If I understand it correctly, you're running some particle swarm optimization to find the best combination of tie switch states (or network configuration) which will minimize your line loss. So, when particle swarm optimization tries to change the value of the particles (may be the state of tie switches), not every random combination will give you a feasible solution. Let me know if I have got this right or not.
On Wed, Apr 10, 2019 at 12:27 PM Jubeyer Rahman <[email protected]> wrote: > No, What I have said is, you need to check at every step of your > iteration. Since you're opening some tie switches, that may result in > islands sometimes. > > On Wed, Apr 10, 2019 at 12:19 PM Nitya Kirana <[email protected]> > wrote: > >> Dear Jubeyer Rahman, >> >> I just check the connectivity and this is the result : >> >> >> >> Checking connectivity ... single fully connected network >> Elapsed time is 9.566667 seconds. >> >> ================================================================================ >> Full >> System >> Number of: ---------- >> buses 64 >> loads 58 >> on 58 >> off - >> fixed 58 >> dispatchable - >> on - >> off - >> generators 3 >> on 3 >> off - >> shunt elements - >> branches 66 >> on 66 >> off - >> ties (off) - >> >> Load >> active (MW) >> dispatched 25.4 >> fixed 25.4 >> dispatchable - >> nominal 25.4 >> on 25.4 >> off - >> fixed 25.4 >> dispatchable - >> on - >> off - >> reactive (MVAr) >> dispatched 29.1 >> fixed 29.1 >> dispatchable - >> nominal 29.1 >> on 29.1 >> off - >> fixed 29.1 >> dispatchable - >> on - >> off - >> >> Generation >> active (MW) >> dispatched - >> max capacity - >> on - >> off - >> min capacity - >> on - >> off - >> reactive (MVAr) >> dispatched - >> max capacity - >> on - >> off - >> min capacity - >> on - >> off - >> >> Shunt Injections >> active (MW) - >> reactive (MVAr) - >> >> Branch Losses >> active (MW) - >> reactive (MVAr) - >> >> DC line >> export (MW) >> dispatch - >> max capacity - >> on - >> off - >> min capacity - >> on - >> off - >> >> Reference Buses >> num of ref buses 3 >> ref bus numbers 1 >> 2 >> 3 >> >> Is there any wrong with this? because I think everything is fully >> connected. >> *Best Regards,* >> >> *Putu Diah Nitya Kirana,* >> >> Assistant and Researcher at Electric Energy Conversion Laboratory B101 >> Electrical Engineering Department >> Faculty of Electrical Technology >> Institut Teknologi Sepuluh Nopember >> Surabaya, Indonesia >> >> +62 8170 3178 248 >> >> >> >> On Thu, 11 Apr 2019 at 00:09, Jubeyer Rahman <[email protected]> wrote: >> >>> Hi, >>> As per the suggestion of Dr. Zimmerman, check the connectivity of the >>> system by using: >>> >>> case_info('your case') >>> >>> As Ray said, you have isolation in your system, this kind of system >>> usually don't converge if you don't assign different swing generators for >>> different islands. >>> >>> -Jubeyer >>> >>> >>> On Wed, Apr 10, 2019 at 11:37 AM Nitya Kirana <[email protected]> >>> wrote: >>> >>>> Dear all, >>>> >>>> Hi, sorry for contacting again, I just make the P and Q loads of the >>>> bus 10 times bigger because I put the data wrong at first, but it can not >>>> run and I don't know why. Can anyone help me? thank you. Here I attach my >>>> program again. >>>> *Best Regards,* >>>> >>>> *Putu Diah Nitya Kirana,* >>>> >>>> Assistant and Researcher at Electric Energy Conversion Laboratory B101 >>>> Electrical Engineering Department >>>> Faculty of Electrical Technology >>>> Institut Teknologi Sepuluh Nopember >>>> Surabaya, Indonesia >>>> >>>> +62 8170 3178 248 >>>> >>>> >>>> >>>> On Tue, 9 Apr 2019 at 17:49, Ilias Sarantakos <[email protected]> >>>> wrote: >>>> >>>>> Hi Nitya, >>>>> >>>>> I tried your network and it converged; I am using MATPOWER 6.1. >>>>> >>>>> Kind regards, >>>>> >>>>> Ilias Sarantakos >>>>> PhD Student >>>>> Newcastle University >>>>> UK >>>>> >>>>> Στις Τρί, 9 Απρ 2019 στις 9:19 π.μ., ο/η Nitya Kirana < >>>>> [email protected]> έγραψε: >>>>> >>>>>> Dear Fiaz Ahmad, >>>>>> >>>>>> I actually have run the simulation for IEEE 33 bus, 16 bus, and 69 >>>>>> bus using Newton Raphson method and the result is convergen. And also in >>>>>> IEEE 33 bus it has the ratio R/X greater than mine, so I just think that >>>>>> the problem is not the Newton Raphson method. Anw, thank you for your >>>>>> recommendation. >>>>>> >>>>>> >>>>>> *Best Regards, * >>>>>> >>>>>> *Putu Diah Nitya Kirana,* >>>>>> >>>>>> Assistant and Researcher at Electric Energy Conversion Laboratory B101 >>>>>> Electrical Engineering Department >>>>>> Faculty of Electrical Technology >>>>>> Institut Teknologi Sepuluh Nopember >>>>>> Surabaya, Indonesia >>>>>> >>>>>> +62 8170 3178 248 >>>>>> >>>>>> >>>>>> >>>>>> On Tue, 9 Apr 2019 at 11:54, Fiaz Ahmad <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> Dear Nitya use forward-backward sweep algorithm for the power flow >>>>>>> of this system. >>>>>>> >>>>>>> >>>>>>> Have a nice day >>>>>>> >>>>>>> Regards, >>>>>>> DR. FIAZ AHMAD >>>>>>> PhD Mechatronics