Dear Ray,
The t_get losses file and the get_loss files calculate losses
at each line. I need to calculate the losses for every bus what are the
changes I need to do?
On 21 Jan 2015 20:25, "nivedita arunachalam" <[email protected]>
wrote:
> Thank you very much Ray, that your reply is detailed. I will work with it
> and let you know the results.
> On 21 Jan 2015 20:20, "Ray Zimmerman" <[email protected]> wrote:
>
>> 1. The get_losses function itself is pretty clearly documented (see
>> Section 9.2.4 in the User’s Manual
>> <http://www.pserc.cornell.edu/matpower/manual.pdf>) so hopefully there’s
>> no confusion there. The LSF calculations in t/t_get_losses.m are
>> specific to the power flow, not the OPF, in that they assume fixed
>> generator voltages and a specific slack bus, etc.
>>
>> 2. There should be no difference, simply that get_losses() is more
>> convenient than pulling code out of printpf() to compute it yourself.
>>
>> 3. In t/t_get_losses.m I compute the loss sensitivities numerically, by
>> doing small (epsilon) perturbations of the load at each bus and recording
>> the corresponding proportional change in losses. That’s what a “sensitivity
>> factor” means. Then I compare this LSF matrix computed by numerical
>> perturbation with the one I computed analytically to test that the latter
>> is correct.
>>
>> Ray
>>
>>
>> On Jan 20, 2015, at 12:22 PM, nivedita arunachalam <
>> [email protected]> wrote:
>>
>> Dear Ray,
>> I have some doubts regarding the loss sensitivity factor
>> calculations you sent me.
>> 1. Is it for opf calculation alone?
>> 2. I work with normal runpf operations and I get power loss by calling
>> them from printpf (sum(real losses)). Then what is the difference in your
>> get loss file and direct values.
>> 3. Why do you use epsilon values in lsf caculation, what formula does it
>> represents?
>>
>> Kindly reply me...
>>
>>
>>
