Title :
Modes of operation in parallel-connected 12-pulse uncontrolled bridge rectifiers without an interphase transformer
Author :
Tzeng, Yii-Shen ; Chen, Nanming ; Wu, Ruay-Nan
Author_Institution :
Dept. of Electr. Eng., Oriental Inst. of Technol., Pan Chiau, Taiwan
fDate :
6/1/1997 12:00:00 AM
Abstract :
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
Keywords :
bridge circuits; commutation; electric reactance; rectifying circuits; short-circuit currents; voltage control; 12-pulse uncontrolled bridge rectifiers; 6-n prepulse uncontrolled bridge rectifiers; commutation overlap angle; ignition angle; interphase transformer; load current; mean output voltage; no-load; operating angles; operation modes; parallel-connected rectifiers; reactance factor; rectifier circuit; short-circuit value; six-pulse bridges; voltage regulation; voltage variations; Bridge circuits; Circuit faults; Councils; Equations; Frequency; Ignition; Inductance; Rectifiers; Valves; Voltage control;
Journal_Title :
Industrial Electronics, IEEE Transactions on
