Once again, without seeing the details of what you are doing, it is impossible
for us to guess where the error is. If you want help for your specific case,
you will have to provide us with a small example (little snippet of Matlab
code) that allows us to reproduce the error here.
Ray
--
Ray Zimmerman
Senior Research Associate
B30 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Mar 12, 2014, at 8:50 AM, Jaimini Gohel <[email protected]> wrote:
> Thank you for your reply sir.
> But here at least a modified case for example: I made a file having modified
> IEEE 30 bus sytem with the generators lined up from 1:6 and now when am
> trying to run PTDF thing on it or any other modified case its not running at
> all..intead its giving me this error: '??? Attempt to reference field of
> non-structure array.'
> What does this mean?? And how do I correct this? Please reply asap.
>
>
> On Wed, Mar 12, 2014 at 3:02 PM, Tao Huang <[email protected]> wrote:
> I would suggest you firstly learn more about the definition of PTDF (power
> transmission distribution factor). You could also get some hint from its
> name…. it is a “factor” which basically gives you information as to how power
> would distribute over the whole network (each line) if you want to transmit
> some power from one bus to another, of course, linearity is assumed when
> using PTDF. So, as long as you do not change the topology or parameters of
> the GRID, the PTDF would keep the same. That is the reason why the results
> are always the same in your case.
>
> Pls try to cut a line in your network and see…
>
>
> tao
>
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Jaimini Gohel
> Sent: Wednesday, March 12, 2014 9:49 AM
> To: MATPOWER discussion forum
> Subject: Re: regarding makePTDF
>
>
>
> Sir I tried again to see if am making a mistake in using makePTDF..but its
> again giving me the same ans and not a single change is there in result.
> Please if anyone can give me the reason behind it i'l be very thankful. Thank
> y
>
>
>
> On Wed, Mar 12, 2014 at 10:22 AM, Jaimini Gohel <[email protected]> wrote:
>
> Sir there is no specific error that it displays..it just gives me the same
> ans every time i run it with any loadcase as in changed data. I tried to see
> again if am doing or entering wrong arguments but I couldn't figure out. What
> I did was I ran a generator outage case, an increased load case and the
> normal standard data case (say 6 bus system), and all of them gave me the
> same result. Why is it not giving any difference between its answers? Will
> appreciate a quick response.
>
> Thank you for your time sir.
>
>
>
> On Tue, Mar 11, 2014 at 7:25 PM, Ray Zimmerman <[email protected]> wrote:
>
> There is no way for us to guess without specifics of the error message and
> the inputs that are producing it.
>
>
>
> --
>
> Ray Zimmerman
>
> Senior Research Associate
>
> B30 Warren Hall, Cornell University, Ithaca, NY 14853
>
> phone: (607) 255-9645
>
>
>
>
>
>
>
> On Mar 11, 2014, at 8:20 AM, Jaimini Gohel <[email protected]> wrote:
>
>
>
>
> Hello,
>
> Can someone please tell me why makePTDF is not taking any loadcase
> data..the one that I want to run and not the standard figures? Whenever I try
> to it gives me error
>
>
>
> On Sun, Mar 2, 2014 at 10:53 PM, Jaimini Gohel <[email protected]> wrote:
>
> thank you so much for your timely help.
>
>
>
> On Sun, Mar 2, 2014 at 9:06 PM, Jovan Ilic <[email protected]> wrote:
>
>
>
> Jaimini,
>
>
>
> Reading the help (>> help makePTDF) and an example is probably the best
>
> answer here:
>
>
>
> case4gs = loadcase(case4gs)
>
>
>
> >> makePTDF(100,case4gs.bus,case4gs.branch,1)
>
>
>
> ans =
>
>
>
> 0 -0.7325 -0.1975 -0.5350
>
> 0 -0.2675 -0.8025 -0.4650
>
> 0 0.2675 -0.1975 -0.5350
>
> 0 -0.2675 0.1975 -0.4650
>
>
>
> >> makePTDF(100,case4gs.bus,case4gs.branch,2)
>
>
>
> ans =
>
>
>
> 0.7325 0 0.5350 0.1975
>
> 0.2675 0 -0.5350 -0.1975
>
> -0.2675 0 -0.4650 -0.8025
>
> 0.2675 0 0.4650 -0.1975
>
>
>
>
>
>
>
> On Sun, Mar 2, 2014 at 3:33 AM, Jaimini Gohel <[email protected]> wrote:
>
> I am having a rough time using makePTDF function..every time I try to use
> that I get the same error saying it has prob in identifying the slack bus and
> bus type. can anyone please guide me as to how do i use this function? I did
> read the manual n help instriuctions too and tried to follow them but I guess
> am not able to interpret those help instructions correctly. Please guide me
> on this. I'd appreciate a quick response. Thank you
>
>
>
>
>
>
> --
>
> A pessimist is an optimist with experience.
>
>
>
>
>
>
>
>
>
>
>
>
