On Aug 20, 2012, at 11:11 AM, Carlos E Murillo-Sanchez
<[email protected]> wrote:
> Power networks are usually almost planar, with a few exceptions in which
> lines do cross each other without connection. The obvious place to connect a
> network to another is in peripheral nodes, just a few of them should be
> common. But if you don not have the geographical location of nodes this can
> be hard to do. On the other hand, it might be possible that the person who
> put the data together listed the buses and lines in some kind of systematic
> manner and it might perhaps be possible to figure out a planar map of the
> system.
I am using test cases provided with the MatPower distribution. How easy or
tough would it be to get a planar map of your test cases? Is the bus and the
line data listed in a systematic manner?
Thanks,
Shri
>
> carlos.
>
>
> Shri wrote:
>> On Aug 15, 2012, at 9:03 PM, Carlos E Murillo-Sanchez wrote:
>>
>>> I can envision that this method of randomly connecting two systems might
>>> easily create unsolvable systems, with wild angular differences even if
>>> solvable. That is not how transmission networks are designed.
>> Thanks for your comments Carlos. Any tips on how to go about connecting test
>> cases in an engineered way rather than just naively putting in random lines?
>>
>> If anyone has larger test cases (> 3375 buses) (not neccessarily MatPower
>> format) and willing to share it, I would really love that :)
>>
>> Thanks,
>> Shri
>>> Shri wrote:
>>>> Hi,
>>>> I am trying to create a bigger test case by duplicating a MatPower
>>>> test case (>= 2383 buses) multiple times. To have connectivity between
>>>> each of the bigger areas, I've added randomly chosen tie lines. However, I
>>>> am not able to get power flow to converge.
>>>> Monitoring the residual norm shows that Newton convergence is linear
>>>> in the first few steps and then it diverges. I suspect that this might be
>>>> due to the initial guess given to Newton. My premise is based on observing
>>>> that if a flat start is chosen for some (or all?) of the MatPower test
>>>> cases (>= 2383 buses), Newton doesn't converge and has a similar
>>>> divergence pattern.
>>>>
>>>> I was wondering whether the bus(:,VM:VA), which is part of the initial
>>>> guess to Newton, data was computed using some algorithm or provided by the
>>>> test case data provider.
>>>>
>>>> Thanks and appreciate your help as always!
>>>> Shri
>>>>
>>>>
>>>
>>
>>
>>
>
>
