【摘要】 中点电位平衡问题是三电平NPC逆变器的一个固有问题。介绍了三电平NPC逆变器的重要的中点电位平衡控制方法。基于空间矢量PWM法介绍了适用于普通调制和适用于高调制系数的方案。基于注入零序电压的载波调制法介绍了一种全面、准确的控制方案和针对GTO的最小开通时间的控制方案。最后介绍了与具体的PWM调制模式分离的一种新型的滞环控制法。更多还原

【Abstract】 The neutral-point balancing is an inherent problem of the three-level NPC inverter.The most important control strategies was presented.First,the methods based on SVPWM for the normal modulation and the high modulation index were introduced.Then,a full and accurate control based on carrier and a measure considered the minimumn on-time of GTO were illustrated.Last,a new hysteresis-band control being independent of PWM mode was explained.更多还原