基于SVPWM的二极管箝位逆变器中点电压控制  

Common mode voltage and neutral point voltage balance control based on virtual vector diode clamped inverter

作　　者：陶彩霞[1] 万应利 杜雪 付明禄 TAO Caixia;WAN Yingli;DU Xue;FU Minglu(College of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730000,Gansu,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730000

出　　处：《储能科学与技术》2020年第3期927-934,共8页Energy Storage Science and Technology

摘　　要：三电平逆变器中点电压平衡问题一直是国内外学者的研究热点。本工作针对NPC三电平逆变器的共模电压抑制与中点电压平衡问题提出了解决方案。文中在构建虚拟矢量时忽略正小矢量,从而减小因正小矢量引起的较大的共模电压,从而使共模电压降低。其次,根据直流侧上下电容的电压差,构建满足需求的虚拟矢量,使中点电压趋近平衡。最后,建立下一采样周期的中点电压预测模型,并考虑输出波形的质量建立函数,根据拉格朗日数乘法求得各矢量分配时间得最优解,在MATLAB/Simulink中进行仿真,仿真结果表明本工作所提方案能够抑制共模电压,并能够有效控制中点电压平衡。The neutral-point voltage balance of three-level inverters has always been a research hotspot for researchers worldwide. This paper discusses common-mode voltage suppression and neutral-point voltage balance in three-level inverters for NPC. When constructing virtual vectors, the positive small vectors are neglected as they cause a large common-mode voltage. Second, depending on the voltage difference between the upper and lower capacitors on the DC side, a virtual vector that meets the demand is constructed to balance the neutral point voltage. Finally, a model that predicts the midpoint voltage in the next sampling period is established and an index measuring the quality of the output waveform is input to a function. Each vector allocation time is optimized by Lagrange multiplication. A simulation study conducted in MATLAB/Simulink showed that the proposed scheme suppresses and effectively controls the common-mode voltage.

关 键 词：二极管箝位逆变器 空间矢量 共模电压抑制 中点电压平衡 

分 类 号：TM464[电气工程—电器]