脉幅调制(PAM)逆变器谐波的削减

Reduction of the Harmonic Waves of the PAM Inverter

本文从实用角度出发,在分析了单相逆变器输出矩形脉冲电压的傅氏级数后,推导出与电机交流绕组系数完全相同的谐波削减系数。再根据对谐波削减程度的要求,合理选择组成脉幅调制逆变器的单相逆变器台数和输出矩形脉冲电压宽度缩短角和初相角,从而有效地抑制了输出电压中的谐波分量,简化了滤波电路,设计出一些结构简单,运行可靠,经济实用的脉幅调制(PAM)逆变器。

Based on the analysis of the Fourier series of the square pulse voltage transmitted by the single-phase Inverter, this paper develops a harmonic reduction coefficient, which is identical with the breadth coefficient of the alternator. To meet the requirement of the harmonic reduction degree, the paper properly chooses the number of single phase inserters composing the pulse amplitude modulation inverter, and (?)lso the (?)hortened pulse width angle of output square pulse voltage and the initial phase angle. In so doing, the harmonic waves in the output voltage can be efcectively controlled, and its circuit simplified. Accordingly, some PAM inverters can be designed, which. will be sfructurally simple, operationally reliable, economical and practical.