A Generalized Approach for Determining the Current Ripple RMS in Four-Leg Inverters with the Neutral Inductor

Riccardo Mandrioli, Francesco Lo Franco, Mattia Ricco and Gabriele Grandi ()
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Riccardo Mandrioli: Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy
Francesco Lo Franco: 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

Energies, 2023, vol. 16, issue 4, 1-19

Abstract: This manuscript proposes a novel approach for determining phase and neutral-current-ripple RMS in grid-connected four-leg inverters with the neutral inductor. The harmonic pollution is determined for any arbitrary pulse width modulation (PWM) technique and a generic value of the neutral inductor. Thanks to the proposed approach, it is possible to describe the neutral inductor in a parametric way with respect to phase inductors and obtain a wide range of results, ranging from a direct neutral connection (no neutral inductor) to a conventional three-phase inverter (no fourth wire) for any value of modulation index and common mode injection. The results permit one to compare different design choices in multiple scenarios effectively. The findings were validated by numerical simulations and experimental tests employing the most popular PWM techniques, such as space vector PWM (SVPWM) and discontinuous PWM (DPWM).

Keywords: current ripple; harmonic distortion; switching losses; optimization; four-leg; three-phase four-wire; converter; neutral inductor; pulse-width modulation; grid-connected (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: 2023
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