偶次谐波消除的NPC逆变器矢量调制策略

A Control Strategy for Even-order Harmonics Suppression Applied to Three-level NPC Converters

基于三电平中点箝位(NPC)逆变器,分析了传统空间矢量脉宽调制(SVPWM)策略产生偶次谐波的机理,提出了三电平NPC逆变器偶次谐波消除空间矢量选择需遵循的原则,详细阐明了三电平NPC逆变器与两电平逆变器在偶次消谐方面的区别,在此基础上提出了两种优化的偶次谐波消除策略的脉冲分配方式,并通过仿真以及实验验证了所提出偶次消谐策略的正确性。

Based on neutral point clamped （NPC） three-level converter, the production principles of even-order harmonics with normal space vector pulse width modulation （SVPWM） are analyzed.Principles for SVPWM of even-order harmonics suppression applied to three-level NPC converters are put forward, and the differences between three-level NPC converter and two-level converter are indicated.Two optimized pulse distribution methods are presented for even-order harmonics suppression.Simulation and experimental results are given to verify the effectiveness of the proposed methods.