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. > > > > > > > > > > >
