Optimized 12-Pulse Rectifier With Generalized Delta Connection Autotransformer and Isolated SEPIC Converters for Sinusoidal Input Line Current Imposition

• Published in: IEEE transactions on power electronics Vol. 34; no. 4; pp. 3204 - 3213
• Main Authors: de Oliveira Costa Neto, Antonio, Soares, Ana Lucia, de Lima, Gustavo Brito, Rodrigues, Danillo Borges, Coelho, Ernane Antonio Alves, Freitas, Luiz Carlos Gomes
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-04-2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 12-pulse rectifiers; AC/DC converter; autotransformer; Autotransformers; Circuits; Converters; Data buses; harmonic; Harmonic analysis; Harmonic distortion; Inductors; Line current; multipulse rectifiers; Phase locked loops; Power factor; power factor correction; Rectifiers; Static power converters; Switches; Voltage control; Voltage converters (DC to DC); Windings
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2018.2850280

This paper discusses an alternative to reduce harmonic current distortion in a 12-pulse rectifier. The circuit is based on a generalized autotransformer connection with low power-to-core that feeds two isolated SEPIC converters. Compared to other passive devices operating as conventional 12-pulse rectifiers, besides a tight dc bus, the use of static converters can, by means of an active current imposition, provide very low harmonic distortion of current. This paper presents a theoretical analysis which is corroborated by computational and experimental results. The results show that the performance of the proposed converter is similar to the performance provided by three-phase unity power factor PWM rectifiers, however, only two active switches are deployed.