T型三电平逆变器中点电压平衡控制  

Neutral-point Voltage Balance Control of T-type Three-level Inverter

作　　者：叶满园 韩祥鹏 YE Manyuan;HAN Xiangpeng(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013

出　　处：《电力系统及其自动化学报》2018年第9期16-21,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51767007);江西省教育厅自然科学基金资助项目(GJJ160495)

摘　　要：针对T型三电平逆变器拓扑的中点电压不平衡的问题,提出了一种基于时间分配因子的调节方法来控制中点电压的平衡。分析了其输出电压和开关状态的对应关系及换流过程,研究了空间矢量脉冲调制(SVPWM)方法的调制原理和实现方式,通过调整正负小矢量的时间分配因子实现对中点电压的精确控制。最后在Matlab下建立以T型三电平逆变器拓扑的SVPWM的仿真模型,仿真结果证实了所提出的基于分配因子法的SVPWM是可行的,能有效地抑制中点电压的波动。Considering the problem of neutral-point voltage unbalance in the topology of T-type three-level inverter,a distribution factor method based on PI regulation is proposed to control the balance of neutral-point voltage.The relation-ship between the output voltage and switching state is analyzed,together with the current commutation process.More-over,the modulation principle and implementation of space vector pulse width modulation(SVPWM)are studied,and the exact control of neutral-point voltage is achieved by adjusting the time allocation factor of positive and negative small vectors.Finally,a simulation model of SVPWM based on T-type three-level inverter topology is established in Matlab.Simulation results verify that the proposed method of SVPWM based on distribution factor method is feasible,and it can effectively suppress the fluctuations of neutral-point voltage.

关 键 词：T型三电平逆变器 PI调节 分配因子法 空间矢量脉冲调制 中点电压平衡 

分 类 号：TM464[电气工程—电器]