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MATPOWER / matpower

MATPOWER – steady state power flow simulation and optimization for MATLAB and Octave
https://matpower.org
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Put default tap ratio (=1) to documentation #17

Closed 8986ca6c closed 7 years ago

8986ca6c commented 7 years ago

As one can see in makeYbus.m there is a default tap ratio equation, used when its value is 0. This appears quite often in case5, case9, case14... (I suppose there are even more examples, but I think three are enough). Whithout knowing about the default bahavior, these cases seem to be very weird, as equation in many branches (assuming r=x=b=0 for cases of simplicity to show this weird ratio).

There is no hint on this default tap ratio in the documentation. This led me to spend (waste?) time on understanding, why the above mentioned cases actually work.

I'd be thankful if you could add this information to the ducumentation, e.g. in Table B-3: Branch Data. Think this could help others too. Thank you.

rdzman commented 7 years ago

You are right. The only indication was in caseformat where it says ( = 0 for lines ).

Sorry for the confusion. I have added clarification to both Table B-3 and the description in caseformat, as well as adding a footnote in Section 3.2.

Note the manual updates currently are only in the LaTeX source, not the PDF. So I've attached an updated PDF below.