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
>>>>>>>>
>>>>>>>
