基于主电路级联的最优PWM开关角的在线计算  

Online Calculation of Optimal PWM Switching Angles Based on Cascaded Multilevel Inverter

作　　者：刘辉[1] 毕世华[1] 孟秀云[1] 陈阵[1] 

机构地区：[1]北京理工大学,宇航学院,北京100081

出　　处：《电力电子技术》2011年第11期61-63,共3页Power Electronics

摘　　要：针对PWM逆变器特定消谐(SHE)技术中开关角求解难度大的问题,利用Matlab曲线拟合技术可在线计算开关角的值。为了满足高压大功率应用领域的需要和实现波形的多重移相叠加,主电路采用级联多电平逆变器。主要研究了三相逆变器开关角初值计算规律和求解方法,给出了三相多电平逆变器消谐PWM模型及求解结果,实现了SHE技术的实时控制。Matlab仿真和DSP实验验证了消谐模型设计的合理性。Due to the difficulty of calculating switching angles, the values of the angles are achieved by using the curve fitting technique（CFT） and programs of Matlab.Cascaded multilevel inverter is adopted in the structure of the main circuit.This design can implement the multiple-phase shifting and meet the need of using the high voltage and large power equipments.A method to selected harmonic elimination（SHE） choosing initial values is presented in a three-phase full-bridge voltage source inverter.The model of the SHEPWM and the results are given.And the online real-time control of SHE is realized.The simulation and experimental results are separately done by Matlab and DSP.So the rationality of the design is verified.

关 键 词：逆变器 曲线拟合技术 特定消谐 

分 类 号：TM464[电气工程—电器]