I have a doubt regarding the LMPs in an IEEE-14 bus system.In 14 bus system
there are no loads at 7th and 8th buses but there is LMP value which is
equal at both buses. How it is possible.
sir
In IEEE-14 bus system the active power at some buses is zero but there is
reactive power exists.How it is possible
Hi Dear Community,
I have a strange question about OPF.
If I use a solver like fmincon with Interior Point algorithm in MATLAB
optimization toolbox to solve runpf('case30') with objective of loss
minimization (Pgen_total - Pdemand_total ) and considering Pg in all
PV-buses as control
Respected Sir,
I want to execute OPF using AI method. For IEEE 30 bus test system, i want to
reschedule voltage of generator connected at bus 2. so in the program, which
entry should be changed? --Bus(2, VM) or gen(2, VG)?
thanks in advance
Hello all,
I have the simplest OPF problem, but I can't get matpower to do it for me.
I would appreciate if someone could help me.
I have attached a figure of the system. Here is the description of the
system:
4 buses including 1 generator and 3 load buses:
mpc.bus = [
130
Hello,
I have been reading the manual of MP specifically the opf. It seems that
opf
optimizes the cost. Am I right?
How can I optimize the power lose regardless of cost?
How can I add other objective functions to Matpower?
Thx
OOzy
Hello all
i wanted to compare between AC OPF results and DC OPF results using MOST
My code for AC OPF is:
define_constants;
verbose = 1;
mpopt = mpoption('verbose', verbose);
mpopt = mpoption(mpopt, 'out.gen', 1);
mpopt = mp
Dear sir,
I want to do the extensible OPF, and I read paper MATPOWER’s Extensible Optimal
Power Flow Architecture.
The objective function is min f(x)+fu(x,z),and fu=sum(ci*ri), following the
code:
Ar = [I I];
om = add_vars(om, 'R', ng, [], Rmin, Rmax);
om = add_constraints(om, '
Dear All,
I am working with congestion management using generation
rescheduling technique for that i want to know power flows for all the
lines this can be achieved by using AC OPF. I considered PJM 5-Bus system
and run AC OPF, the OPF result shows that there is branch flow
Greetings,
I wonder can matpower OPF solve dynamic OPF problem: the optimal schedule of
generators over 24 hrs to minimize the total cost?
In additon to static OPF of each hr constraints, ramping constraints need to be
satified (the generator cannot increase/decrease too much power within short
Greetings,
I wonder can matpower OPF solve dynamic OPF problem: the optimal schedule of
generators over 24 hrs to minimize the total cost?
In addition to static OPF of each hr constraints, ramping constraints need to
be satisfied (the generator cannot increase/decrease too much power within
The LMP are shadow prices (Lagrange multipliers) on the active nodal
balance. Even if there is no load at a bus, its balance equation must
still be fulfilled and it carries with it a multiplier in the lagrangian
function.
Mounika Vanjarapu wrote:
I have a doubt regarding the LMPs in an IEEE-1
If you’re asking how it is possible for MATPOWER to give that result, the
answer is that those are inputs … and MATPOWER solves the problem you give it.
If you want to know why case14 was created with PG = 0 for 3 of its 5
generators … see my answer to another post about an hour or so ago
Yes, this is an Optimal Power Flow, with a specific objective function and
specific bounds on the optimization variables.
Ray
> On Aug 4, 2017, at 8:41 AM, Ehsan Hejri wrote:
>
> Hi Dear Community,
>
> I have a strange question about OPF.
>
> If I use a sol
Dear Prof. Zimmerman,
Thanks for the answer. I have read some previews discussion about OPF. It
is mentioned that in OPF we do not care about type of buses (PQ or PV). But
in my case we use runpf function to find OPF and for runpf, type of node is
important.This method is still correct?
Best
Ok. I didn’t catch that you are using runpf() as a subroutine called by
fmincon(). I’m not surprised this works, and of course it can be considered a
“correct” OPF. But, as you say, it’s much less efficient than what I thought
you were doing which is something like ...
define_constants;
mpopt
Hello sir,
currently, I am working on optimal power flow with additional voltage
stability constraint.
so for this, I have a function for calculating voltage stability index.
Now, is it possible to add this extra variable to OPF as a constraint?
please guide me for how can I start my work with
Dear all,
is it possible to caclculate unconstrained opf in matpower?
