I guess, you need to check the connectivity at every steps since you're doing network reconfiguration.
Though I am not totally sure what you're trying to do, but I guess what you need to check when you do network reconfiguration is you prevent from any loop occurring ( to prevent that you may need to open the sectionalizing switches when you close the tie switches) and you keep aloof from losing the radiality ( I am guessing you're only focusing distribution system where radial type network topology is the most common). On Wed, Apr 10, 2019 at 12:08 PM 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 >>>>>>>>> >>>>>>>>
