Modes of operation in parallel-connected 12-pulse uncontrolled bridge rectifiers without an interphase transformer

• Published in: IEEE transactions on industrial electronics (1982) Vol. 44; no. 3; pp. 344 - 355
• Main Authors: TZENG, Y.-S, CHEN, N, WU, R.-N
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.1997; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Bridge circuits; Circuit faults; Councils; Electrical engineering. Electrical power engineering; Equations; Exact sciences and technology; Frequency; Ignition; Inductance; Power electronics, power supplies; Rectifiers; Valves; Voltage control; Operation study; Power converter; Three phase convertor; Voltage regulation; Parallel connection; Alternative continuous converter; Power diode; Modeling; Switching; Bridge convertor
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/41.585832

Parallel operation of two 6-n prepulse uncontrolled bridge rectifiers, to obtain a 12-pulse rectification, without an interphase transformer connected on the DC sides is investigated in this paper. The mechanism of interactions between the two six-pulse bridges is analyzed. As the load current varies from no-load to the complete short-circuit value, seven modes of operation are recognized. Equations describing the mean output voltage and various operating angles of the rectifier circuit are given in terms of a reactance factor. Voltage regulation and variations of the ignition angle and the commutation overlap angle for rectifiers with and without an interphase transformer are also compared.