I set all line flows on value zero, but results are same as in original file.
Best regards,
Emir
hello
I'm student of electrical engeenearing.Ihave some questions about opf at
matpower.at"poewer system analysis" by Johnj.grainger
and WilliamD.Stevenson- i understood for computation lambda we have gencost
function (Quadratic function like C= aP^2 +bP+c)
and lambda=
hello
I'm student of electrical engeenearing.Ihave some questions about opf at
matpower.at"poewer system analysis" by Johnj.grainger
and WilliamD.Stevenson- i understood for computation lambda we have gencost
function (Quadratic function like C= aP^2 +bP+c)
and lam
hi all
Can I use Extended OPF for security constrainted OPF?
thanks
fuel for generating power
depending of its price. For example, only gas, gas and coal, gas and diesel,
only coal, etc.
For modeling this situation and run a DC OPF, we can add a row for each
combination on the 'gen' and 'gen cost' matrix. The problem appears when
different combi
fuel for generating power
depending of its price. For example, only gas, gas and coal, gas and diesel,
only coal, etc.
For modeling this situation and run a DC OPF, we can add a row for each
combination on the 'gen' and 'gen cost' matrix. The problem appears when
different combi
You are correct. And MATPOWER's OPF solvers assume continuous cost functions.
--
Ray Zimmerman
Senior Research Associate
211 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Jun 13, 2011, at 11:53 AM, HOSSEIN SHARIFZADEH wrote:
> Dear Dr Zimmerman
>
&g
Dear All,
I have two short questions if I may.
1st: Is there a way to tell to the opf function to disregard the power limits
of Generators (min/max) or the branch flow limits? Or I have to change the
limits myself accrdingly in the system struct before I run a new OPF?
2nd: I realised that the
Dear Mr. Zimmermann,
I am working with Matpower since many years and really appreciate your great
work!
I am currently working on multiperiod OPF problems and would like to know if
there is already an implementation in matpower for this issue.
Maybe you already have some unreleased code (from
Neither. The OPF already optimizes the voltage dispatch within the limits set.
So if you want to set a specific voltage at a bus for an OPF problem you want
to set bus(2, VMIN) = bus(2, VMAX) = .
--
Ray Zimmerman
Senior Research Associate
419A Warren Hall, Cornell University, Ithaca, NY 14853
Dear sir,
Do you have a copy of tsc opf ?
--
-
schools of electrical engineering and automation ,Tsinghua University,China..
At 2013-06-14 17:17:48,"Cédric Josz" wrote:
Hi Ray,
I'm getting back to you on
t; I have the simplest OPF problem, but I can't get matpower to do it for me.
> I would appreciate if someone could help me.
>
> I have attached a figure of the system. Here is the description of the
> system:
>
> 4 buses including 1 generator and 3 load buses:
>
> mpc.bu
_q apf
> mpc.gen = [
> 1 2 0 100 -100 1.02 100 1 318 0 0 0 0 0 0 0 0 0 0 0 0;
> ];
>
> Please find attached the case modeling and the results,
>
> best regards
>
>
> On 16 December 2013 10:48, Arash Alimardani wrote:
>
>> Hello all,
>>
>> I have t
Dear matpower community,
I have a simple 4 bus system with 3 branches to deal with. The figure of
the system is attached, and here is the data of it:
mpc.baseMVA = 1;
mpc.bus = [
1300001100111;
22000011-2
Dear Matpower users,
Does anybody know how can I implement a multiobjective OPF in MATPOWER?
Best regards
Carlos
Dear Friends
Because of uncertainty in load and generation , I need to use fuzzy OPF and
fuzzy Load flow.
Could you help me with a sample file or a method to use MATPOWER in this
situation?
Best Regards
From: OOzy Pal mailto:oozy...@gmail.com>>
Reply-To: MATPOWER discussion forum
mailto:matpowe...@list.cornell.edu>>
Date: Fri, 21 Feb 2014 22:30:15 +0300
To: mailto:MATPOWER-L@cornell.edu>>
Subject: OPF
Hello,
I have been reading the manual of MP specifically the opf.
I want to run OPF on 30-bus system by adding a wind plant and a storage on
two diff buses. How to model such system.Can I add a Generator at bus which
is not a gen Bus ?
