10 Rockwell Automation Publication 750-RM100A-EN-P - August 2019
Chapter 1 Adaptive Control
Example: The bandwidth = 400 Hz with bus observer disabled. However, the
bandwidth = 150 Hz with bus observer enabled for equivalent DC bus voltage
regulation with lower inductor temperatures.
Bus Observer Limitations
• If the external capacitance is greater than three times the supply, DC bus
regulation can become unstable.
• Do not enter an external capacitance value greater than what is connected
or stability can be affected. It is recommended to use the lowest estimated
value. Bus observer can compensate for increased line capacitance, but it
cannot reduce line capacitance.
• Cannot be enabled or disabled while the converter is active (running).
Figure 2
and Figure 3 show the Bus Observer function.
Figure 2 - Voltage Control (VoltCtrl) Block Diagram
Auto Gain
Calculation
PI Regulator
55
56
Volt Reg BW
Volt Reg Damping
0
1
54
Volt Reg C/U Sel
0
1
59
u Volt Reg Ki
57
u Volt Reg Kp
c Volt Reg Ki 60
c Volt Reg Kp
58
DC Bus Command
50
VoltRefGen [G3]
acitance
Metering [D5]
DC Bus Ob
A[2]
52
Ext Bus Cap
VbusErr
VbusRegKi
VbusRegKp
IqRefVbusReg
Volt Reg C/U Sel Selector:
0- Calculated
1- User Entered
Total Sys Cap
DcBusObs [C1]
BusRegIntegTerm
BusRegPropTerm
BusObsMode
BusObsMode (320):
0- BusObs Only
1- BusObsVltEst
320
3
Port 0,DC Bus Volts
0
1
DC Bus Obs
[H5]
BusObs Volt Est
1
0,2
BusDistRejMode(300):
0- Disabled
1-BusObserver.
2- FF Power.
300
BusCompMode
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