Common-Ground-Type Single-Source High Step-Up Cascaded Multilevel Inverter for Transformerless PV Applications

Hossein Khoun Jahan, Naser Vosoughi Kurdkandi, Mehdi Abapour, Kazem Zare, Seyed Hossein Hosseini, Yongheng Yang and Frede Blaabjerg
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Hossein Khoun Jahan: Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51368, Iran
Naser Vosoughi Kurdkandi: Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51368, Iran
Mehdi Abapour: Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51368, Iran
Kazem Zare: Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51368, Iran
Seyed Hossein Hosseini: Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz 51368, Iran
Yongheng Yang: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
Frede Blaabjerg: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark

Mathematics, 2020, vol. 8, issue 10, 1-17

Abstract: The cascaded multilevel inverter (CMI) is one type of common inverter in industrial applications. This type of inverter can be synthesized either as a symmetric configuration with several identical H-bridge (HB) cells or as an asymmetric configuration with non-identical HB cells. In photovoltaic (PV) applications with the CMI, the PV modules can be used to replace the isolated dc sources; however, this brings inter-module leakage currents. To tackle the issue, the single-source CMI is preferred. Furthermore, in a grid-tied PV system, the main constraint is the capacitive leakage current. This problem can be addressed by providing a common ground, which is shared by PV modules and the ac grid. This paper thus proposes a topology that fulfills the mentioned requirements and thus, CMI is a promising inverter with wide-ranging industrial uses, such as PV applications. The proposed CMI topology also features high boosting capability, fault current limiting, and a transformerless configuration. To demonstrate the capabilities of this CMI, simulations and experimental results are provided.

Keywords: cascaded multilevel inverter; photovoltaic; leakage current (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2020
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