基于Walsh变换的多电平逆变器谐波消除技术(英文)

Selective Harmonic Elimination Technique Based on Walsh Transform for Multilevel Inverters

将Walsh函数引入到多电平逆变器选择性消谐法(SHE)开关角的求解中。为此,在介绍Fourier-Walsh变换的基础上,得出了级联型多电平逆变器基于Walsh函数的消谐模型,并提出了一种快速求解消谐模型在基波幅值整个变化范围内开关角的全部解的方法。应用分析表明所提方法是可行的,级联型多电平逆变器开关角的解是关于基波幅值的分段线性方程。因此,所得的分段线性方程解决了逆变器SHEPWM技术在线求解开关角的难题。最后,多个算例的计算结果和实验结果证实了该方法的正确性。

This paper applies the Walsh function to selective harmonic elimination （SHE） technique in a multilevel inverter so as to gain the solutions of the switching angles. Based on the principle of Fourier-Walsh transform, the SHE model with Walsh function for a multilevel inverter is derived and a method is proposed to solve the switching angles quickly in the full range of fundamental voltage. As the solutions of the switching angles for cascade multilevel inverter are expressed as piecewise linear equations with the fundamental amplitude, the problem of on-line calculating the inverter＇s switching angles can be solved. Finally, the calculation results and experimental results verify the feasibility and efficiency of the proposed method.