一种具有全电压平衡能力的双极性低压直流电网改进型三电平中点钳位变换器系统

Bipolar low-voltage dc grids are an emerging and promising solution for power distribution. As a natural candidate for the distribution converter, the three-level neutral-point-clamped (3L-NPC) converter has inherent but limited capability in balancing the dc voltages during asymmetrical operation. This article begins by investigating the voltage balancing limits of the conventional 3L-NPC in deta...