Closed-loop thyristor current control
5-40
System- and communication configuring D7-SYS - SIMADYN D
Edition 06.2002
When selecting the mode “Pre-control and continuous tracking”
CPI.SVC=1, the current controller converts this actual value into a pre-
control angle CPI.YWP = “EMF angle” and this is added to controller
output CPI.Y.
The pre-control angle CPI.YWP is limited to the effective limits CPI.ZSU
and ZSL
.
( )
( )
-1
SV
if
-1
1
SV
if
1
1
SV
1
-
SV
arcsin
2
SV
f
YWP
<
⇒
=
+
>
⇒
+
=
≥
≤
⇒
∗
=
=
The actual value of the EMF sensing FB EMF must be calibrated as
precisely as possible. The EMF has a deadtime.
The continuous tracking is only possible with separate sensing due to the
average value generation of the current sensing in the Sitor.
Input CPI.CLU allows the current-dependent limiting of the inverter
control limit to be additionally influenced.
The function of the dynamic inverter stability limit is programmed in FB
CAV and requires the connection (CAV.YAU
→
CPI.CLU)
The lower value of CPI.ALU and CPI.CLU acts as limiting for the inverter
control limit and is the dynamic effective control limit, output at CPI.ZSU.
Tracking
Dynamic
inverter control
limit