I have the manual provided with the MATPOWER package,is there any other
document which can provide more clear picture about
Hi, I am new at using Matpower and I have two questions:
1. I tried to launch an OPF but I wanted it to only vary the reactive power of
the generators to get to a solution, thus I put Pmax, Pmin and Pg to the same
values. Apparently I cannot do that because I get the following error message
ling
of the network. Some work has been done on an AC implementation, but it is not
yet ready for release.
Maybe someday … but currently, MOST is limited to a DC model of the network.
— Ray
> On Nov 19, 2017, at 12:42 PM, Mohammed Alhajri wrote:
>
> Hello all
>
> i wanted to com
the
> network.
>
> — Ray
>
>
>
> On Nov 19, 2017, at 12:42 PM, Mohammed Alhajri wrote:
>
> Hello all
>
> i wanted to compare between AC OPF results and DC OPF results using MOST
>
> My code for AC OPF is:
>
> +
Actually our target is to do an economic dispatch for a given network in
presence of Solar PV Power
We want to do the ED for multiple periods,24hr, and we want to use AC OPF
to compare the simulation results with the practical results
is there any way to do this task?
بتاريخ ٢٠١٧/١١/٢١ ٨:١٧ م
Not without writing your own code to do it. Check the MATPOWER-L archives for
multi-period OPF. For example …
https://www.mail-archive.com/matpower-l@cornell.edu/msg00702.html
<https://www.mail-archive.com/matpower-l@cornell.edu/msg00702.html>
— Ray
> On Nov 21, 2017, at
Dear All MATPOWER developers and users,
I really hope some of you can give me some advice.
I am working on sequential OPF simulations (not using MOST, but simply
running MATPOWER's runopf in a loop and manually updating some values the
MATPOWER case at each time-step t) to be performed on a c
A) imposed in the OPF problem, so I would expect the runopf
>function to converge.
Instead the OPF run function does not converge.
What could it be due to?
Diego
Hi Yang,
It’s not clear whether you simply want to use the fixed reserves extension (see
Section 7.6.1 in the MATPOWER User’s
Manual<https://matpower.org/docs/MATPOWER-manual-7.0.pdf>) or you want to
implement your own OPF extension. In the first case you can simply use
runopf_w_res().
s for your patience and guidance.
Warm regards.
Yang.
At 2020-01-03 01:36:43, "Ray Daniel Zimmerman" wrote:
Hi Yang,
It’s not clear whether you simply want to use the fixed reserves extension (see
Section 7.6.1 in the MATPOWER User’s Manual) or you want to implement your own
O
*Pi^2)+(αi+βi*Pi+γi*Pi^2+μi*exp(ηi*Pi))]}}.
Thanks again.
At 2020-01-03 01:36:43, "Ray Daniel Zimmerman" wrote:
Hi Yang,
It’s not clear whether you simply want to use the fixed reserves extension (see
Section 7.6.1 in the MATPOWER User’s Manual) or you want to implement your ow
to implement your own OPF extension. In the first case you can
simply use runopf_w_res(). In the second, please see Chapter 7 and
the code for the various extensions described in Section 7.6.
Ray
On Dec 25, 2019, at 8:11 PM, Yang mailto:yang_hong_...@163.com>> wrote:
t;Ray Daniel Zimmerman" wrote:
Hi Yang,
It’s not clear whether you simply want to use the fixed reserves extension (see
Section 7.6.1 in the MATPOWER User’s Manual) or you want to implement your own
OPF extension. In the first case you can simply use runopf_w_res(). In the
second, please
6.1 in the MATPOWER User’s Manual) or you want to implement your own
OPF extension. In the first case you can simply use runopf_w_res(). In the
second, please see Chapter 7 and the code for the various extensions described
in Section 7.6.
Ray
On Dec 25, 2019, at 8:11 PM, Yang wrote:
D
s/MATPOWER-manual-7.0.pdf>) or you want to
implement your own OPF extension. In the first case you can simply use
runopf_w_res(). In the second, please see Chapter 7 and the code for the
various extensions described in Section 7.6.
Ray
On Dec 25, 2019, at 8:11 PM, Yang
mailto:yang_hon
e, how can I do this ?
Thanks.
