Hi Surbhi,
Could you please check the continuity of the system before running opf? I
mean to say if you run opf for (n-1) criteria the system should be still
well connected. There shouldn't be any island within the system itself.
Perhaps you can test your model by removing any one parallel line (w
.html>. If
>> there are islands, then each island needs to have its own reference bus,
>> and the local generation needs to be able to meet the local load in each
>> island.
>>
>> Ray
>>
>>
>> On Sep 9, 2020, at 4:57 AM, Mirish Thakur wrote:
&
t;>>> Regards
>>>> Surbhi Aggarwal
>>>>
>>>>
>>>> On Fri, Sep 11, 2020 at 7:16 PM Ray Daniel Zimmerman
>>>> wrote:
>>>>
>>>>> Hi Surbhi,
>>>>>
>>>>> It looks like you were
Hi,
Why don't you use the* "runopf"* command then? It serves your purpose of
enforcing the limits which you want.
Thanks
Mirish
On Sat, Mar 11, 2023 at 11:09 PM Muhammad Nadeem wrote:
> Hello all,
>
> Is there a way to enforce generation limits, branch flow limits, and
> voltage magnitude limits
Dear Prof. R. Zimmerman,
I'm master student working on a project dealing with power system
optimization with additional variables 'tap ratio' and 'shift' on 9 bus
system by *mipsopf_solver*. I have made necessary changes in respective
function files. Also I concern with only current flow constr
? But facing the
problem in opf_args.
Thanks .
Mirish
On Fri, Jan 9, 2015 at 3:05 PM, Abhyankar, Shrirang G.
wrote:
> Are you setting the solution vector (x) size and the indexing
> information for extracting the elements from it correctly?
>
> On Jan 8, 2015, at 4:50 AM, "Mi
fcn by extracting Pg, and
> Qg from the solution vector x. You need to do something similar with Ybus.
>
> Shri
>
> From: Mirish Thakur
> Reply-To: MATPOWER discussion forum
> Date: Wed, 14 Jan 2015 00:12:16 +0100
> To: MATPOWER discussion forum
> Subject: R
rder: [1x1 struct]
et: 0.2320
success: 0
I will be very thankful for your help.
Regards
Mirish Thakur.
KIT, University.
cat(transmission_lines,grid_transformer)
which is similar to matpower test cases.). So could you please suggest me
what necessary steps I should follow?
Thank you for your time.
Regards
Mirish Thakur
KIT, University.
On Mon, Aug 10, 2015 at 7:14 PM, Abhyankar, Shrirang G.
wrote:
> I would sugge
quot;. Get a healthy backbone first, and then you
> can start transporting real power.
>
> Hope it helps,
>
> --
> Jose L. Marin
> Gridquant España SL
> Grupo AIA
>
>
> On Wed, Aug 12, 2015 at 2:36 AM, Mirish Thakur
> wrote:
>
>> Dear Mr.Shree,
&g
parameters or something else).
Thank you for your time.
Regards
Mirish Thakur
KIT University.
On Thu, Sep 17, 2015 at 9:27 PM, Ray Zimmerman wrote:
> Yes, thanks, Jose. I’ve added another item to FAQ #5 with links to your
> posts.
>
>Ray
>
>
>
> On Aug 16, 2015
gular relationship between active and reactive power approach 2)
opportunity cost method. Thanks for your time.
Mirish Thakur
KIT University.
On Tue, Sep 22, 2015 at 3:20 AM, vids wrote:
> Hi Mirish,
>
> I just finished my work that is somewhat related to yours. I did a
> reactive power disp
Thank you very much Prof. Ray.
Regards
Mirish
On Fri, Sep 25, 2015 at 7:37 PM, Ray Zimmerman wrote:
> You might have a look at Markets for Reactive Power and Reliability: A
> White Paper <http://e3rg.pserc.cornell.edu/node/100>.
>
>Ray
>
>
>
> On Sep 24, 2
.
Regards
Mirish Thakur
KIT University
.
