An autotransformer-based 36-pulse controlled AC-DC converter

AbstractThis paper proposes a non-isolated 36-pulse controlled AC–DC converter for medium power rating drives. It involves pulse multiplication in a 12-pulse AC–DC converter. The approach employs a polygon autotransformer arrangement, which results in a near equal leakage reactance in series with each thyristor bridge. The volt–ampere rating of the autotransformer is observed to be small and the converter meets IEEE-519 standard power–quality requirements over a wide range of firing angle.