三电平ANPC变流器损耗平衡的SVPWM策略

SVPWM strategy for loss balance of three-level ANPC converter

针对三电平有源中点钳位(active neutral point clamped ,ANPC)变流器开关器件在工作中存在损耗不平衡的问题,给出一种改进的平衡策略。以a相为例,对三电平ANPC变流器损耗不平衡的原因进行分析,采用空间矢量脉冲宽度调制(space vector pulse width modulation,SVPWM)策略,通过合理选择相同的过渡状态,从而减少开关管动作实现损耗平衡。相比传统SVPWM策略,该方法使桥臂开关器件的不平衡度从23.12%降到6.37%,钳位开关器件的不平衡度从11.19%降到4.71%。此方法可应用于提升电机变频调速、高压输电等场所下变流器的容量和使用寿命。

Aiming at the problem of loss imbalance in operation of three-level active neutral point clamped (ANPC) converter switching devices, this article provides an improved balancing strategy.Take phase as an example. The reasons for the loss of the three-level ANPC converter′s unbalanced loss were analyzed, and the space vector pulse width modulation (SVPWM) strategy was used to reduce switch action to achieve loss balance by reasonably selecting the same transition state. Compared with the traditional SVPWM strategy, this method reduced the unbalance of the bridge arm switch from 23.12% to 6.37%, and the unbalance of the clamp switch from 11.19% to 4.71%.It can be used to increase the capacity and service life of converters in places such as motor frequency conversion speed regulation and high-voltage power transmission.