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

Ahmed Ismail M. Ali, Mahmoud A. Sayed and Ahmed A. S. Mohamed
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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

Energies, 2021, vol. 14, issue 9, 1-23

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.

Keywords: DC-AC converter; electric vehicles; home grid; maximum power point tracking (MPPT); multilevel inverter; photovoltaic (PV) system; seven-level inverter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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