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In this paper, a novel rectifier transformer that has a round-shaped structure is investigated. The transformer can convert three-phase power into 12-phase, which supplies to a rectifier composed by four bridges for producing dc voltage with 24-pulse. With such transformers, rectifier performance can be improved in both input and output waveforms. The principle of harmonics elimination is explained...
A 12-Pulse Converter generally uses a phase-shifting transformer to get two sets of three-phase voltages, but the magnitude of the line current harmonic is too high. In this paper, a new type of 12-Pulse Converter featuring a rotating magnetic field transformer is presented. The design is based on the rationale of the induction machine, which can effectively reduce the line current harmonic and improve...
In multi-module inverter systems, phase-shifting transformers are needed to compose non-sinusoidal voltages into staircase waveforms approaching sinusoid. Aiming at the drawbacks of normal phase-shifting transformers with respect of installation and operation, the paper proposes a novel transformer of round shape resembling induction motor. Contrast to the normal phase-shifting transformers, the iron...
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