Hi everyone,
I know it´s more a general question, but regarding the following
conversation from the archive, which results are correct?
The (Qf - Q)t or the ones obtained from the get_losses.m file?
I would have done it the same way as mohsen, just with the absolute
values, but now i´m somewhat unsure.
thank you
Simon
============================================================
Ray Zimmerman
Thu, 02 Sep 2010 13:45:38 -0400
If I recall correctly, MATPOWER reports the reactive losses in the series
portion of the transmission line not including the line charging elements. As
you noticed, including the line charging elements often makes the total
reactive power "loss" for a line negative.
--
Ray Zimmerman
Senior Research Associate
211 Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Aug 26, 2010, at 9:06 AM, mohsen rahmani wrote:
Dear all
I already implemented a power flow with Newton method. all my results are
equal to matpower except reactive power losses.
we can use various formulation for calculating reactive power losses the
simple one is:
Q(from-to)+Q(to-from)=Q(losses) but this formulation is not satisfied in
matpower results. what is the problem? for example for IEEE 30 bus system:
Branch Data |
================================================================================
Brnch From To From Bus Injection To Bus Injection
Loss (I^2 * Z)
# Bus Bus P (MW) Q (MVAr) P (MW) Q (MVAr) P (MW) Q
(MVAr)
----- ----- ----- -------- -------- -------- -------- --------
--------
1 1 2 10.89 -5.09 -10.86
2.17 0.026 0.08
2 1 3 15.08 4.09 -14.96
-5.57 0.127 0.48
in branch 1-2 the losses sholud be (-5.09)+(2.17 )= -2.92
in branch 1-3 the losses should be (4.09 )+(-5.57 )=-1.46
which are different from matpower results.
thanks for your help
Best Regards
Mohsen Rahmani
