Dear All,
I have a question regarding load variation.It has been discussed and
explain a few times and Dr Carlos and has included the code as seen at the
bottom of this post;however, there is one ambiguous point in it.
Having a load profile in 24 hours as
6 hours (0.6 * peak load)
2 hours (1 peak load)
16 hours (0.8 peak load)
If i want to have a Power flow in 24 hours(?can we have power flow for a
period of time?) should I write the code as:
mpc = loadcase('case118');
define_constants;
Nominal_PD = mpc.bus(:, PD);
Nominal_QD = mpc.bus(:, QD):
mpc.bus(:, PD) = 0.6 * Nominal_PD;
mpc.bus(:, QD) = 0.6 * Nominal_QD;
mpc.bus(:, PD) = 1 * Nominal_PD;
mpc.bus(:, QD) = 1 * Nominal_QD;
mpc.bus(:, PD) = 0.8 * Nominal_PD;
mpc.bus(:, QD) = 0.8 * Nominal_QD;
results = runpf(mpc);
If yes, how different durations are considered ?(2 hours,6 hours,16 hours)
Thank you
Iman
-------------------------------
On Fri, May 18, 2012 at 9:01 PM, Carlos E Murillo-Sanchez <
[email protected]> wrote:
> There is a rather flexible utility in matpower for scaling loads. Type
> >> help scale_load
>
> at the matlab prompt for help on how to use it. Otherwise, if you just
> want to modify inflexible demand,
> you could do something like
>
> mpc = loadcase('case118');
> define_constants;
> Nominal_PD = mpc.bus(:, PD);
> Nominal_QD = mpc.bus(:, QG):
> for factor = 0.8:0.01:1.20
> mpc.bus(:, PD) = factor * Nominal_PD;
> mpc.bus(:, QD) = factor * Nominal_QD;
> results = runpf(mpc);
> % now insert code here to do whatever you want to do with the results
> your code....
> more code...
> end
>
> This scales inflexible demand in the system by a factor from 80% of
> nominal to 120% of nominal in 1% increments and runs a power flow; you
> could run also an optimal power flow using runopf() instead. The load is
> scaled maintaining a constant power factor.
>
>
>
>
>
> Hanie Sedghi wrote:
>
>> Dear Sir,
>>
>> I would like to have different voltage angle values at different times
>> for a structure. Let's say I want to have the same structure as case9, but
>> I want to know what are the values at different times. It is like
>> simulating a grid and taking samples at different times. For that I think I
>> need different demands. Then I checked the case file and thought I need to
>> put random Pg's in "gen" matrix. Am I right? Shall I generate random values
>> in [Pmin,Pmax] interval?
>> I have another question, in case9, for bus 1, Pg=0 while Pmin=10. Is it
>> correct? Can Pg be less than Pmin? In that case,what do we mean by Pmin?
>>
>> I would truly appreciate your help.
>>
>> Best,
>> Hanie
>>
>
>
>
--
Best regards
Iman
