This paper provides a comprehensive analysis of the capacitors voltage switching ripple for three-phase three-level neutral point clamped (NPC) inverter topologies. The voltage ripple amplitudes of the two dc-link capacitors are theoretically estimated as a function of both amplitude and phase angle of output current and the inverter modulation index. In particular, peak-to-peak distribution and maximum amplitudes of the capacitor voltage switching ripple over the fundamental period are obtained. A comparison is made considering different carrier-based pulse-width modulations in the case of almost all sinusoidal load currents, representing either grid connection or passive load with a negligible current ripple. Based on the voltage switching ripple requirements of capacitors, a simple and effective original equation for a preliminary sizing of the capacitors has been proposed. Numerical simulations and experimental tests have been carried out in order to verify the analytical developments.

Capacitors voltage switching ripple in three-phase three-level neutral point clamped inverters with self-balancing carrier-based modulation / Hammami, Manel; Rizzoli, Gabriele*; Mandrioli, Riccardo; Grandi, Gabriele. - In: ENERGIES. - ISSN 1996-1073. - ELETTRONICO. - 11:12(2018), pp. 3244.1-3244.20. [10.3390/en11123244]

Capacitors voltage switching ripple in three-phase three-level neutral point clamped inverters with self-balancing carrier-based modulation

Hammami, Manel;Rizzoli, Gabriele
;
Mandrioli, Riccardo;Grandi, Gabriele
2018

Abstract

This paper provides a comprehensive analysis of the capacitors voltage switching ripple for three-phase three-level neutral point clamped (NPC) inverter topologies. The voltage ripple amplitudes of the two dc-link capacitors are theoretically estimated as a function of both amplitude and phase angle of output current and the inverter modulation index. In particular, peak-to-peak distribution and maximum amplitudes of the capacitor voltage switching ripple over the fundamental period are obtained. A comparison is made considering different carrier-based pulse-width modulations in the case of almost all sinusoidal load currents, representing either grid connection or passive load with a negligible current ripple. Based on the voltage switching ripple requirements of capacitors, a simple and effective original equation for a preliminary sizing of the capacitors has been proposed. Numerical simulations and experimental tests have been carried out in order to verify the analytical developments.
2018
Capacitors voltage switching ripple in three-phase three-level neutral point clamped inverters with self-balancing carrier-based modulation / Hammami, Manel; Rizzoli, Gabriele*; Mandrioli, Riccardo; Grandi, Gabriele. - In: ENERGIES. - ISSN 1996-1073. - ELETTRONICO. - 11:12(2018), pp. 3244.1-3244.20. [10.3390/en11123244]
Hammami, Manel; Rizzoli, Gabriele*; Mandrioli, Riccardo; Grandi, Gabriele
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/664014
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