级联H桥多电平逆变器调制策略的优化  

Optimization of modulation strategy for multilevel cascaded H-bridge inverter

作　　者：高建树[1] 刘乐涛 田翼萌 GAO Jianshu;LIU Letao;TIAN Yimeng(College of Airport Engineering,CAUC,Tianjin 300300,China;College of Electronic Information Engineering,CAUC,Tianjin 300300,China)

机构地区：[1]中国民航大学机场学院,天津300300 [2]中国民航大学电子信息与自动化学院,天津300300

出　　处：《中国民航大学学报》2023年第1期30-34,共5页Journal of Civil Aviation University of China

摘　　要：针对中频逆变器传统载波移幅调制策略输出电压谐波含量高、波形质量差等问题,提出一种基于级联H桥多电平逆变器拓扑的改进载波移幅正弦脉宽调制(SPWM,sinusoidal pulse width modulation)策略。该策略在同相层叠法移幅调制的基础上对三角载波进行改进,将传统三角波与直线结合形成组合载波,改变载波与调制波交点位置,从而使得开关器件脉冲宽度更宽,有效降低输出电压总谐波失真(THD,total harmonic distortion)值,使输出波形质量更好。最后在Matlab/Simulink中搭建级联H桥逆变器仿真模型,通过仿真对比传统调制策略和改进调制策略两种控制下的输出电压THD值,验证了改进载波移幅调制策略的可行性。Aiming at the problem of high harmonic content and poor waveform quality in output voltage of traditional carrier amplitude shift modulation strategy of intermediate frequency inverter,the improved carrier amplitude shift sinusoidal pulse width modulation(SPWM)strategy is proposed based on the multilevel cascaded H-bridge inverter topology.In this strategy,the triangle carrier is improved on the basis of in-phase stack amplitude shift modulation.Traditional triangle wave and the line are comprised to form a combined carrier,and the intersection position of the carrier and the modulation wave is changed,so that the pulse width of the switching device is wider,which effectively reduce the total harmonic distortion(THD)value of output voltage and improve the quality of output waveform.The simulation model of cascaded H-bridge inverter is built in Simulink of Matlab,and THD value of output voltage under the control of traditional and improved modulation strategy is compared through simulation,which verifies the feasibility of the improved carrier amplitude shift modulation strategy.

关 键 词：中频逆变器 谐波 改进正弦脉宽调制SPWM 总谐波失真 

分 类 号：TM464[电气工程—电器]