NPC变换器中点平衡控制SPWM与SVPWM等效性研究  

Research on equivalence of neutral-point balanced SPWM and SVPWM in NPC converters

作　　者：陈兮 郭博文 张先鹤 CHEN Xi;GUO Bo-wen;ZHANG Xian-he(School of Electical Engineering and Automation,Hubei Normal University,Huangshi 435002,China)

机构地区：[1]湖北师范大学电气工程与自动化学院,湖北黄石435002

出　　处：《湖北师范大学学报（自然科学版）》2023年第3期16-23,共8页Journal of Hubei Normal University：Natural Science

基　　金：基于饱和约束的网络化多自主体系统一致性及能耗优化问题研究(国家自然科学基金62173130);低载波比条件下NPC三电平变换器中点电压失衡机理与平衡策略研究(湖北省教育厅科学研究计划指导性项目B2020132)。

摘　　要：单相三电平NPC变换器自身硬件结构特点使得其中点不平衡问题在研究相关控制策略过程中成为不可忽视的重要因素,针对单相三电平常用的SPWM和SVPWM两种调制策略,巧妙地从PWM信号占空比角度出发,经过严格的数学分析与推导,证明了利用零序注入实现中点电压平衡控制的SPWM与利用正负小矢量互补特性控制中点电压平衡的SVPWM仍然等效,最后给出了相同条件下两种调制方式的仿真结果,进一步证明两者的等效关系,从而揭示了不同调制方法形散神聚的本质。Due to the hardware structure characteristics of single-phase three-level NPC converter,its neutral-point unbalancing has become an essential factor that cannot be ignored in the study of related control strategies.By using SPWM and SVPWM,two modulation strategies commonly used in the single-phase three-level,this paper conducted rigorous mathematical analysis and derivation from the perspective of PWM signal duty cycle and proved that SPWM using zero-sequence injection to control neutral-point voltage balance control is still equivalent to the SVPWM that uses the complementary characteristics of positive and negative small vectors to control neutral-point voltage balance.Finally,it put forward the simulation results obtained by the two modulation methods under the same conditions to prove the equivalence,which thus revealed the two modulation methods can achieve the same effect in essence.

关 键 词：正弦脉宽调制 空间矢量调制 三电平 中点平衡 

分 类 号：TM464[电气工程—电器]