Voltage Balancing in Double Three-Phase NPC Inverters for Powering Two Three-Phase Electric Motors with a Common DC Bus

This paper presents an analysis of the voltage balance in double-three-phase neutral-point-clamped (NPC) inverters connected to two three-phase electric motors with distinct electrical characteristics and parameters. This study examines the factors that contribute to voltage unbalance in a dual-three-phase NPC inverter and the potential avenues for enhancing converter efficiency while maintaining capacitor balance. The experimental validations illustrate the effectiveness of the proposed methodologies in accounting for diverse motor loads and control strategies. These findings provide valuable insights into the design and operation of such systems, making them applicable to diverse industrial contexts.