キャリヤ波を用いたマルチレベルPWM法の高調波特性評価

抄録

This paper describes how current harmonics or torque ripples in AC drives vary when different PWM methods or a number of output voltage levels are employed. The harmonic distortion determining factor (HDDF), which represents the intrinsic spectral property of individual PWM methods, is calculated for each of the multilevel PWM methods, and is used as a common quality index. Almost all the carrier-based PWM schemes that have been proposed so far are considered. HDDF values are, for example, helpful for designing AC drive systems because they can be used for predicting the current harmonics or torque ripples.