A novel, economical three-phase AC/DC interface having no controllable switching devices is proposed. The key concept is the combined use of nonisolated phase-shifting transformers and DC-side interphase reactors having tapping diodes. The resultant AC input currents take the form of 18-step waveforms having a total harmonic distortion (THD) of 10.1%, which is roughly two thirds that of 12-step waveforms.
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Oguchi et al. (1997) studied this question.
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