On Apr 25, 2013, at 7:34 AM, Hendrik Acker wrote:
> Dear Mr. Zimmerman,
> what do you mean by setting the Bus_type to none? I thought the bus type has
> to be a 1-digit between 0 and 3.
Bus_type is a single digit between 1 and 4. Setting the bus_type = 4 (NONE)
will make the bus out of service.
> As Ashwin, I too, would like to know how to disable/turn off a bus without
> having to remove it from the model-file.
>
> Best regards
> Hendrik Acker
>
> Von: [email protected]
> [mailto:[email protected]]Im Auftrag von Ray Zimmerman
> Gesendet: Montag, 22. April 2013 22:35
> An: MATPOWER discussion forum
> Betreff: Re: re; problem with matpower- removing the bus from network
>
> Are you saying that MATPOWER is incorrectly reporting the total load served?
> Hmmm, yes, it looks like that is true. That would be a bug. I will make a
> note and plan to include a fix in the next version. Thanks for catching that.
>
> --
> Ray Zimmerman
> Senior Research Associate
> 419A Warren Hall, Cornell University, Ithaca, NY 14853
> phone: (607) 255-9645
>
>
>
>
>
> On Apr 22, 2013, at 4:28 PM, Ashwin Venkataramanan <[email protected]> wrote:
>
>
> Dear Dr ZImmerman
>
> I have rectified the above problem.
> But now when i remove the bus or substation there is some load i will not be
> able to supply.
> I am not able to get the value of load being supplied by the system after
> removing the buses.
> That value is not getting updated. Is there any fix to this?
>
> Best Regards
> Ashwin Venkataramanan
>
>
> On Mon, Apr 22, 2013 at 1:19 PM, Ray Zimmerman <[email protected]> wrote:
> 1) Make sure that when you isolate a bus you set it's BUS_TYPE to NONE and
> that your system still has a REF bus.
> 2) I'm not sure what you mean, but you can always load the case and make
> changes before running it, like …
>
> define_constants;
> mpc = loadcase('case118');
> mpc.branch(110, BR_STATUS) = 0;
> r = runopf(mpc);
>
> --
> Ray Zimmerman
> Senior Research Associate
> 419A Warren Hall, Cornell University, Ithaca, NY 14853
> phone: (607) 255-9645
>
>
>
>
>
> On Apr 20, 2013, at 10:53 PM, Ashwin Venkataramanan <[email protected]> wrote:
>
>
> Dear Dr.Zimmerman
>
> I am a graduate student in electrical engineering from Arizona
> state university. I have a doubt about opening buses using MATPOWER. I have
> two questions.
>
> 1) My simulation involves removing a substation out of the network and
> testing if the power flow converges. Just like first contingency analysis for
> substations. Each bus is characterized as a substation or in some cases
> combination of 2 buses are classified as substation. I have read the MATPOWER
> user manual, from which I find only ways to remove branches and generator
> from the network. I have tried the simulation by removing the branches
> connected to the bus using the command
>
> mpc.branch(110,BR_STATUS)=0;
>
> for removing the branch 110 which may connect two buses. Similarly removing
> all the branches connected to a bus in order to isolate a bus. I believe this
> approach is right to remove a bus. But my powerflow diverges each time I
> remove any bus(or substation). I believe this will not be a case as system
> most of time must work for first contingency involving substation. I have
> tested my code on both 118 and 30 bus case. Is there any way to remove bus
> directly off other than removing using the branches(above mentioned approach)
> ?
>
> 2) Is there any way to do convert the existing “case118.m” to modified 118
> bus?
>
>
> Best Regards
>
> Ashwin Venkataramanan
>
> Arizona state university
>
>
>
