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

Aleksandr Viatkin, Riccardo Mandrioli, Manel Hammami, Mattia Ricco and Gabriele Grandi
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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

Energies, 2021, vol. 14, issue 5, 1-31

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.

Keywords: current ripple; harmonic distortion; switching losses; optimization; four-leg; three-phase four-wire; converter; neutral inductor; pulse-width modulation (PWM); electrical vehicle on-board charger (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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