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: [email protected] [[email protected]] on behalf of 小柳拓也 [[email protected]] 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 [email protected] ----- 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 > [email protected] > > ----- 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: [email protected] [mailto:bounce- > > >[email protected]] On Behalf Of ???? > > >Sent: 12 September 2013 11:02 > > >To: [email protected] > > >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 > > >[email protected] > > > > > > > > > >
