User model with electric interface

[Anonymous]

Hi,

I have two questions on building user model interfacing electric models, and would appreciate very much if anyone could help explain a little.

1. I tried to use the branch-based interface, and use GEQ(*,*), CCBR(*,*) and EBR(*,*) directly. But it seems that CCBR(*,*) does not have any effect on the simulation, and only the initial GEQ(*,*) influence the simulation, any later change of GEQ(*,*) does not have any effect. Are there anything else that I should do to use these variables?

2. To use the interpolation directly, it seems that we should use ISW(*), IORV(*,*). I wonder what's the other variable that should be used together, and how to set value for these variables?

Thanks,
Hansen :roll: :roll:

[John Nordstrom]

Hi Hansen,


(1):
I have posted a document under the EMTDC main topic, which describes all there is to know about the GEQ interface - examples included.

[quote:9f19f7ec90]CCBR is calculated by EMTDC each time step depending on the interface settings.[/quote:9f19f7ec90]

(2):
Unfortunately I presently have no documentation on the Interpolation Interface, but I have attached some example Fortran routines that may help.

Regards,

[Anonymous]

Hi, John,

Thanks very much for your quick response. I tried with a simple varying resistor (from 10.Ohm to 5.Ohm at 0.06s) in the sample file t5.psc as attached, it works well. But after I series connected the model with a thyristor which is turned on at 0.033s as shown in t4.psc, my own model does not work. It does not change the conductance at 0.06s. It seems that the initial value of GEQ(*,*) is effective, but the following change has no influence on EMTDC's solution. Could you please help to find out what's the problem?

Thanks very much,
Hansen

[Anonymous]

Hi, John,

In the previous example (t4.psc), the thyristor and the user built model is series connected. When I exchange the position of the thyristor and the user built model, as shown in t9.psc, PSCAD gives the correct results for branch current. However, the results for t4.psc is not correct, although it is straight forward that branch current of t4.psc and t9.psc should be identical.

I'm using PSCAD 4.1.1, is this a bug, or should I change some of the models?

Regards,
Hansen