Current loop regulation, Current loop regulation -13 – Rockwell Automation 2364F Regenerative DC Bus Supply Unit (RGU) User 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

and I

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

and I

regulation

2. PWM saturation regulation

3. DC to AC transformation

4. AC to DC transformation

5. reference angle generation

& I

Regulation

DC to AC

Transformation

PWM

Saturation

Regulator

AC to DC

Transformation

Signals to Gate
Driver Boards

Voltage Loop I

and I

Commands Scaled for DSP

Reference

Angle

Generation