Comparative analysis of parallel operation of two three phase systems with and without Interphase transformer

In this paper, we have discussed about the changes in the system parameters due to the presence of the Interphase transformer (IPT). Two or more rectifier systems with displaced ripple voltages can be paralled with the help of IPT. The parallel operation of two three-pulse controlled converters with IPT is simulated and the difference of with and without the IPT is analyzed. An IPT absorbs voltage difference between DC voltages of the two converters at any instant. The independent operation of the two systems is obtained without any circulating current with the help of IPT. Six-pulse output voltage is obtained by parallel operation of two three phase half bridge controlled converters, similarly twelve pulse output is obtained by connecting two three phase full bridge controlled converters. This results in reduced total harmonic distortions with the use of IPT. This has been verified using MATLAB2014 (a).