摘要
开绕组拓扑在中压大功率变频驱动领域具有较好的优势。针对独立直流母线双三电平中点嵌位式(dual-three-level neutral point clamped,Dual-3L-NPC)串联结构,分析了其数学模型和矢量构成方式,提出了基于单相零序电压和三相零序电压联合注入的正弦脉宽调制(sinusoidal pulse width modulation,SPWM)调制方式,单相零序电压的注入改变单个变流器空间位置,但2组变流器矢量叠加后仍然保持合成矢量位置不变。以单相零序电压和三相零序电压为手段,分别实现最近三矢量为目标和损耗最优为目标的调制策略。仿真和实验结果证明了调制策略的可行性和有效性。
Open-end winding topology reflects an advantage in MV high power field for AC drives. Based on dual 3L-NPC converter with isolated DC link topology, mathematical model and space vector distribution are analyzed, and single-phase zero sequence voltage and three-phase zero sequence voltage united injection SPWM strategy is presented. Single-phase zero sequence voltage changes space position of each converter, but resultant vector of two converters added is unchanged. Single-phase zero sequence voltage and three-phase zero sequence voltage can be used to realize the nearest three vector and optimal loss modulation strategies. Simulation and experiment results confirm value of this modulation strategy.
出处
《电网技术》
EI
CSCD
北大核心
2016年第8期2456-2463,共8页
Power System Technology
关键词
开绕组
独立直流母线
单相零序电压
零序注入SPWM
open-end winding
isolated DC link
single-phase zero sequence voltage
zero sequence injection SPWM
