The traditional 6-pulse high-power rectifier has defects such as large harmonic content and low power factor in application. The 24-pulse rectification system based on autotransformer can restrain the harmonics and improve power factor effectively. This paper derivate the input current and output voltage’s characteristics of 24-pulse rectification system under balanced grid. At the same time, the author simulate and analysis various impacts of different situations of unbalanced grid on these two characteristics on the basic of real grid ,which has an important guiding significance on the application of the 24-pulse rectification system.
