Hello Babulal,
I believe that the problem is that MATPOWER does not automatically remove
islands when running a powerflow. Each of the three contingencies you list
happen to isolate a bus, therefore the network needs to be reduced prior to
the call to runpf (Ray -- please correct me if I'm wrong).
You can use extract_islands() for this:
>> mpc = loadcase(IEEE30_Conting9_11)
mpc =
version: '2'
baseMVA: 100
bus: [30x13 double]
gen: [6x25 double]
branch: [41x13 double]
>> mpc_reduced = extract_islands(mpc, 1)
mpc_reduced =
version: '2'
baseMVA: 100
bus: [29x13 double]
gen: [5x25 double]
branch: [40x13 double]
Running runpf() on this reduced case works OK for the contingencies you
list.
--
Jose L. Marin
Gridquant España SL
Grupo AIA
On Fri, Oct 31, 2014 at 9:41 AM, ckbeee <ckb...@tce.edu> wrote:
>
> Dear Dr.Zimmerman,
>
> When I perform the power flow for the following contingency in
> case_ieee30.m system, MATPOWER experiences numerical instability.
>
> 1. Line number 13 (Connected between buses 9-11)
> 2. Line number 16 (Connected between buses 13-12)
> 3. Line number 34 (Connected between buses 25-26)
>
> It means no solution exist for these contingencies. It does not give
> results for OPF also.
>
> Thanks in advance.
>
> Regards,
> Babulal
> --
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> Department of Electrical and Electronics Engineering
> Thiagarajar College of Engineering.
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