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Seven-Level Inverter with Reduced Switches for PV System Supporting Home-Grid and EV Charger

Author

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  • Ahmed Ismail M. Ali

    (Department of Electrical Power and Machines Engineering, Faculty of Engineering, South Valley University, Qena 83523, Egypt)

  • Mahmoud A. Sayed

    (Department of Electrical Power and Machines Engineering, Faculty of Engineering, South Valley University, Qena 83523, Egypt)

  • Ahmed A. S. Mohamed

    (Center for Integrated Mobility Sciences, National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA)

Abstract

This paper proposes a simple single-phase new pulse-width modulated seven-level inverter architecture for photovoltaic (PV) systems supporting home-grid with electric vehicle (EV) charging port. The proposed inverter includes a reduced number of power components and passive elements size, while showing less output-voltage total harmonic distortion (THD), and unity power factor operation. In addition, the proposed inverter requires simple control and switching strategies compared to recently published topologies. A comparative study was performed to compare the proposed inverter structure with the recent inverter topologies based on the number of components in the inverter circuit, number of components per output-voltage level, average number of active switches, THD, and operating efficiency as effective parameters for inverter performance evaluation. For design and validation purposes, numerical and analytical models for a grid-tied solar PV system driven by the proposed seven-level inverter were developed in MATLAB/Simulink environment. The inverter performance was evaluated considering grid-integration and stand-alone home with level-2 AC EV charger (3–6 kW). Compared with recently published topologies, the proposed inverter utilizes a reduced number of power components (7 switches) for seven-level terminal voltage synthesis. An experimental prototype for proposed inverter with the associated controller was built and tested for a stand-alone and grid-integrated system. Due to the lower number of ON-switches, the inverter operating efficiency was enhanced to 92.86% with load current THD of 3.43% that follows the IEEE standards for DER applications.

Suggested Citation

  • Ahmed Ismail M. Ali & Mahmoud A. Sayed & Ahmed A. S. Mohamed, 2021. "Seven-Level Inverter with Reduced Switches for PV System Supporting Home-Grid and EV Charger," Energies, MDPI, vol. 14(9), pages 1-23, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2718-:d:551390
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    References listed on IDEAS

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    Cited by:

    1. Ahmed Ismail M. Ali & Takaharu Takeshita & Mahmoud A. Sayed, 2021. "Three-Phase PWM Inverter for Isolated Grid-Connected Renewable Energy Applications," Energies, MDPI, vol. 14(12), pages 1-16, June.

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