Analysis of Input Voltage Switching Ripple in Three-Phase Four-Wire Split Capacitor PWM Inverters

Manel Hammami, Riccardo Mandrioli, Aleksandr Viatkin, Mattia Ricco and Gabriele Grandi
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Manel Hammami: 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
Aleksandr Viatkin: 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, 2020, vol. 13, issue 19, 1-21

Abstract: Three-phase, four-wire split capacitor inverters are currently employed in many applications, such as photovoltaic systems, battery chargers for electric vehicles, active power filters, and, in general, in all grid-tied applications that deal with possible grid voltage and/or current unbalances. This paper provides a comprehensive evaluation of the capacitor-switching voltage ripple and dc-link switching voltage ripple for the three-phase, four-wire, split capacitor inverters. Specifically, analytical formulations of the peak-to-peak and rms values of the voltage ripples are originally pointed out in this paper and determined in the case of balanced three-phase and unbalanced (two-phase and single-phase) output (ac) currents. The obtained results can help in designing the considered inverter and sizing of the dc-link capacitors. Reference is made to the sinusoidal PWM modulation and sinusoidal three-phase output currents with an almost unity power factor, representing a grid-connected application. Extensive numerical simulations have been carried out to thoroughly verify all the analytical developments presented in this paper. Furthermore, some experimental tests, having balanced output currents on the ac side, have been accomplished, validating numerical simulations and analytical developments.

Keywords: inverter; voltage source inverter; three-phase; harmonic distortion; current unbalance; four-wire; split-capacitor; pulse width modulation; voltage ripple; dc-link switching ripple (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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