Hi everyone,
I had a question about the CPF function in MATPOWER6.0 which I am using to
to check the limit induced bifurcation (LIB) points of different systems.
I noticed for case300, while the maximum generator var limits were being
respected, the minimum var limit of one generator was being
Hi Juliane,
I don't have a lot of experience with this, but in one case when I
approximated the Var limits, a crass way I used was to approximate the
*Qgmax* was by ensuring that (*Pg*^2+*Qgmax*^2) be a reasonable percentage
of the MVA rating (say 80 or 90%). If you want it to be accurate, you
Hi Fereshteh,
get_losses is an inbuilt MATPower function that computes the branch losses
and can also compute the reactive injections from line charging. It can
also compute the derivatives with respect to voltage etc. , the details can
be found in the manual in Chapter 9.
Shruti
On Fri, Feb
If the system parameters are the same, it could be because the tolerance
levels that were set for the different software were different i.e. the
default power balance mismatch tolerances are not always the same in all
software. Also probably if the VAR limits are active for PV buses,
different
You can get the branch flows on each line from MATPOWER in the output
anyway in branch data. It will be displayed in output window as well as if
you save your results in a variable say results:
results = runpf(case);
The branch P and Q flows will be saved in results.branch. You can then
calculate
nction
> you're looking for is lu(), see Lines 80--104 and 129--135 in
> http://www.pserc.cornell.edu//matpower/docs/ref/matpower5.1/fdpf.html
>
>
> Regards,
>
> --
> Jose L. Marin
> Gridquant España SL
> Grupo AIA
>
>
> On Fri, Oct 23, 2015 at 5:22 AM, Shruti Ra
wrapper function mplinsolve()
>>> <http://www.pserc.cornell.edu//matpower/docs/ref/matpower5.1/mplinsolve.html>
>>> that
>>> allows you to choose between different linear solvers for computing the
>>> Newton update step in the MIPS interior-point OPF algor
docs/ref/matpower5.1/mplinsolve.html>,
>> because even for the largest systems I tried, there was little or no
>> advantage to PARDISO, and the extra overhead was noticeable on small
>> systems.
>>
>>Ray
>>
>>
>> On Oct 19, 2015, at 1:05 AM, Shruti Rao
Greetings MATPower community,
I had a question about the way sparsity-based techniques are used in the
Newton-Raphson solver of the power flow algorithm in MATPower.
I ran the code step-by-step and from my understanding, the way the sparsity
of the Jacobian matrix is exploited is that it is
that have symmetric Jacobians (due
> to inactive taps), a Cholesky factorization is used (LL^T = A). For cases
> that lead to non-symmetric Jacobian, MATLAB uses UMFPACK for performing the
> linear solve.
>
> Shri
>
> From: Shruti Rao <sra...@asu.edu>
> Reply-To: MATPO
es perform some sort of matrix reordering to reduce
> the fill-ins in the factored matrix. For instance, UMFPACK uses an
> approximate minimum degree reordering scheme by default.
>
> Shri
>
> From: Shruti Rao <sra...@asu.edu>
> Reply-To: MATPOWER discussion forum <matpowe
> Hi,
> By setting it to 1, you will check for generator Var limits and bus-type
switching will take place accordingly with simultaneous conversions. The
option 2 switches only one bus at a time. By default (option 0) generator
Var limits are not checked.
>
> Regards,
> Shruti
>
> On Sep 20, 2015
not check for VAR limits even if you turn this option to 1 or 2.
Hope this helps.
Shruti
On Sun, Sep 20, 2015 at 1:51 AM, rainy chung <chunyu...@gmail.com> wrote:
> I made an experiment, it seemed the VAR limits with and without specifying
> this are the same.
>
> 2015-09-20 16:4
Hi,
I think irrespective of for which bus the P-V curve is plotted, the maximum
lambda represents the voltage collapse point for the entire system.
On Sun, Aug 9, 2015 at 9:23 PM, nilesh patel nk2...@rediffmail.com wrote:
Sir,
When we run continuation power flow for particular system, we get
Hi all,
I was trying to scale the loads and generation in MATPower using the
following lines:
clc;clear all;
define_constants;
mpcb = loadcase('case118'); % load base case
mpct = mpcb; % set up target case with
mpct.bus(:, VM) = 1;
mpct.bus(:, VA) = 0;
mpct.gen(:, VG) = 1;
mpopt =
13, 2015, at 3:58 PM, Shruti Rao sra...@asu.edu wrote:
Hi all,
I was trying to scale the loads and generation in MATPower using the
following lines:
clc;clear all;
define_constants;
mpcb = loadcase('case118'); % load base case
mpct = mpcb; % set up target case with
mpct.bus(:, VM) = 1
= loadcase(your case file);
mpc.bus(:, VM) = 1;
mpc.bus(:, VA) = 0;
mpc.gen(:, VG) = 1;
results = runpf(mpc);
— Ray
On Feb 18, 2015, at 8:37 PM, Shruti Rao sra...@asu.edu wrote:
Hi all,
Does MATPower use flat start to get the initial estimate when solving the
power flow problem
and eventually incorporated in MATPOWER.
Shri
On Oct 31, 2014, at 6:56 PM, Shruti Rao sra...@asu.edu wrote:
Hi,
I wanted to know if the CPF function added to the new version of
MATPOWER also checks for VARlimits?
I used the option of 'pf.enforce_q_lims',1 in my mpopt option, however
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