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
01.01.2018
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC: | 629 |
A Three-Phase Voltage-Source Neutral-Point-Clamped Converter with Divided Capacitors
Online Contents | 1997
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