Software method versus hardware method to balance capacitors voltages for three level NPC converter

Abstract

This paper presents a comparison between our software method for balancing capacitors voltages for three-level neutral-point-clamped (NPC) inverters and hardware method. Our method modifies the space vector. We append a new variable to adjust the dwelling distribution times of middle voltages vectors as follows the connection voltages behavior. We give simulations to compare the validity of the two methods.