Dear Ray,
I work with integration of renewable energy in conventional
systems. I have a doubt regarding reconfiguration of network. Adding a
renewable generator to a system as load (by negative load concept) is what
I have done. Does this related to reconfiguration. Or else what
I guess the question is, what do you mean by “reconfiguration”. I’m used to
thinking of it with regard to network switching in largely radial distribution
networks. If that is what you mean, then it simply involves changing the
BR_STATUS column of the branches of interest in the branch matrix
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
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
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 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
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 Tekno
Dear Carlos A. Castro,
Thank you before. I've done the replacement and the buses are all correct,
because I draw the single line diagram first and then input the data in
Matlab. Is there any other solution?
*Best Regards,*
*Putu Diah Nitya Kirana,*
Assistant and Researcher at Electric Energy Con
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
wrote:
> Dear Fiaz Ahmad,
>
>
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 you
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 <
nityakirana...@gmail.com> έγραψε:
> Dear Fiaz Ahmad,
>
> I actually have run the simulation for I
Dear Ilias Sarantakos,
I didn't find Matpower 6.1 and I downloaded the 6.0 version instead. When I
run the program, it still doesn't converge. I don't know if the problem is
in my SPSO or in my Newton Raphson Method. Here I attach my coding, can you
run it for me? Thank you. I really need help fo
result …
==
SIMULATION RESULTS OF 64 BUS DISTRIBUTION NETWORK
***
==
BEFORE RECONFIGURATION AFTER RECONFIGU
RESULTS OF 64 BUS DISTRIBUTION NETWORK
> ***
>
> ==
> BEFORE RECONFIGURATION AFTER
> RECONFIGURATION
>
> --
> Tie s
===
> SIMULATION RESULTS OF 64 BUS DISTRIBUTION NETWORK
> ***
> ======
>BEFORE RECONFIGURATION AFTER
> RECONFIGURATION
> --
***
==
BEFORE RECONFIGURATION AFTER
RECONFIGURATION
--
Tie switches: 62 63 64 65 66
For radial distribution systems, you can use the fixed point iterative
technique. OpenDSS is an open source distribution solver which can handle
unbalanced networks.
Thanks
-Aaqib
On Tue, Apr 9, 2019 at 07:54 Fiaz Ahmad wrote:
> Dear Nitya use forward-backward sweep algorithm for the power flow
0.000
0.00
64 11 62 0.00 0.00 0.00 0.00 0.000
0.00
65 30 63 0.00 0.00 0.00 0.00 0.000
0.00
66 39 64 0.00 0.00 0.00 0.00 0.000
0.00
----
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 a
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, Ap
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 th
Dear Jubeyer Rahman,
I just check the connectivity and this is the result :
Checking connectivity ... single fully connected network
Elapsed time is 9.57 seconds.
Full
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
wrote:
> Dear Jubeyer Rahman,
>
> I just check the connectivity and this is the result :
>
>
>
>
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 swi
Dear Jubeyer Rahman,
Yes you are right, I'm using SPSO to find the tie switches with the goals
of reducing power losses and using the Newton Raphson method to analyze the
power flow. But, I actually don't know how to check it for every iteration,
please mind to help me.
*Best Regards,*
*Putu Dia
I guess, that's what Dr. Zimmerman has already described. You can follow
that. But the goal you want to achieve will not be fulfilled just by
checking. What you need to do, you need to put some constraints which will
deter the loop and islanding to happen. There might be literature
describing them,
gt;
>>> Would you please send me de data file (.m)? I'll try to run it here.
>>>
>>> -- Forwarded message -
>>> De: Nitya Kirana
>>> Date: ter, 9 de abr de 2019 às 01:53
>>> Subject: Re: Network Reconfiguration
>>&
er
>> Surabaya, Indonesia
>>
>> +62 8170 3178 248
>>
>>
>>
>> On Tue, 9 Apr 2019 at 23:39, Carlos A. Castro wrote:
>>
>>> Would you please send me de data file (.m)? I'll try to run it here.
>>>
>>> -- Forwarded mes
m, please run it more than once, because the result will be
> different for every run, thank you.
> Best Regards,
>
> Putu Diah Nitya Kirana,
> Assistant and Researcher at Electric Energy Conversion Laboratory B101
> Electrical Engineering Department
> Faculty of Electrical Tec
for Reconfiguration/Restoration process, ie:
Occurrence of significant concentration of buses/Loads in a given healthy
region (region that will receive some or all of the disconnected Loads)
Of the feeder (as shown below) via the relocation of disconnected loads
(optimization process) due to the
If you haven’t tried it, certainly try increasing the number of iterations for
the radial methods.
Ray
> On Jul 3, 2017, at 3:15 PM, Andrey Vieira wrote:
>
> for Reconfiguration/Restoration process, ie:
>
> Occurrence of significant concentration of buses/Loads in
julho de 2017 19:56
Para: MATPOWER discussion forum
Assunto: Re: Non-Convergence of Load Flow in Reconfiguration / Restoration
Situations (via Optimization)
If you haven’t tried it, certainly try increasing the number of iterations for
the radial methods.
Ray
On Jul 3, 2017, at 3:15 PM, Andrey
of
> iterations for the radial methods.
>
>
>Ray
>
> > On Jul 3, 2017, at 3:15 PM, Andrey Vieira
> > wrote:
> >
> > for Reconfiguration/Restoration process, ie:
> >
> > Occurrence of significant concentration of buses/Loads in a given hea
ions should
> I make the change in the number of iterations?
>
>
>
>
> De: bounce-121637368-77188...@list.cornell.edu
> em nome de Ray Zimmerman
>
> Enviado: segunda-feira, 3 de julho de 2017 19:56
> Para: MATPOWER discussion forum
> Assunto: Re: Non
Now I get it. I'll do change. Thanks!!
De: bounce-121639335-77188...@list.cornell.edu
em nome de Ray Zimmerman
Enviado: quarta-feira, 5 de julho de 2017 12:45
Para: MATPOWER discussion forum
Assunto: Re: Non-Convergence of Load Flow in Reconfigur
in Reconfiguration / Restoration
Situations (via Optimization)
I would suggest that you try to use the option for setting
exp.sys_wide_zip_loads.pw. If you model all loads as constant
admittances by using pw = [0 0 1] you will certainly get a solution with
YSUM since in this case the network is
> De: bounce-121637485-77188...@list.cornell.edu
> em nome de Mirko
> Todorovski
> Enviado: segunda-feira, 3 de julho de 2017 21:24
> Para: MATPOWER discussion forum
> Assunto: Re: Non-Convergence of Load Flow in Reconfiguration
Reconfiguration / Restoration
Situations (via Optimization)
You don't have to change the code, just use mpoption as in the following
example
>> opt = mpoption('pf.alg','YSUM','exp.sys_wide_zip_loads.pw',[0 0 1]);
>> runpf('case18',opt)
Best regards
Dear all and Mr Ray
I am developing optimization studies (evolutionary algorithms) in
reconfiguration and restoration in distribution systems in the first part of my
thesis. For this, I'm basically using MATPOWER's runpf function for cases 33,
84 and 135 buses to analyze losses, vol
:bounce-121270305-77019...@list.cornell.edu] Im Auftrag von Andrey
Vieira
Gesendet: Donnerstag, 23. Februar 2017 22:02
An: MATPOWER-L@cornell.edu; r...@cornell.edu; matpowe...@list.cornell.edu
Betreff: Fault and Protection analysis for reconfiguration and restoration
of the Radial distribution feeders
Dea
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