基于数学推导的级联多电平逆变器性能研究  

Research of the Output Voltage Performance of Cascaded Multilevel Inverter Based on Mathematics Illation

作　　者：唐顺[1] 关振宏[1] 

机构地区：[1]磁浮技术与磁浮列车教育部重点实验室,四川成都610031

出　　处：《电气传动》2009年第10期42-46,共5页Electric Drive

摘　　要：载波相移SPWM技术应用于级联型多电平逆变器,可以达到提高等效开关频率,改善输出性能的效果。而载波相移角度差π/N和2π/N两种移相方式,对不同级联数目的逆变器输出有不同影响。当三相逆变器中功率单元发生故障被切除后,输出电压不再平衡。而利用中性点偏移技术,可使逆变器输出线电压重新达到平衡,从而具备较好的容错能力。通过对载波相移PWM技术和中性点偏移原理的数学推导,得出采用载波相移角π/N方式与中性点偏移技术,逆变器输出性能有较大提高的结论。最后对级联型9电平逆变器A相中某一功率单元故障后状况进行仿真实验,验证了数学推导的正确性。Cascaded multilevel inverter output voltage performance can be improved by gaining the higher equivalent switch frequency when carrier phase-shifted SPWM technique is applied. Two carrier phase-shifted modes of π/N and 2π/N have different results because of the different numbers of cascaded unit. The output voltage of three phase inverter can not keep balance when faulty cells are isolated. However, the line voltage can balance again with better fault tolerant ability when the neutral-shift technique is used. The carrier phase-shifted SPWM and neutral-shift theory were analyzed by mathematics illation and the conclusion that the inverter performance was improved by applying π/N mode and neural-shift technique. Finally, when one faulty power cell of A-phase is isolated in the cascaded nine-level inverter, the result of simulation can verify the validity of the mathematics illation.

关 键 词：载波相移正弦脉冲调制 中性点偏移 级联型多电平逆变器 容错 

分 类 号：TP302.8[自动化与计算机技术—计算机系统结构]