Re: 69 bus distribution system

[小柳拓也]

I crossed check the value of R and X which I enter with respect to 
reference journal many times.
But obtained result was not correct.
So, to confirm whether a making process is right, I also make 16 and 33 
bus system by the same process.
But these results of power loss also were not correct. 16 bus system don
't even converge.
I cross check the value many times.
I think that in my process there is fatal mistake.
What is problem?

I describe below making bus system process. Is there the error?

1. change mpc.baseMVA
2. change number of bus and branch
3. chnage bus data(Pd, Qd, Gs, Bs, Vm, Va, baseKV, Vmax, Vmin)
4. change generator data (Pg, Qg, Qmax. Qmin, Vg, mBase, Pmax , Pmin)
5. change branch data(r, x, b).
r, x, b are [p.u.] ohm*(baseKV)^2/baseMVA

I attach bus systems and reference jounal paper.

Takuya Koyanagi
x0t1...@students.chiba-u.jp

----- Original Message -----
> Hi Takuya,
> I don't think the problem is with Matpower. Cross Check the values of 
R and X to make sure the values you entered are correct with respect to 
your reference journal. 
> Regards
> Idris
> 
> ________________________________________
> From: bounce-107942339-12781...@list.cornell.edu [bounce-107942339-
12781...@list.cornell.edu] on behalf of 小柳拓也 [x0t1532@students.chiba
-u.jp]
> Sent: Friday, September 13, 2013 7:32 AM
> To: MATPOWER discussion forum
> Subject: Re: 69 bus distribution system
> 
> For now, 69 bus system which I made is converged to operate runpf.
> Idris's advice is correct. Thanks to your advice.
> I attach 69 bus system which I modified.
> 
> In comparison with journal I read, it is described 0.226MW loss and 0.
> 104MVAR loss.
> But my result are 0.264MW loss and 0.11MVAR loss.
> What is a cause?
> 
> I think truncation error occurs. Because matpower treat MW and MVAR 
case,
>  but 69 bus system treat KW and KVAR case, so values of load, loss, 
and
> so on become too small.
> 
> What should I do?
> 
> 
> Takuya Koyanagi
> x0t1...@students.chiba-u.jp
> 
> 
> ----- Original Message -----
> > Thanks for reply, Idris.
> > I'm sorry for replying to be late.
> >
> > Today, I'll try column 3 and 4.
> >
> > Before trying these, is base MVA 0.01MVA?
> > In journal which I read, here is base KVA = 10KVA, so I rewrite 0.
> 01MVA.
> >
> > After trying clumun 3,4 ,I report to you.
> >
> >
> > Takauya Koyanagi
> > x0t1...@students.chiba-u.jp
> >
> > ----- Original Message -----
> > > Hi Takuya,
> > > Your power did not converged because the line parameters (R and X)
> you
> > entered in column 3 and 4 of the branch matrix (mpc.branch) are in
> ohms
> > instead of p.u.
> > >
> > > Solution:
> > > 1. Select the right base MVA; 10MVA for an example
> > > 2. the operating voltage of the network is 12.66KV. this should be
> > your base KV
> > > 3. Calculate the your base impedance based on 1 & 2 above
> > > 4. compute the equivalent per unit impedances for the R and X in
> > column 3 and 4 respectively
> > > Then run your load flow again. It should converge.
> > > On the alternative, add the expression below before the bus matrix 
(
> > mpc.bus)
> > >
> > > mpc.baseMVA = 10;
> > > mpc.baseKVA = 12.66;
> > > Baseimpedance=(mpc.baseKVA)^2/mpc.baseMVA;
> > >
> > > Then after the branch matrix (mpc.branch) add
> > >
> > > mpc.branch(:,3:4)=mpc.branch(:,3:4)/Baseimpedance;
> > >
> > > Then run your load flow again. It should converge.
> > >
> > > Idris
> > > >-----Original Message-----
> > > >From: bounce-107937414-12781...@list.cornell.edu [mailto:bounce-
> > > >107937414-12781...@list.cornell.edu] On Behalf Of ????
> > > >Sent: 12 September 2013 11:02
> > > >To: MATPOWER-L@cornell.edu
> > > >Subject: 69 bus distribution system
> > > >
> > > >I want 69 bus distribution system, so I make that.
> > > >
> > > >I collect 69 bus distribution datas. I referred to journal of
> > attachment.
> > > >
> > > >I modify 'case_ieee30', and input branch and bus datas of 69 bus
> > > >distribution system.
> > > >
> > > >After makeing 69 distribution system, I implement 'runpf'. But '
> runpf
> > '
> > > >didn't converged.
> > > >
> > > >I attach 69 distribution system which I made. What is wrong?
> > > >
> > > >If 69 distribution system will be completed, let's use it 
together.
> > > >
> > > >So I want advise. Please lend me your strength.
> > > >
> > > >Takuya Koyanagi
> > > >x0t1...@students.chiba-u.jp
> > >
> > >
> > >
> >
> >
> >
> >
> 
> 
> 

case_radial16.m
Description: Binary data

case_radial33.m
Description: Binary data

case_radial69.m
Description: Binary data

16bus.pdf
Description: Adobe PDF document

33bus.pdf
Description: Adobe PDF document

69bus.pdf
Description: Adobe PDF document