I believe treating them as branches is probably the best way in MATPOWER. Then 
you can simply use the BR_STATUS column to indicate whether they are open or 
closed. You’ll have to keep a separate list of which branches are ties. If it 
is convenient, you could put a list of the branch row indices of the ties in 
your own custom field in mpc.

Regards,

     Ray


On Sep 13, 2022, at 11:33 PM, Jessica Korkmaz 
<[email protected]<mailto:[email protected]>> wrote:

Dear all,
I am working on the placement of distributed generators into a 69 bus radial 
distribution system.
The network I am working on contains normally open ties. I was entering the 
information concerning these ties as branches in the case file.
Is there a way to specify that these branches are ties or manually create ties?
I would be glad if I can get some help on this issue.

Best Regards,
Jessica


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