From: <bounce-122089986-73493...@list.cornell.edu> on behalf of Electric
<electricaltranslat...@gmail.com>
Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu>
Date: Thursday, November 30, 2017 at 2:42 AM
To: MATPOWER discussion forum <matpowe...@list.cornell.edu>
Subject: Re: How to find max-load ability for each bus of power system
Thank you for your hint Ray,
I two questions about CPF, would be glad if someone reply.
1. What is the specifics of the bus that CPF plots itself? Does it means the
voltage at that bus has been violated more than the others?
When the option cpf.plot.level is set to greater than 0, CPF plots the bus
voltage magnitude for a given bus if the bus number is provided via the option
cpf.plot.bus. If this option is not used then it plots the voltage magnitude
for the bus (type PQ) with the largest transfer.
2) I calculate the voltage violation as follows:
absV=abs(res.cpf.V); % nb* nitr
last_itr=size(absV,2);
voltage_dev= max(absV') - min(absV'); % voltage violation
figure(2)
bar ( voltage_dev)
Is this correct?
Looks fine to me for what you are trying to do.
the curve that cpf plots is not always the same as the index of the bus
corresponding to max(voltage_dev)
See my above point on which bus CPF selects for plotting.
Thanks.
On Tue, Nov 28, 2017 at 5:43 PM, Ray Zimmerman
<r...@cornell.edu<mailto:r...@cornell.edu>> wrote:
You may also want to consider the code in extras/maxloadlim which uses an OPF
to find the maximum loadability. You can find the manual for this code on
GitHub
here<https://github.com/MATPOWER/matpower-extras/blob/master/maxloadlim/manual/maxloadlim_manual.pdf>.
Ray
On Nov 28, 2017, at 5:45 AM, Electric
<electricaltranslat...@gmail.com<mailto:electricaltranslat...@gmail.com>> wrote:
Thank you for your informative answer. If I only increase the load at a single
bus, i, in the target case, does Max lambda indicates vulnerability of bus i,
for voltage stability of power system.
In other words, does it mean that bus is critical for voltage stability studies?
On Mon, Nov 27, 2017 at 11:22 PM, Abhyankar, Shrirang G.
<abhy...@anl.gov<mailto:abhy...@anl.gov>> wrote:
Hello,
MATPOWER’s CPF requires two data files; the first one having the base
loading/generation, called basecasedata, and the other that has the target
loading/generation, called targetcasedata. The CPF traces the trajectory of
solutions along increasing lambda direction, with lambda = 0 at the base-case
solution and lambda = 1 at the targetcase. Lambda can go beyond or less than 1
depending on where the system collapses (maximum loadability limit).
From your question, it seems like you want to increase the load at a single
bus. For this, you merely need to modify the load for the given bus in the
targetcase data and run the CPF.
Shri
From:
<bounce-122078874-73493...@list.cornell.edu<mailto:bounce-122078874-73493...@list.cornell.edu>>
on behalf of Electric
<electricaltranslat...@gmail.com<mailto:electricaltranslat...@gmail.com>>
Reply-To: MATPOWER discussion forum
<matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Date: Monday, November 27, 2017 at 4:23 AM
To: MATPOWER discussion forum
<matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: Fwd: How to find max-load ability for each bus of power system
I am interested to find the max load-ability at each bus in order to find the
most critical buses in a power system in aspect of voltage stability. How is
it doable?
I thought of cpf, but it merely returns the max lambda which is an index for
whole system.
