Method for neutral-point balancing of a three-level inverter

摘要

The modulation factor (m) is continuously determined for each phase (u,v,w), and monitored in comparison with a modulation factor threshold (Sm). When a first threshold (UDCS1) is not reached or exceeded, and the modulation factor threshold is exceeded, the modulation factor is reduced by selecting a sequence (PM) from a number of sequences, for a selectable time period.