Ys. Tzeng et al., MODES OF OPERATION IN PARALLEL-CONNECTED 12-PULSE UNCONTROLLED BRIDGERECTIFIERS WITHOUT AN INTERPHASE TRANSFORMER, IEEE transactions on industrial electronics, 44(3), 1997, pp. 344-355
Parallel operation of two 6-n prepulse uncontrolled bridge rectifiers,
to obtain a IZ-pulse rectification, without an interphase transformer
connected on the de sides is investigated in this paper, The mechanis
m of interactions between the two six-pulse bridges is analyzed. As th
e load current varies from no-load to the complete short-circuit value
, seven modes of operation are recognized, Equations describing the me
an output voltage and various operating angles of the rectifier circui
t are given in terms of a reactance factor, Voltage regulation and var
iations of the ignition angle and the commutation overlap angle for re
ctifiers with and without an interphase transformer are also compared.