Engineering (Sabanci University, Istanbul Turkey), >>>>>>> Mob: 0092-332-9124525, >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Tue, Apr 9, 2019 at 9:51 AM Nitya Kirana < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> Dear Fiaz Ahmad, >>>>>>>> >>>>>>>> Okay thank you, so what's your recommendation for this power system >>>>>>>> analysis method? >>>>>>>> *Best Regards,* >>>>>>>> >>>>>>>> *Putu Diah Nitya Kirana,* >>>>>>>> >>>>>>>> Assistant and Researcher at Electric Energy Conversion Laboratory >>>>>>>> B101 >>>>>>>> Electrical Engineering Department >>>>>>>> Faculty of Electrical Technology >>>>>>>> Institut Teknologi Sepuluh Nopember >>>>>>>> Surabaya, Indonesia >>>>>>>> >>>>>>>> +62 8170 3178 248 >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Tue, 9 Apr 2019 at 01:04, Fiaz Ahmad <[email protected]> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Normally Newton Raphson method doesn't converge for distribution >>>>>>>>> systems due to high r/x ratios >>>>>>>>> >>>>>>>>> On Mon, Apr 8, 2019, 22:48 Carlos A. Castro <[email protected]> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Dear Nitya >>>>>>>>>> >>>>>>>>>> I would do two things: >>>>>>>>>> >>>>>>>>>> 1. I would replace all commas "," by points "." in the data file. >>>>>>>>>> >>>>>>>>>> 2. I would try to draw the one line diagram of the network based >>>>>>>>>> on the data, to check whether the network is all connected, that is, >>>>>>>>>> that >>>>>>>>>> there are no isolated buses or group of buses, >>>>>>>>>> >>>>>>>>>> Good luck, >>>>>>>>>> >>>>>>>>>> Carlos >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Em seg, 8 de abr de 2019 às 14:42, Nitya Kirana < >>>>>>>>>> [email protected]> escreveu: >>>>>>>>>> >>>>>>>>>>> Dear all, >>>>>>>>>>> >>>>>>>>>>> I have run the power flow of 64 radial test bus system using >>>>>>>>>>> Newton Raphson in Matpower 4.1. It shows the result of power >>>>>>>>>>> losses but it doesn't converge, whenever I run the matlab, the >>>>>>>>>>> result is >>>>>>>>>>> always different, and I don't know what's the problem. Can anyone >>>>>>>>>>> help me? >>>>>>>>>>> because this is my final project. It shows "Warning: Matrix is >>>>>>>>>>> singular to working precision." >>>>>>>>>>> >>>>>>>>>>> So, here is my data : >>>>>>>>>>> >>>>>>>>>>> bus data >>>>>>>>>>> bus type Pd Qd >>>>>>>>>>> Gs Bs area Vm Va baseKV zone Vmax >>>>>>>>>>> Vmin >>>>>>>>>>> 1 3 0 0 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 2 3 0 0 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 3 3 0 0 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 4 1 0,0136 0,016256 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 5 1 0,0204 0,024384 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 6 1 0 0 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 7 1 0,07684 0,091846 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 8 1 0,02856 0,034138 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 9 1 0,03808 0,045517 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 10 1 0,0238 0,028448 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 11 1 0,01768 0,021133 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 12 1 0,017 0,02032 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 13 1 0,022304 0,02666 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 14 1 0,0204 0,002438 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 15 1 0,05848 0,069901 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 16 1 0,26384 0,315366 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 17 1 0,03774 0,04511 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 18 1 0,0204 0,002438 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 19 1 0,05576 0,06665 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 20 1 0,0136 0,016256 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 21 1 0,0306 0,016256 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 22 1 0,0204 0,024384 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 23 1 0,0272 0,032512 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 24 1 0,11764 0,140614 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 25 1 0,0068 0,008128 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 26 1 0,0136 0,016256 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 27 1 0,0238 0,028448 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 28 1 0,112948 0,135006 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 29 1 0,02176 0,02601 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 30 1 0 0 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 31 1 0,01768 0,021133 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 32 1 0,05168 0,061773 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 33 1 0,03468 0,041453 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 34 1 0,02856 0,034138 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 35 1 0,0272 0,032512 0 0 1 1 0 20 1 1 0,9 >>>>>>>>>>> 36 1 0,01768 0,021133</fon >>>>>>>>>>> >>>>>>>>>>
