Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) - Manual (Page 30)

Publication 2364F-5.01– October 2003
1-14 Overview
When current flows in the motoring direction, the voltages
across the line reactor (XL * I
q
and XL * I
d
) are rotated 90° as
shown as shown in Figure 1.11.
Figure 1.11
Voltage Vector Diagram
Figure 1.12 shows what the I
line
and V
line
waveforms look like
for a lagging pf.
Figure 1.12
Waveforms (Lagging pf, Iq > 0, Id < 0)
V
RGU
is controlled by the RGU to be at the proper magnitude
and phase angle with respect to V
line
so that the commanded I
q
and I
d
exist. In Figure 1.10, Figure 1.11, and Figure 1.12, I
d
is
commanded to be slightly positive to provide a lagging power
factor, and I
q
is commanded to be at some non-zero motoring
current level.
V
line
To Neutral
XL*I
q
XL*I
d
V
RGU
V
line
To N eutral
I
line