多电平逆变器SHEPWM问题解的包含关系

Inclusion Relationship of the Solutions of SHEPWM Techniques for Multilevel Inverters

为了利用已知的较低电平数多电平逆变器特定谐波消除脉宽调制(selected harmonic elimination pulse width modulation,SHEPWM)问题的解,来构建、丰富和完善具有较多电平数的多电平逆变器的SHEPWM问题的解的集合,该文从SHEPWM非线性方程组的形式、多电平逆变器输出电平的物理概念、多电平逆变器SHEPWM问题解的多重性等方面出发,提出并研究了多电平逆变器SHEPWM问题解的包含关系。以级联多电平逆变器为例,对七电平逆变器M=0.38、五电平逆变器M=0.76和三电平逆变器M=1.14时的方程组的数值解进行了实验研究,结果证明了所求数值解能够实现基波控制、谐波消除目标、七电平对五电平和三电平、五电平对三电平逆变器SHEPWM问题的解包含关系。

The fact that the solutions of the SHEPWM （selected harmonic elimination pulse width modulation） techniques for multilevel inverters with more output levels include that of multilevel inverters with fewer output levels is illuminated by means of the expressions of SHEPWM equations, the physics concepts of multilevel inverter and the multiple keys characteristics of the non-linear equations. A three-phase seven-level cascade multilevel inverter prototype is constructed. Solutions of the SHEPWM techniques with M=0.38 for seven-level inverter, M=0.76 for five-level inverter and M=1.14 for three-level inverter is experimentally verified, which proved the conclusions proposed.