The CMMT-ST The plug-in synchronises the parameters of active current regulator and reactive current
regulator if the parameter Px.819 is set (default setting) and a calculation of the controller parameters
is carried out by the plug-in. The calculation can be initiated, for example, via page "Closed loop".
Active current regulator:
The active current regulator is designed as a PI controller (with anti-windup functionality), which calcu-
latesActive current setpoint value – Actual active current valuethe voltage specification U
q_ref
for the
secondary voltage transformation from the control difference.
Reactive current regulator:
The reactive current regulator is designed as a PI controller (with anti-windup functionality), which cal-
culatesReactive current setpoint value – Actual reactive current valuethe voltage specification U
d_ref
for
the secondary voltage transformation from the control difference.
Voltage limitation:
The voltages U
q_ref
and U
d_ref
are evaluated jointly. The voltage phasor calculated from U
q_ref
and U
d_ref
is limited to the maximum output voltage. The status of the respective limitation for U
q_ref
and U
d_ref
can be requested.
Voltage transformation:
The voltage transformation generates the setpoint value specifications for the secondary power out-
put stage from input variables "Voltage setpoint value". This prioritizes the voltage U
d
as default
against voltage U
q
.
Fig. 83 Block diagram of current regulator
Name
Parameters
ID Px.
id_act
Actual reactive current value
813
Control
350
Festo — CMMT-ST-SW — 2019-02
Summary of Contents for CMMT-ST-SW
Page 615: ......
