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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Hossein Khoun Jahan & Naser Vosoughi Kurdkandi & Mehdi Abapour & Kazem Zare & Seyed Hossein Hosseini & Yongheng Yang & Frede Blaabjerg, 2020. "Common-Ground-Type Single-Source High Step-Up Cascaded Multilevel Inverter for Transformerless PV Applications," Mathematics, MDPI, vol. 8(10), pages 1-17, October.
    • Handle: RePEc:gam:jmathe:v:8:y:2020:i:10:p:1716-:d:424430
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