Frequency-Dependent Network Equivalent
Hi,
I have set up a frequency-dependent network equivalent (FDNE) in PSCAD, which has one port and a connection to earth. I have chosen Z parameters for the input and linked a file, which looks like that:
! Data file for PSCAD FDN
1
58
!
0.0
78.0366 0.0
1.0
78.0222 -0.0018997
10.0
77.9867 -0.019043
28.0
77.95 -0.053729
...
Normally, this should fit the input standard as given in the help database.
Now my problem is, that it only produces NaNs as output, even though the simulation runs without any problems. Anybody has an idea what's wrong?
The log files look like that:
LOG10(FN) FN Calc./Fitted |Y0| Y011c Y011f Y012c Y012f... [mho]
-Infinity 0.0000000 0.33760269 NaN
-0.91611109E-15 1.0000000 0.33766499 NaN
1.0000000 10.000000 0.33781869 NaN
1.4471580 28.000000 0.33797767 NaN
1.6627578 46.000000 0.33809291 NaN
....
FDNE log file
-------------
Component ID :1634572995
Call Number : 2
Input Datafile :../test2.out
Input File : Z Parameters
Number of frequency samples : 58
Fitting Parameters
Number of ports:
1
Residues and poles:
1
NaN
0.000000000000000E+000
NaN
0.000000000000000E+000
NaN
Thanks and kind regards,
Benjamin
Status:
Open Aug 17, 2020 - 11:21 PM
Frequency-Dependent Network Eq, input file, Z parameters
3answers
Voted Best Answer
Aug 19, 2020 - 08:44 AM
Hi Benjamin,
I reviewed your sample case. FDNE shows a pole at zero frequency. You can not use f = 0, as the log will be infinity.
Just change first f to 0.0001 and you will be able to run the case.
If this answer solves your issue, please choose it as the best answer so it helps other users in the future.
Answers
Aug 18, 2020 - 03:32 PM
Benjamin, I would like to help. Can you make an easy sample PSCAD model that demonstrates the issue and upload it?
Aug 18, 2020 - 11:12 PM
Hello Tamer,
I have uploaded one simply example.
Kind regards,
Benjamin
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