Thanks Gang for your answer. This confirms my thoughts because it is
written I^2*Z above losses. Therefore, these losses are power loss in
the series portion of the pi-model of the transmission line.
However, in an OPF problem where the objective is to minimize reactive
power transmission losses, reactive losses are computed taking into
account both portions of the transmission line (i.e. line charging
capacitance portions of the pi-model are also included). So what is the
goal of calculating losses in matpower including only the series
portion? Is there any advantages of doing so?
Regards
Houssem
On 03/04/2016 11:59 PM, Gang Huang wrote:
Dear Houssem,
Please note that transmission lines have charging susceptance (i.e.,
mpc.branch(:, BR_B)), and its contribution to the reactive power is
not listed in the pretty-printed output.
Best regards,
Gang
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Houssem
*Sent:* Sunday, April 03, 2016 11:29 AM
*To:* MATPOWER discussion forum
*Subject:* question about losses
Dear All
I have a small question about losses in matpower .
I have run a small program with 3 buses in matpower 4.1.
The obtained results are:
================================================================================
| 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 2 179.33 116.79 -170.96
-102.71 8.369 16.74
*2 1 3 39.03 20.69 -38.85
-22.98 0.183 0.55*
3 2 3 -229.04 -147.29 238.85 166.92
9.813 19.63
-------- --------
Total: 18.365 36.91
my question is, in line 2 Qlosses should be (20.69)+(-22.98) =-2.29
MVar. However matpower displays 0.55MVar !!! is there any explanation
to that?
same for branch 1.
Regards
Houssem
