基于载波层叠PWM的维也纳整流器中点电压平衡控制方法

Neutral-point voltage balance control method of Vienna rectifier based on carrier disposition PWM

本文提出了一种基于载波叠层PWM和零序电压注入的中点电位平衡控制方法,首先推导中点电流与相参考电压的关系,然后分析可选零序电压的范围,得到了中点电流与可选零序电压的线性关系表达式,然后根据中点电压的偏移量选择最优的零序电压实现了中点电位的平衡控制。

This paper propose a control method of neutral-point potential balance based on carrier disposition PWM and zero-sequnce voltage injection.First,the relationship between the neutral-point current and the phase reference voltage is derived.Then the range of the optional zero-sequence voltage is analyzed,and the linear relationship between the neutral-point current and the optional zero-sequence voltage is obtained.Finally,according to the offset of the neutral-point voltage,the optimal zero-sequence voltage is selected to realize the balance control of the midpoint potential.