Abstract
The PAM-type-PWM and the single-phase PWM method for the three-phase converter were presented. On the other hand, the author proposed a control method that combines the pulse space modulation and dc-current control on the three-phase current-fed inverter that is used for utility interactive system. These methods reduce the switching power loss under high power factor conditions to 1/8 compared to the conventional three-phase modulation method. In this paper, the author describes static characteristics of the inverter to which the proposed method was applied. The proposed method can control the output currents to sinusoidal waveforms under not only ideal line voltage but also a distorted or unbalanced line voltage waveforms.