At 2020-01-03 01:36:43, "Ray Daniel Zimmerman" wrote:
Hi Yang,
It’s not clear whether you simply want to use the fixed reserves extension (see
Section 7.6.1 in the MATPOWER User’s Manual) or you want to implement your own
OPF extension. In the
ection 7.6.1 in the MATPOWER User’s
Manual<https://matpower.org/docs/MATPOWER-manual-7.0.pdf>) or you want to
implement your own OPF extension. In the first case you can simply use
runopf_w_res(). In the second, please see Chapter 7 and the code for the
various extensions described in S
Dear Ray,
Thanks for your reply. I understand your explain, and I have new problem as
following:
1. May I make OPF be a dynamic model? I want to implement it in typhoon
situation, like at t=1, it's normal; at t=2, the load of branch 1 needs to
decraese 10%; at t=3, the load of bra
>> wrote:
Dear Ray,
Thanks for your reply. I understand your explain, and I have new problem as
following:
1. May I make OPF be a dynamic model? I want to implement it in typhoon
situation, like at t=1, it's normal; at t=2, the load of branch 1 needs to
decraese 10%; at t=3, the load
mples, to get a feel for what it can do.
Ray
On Jan 30, 2020, at 4:36 AM, Yang wrote:
Dear Ray,
Thanks for your reply. I understand your explain, and I have new problem as
following:
1. May I make OPF be a dynamic model? I want to implement it in typhoon
situation, like at t=1, it
Hi all
Does Matpower have any method to calculate the optimal power flow within 24
hours, with a period of 1 hour, considering the influence of generator slope
climbing and landslide.
Thank you very much.
Hi all
How to use Matpower to model reactive power planning?
Thank you very much.
Dear all,
I can’t get the convergence for the OPF on a radial distribution network
described by the mpc file that I attached. The power flow with this case file
converge and all the voltage busses are between without violating any
costraints. The OPF doesn’t converge with the standard voltage
The OPF constraints the flows in the lines to not exceed their limits, so if it
converges, there is no excess flow. See Tables 4-1 and 6-1 in the User’s Manual
<http://www.pserc.cornell.edu/matpower/docs/MATPOWER-manual-5.1.pdf> for
details of the results struct and where the resulting
(casefile,mpoption('OUT_ALL', 0, 'VERBOSE', 0,
'OPF_FLOW_LIM', 2));
So then, after the simulation ends, I wanted to see why the OPF did not
converge, but, when I opened matlab and loaded the casefile, this one
succeeded So I just did:
load casefile;resultsOP
Dear all,
I have a convergence problem when running the OPF. When I used the Matpower
vesion 4.1 my casefile converged in pf but not in opf. I have recently
installed the new version of Matpower 5.1 and when running the opf I get the
following message which I do not understand:
??? Error
Hello everyone,
I am a bit confused about the lamda value that results from running an opf. Are
these results the locational marginal prices for the buses?
Can you also tell me when a user added function is optimized. Is it optimized
alongside the fuel costs or are the processes two different
This problem will be handled by MOST (MATPOWER Optimal Scheduling Tool), which
will be included in the imminent MATPOWER 6.
Ray
> On May 17, 2016, at 4:40 PM, Bai, Wenlei wrote:
>
> Greetings,
> I wonder can matpower OPF solve dynamic OPF problem: the optimal schedule of
sir, in my 5 bus system the power is running but not the optimal power
flow. please check what is the problem in program , I have attached my
matpower file
function mpc = add_userfuc(casem5)
mpc.version = '2';
mpc.baseMVA = 100;
%No. Bus Pmin Pmax Marginal Cost
% bus_i type Pd Qd Vm Va Vmax V
Dear Ray,
I noticed that when I 'results = runopf('case')', I am able to find the control
variables by 'results.x';
however, the control variables consist of all the bus angles, bus voltages, P
output from generator buses(including slack bus), and reactive power Q from
generator buses (includ
Dear,
I have implemented the two area kundur topology in the matpower software. I can
successfully run a PF and OPF. My next goal is the change the objective of the
OPF so that the voltages on the busses are as close to unity as possible
independently from the cost of the generators. For this
Hello,
I am trying to solve an OPF problem where all the PV nodes are fixed to a
certain power and voltage by an equality constraints, and only the slack
bus is left free.
