ABB ACS 600 User Manual page 49

Chapter 6 – Firmware Description
REACTIVE POWER
1.07
-
RAMPING
Q POWER REF
24.01
120.01 QPOW RAMP UP
120.02 QPOW RAMP DOWN
6-16
Reactive power control is capable of generating a preset amount of
reactive power (Parameter 24.01 Q POWER REF) to the network
(positive = capacitive, negative = reactive) by changing the flux length.
Increasing the ISU flux length higher than the network flux length,
capacitive power is generated to the network and vice versa. Increased
flux means that the output voltage of the ISU is higher than the network
voltage.
Reactive power control parameters are listed below.
Code
2.07 150.02 DC REF INITIALIZ
150.01 FLUX REF USED
2.05 113.05 DC REF Q-CTRL
130.02 FLUX SQ REF
24.01 123.04 Q POWER REF
1.07 161.15 REACTIVE POWER
120.03 QPOW RAMP UP
120.04 QPOW RAMP DOWN s
130.01 FLUX REF
130.03 FLUX REF LENGTH
A block diagram of reactive power control is shown below.
FLUX REF USED NOM
150.1
FLUX REF USED NOM
150.1
PI CONTROLLER
FILTER
+
123.06 REACT
123.07 REACT
Parameter Unit Description
V
%
NOM
V
%
%
kVAr Calculated reactive power
s
%
%
X
FLUX REF
130.01
Antiwindup
CTRL GAIN
CTRL INTEG
CALCULATION
FLUX REF USED NOM
150.01
DC REF INITIALIZ
2.07
Nominal DC voltage
Nominal flux reference
DC voltage reference from cosfii control
Squared flux reference from cosfii control
Reactive power in percentage of the
nominal power
Ramp up time
Ramp down time
PI controller output
Flux reference from cosfii control
+
FLUX SQ REF
130.02
+
FILTER
ACA 635 IGBT Supply Sections
FLUX REF LENGTH
130.03
DC REF Q-CTRL
2.05