三电平有源层叠中点钳位式变换器拓扑分析

Research of Three-level Active Stacked Neutral Point Clamped Converter

传统中点钳位(NPC)三电平变频器存在功率器件损耗不平衡问题,限制了变频器容量和功率器件开关频率的提升。有源钳位式NPC拓扑或者层叠式NPC拓扑可以产生更多的零电平状态实现功率器件损耗平衡。有源层叠式中点钳位式拓扑是有源钳位式NPC的衍生拓扑。对有源层叠中点钳位式NPC拓扑进行分析,利用交替反向层叠式(APOD)PWM进行脉宽调制。通过仿真验证该拓扑的工作特点和APOD-PWM算法的有效性。

Traditional neutral point clamped （NPC） three-level converter has loss unbalance problem which limits the power capability and switching frequency. However, this problem can be overcomed by active NPC or stacked NPC topology since their additional zero states. Active stacked NPC is a derive topology of active NPC. The operating concept and control algorithm of ASNPC were studied, the APOD-PWM was used to modulate pulse width. Simulation results validate the analysis and APOD-PWM strategy of proposed topology.