The power consumed by the loads (including losses) is more than the fixed
values of the generators but less than the total
Hello all
I tried to do OPF for my network but i get Numerically Failed!
i have already relaxed the voltage constrain, but the problem is still there
My *.m file is attached, can anyone help me?
OETC_OPF.m
Description: Binary data
.com>> wrote:
>
> Hello sir,
>
> currently, I am working on optimal power flow with additional voltage
> stability constraint.
> so for this, I have a function for calculating voltage stability index.
>
> Now, is it possible to add this extra variable to OPF as a constra
voltage stability index.
>
> Now, is it possible to add this extra variable to OPF as a constraint?
> please guide me for how can I start my work with manpower.
>
> thank you.
>
>
>
rote:
>>
>> Hello sir,
>>
>> currently, I am working on optimal power flow with additional voltage
>> stability constraint.
>> so for this, I have a function for calculating voltage stability index.
>>
>> Now, is it possible to add this extra variable to OPF as a constraint?
>> please guide me for how can I start my work with manpower.
>>
>> thank you.
>
gt;
>> Ray
>>
>>
>> On Jan 7, 2019, at 5:46 AM, Pranami Kuldip wrote:
>>
>> Hello sir,
>>
>> currently, I am working on optimal power flow with additional voltage
>> stability constraint.
>> so for this, I have a function for calculatin
Hello Dear
I also want to add some constraints related with renewable energy in the
master OPF problem. Help needed in this regards.
Best regards
Fouad Hasan
On Tue, Jan 29, 2019 at 4:20 AM Pranami Kuldip wrote:
> Dear Sir,
>
> I had gone through this MATPOWER 7.0b1. section 6.3.2 an
There is an example of adding constraints by direct specification in the OPF
test files, for example see t_opf_default.m starting at line 229
<https://github.com/MATPOWER/matpower/blob/7841457957251b3135bd3a534bbc171ae672957a/lib/t/t_opf_default.m#L229>.
Ray
> On Jan 30, 2019, a
n Fri, 1 Feb 2019, 9:14 pm Ray Zimmerman There is an example of adding constraints by direct specification in the
> OPF test files, for example see t_opf_default.m starting at line 229
> <https://github.com/MATPOWER/matpower/blob/7841457957251b3135bd3a534bbc171ae672957a/lib/t/t_opf_default
Hello,
I have a question regarding the use of user_function_constraints in na OPF.
Is it possible for the OPF to converge and not complying to an user constraint
(for example using
"add_userfcn(mpc,'formulation',@userfcn_constraints_formulation,args)"?
Thank you for y
Hello,
I have a question regarding the use of user_function_constraints in na OPF.
Is it possible for the OPF to converge and not complying to an user constraint
(for example using
“add_userfcn(mpc,'formulation',@userfcn_constraints_formulation,args)”?
Thank you for your attent
Dear All,
I am currently working on extensions of OPF problem and got one question.
Could you please advise if Matpower provides any possibility for easy
coding of "least squares" OPF problems of the following form:
Minimize sum( (P_setpoint^i - P_G^i)^2+(Q_setpoint^i
o caclculate unconstrained opf in matpower?
> I set all line flows on value zero, but results are same as in original file.
>
> Best regards,
>
> Emir
>
you .
best regards
On Tue, Sep 11, 2018 at 12:30 PM Emir Ćosić wrote:
> Dear all,
> is it possible to caclculate unconstrained opf in matpower?
> I set all line flows on value zero, but results are same as in original
> file.
>
> Best regards,
>
> Emir
>
>
Dear all,
I have been tried to solve the OPF problem with GAMS. In GAMS the problem
configuration is just like what printed on paper and books.
In Matpower, where could find these Equation and inequality formulations.
Thanks in advance!
Best regards!
Hi all
I need a OPF benchmark with its data
thanks
On Jul 4, 2008, at 2:10 AM, hamid tahery2009 wrote:
hello
I'm student of electrical engeenearing.Ihave some questions about
opf at matpower.at"poewer system analysis" by Johnj.grainger
and WilliamD.Stevenson- i understood for computation lambda we have
gencost function (Qua
Dear everyone,
I would like to seek your advice and suggestion.
I use MatPower V.3.2 to simulate my 30 buses system, and I faced two problems
which I am not sure about the cause.
The first problem is that system does not converge. Maximum number of iteration
exceeded.
The second problem is th
calculate other two.
