98 Rockwell Automation Publication 750-RM100A-EN-P - August 2019
Chapter 10 Droop Control for Parallel Operation of PowerFlex 755TM AFE Bus Supplies
In the Motoring No Load and Regen No Load regions, the value in parameter
13:352 [NoLd DroopGain] determines the slope of the curve. Set the value of
this parameter as percent increase in DC bus voltage reference (percent of
minimum DC bus voltage) over the positive current range (zero load to full
load).
Figure 41 - Full Load Regions
Nonlinear Mode
The Nonlinear Mode uses a continuous curve to determine the DC bus voltage
reference. The function builds a slope curve using two of the parameters from the
Linear Mode. These are 13:351 [FullLd DroopGain] and 13:352 [NoLd
DroopGain]. It builds the slope curve with a slope at full load equal to 1.2 x
13:351 [FullLd DroopGain] and the slope at the no load point equal to 0.3 x
13:352 [NoLd DroopGain].
Figure 42 - Nonlinear Mode
Regenerating
Motoring
Zero Current +Trans Droop
Current
-Trans Droop
Current
-Full Load
Current
+Full Load
Current
Active Current
Zero Current
Slope of Droop
Function
13:351 [FullLd DroopGain]
13:352 [NoLd DroopGain]
0%
Regenerating
Motoring
Zero Current +Trans Droop
Current
-Trans Droop
Current
-Full Load
Current
+Full Load
Current
Active Current
Zero Current
Slope of Droop
Function
1.2 x 13:351 [FullLd DroopGain]
0.3 x 13:352 [NoLd DroopGain]
0%
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