Hello Ray, Thank you so much for your detailed response! Your suggested approach makes total sense, and I will keep an eye out for any case that doesn't satisfy the equal bus voltage base values and get back to you if I find any.
Best regards, Jeffrey ________________________________ From: bounce-126023948-86837...@list.cornell.edu <bounce-126023948-86837...@list.cornell.edu> on behalf of Ray Daniel Zimmerman <r...@cornell.edu> Sent: Monday, October 25, 2021 2:11 PM To: MATPOWER-L <matpowe...@list.cornell.edu> Subject: Re: Parsing Cases Data Not in p.u. or MV/MVAr Hi Jeffrey, Great questions. First a bit of background … if I recall, the reason for specifying some cases in these non-standard ways was that some of the original sources for these cases specified the data in this form, so it was easier to compare the case file with data from the original papers this way. But it really does make it difficult to impossible to parse from other languages. This is the disadvantage of specifying data in M-file form, or for that matter, any form that allows inclusion of anything besides the raw data. To your questions ... 1. Unfortunately, I don’t think you can count on this. I don’t remember the details off the top of my head, but I think there were a few cases included with MATPOWER that have only one of the two non-standard specifications (branch impedances, load values). 2. Hmmm … I see what you mean. And, yes, I think this sort of code requires the assumption that voltage bases for all buses are equal. Let me know if you’ve noticed any for which that is not the case. May I suggest another approach? What about using MATPOWER’s loadcase() and savecase() to do a one-time conversion of all such cases of interest to a “pure data” form, creating an equivalent case file that requires no special handling to read it from another language? That would be much simpler and more robust if it is an option. If access to MATLAB is the issue, you can always use the free, open-source Octave to do it. Hope this helps, Ray On Oct 24, 2021, at 5:21 PM, Liang Chen <liangjie.c...@mail.utoronto.ca<mailto:liangjie.c...@mail.utoronto.ca>> wrote: Hi Everyone, I'm trying to parse some MATPOWER cases in another language, and realized that some cases (e.g., case10ba.m) contain PD, QD data that are in kV/kVAr, and branch impedance in Ohms rather than p.u. I have two questions: 1. Is the "conversion to p.u. and MV/MVAr" process the identical across all such "non-standard" test cases, i.e., can I look for key phrases such as "converted to kW below" when parsing the test case? 2. Should the BASE_KV column in mpc.bus matrix be the same for all such cases? Again, with the case10ba.m example, I noticed that only Bus 1's BASE_KV value is used to convert the branch impedance to p.u. Thanks very much for your help! Jeffrey Chen
