Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) - Manual (Page 105)

Publication 2364F-5.01– October 2003
Adjusting Voltage and Current Regulation Parameters 9-13
Current Loop Regulation
The current loop, which resides in the DSP processor, is responsible
for processing the voltage I
q
and I
d
commands and generating the
PWM signals for the IGBTs. The voltage loop is executed every
0.5 ms (2 kHz). The current loop is executed every 0.5 ms (2 kHz) for
L, M, and N-code units, or is executed every 0.25 ms (4 kHz) for
J and K-code units. Refer to Figure 9.9 for a current loop block
diagram.
Figure 9.9
Current Loop Block Diagram
Current loop tasks include (Step numbers below correspond to the
functional boxes shown in Figure 9.9):
1. I
q
and I
d
regulation
2. PWM saturation regulation
3. DC to AC transformation
4. AC to DC transformation
5. reference angle generation
I
q
& I
d
Regulation
DC to AC
Transformation
PWM
Saturation
Regulator
AC to DC
Transformation
Signals to Gate
Driver Boards
1 2
3
4
5
Voltage Loop I
q
and I
d
Commands Scaled for DSP
Reference
Angle
Generation