Optimum and non-optimum 16-pulse Scott connection based AC-DC converters

Abstract

This paper deals with a multi-pulse AC-DC converter that generate DC output voltage having 16 pulsations, fed from orthogonally connected transformers. The orthogonal supply voltages are obtained from the special transformer connection called Scott connection. In this paper the two configurations, canonical and non-canonical arrangements, which are suitable for 16-pulse generation are modelled and analysed. The output voltage ripples are small and the total harmonic distortion in input current (THDi) is also improved compared to the conventional 6-pulse and 12-pulse AC-DC converters.