Title :
A phase-controlled 12-pulse rectifier with unity displacement factor without phase shifting transformer
Author :
Blauth, Yeddo B. ; Barbi, Ivo
Author_Institution :
Dept. of Electr. Eng., Fed. Univ. of Rio Grande do Sul, Porto Alegre, Brazil
Abstract :
This paper presents a three-phase 12-pulse phase-controlled rectifier with unity displacement factor, low line current harmonic content, two quadrant operation and the absence of a phase shifting transformer. The circuit is composed by two three-phase 6-pulse rectifiers parallel connected by four balancing reactors. One is a conventional thyristor rectifier with a lag firing angle (α). The other is an active rectifier composed by GTOs or IGBTs and diodes, operating with a lead (and symmetrical) firing angle (-α). The 12-pulse operation with line frequency modulation provides a 5-level line current with reduction or cancellation of certain harmonics. Circuit operation, theoretical analysis, key equations, along with experimental and simulation results are presented
Keywords :
AC-DC power convertors; frequency modulation; harmonic distortion; power factor; power system harmonics; rectifying circuits; GTOs; IGBTs; balancing reactors; diodes; lag firing angle; line current harmonics; line frequency modulation; three-phase twelve-pulse phase-controlled rectifier; thyristor rectifier; two quadrant operation; unity displacement factor; Analytical models; Circuit analysis; Circuit simulation; Diodes; Equations; Frequency modulation; Inductors; Insulated gate bipolar transistors; Rectifiers; Thyristors;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1998. APEC '98. Conference Proceedings 1998., Thirteenth Annual
Conference_Location :
Anaheim, CA
Print_ISBN :
0-7803-4340-9
DOI :
10.1109/APEC.1998.654016