Regards
Mirish Thakur
On Mon, Nov 30, 2015 at 5:54 PM, Ray Zimmerman wrote:
> Hi Mirish,
>
> There is no way to see the load or renewable curtailment until you get a
> converging OPF. It is possible that you will also have to redispatch the
> conventional generators in order to
gards
Mirish Thakur
On Wed, Dec 2, 2015 at 6:02 PM, Ray Zimmerman wrote:
> 1) It looks like you are setting up gencost correctly. The negative
> objective function value results from the fact that the curtailable loads
> are being modeled as negative generation, with negative c
Hello Matpower friends,
I have a question over similar sign of flows at both nodes of a branch. I
have performed PF with PG=0, PD=0 BRANCH_R=0; means total reactive power
model (reactive power generation and reactive demand exist) and I got
successful convergence. When I observed reactive power
ct, since I only work
> on power grids for 5 months now.
>
> P.S.: Next time please also include the 'from' and 'to' bus entry. That
> would make it easier for me to give you a practical example.
>
> Best regards
> Dirk
>
>
>
> On 28.02.2016 02:36,
Hello Juliane,
If you don't know reactive power capability curve then you can approximate
by 0.90, 0.95 rule for synchronous generator. By which Qmax is computed by
P=Pmax and 0.9 pf lagging. And Qmin is computed by P=Pmax and 0.95 pf
leading. Therefore Qmax=Pmax * tan (cos^(-1)(0.9)) and Qmin= -
also extends to reactive powers.
>
> You have to be careful though: In the pretty printed output of the runpf()
> method, the branch losses are *only *the series element losses (I^2 * Z).
> That might cause some confusion.
>
>
> I hope this helps and i hope my statements are c
the
>> conservation of energy fortunately also extends to reactive powers.
>>
>> You have to be careful though: In the pretty printed output of the
>> runpf() method, the branch losses are *only *the series element losses
>> (I^2 * Z). That might cause some confusion.
>
Hello Mounika,
If I'm not wrong are you interested in this one -
mpc=case_ieee30; % load case_ieee30
mpc1=load2disp(mpc); % make all loads dispatchable
r=runopf(mpc1); % perform opf operation on mpc1 casefile.
You can observe all loads are modeled as negative generators in mpc1.gen
matrix.
In r.ge
derstand why this happens. I
> really do appreciate your help. Thank you for your time.
>
>
> Thanks and regards
>
> Mirish Thakur.
>
> On Wed, Dec 2, 2015 at 6:19 PM, Mirish Thakur
> wrote:
>
>> Dear Prof. Ray,
>>
>> Thanks a lot for clarifying my
irish Thakur.
On Wed, Dec 2, 2015 at 6:19 PM, Mirish Thakur
wrote:
> Dear Prof. Ray,
>
> Thanks a lot for clarifying my doubts. Actually I forgot to see that loads
> are modeled as negative generator, instead I was focusing on energy prices
> only. And in second one I didn't ela
t; branches to make the analysis converge/feasible?
>
> I don't much about the problem you are trying to solve, but I feel, based
> on the description below, that you should first define the problem clearly
> with a set of assumptions conforming reality.
>
> Shri
>
> &g
ters so that
problem will be feasible.
Thanks and regards
Mirish Thakur
tor costs in the system, which
> can legitimately happen.
>
>Ray
>
>
> On Mar 11, 2016, at 9:54 AM, Mirish Thakur wrote:
>
> Dear Prof. Ray,
>
> With reference to the same thread, I want to clear one doubt.
> I have imposed reactive power cost on conventional gene
Dear Prof. Ray,
I have modeled capability curve in triangular shape. Ex. P1=0, P2= 10 MW,
Qmax =4.84, Qmin =-3.28, Pmax=Pmin=9.5. So at this Pmax limit generator
should produce reactive power =0.24 MVAr but in opf it generates 4.60 MVAr.
I don't understand the reason because I have fixed the acti
MW would be -3.28 to +4.84 MVAr … at 9.5 MW it would
> be 0.95 times those numbers, i.e. -3.12 to +4.60 MVAr.
>
> Which is what you see.
>
> Ray
>
>
>
>
> On Apr 6, 2016, at 11:16 AM, Mirish Thakur wrote:
>
> Dear Prof. Ray,
>
> I have modeled capability
Hello Fiaz,
If you want to perform OPF then you have to put limits on active and
reactive power generation; i.e. Pmax, Pmin, Qmax Qmin in generator matrix
column. Just try to format your case according to any sample case;e.g.
case9. You can get additional information from manual in the Table B-1 t
should just put a fictitious
> generator at
> the substation bus and declare it a slack bus.
