A new active interphase reactor for 12-pulse rectifiers provides clean power utility interface

In this paper, a new active interphase reactor for twelve-pulse diode rectifiers is proposed. The proposed system draws near sinusoidal currents from the electric utility. In this scheme, a low kVA (0.03 per unit) active current source injects a triangular current into an interphase reactor of a twelve-pulse diode rectifier. The modification results in near sinusoidal input current with less than 1% THD. It is further shown that a low kVA, 12-pulse system with an autotransformer arrangement (kVA rating of 0.18 per unit) can be implemented with the proposed modification. The resulting system draws clean power from the utility and is suitable for powering larger kVA AC motor drive systems. Detailed analysis of the proposed scheme along with design equations is illustrated. Simulation results verify the concept.