Dear Mr.Shri,
Thank you very much for your reply. Actually I'm performing ac_opf on model
for total one year. I'm retrieving data of each time hour and perform opf.
For some time hours I'm getting convergence and most of them fails to
converge. It's highly possible that transformers which I modeled as
transmission lines are causing failure in convergence. So, I want to reduce
the branches connected to 110KV buses (220/110 KV and 380/110 KV
transformers). All 110KV buses are load/renewable generation buses. So idea
is to shift the load /generation from 110 KV bus to respective connections
with 220 KV or 380 KV bus so network will be reduce. I think such model
should work at least for those time hour when it was giving success flag 1
before reduction of network. Unfortunately i found two islands and tree
isolated buses with load and generation which I want to add together with
interconnections to get one full system. Full system will reduce from 1086
buses to 753 buses. Which will be more easier to see contingencies in lines
as well. Thank you very much for your time.
Regards
Mirish.
On Thu, Jan 21, 2016 at 7:35 PM, Abhyankar, Shrirang G. <abhy...@anl.gov>
wrote:
> Mirish,
> Before moving further, I would suggest you to review the practicality
> of the assumptions you are making.
> 1) Does it make sense to move the loads, generation to a higher voltage
> level?
> 2) For a utility engineer working on a real system, would he/she add dummy
> branches to make the analysis converge/feasible?
>
> I don't much about the problem you are trying to solve, but I feel, based
> on the description below, that you should first define the problem clearly
> with a set of assumptions conforming reality.
>
> Shri
>
> > On Jan 21, 2016, at 10:48 AM, Mirish Thakur <mirishtha...@gmail.com>
> wrote:
> >
> > Dear all,
> >
> > I'm working on network reduction problem, in which I moved loads,all
> renewable generation and conventional power plants from 110 KV buses to
> respective connected branches (220 KV or 380 KV). I have modeled network
> such that distribution of load or generation will be 50 % if more than one
> branches are connected to 110 KV bus. And after I made branch status 0 of
> the branches which are connected to 110 KV buses. When I checked for
> islands (case_info) in my file I found 2 islands and 336 isolated buses.
> Also I verified it by [group, isolated]=find_island ('myfile'). My question
> is how to get a full system? I found three buses where generation and load
> does exist and are completely isolated and two islands. Also I tried to
> get full system by putting dummy branches to connect isolated buses and a
> small island but i'm not sure how to select branch parameters so that
> problem will be feasible.
> >
> > Thanks and regards
> > Mirish Thakur
>
>
>
