Analysis of 12 pulse phase control AC/DC converter

摘要

In this paper, the unbalanced current in the 12-pulse phasecontrol AC/DC converters was studied. The 12-pulse Δ-Y type AC/DCconverter will keep a balanced voltage with 30° phase shifted at thelow coupling coefficient condition, but an unbalanced current will beobtained in the 12-pulse autotransformer phase shift AC/DC converter atthe low coupling coefficient condition. The theoretical phasor analysisof the unbalanced current was presented and a feedback controller wasdesigned to overcome this problem. Finally, a 3 kW 12-pulseautotransformer phase shifted AC/DC converter was implemented todemonstrate the theoretical analysis