I started off with the transmission grid map of Europe from ENTSO-E. I modeled the individual countries based on this map, each in its own case file. After all countries worked by themselves, I brought all buses, generators and branches together into one file (of course making sure, that all IDs and connections are unique and correct). For the "stitching" part, I then went back to the ENTSO-E map and looked, where the actual domestic transmission grids are interconnected in reality (what I called "realistic" in a previous comment). So I have not just connected buses which are in close proximity, but rather really only connected buses which are also physically connected in reality.
But I'd still like to learn more about the phase shifters: How can I find out, where I could use a phase shifter? Or do I rather just "place" phase shifters in series to my tielines, and MATPOWER makes use of them if a shift in phase is needed along the tieline? Best Regards, Patrick ________________________________________ Von: bounce-117292143-69334...@list.cornell.edu [bounce-117292143-69334...@list.cornell.edu]" im Auftrag von "Carlos E Murillo-Sanchez [ce.murillosanc...@gmail.com] Gesendet: Montag, 14. Juli 2014 19:47 An: MATPOWER discussion forum Betreff: Re: AW: Convergence issues: OPF simulation of several interconnected countries Tell me a little more about how you stitched together the different systems. Did you have separate data files for different sections of the system and then you actually interconnected them? What do you mean by "realistic" at this stage? Or did you have one single file with all sections in it? You see, if you have separate data for each section, and then you just try to interconnect them at some points perhaps using geographical vicinity, chances are that the resulting system will have very eschewed flows, perhaps resulting in nonfeasibility. It is not uncommon to have phase shifters along tielines precisely because of this. Carlos. Eser Patrick wrote: > Ray, Carlos, Shri, > > Thanks for your inputs, I really appreciate your help. > > With regard to your responses: > > @Shri: How would I impose the Smin and Smax of the tie-line in the MATPOWER > intput? I can't see anything alike in the mpc.branch struct, as PF, QF, PT > and QT are ignored as inputs according to the manual. Fixing the S-value to > the cross-border flow value would definitely help me! > > @Carlos: No, there are no phase shifters in the system. Would including phase > shifters at crucial points help me? > > @Ray,Shri: I have already cooked the problem down to two countries, so I > totally agree to your boiling-down approach. I will have to look at each line > in detail, but I wanted to make sure first, that I am not making a general > mistake that completely prevents convergence. > > Thanks again!
