Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) - Manual (Page 33)

Publication 2364F-5.01– October 2003
Overview 1-17
How does the RGU allow power to flow from the DC bus to the AC
line (regenerating mode of operation) and control the power
factor?
Commanding I
q
to be negative causes a phase shift in V
RGU
in
order to lead V
line
which regenerates power to the AC line. If I
d
is commanded to be 0, the RGU will operate at unity power
factor as shown in Figure 1.19, Figure 1.20, and Figure 1.21.
Figure 1.19
Regenerating Current Vector Diagram (Unity pf)
Figure 1.20
Voltage Vector Diagram
Notice that in Figure 1.21, V
line
is 180 degrees out of phase
with I
line
, and that the RGU is supplying power to the AC line.
Figure 1.21
Line Voltage and Current Waveforms (Unity pf, Iq < 0, Id = 0)
V
line
To Neutral
I
q
= I
line
0
Please note: XL*I
d
= 0
V
line
To Neutral
XL*I
q
V
RGU
V
line
To Neutral
I
line