A Simple 24-Pulse Rectifier Combing Power Electronic Phase-Shifting Transformer and Pulse Doubling Inter-Phase Reactor

A simple 24-pulse rectifier combing power electronic phase-shifting transformer (PEPT) and pulse doubling inter-phase reactor (PD-IPR) is presented in this article to reduce the volume/weight of the 12-pulse rectifier. The 24-pulse rectifier which is proposed in this study comprised a PEPT, two three-phase diode bridges and a PD-IPR. The PEPT includes an AC/AC converter and a medium-frequency phase-shifting transformer (MF-PST). The modulation of AC/AC converters facilitates the operation of the MF-SPT in the medium-frequency (MF) state, which can help decrease the volume/weight of the AC/DC converter effectively. The PD-IPR extracts a specific current to multiply the output states of three-phase diode bridges, which, correspondingly, upgrades the 12-pulse rectifier to a novel 24-pulse rectifier. The input line current harmonics are then effectively reduced. The propose 24-pulse rectifier can be control and implement easily because AC/AC converter operates in an open-loop state under 50% duty cycle. The theoretical analysis is verified by simulation results.