三电平NPC逆变器的一种新型SVM混合段法调制策略  

New Hybrid SVM Strategy for Three-level NPC Inverter

作　　者：郑宏[1] 赵伟[1] 邝文明[1] 柳耀刚[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《电气传动》2014年第1期45-48,共4页Electric Drive

基　　金：国家自然科学基金项目(61074019)

摘　　要：采用传统的空间矢量调制方法(7段法、9段法等)应用于三电平NPC逆变器时会出现通断次数多的缺点,并且为了消除偶次谐波和保持中性点平衡,需要将每个扇区划分成两个区域,这会导致算法的复杂和采样受限制的情况。针对此,提出了4段法和6段法的混合调制方法。仿真结果表明这种方法可以在不分a、b区间情况下消除偶次谐波、减小开关损耗。此外,还给出了在中性点不平衡的情况下,既调节了中性点平衡又尽量减少偶次谐波的开关调制策略。The traditional SVM methods （seven section method,nine section method,etc.）applied in three-level neutral point clamped （NPC） inverter result in more switch frequency,complex algorithm and restricted sampling period.In order to solve the above problem,proposed four-segment method and six-segment method mixed instead of the same segment in one sector.The strategy which eliminates even-order harmonic and reduces switch loss without selecting a region or b region has been verified by simulation results.A modulation strategy was gived to reduce evenorder harmonic as far as possible in neutral point unbalance situation.

关 键 词：偶次谐波 三电平 逆变器 开关损耗 中性点平衡 60°坐标系 

分 类 号：TM464[电气工程—电器]