barater, Davide; E., Lorenzani; Concari, Carlo; Franceschini, Giovanni. - In: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS. - ISSN 0278-0046. - 61:8(2014), pp. 3951-3960. [10.1109/TIE.2013.2286562]

A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems

BUTICCHI, Giampaolo;BARATER, Davide;CONCARI, Carlo;FRANCESCHINI, Giovanni
2014-01-01

Abstract

This paper presents a single-phase transformerless grid-connected photovoltaic converter based on two cascaded full-bridges with different DC-link voltages. The converter can synthesize up to nine voltage levels and needs only a single DC supply bus, since one of the full bridges is supplied by a flying capacitor. The multilevel output reduces harmonic distortion and electromagnetic interference. A suitable switching strategy is employed to regulate the flying capacitor voltage, improve the efficiency (most devices switch at grid frequency) and minimize the common-mode leakage current with the help of a novel dedicated circuit (transient circuit). Simulations and experiments confirm the feasibility and good performance of the proposed converter.
2014
A Nine-Level Grid-Connected Converter Topology for Single-Phase Transformerless PV Systems / Buticchi, Giampaolo; Barater, Davide; E., Lorenzani; Concari, Carlo; Franceschini, Giovanni. - In: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS. - ISSN 0278-0046. - 61:8(2014), pp. 3951-3960. [10.1109/TIE.2013.2286562]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2649669
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