Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) - Manual (Page 31)

Publication 2364F-5.01– October 2003
Overview 1-15
If I
d
were commanded to be equal to 0, V
RGU
would be
increased in magnitude and shifted closer toward V
line
(to
neutral) as shown in Figure 1.14, then we would have the
condition where the same amount of real current would be
flowing, but now I
d
would be equal to zero. I
line
would be
equal to I
q
and in phase with V
line
. The power factor is now
unity.
Figure 1.13
Motoring Current Vector Diagram (Unity pf)
Figure 1.14
Voltage Vector Diagram
Notice that in Figure 1.13 and Figure 1.15, V
line
and I
line
are in
phase with each other and that the RGU is supplying power to
the DC bus.
Figure 1.15
Motoring Line Voltage and Current Waveforms (Unity pf, Iq > 0, Id = 0)
V
line
To Neutral
I
q
= I
line
Please note: XL*I
d
= 0
V
RGU
V
line
To Neutral
XL*I
q
V
line
I
line