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AC Current Ripple in Three-Phase Four-Leg PWM Converters with Neutral Line Inductor

Author

Listed:
  • Aleksandr Viatkin

    (Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy)

  • Riccardo Mandrioli

    (Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy)

  • Manel Hammami

    (Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy)

  • Mattia Ricco

    (Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy)

  • Gabriele Grandi

    (Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy)

Abstract

This paper presents a comprehensive study of peak-to-peak and root-mean-square (RMS) values of AC current ripples with balanced and unbalanced fundamental currents in a generic case of three-phase four-leg converters with uncoupled AC interface inductors present in all three phases and in neutral. The AC current ripple characteristics were determined for both phase and neutral currents, considering the sinusoidal pulse-width modulation (SPWM) method. The derived expressions are simple, effective, and ready for accurate AC current ripple calculations in three- or four-leg converters. This is particularly handy in the converter design process, since there is no need for heavy numerical simulations to determine an optimal set of design parameters, such as switching frequency and line inductances, based on the grid code or load restrictions in terms of AC current ripple. Particular attention has been paid to the performance comparison between the conventional three-phase three-leg converter and its four-leg counterpart, with distinct line inductance values in the neutral wire. In addition to that, a design example was performed to demonstrate the power of the derived equations. Numerical simulations and extensive experimental tests were thoroughly verified the analytical developments.

Suggested Citation

  • Aleksandr Viatkin & Riccardo Mandrioli & Manel Hammami & Mattia Ricco & Gabriele Grandi, 2021. "AC Current Ripple in Three-Phase Four-Leg PWM Converters with Neutral Line Inductor," Energies, MDPI, vol. 14(5), pages 1-31, March.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:5:p:1430-:d:511345
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    References listed on IDEAS

    as
    1. Riccardo Mandrioli & Aleksandr Viatkin & Manel Hammami & Mattia Ricco & Gabriele Grandi, 2020. "A Comprehensive AC Current Ripple Analysis and Performance Enhancement via Discontinuous PWM in Three-Phase Four-Leg Grid-Connected Inverters," Energies, MDPI, vol. 13(17), pages 1-32, August.
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    Cited by:

    1. Riccardo Mandrioli & Francesco Lo Franco & Mattia Ricco & Gabriele Grandi, 2023. "A Generalized Approach for Determining the Current Ripple RMS in Four-Leg Inverters with the Neutral Inductor," Energies, MDPI, vol. 16(4), pages 1-19, February.

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