Thanks for bringing this to our attention. Unfortunately, I’m not very familiar 
with that code, since I didn’t write it. Can you create a minimal reproducible 
example<https://stackoverflow.com/help/minimal-reproducible-example> that can 
be used to duplicate the problem? If so, would you mind creating a bug report 
in the mx-reduction issue 
tracker<https://github.com/MATPOWER/mx-reduction/issues> and attaching the 
files for the example? With that, maybe I can get the original author to have a 
look (no promises).

    Ray

On Mar 27, 2020, at 8:24 PM, yangyang 
<980182...@qq.com<mailto:980182...@qq.com>> wrote:

Dear all,
I am using MPReduction() in the extras folder to implement power network 
equivalence. But the power flow will report error sometimes, because the 
indices of the  generators will not be arranged in the reduced network. Say, in 
the original case a generator is at bus 100, but after reduction there are only 
90 buses and the index of the generator will not be rearranged. Is there any 
way to fix it? It seems that ext2int() cannot fix the bug. Thank you all.


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