Thank you for your informative answers Abhyankar. One more thing, when I use *voltage_dev= max(absV') - min(absV') *to calculate the voltage deviation of each buses, I should set the cpf option to NOSE and not FULL. Is that also correct?
On Thu, Nov 30, 2017 at 6:49 PM, Abhyankar, Shrirang G. <abhy...@anl.gov> wrote: > > > > > > > *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> 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> > 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> > 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> on behalf of > Electric <electricaltranslat...@gmail.com> > *Reply-To: *MATPOWER discussion forum <matpowe...@list.cornell.edu> > *Date: *Monday, November 27, 2017 at 4:23 AM > *To: *MATPOWER discussion forum <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. > > > > > > > > >
