MATPOWER does not return this information explicitly (though it does print it
if the verbose option is on. However, you can find it by comparing the BUS_TYPE
column of the bus matrix before and after solving the power flow.
>> mpc = loadcase('case118');
>> results = runpf(mpc, mpopt);
MATPOWER Version 6.0-dev, 14-Mar-2016 -- AC Power Flow (Newton)
Newton's method power flow converged in 3 iterations.
Gen 46 at upper Q limit, converting to PQ bus
Gen 9 at lower Q limit, converting to PQ bus
Gen 15 at lower Q limit, converting to PQ bus
Gen 16 at lower Q limit, converting to PQ bus
Gen 43 at lower Q limit, converting to PQ bus
Gen 48 at lower Q limit, converting to PQ bus
Newton's method power flow converged in 3 iterations.
>> k = find(mpc.bus(:, BUS_TYPE) == PV & results.bus(:, BUS_TYPE) == PQ);
>> mpc.bus(k, BUS_I)
ans =
19
32
34
92
103
105
Hope this helps,
Ray
> On Mar 24, 2016, at 11:59 AM, Bai, Wenlei <[email protected]> wrote:
>
> Hi Jose,
> Thanks for reminder. I didn’t know this option before. It solved my question.
> So how do we know which PV bus, is there is any, is converted to PQ bus after
> using ENFORCE_Q_LIMS option 1 or 2?
>
> Wenlei
>
> From: [email protected]
> <mailto:[email protected]>
> [mailto:[email protected]
> <mailto:[email protected]>] On Behalf Of Jose Luis
> Marin
> Sent: Thursday, March 24, 2016 3:57 AM
> To: MATPOWER discussion forum <[email protected]
> <mailto:[email protected]>>
> Subject: Re: PV bus generator reactive power exceeding limits
>
>
> Quick question, did you use the option pf.enforce_q_lims? (see Table C-2 in
> the manual)
>
> Also, be aware that options 1 and 2 may yield different solutions, in general.
>
> --
> Jose L. Marin
> Grupo AIA
>
>
>
> On Thu, Mar 24, 2016 at 6:08 AM, Bai, Wenlei <[email protected]
> <mailto:[email protected]>> wrote:
> Dear Ray,
> I’ve encountered a situation: the real power and voltage are specified in PV
> buses, and as I run the load flow on modified 30 bus case, somehow the
> reactive power of PV bus are exceeding the limits. Some even exceed the
> negative limits.
> The thing is the reactive power demand of the load and system isn’t large.
> Can you see what might be wrong?
>
> Blessings,
> Wenlei