>
> Jovan
>
> On Thu, May 5, 2016 at 8:05 AM, Mirish Thakur
> wrote:
>
>> Hello Fiaz,
>>
>> If you want to perform OPF then you have to put limits on active and
>&g
When you perform opf operation on your casefile then see the column no. 14
and 15 of bus matrix, you will see the lambda values for both active and
reactive power. e.g. res=runopf(case30) then see the *res.bus* matrix.
regards
Mirish
On Wed, Jun 29, 2016 at 9:33 AM, Priyanka Shinde <
priyanka.shi
Probably it is due to matrix dimension mismatch. Look carefully the data
for two more buses which you are inserting to the existing 9 bus system.
Size of new data should have the same size of existing one.
Regards
Mirish
On Tue, Jul 5, 2016 at 8:49 PM, Priyanka Shinde <
priyanka.shinde.1...@gmail.
One possible method to connect SVC is, connect it as a generator with no
active power but reactive power injector to controls voltage of a node.
Regards
Mirish
On Fri, Jul 15, 2016 at 10:24 AM, anshu dahiya
wrote:
> sir say something about my question that was how to connect SVC in the ckt?
>
>
Hello Mohammed,
If you want to run OPF for 24 hours then you need to have 24 cases (if
topology of grid changes). Set a for loop for 24 hours in such a way that
in each hour an individual MPC case will be build and OPF will be performed
for each hour.
This is a simple way I could suggest you acco
Hello,
You can set the renewable source as an active power generation source in
generator matrix use PG column to set its maximum power output as Pmax and
if it can not generate reactive power then treat that bus as PQ bus
by numbering it '2' in bus matrix or in other way you can use it (same
gene
Hi,
I would recommend you to go through these 8 steps (Incremental approach)
suggested by Jose L. Marin. Click the link given below and follow the
steps. When I was working with the German Grid I had same problems but
these steps really worked out in my case. I hope you will get solution.
*https:
Hello all,
I have a small question regarding to parallel lines.
I want to make one single line from two parallel lines.
These are line parameters:
R XB Rate_A_ MVA
0.682443.283940.143503462.3
0.651464 3.138740
Hello all,
I've very simple question, does rundcopf() gives iterative solution? If yes
then how can I check after how many iterations does solution converged? I
checked res=rundcopf(), and res.iterations, but no success. Thank you for
your time.
regards
Mirish
Hi Hasan,
I would say, just relax the limits of rest of the buses from bus matrix in
case9.m file and keep ( 0.9 and 1.1) for 5 to 8.
Thanks
Mirish
On Fri, Jan 18, 2019 at 10:19 PM Meraj Fouad wrote:
> Hi ,
> How are you all doing?
>
> I am using "runopf" in MATPOWER. But I want MATPOWER to
you mean by relaxing?
> Best regards
>
> On Fri, Jan 18, 2019 at 4:53 PM Mirish Thakur
> wrote:
>
>> Hi Hasan,
>>
>> I would say, just relax the limits of rest of the buses from bus matrix
>> in case9.m file and keep ( 0.9 and 1.1) for 5 to 8.
>>
>&
Didn't understand your question. If I'm correct then you're performing
simple power flow on your case. In this case solver doesn't consider any
restriction/ constraints on problem, means, No branch limits No voltage
limits are applicable . If you want to impose any voltage limits on system
then yo
Rate-A is thermal capacity of transmission line in MVA. You can get more
information in manual, go to the branch information table if I'm correct.
On Mon, 11 Feb 2019, 3:36 p.m. amir ali Hosseini Dear Sir,
> hi
> i doing make a nwe network with 37 node but i don't know how do they get
> their va
Hi Shiva,
Bus indices 1, 2, 3 have generator connected and 5, 7 and 9 load connected
and dash (-) means no generation no injection. Thanks.
Regards
Mirish
On Fri, Oct 12, 2018 at 4:30 PM Shiva Moshtagh
wrote:
> Hello
> I am not a power student and I have a question about power flow.
> when I r
I would recommend you to model it as a synchronous generator without active
power. So, it will have only Qmax and Qmin in generator matrix. See the
link below.
https://www.power-eng.com/articles/print/volume-115/issue-10/features/converting-existing-synchronous-generators-into-synchronous-condenser
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