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An Asymmetrical Step-Up Multilevel Inverter Based on Switched-Capacitor Network

Author

Listed:
  • Amir Taghvaie

    (School of Engineering, Deakin University, Geelong, VIC 3216, Australia)

  • Ahmad Alijani

    (Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Mazandaran 47148-71167, Iran)

  • M. Ebrahim Adabi

    (Intelligent Electrical Power Grids at Department of Electrical Sustainable Energy, Delft University of Technology, 5031, 2600 GA Delft, The Netherlands)

  • Mohammad Rezanejad

    (Faculty of Engineering and Technology, University of Mazandaran, Babolsar 47416-13534, Iran)

  • Jafar Adabi

    (Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Mazandaran 47148-71167, Iran)

  • Kumars Rouzbehi

    (Department of System Engineering and Automatic Control, University of Seville, 41004 Seville, Spain)

  • Edris Pouresmaeil

    (Department of Electrical Engineering and Automation, Aalto University, Maarintie 8, 02150 Espoo, Finland)

Abstract

This paper presents a transformerless step-up multilevel inverter based on a switched-capacitor structure. One of the main contributions of the proposed topology is replacing the separated DC voltage source with capacitors which are charged at predetermined time intervals. Therefore, a high-level staircase voltage waveform can be achieved by discharging some of these capacitors on the load. The other contribution of the proposed structure is to eliminate the magnetic elements which traditionally boost the input DC voltage. In addition, asymmetrical or unequal amounts of capacitor voltages create more voltage levels, which enable voltage level increments without increasing the number of semiconductor devices. This paper introduces a self-balanced boost Switched-Capacitors Multilevel Inverter (SCMLI) which is able to create a nearly sinusoidal voltage waveform with a maximum voltage of up to 45 times that of the input voltage DC source. Higher level output voltage levels are also achievable by extending the circuit topology. After determination of the switching angles and selecting the proper switching states for each level, an offline NLC method is used for modulation, which eases the control implementation. Analysis, simulation and experiments are carried out for a 91-level inverter (45 levels for positive and negative voltages and one for zero voltage) are presented.

Suggested Citation

  • Amir Taghvaie & Ahmad Alijani & M. Ebrahim Adabi & Mohammad Rezanejad & Jafar Adabi & Kumars Rouzbehi & Edris Pouresmaeil, 2019. "An Asymmetrical Step-Up Multilevel Inverter Based on Switched-Capacitor Network," Sustainability, MDPI, vol. 11(12), pages 1-18, June.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:12:p:3453-:d:242323
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    Cited by:

    1. Ibrahim Harbi & Mohamed Abdelrahem & Mostafa Ahmed & Ralph Kennel, 2020. "Reduced-Complexity Model Predictive Control with Online Parameter Assessment for a Grid-Connected Single-Phase Multilevel Inverter," Sustainability, MDPI, vol. 12(19), pages 1-23, September.

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