When you say “it still works,” I assume you mean that the OPF still solves
successfully. When you have an isolated bus, the correct way to deal with it is
to set the BUS_TYPE column in the bus matrix to NONE.
Ray
> On Aug 4, 2016, at 8:18 AM, kin maxe <[email protected]> wrote:
>
> Additional information about above question, I work with dispatchable load.
> When a bus is isolated, I disable it in mpc.gen matrix, it's a right way to
> do it? Cause I found that even if I label it as isolated bus, after
> load2disp, it still works.
>
> 2016-08-04 14:15 GMT+02:00 kin maxe <[email protected]
> <mailto:[email protected]>>:
> One more question about DC OPF, if there is an isolated bus, the DC OPF won't
> be able to work. Is there a way to solve it or I should switch to AC OPF?
>
> 2016-08-02 17:04 GMT+02:00 kin maxe <[email protected]
> <mailto:[email protected]>>:
> Ok, thank you so much
>
> 2016-08-02 17:03 GMT+02:00 Ray Zimmerman <[email protected]
> <mailto:[email protected]>>:
> You can find isolated buses using the find_islands()
> <http://www.pserc.cornell.edu/matpower/docs/ref/matpower6.0b1/find_islands.html>
> function. Isolated buses should be marked as such in the BUS_TYPE column of
> the bus matrix. It should not be necessary to explicitly take isolated
> generators off-line.
>
> Ray
>
>
>> On Aug 2, 2016, at 10:56 AM, kin maxe <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Thanks for your reply. And one more question concerning the reliability
>> assessment, when I simulate certain contingency in which cases I have some
>> isolated buses, the OPF will stop work. I try several approach to solve but
>> all failed, do you have any suggestion?
>>
>> 2016-08-02 16:41 GMT+02:00 Ray Zimmerman <[email protected]
>> <mailto:[email protected]>>:
>> See the recent thread on this topic …
>>
>> http://www.mail-archive.com/[email protected]/msg05303.html
>> <http://www.mail-archive.com/[email protected]/msg05303.html>
>>
>> — Ray
>>
>> (not sure why, but it appears some messages are missing from the archive …
>> looking into it)
>>
>>> On Aug 2, 2016, at 6:25 AM, kin maxe <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>> Dear Matpower community,
>>>
>>> I want to perform an OPF of load shedding in power system reliability
>>> analysis. But I got stuck with the cost function of OPF. How should I
>>> structure the cost matrix?
>>>
>>> Best wishes,
>>> Maxence Zhang
>>
>>
>
>
>
>
