Transformer-Less Single-Phase Four-Level Inverter for PV System Applications

Saeed Yousofi-Darmian; Seyed Masoud Barakati

Transformer-Less Single-Phase Four-Level Inverter for PV System Applications

Saeed Yousofi-Darmian

Seyed Masoud Barakati

Vol. 14, No. 6, pp. 1233-1242, Nov. 2014

10.6113/JPE.2014.14.6.1233

Four-level inverter

Leakage ground current

Photovoltaic System

Single-phase

Transformer-less

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Abstract

A new inverter topology for single-phase photovoltaic (PV) systems is proposed in this study. The proposed inverter offers afour-level voltage in its output terminals. This feature results in easier filtering in comparison with other conventional two-levelor three-level inverters. In addition, the proposed four-level inverter (PFLI) has a transformer-less topology, which decreases thesize, weight, and cost of the entire system and increases the overall efficiency of the system. Although the inverter istransformer-less, it produces a negligible leakage ground current (LGC), which makes this inverter suitable for PVgrid-connected applications. The performance of the proposed inverter is compared with that of a four-level neutral pointclamped inverter (FLNPCI). Theoretical analysis and computer simulations verify that the PFLI topology is superior to FLNPCIin terms of efficiency and suitability for use in PV transformer-less systems.

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Cite this article

[IEEE Style]

S. Yousofi-Darmian and S. M. Barakati, "Transformer-Less Single-Phase Four-Level Inverter for PV System Applications," Journal of Power Electronics, vol. 14, no. 6, pp. 1233-1242, 2014. DOI: 10.6113/JPE.2014.14.6.1233.

[ACM Style]

Saeed Yousofi-Darmian and Seyed Masoud Barakati. 2014. Transformer-Less Single-Phase Four-Level Inverter for PV System Applications. Journal of Power Electronics, 14, 6, (2014), 1233-1242. DOI: 10.6113/JPE.2014.14.6.1233.