High power motor drive converter system and modulation control

摘要

A high power motor drive converter (10) includes a three level neutral point (26) clamped (NPC) output power conversion stage (12) including switches (14); a split series connected DC capacitor bank (30) coupled in parallel with the NPC output power conversion stage; and a controller (15) for selecting switch positions for controlling the NPC output power conversion stage and controlling a neutral voltage balance of the DC capacitor bank by using space vector modulation and predictive charge calculations.