基于Walsh变换的PWM优化脉冲调制方法  

An Optimal PWM Modulation Technique Based on Walsh Transform

作　　者：秦亮[1] 刘开培[1] 张慧[1] 

机构地区：[1]武汉大学电气工程学院,武汉430072

出　　处：《电工技术学报》2007年第4期118-123,共6页Transactions of China Electrotechnical Society

摘　　要：选择性谐波消除技术在计算开关角时涉及到非线性超越方程的求解,需要对开关角赋初值进行离线迭代计算,很难保证初值求解一定收敛,而且选择性谐波消除技术只能控制谐波幅值,不能控制相位。基于上述原因,提出基于Walsh变换的计算方法,得到求解开关角的线性表达式,不需要对开关角赋初值,简单的线性计算就可以得到开关角的值,并且可以同时达到对谐波幅值控制和相位的控制,最后通过算例证明了该方法的正确性。The selective harmonic elimination （SHE） method based on the off-line calculation and the starting value of the switching angles could not always converge to the required solution, and it could only control the amplitude of the harmonics, not the phase. A new method based on the Walsh-transform is proposed to obtain the linear calculation of the switching angles in the paper, which does not need the starting value, and the new method will control both the harmonic phase and the amplitude at the same time. In the end, the effect of the method is validated by an example.

关 键 词：脉冲宽度调制 WALSH变换 选择性谐波消除法 

分 类 号：TM411[电气工程—电器]