Cpi, Current Controller - Siemens SIMADYN D Manual

Closed-loop thyristor current control
5.2.7 CPI, current controller
Hardware address
Current setpoint
Pre-control angle
Current actual value
Inverter stability limit, dynamic
Inverter control limit
Rectifier control limit
Setting value, integrator
Pos. inhibit, integrator
Neg. inhibit, integrator
Set. integrator
Mode: Pre-control
KP gain
TN integral action time
Inhibit I component
Enable controller
Fig. 5-21 Representation of CPI in the CFC
Function
Comment
Set I component
Pre-control angle
5-38
CPI
GV AD Y R
R WC YE R
R CPC YWP R
R XC YP R
R CLU YI
R
R ALU QU BO
R ALL QL BO
R SV TA TS
BO ILU YW NF
BO ILL ZSU R
BO S ZSL R
BO SVC
R KP
TS TN
BO PC
BO EN
The function block FB CPI (Current PI Controller) implements a
PI controller with a pre-control and setting input.
The current controller only uses the absolute value of the current
setpoint.
The I component of the controller can be permanently disabled using
CPI.PC=1.
For large setpoint changes, the integrator can be briefly held using
CPI.ILL or CPI.ILU. This prevents the integrator integrating out of control.
The inputs only limit the values in "their direction".
The firing angle limits are entered at CPI.ALL and CPI.ALU as well as at
a higher-level at the firing angle controller PC6.LDU and PC6.LDL.
Internally, the integrator is not limited by the control limits CPI.ALU or
CPI.ALL. The integrator value runs up to the format limit (R=+-3,4e38)!
The controller integrator is loaded with the value at input CPI.SV as long
as the input CPI.S is set to 1.
When the torque direction reverses, the integrator is set by the switch-
over logic stage (SOL.QCS) with the calculated EMF actual value and
output at CPI.YI.
The controller integral component is still limited to this EMF angle
CPI.SVC=1.
For analog control systems, this limit replaces the usual pulse inhibit or
wobbling at low current actual values.
The EMF actual value, conditioned and normalized by FB SOL is
available at setting input CPI.SV. The integrator is set during changeover
with the control command from SOL.QCS at input CPI.S.
Firing angle [ASG]
System deviation [1]
Pre-control angle [ASG]
P component
I component
Pos. limit reached
Neg. limit reached
TA: Current controller [ms]
Firing angle [degrees]
Inverter control limit, RMS [°]
Rectifier control limit, RMS [°]
System- and communication configuring D7-SYS - SIMADYN D
Edition 06.2002