So at PV bus voltage is fixed and it can not change. But why in OPF the voltage
even at the PV bus changes? I know optimization is performed on a bigger space
but even then the power flow equations have to be satisfied in OPF. And what
are
the variable quantities at the buses
MATPOWER does not included security constrained OPF directly, but you may be
able to formulation some security constraints as additional linear restrictions
on the OPF variables. In that case, you can use the extended OPF to add those
constraints.
--
Ray Zimmerman
Senior Research Associate
211
Dear professor
I want to simulate your paper
A Transient Stability Constrained Optimal Power Flow
please guide me
--- On Mon, 11/1/10, Ray Zimmerman wrote:
From: Ray Zimmerman
Subject: Re: Extended OPF
To: "MATPOWER discussion forum"
Date: Monday, November 1, 2010, 9:28 PM
MAT
/1/10, Ray Zimmerman mailto:r...@cornell.edu>>
wrote:
From: Ray Zimmerman mailto:r...@cornell.edu>>
Subject: Re: Extended OPF
To: "MATPOWER discussion forum"
mailto:matpower-l@list.cornell.edu>>
Date: Monday, November 1, 2010, 9:28 PM
MATPOWER does not included security co
Hi all
I am interested to add an objective function to the OPF formulation.
The objective of the function is to minimize the deviation of the
power exchange (active and reactive) between areas in a big power
system, calculation the deviation from the start point.
The main idea is maintain the
gas and diesel, only coal,
> etc.
>
> For modeling this situation and run a DC OPF, we can add a row for each
> combination on the 'gen' and 'gen cost' matrix. The problem appears when
> different combinations are possible but these are not feasible in t
Dear Prof. Zimmeman,
Could please let me know how can I implement multi period OPF in MATPOWER?
How can I change the objective function?
Best Wishes
Roberto
Sir, I want to implement a opf with UPFC device in a power system and obtain a
OPF
solution.Can it be done with matpower? Can you help me in this case,please.
On Sep 30, 2012, at 3:06 PM, Evangelos Galinas wrote:
> 1st: Is there a way to tell to the opf function to disregard the power limits
> of Generators (min/max) or the branch flow limits? Or I have to change the
> limits myself accrdingly in the system struct before I run a new OPF?
). So in order to make my
code more eefficient and avoid all these checks is there a way to get to know
if at least one constraint got violated, for example somehow accessing these
extra prints?
Thanks once more,
Vagelis
From: r...@cornell.edu
Subject: Re: OPF questions
Date: Mon, 1 Oct 2012 10
No, as I said below "If the OPF converges successfully all constraints will be
satisfied." In other words, if success = 1 there should be no violated
constraints. The extra printout is for binding constraints. These are not
violated, they are simply operating at their specified limit
We do have unreleased research code related to multi period OPF … but it is not
released for a reason. ;-)
You may have already seen this post that outlines the approach I would take …
http://www.mail-archive.com/matpower-l@list.cornell.edu/msg00702.html
--
Ray Zimmerman
Senior Research
Betreff: Re: Multiperiod OPF
We do have unreleased research code related to multi period OPF … but it is not
released for a reason. ;-)
You may have already seen this post that outlines the approach I would take …
http://www.mail-archive.com/matpower-l@list.cornell.edu/msg00702.html
--
Ray
I assume you mean transient-stability constrained OPF? No, I do not.
--
Ray Zimmerman
Senior Research Associate
B30 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Jun 15, 2013, at 11:50 AM, 舒 wrote:
>
> Dear sir,
> Do you have a copy o
Dear Dr Zimmerman,
Running an OPF in matpower means that
1. Bus types play no role (eg slack, PV, PQ etc)
2. All values for Real Power generation and reactive power generation are
unknown
3. All values for bus_voltages and voltage phase angles in buses, are unknown
as well
4. As a result
Dear All,
Dr Zimmerman once said:
"The power flow solver does not redispatch generation in order to respect
the line flow limits specified in branch(:, RATE_A). For that, you will
need to use the OPF."
But for some reason I don't want to use OPF! .Has anyone written a code to
u
Hello!
I'm trying to use the callback functions of the Extended OPF in order to
add variable, constraints and costs to my case, but in spite of reading
your manual and papers for about one month I can't use them all together
yet!
I'm afraid, could you please give me just a very
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