Hi Ray, thanks for your input.
In fact, we weren't considering that. However:
When analyzing the case_info we get:
Shunt Injections
active (MW) -0.1
reactive (MVAr) 3.6
I'm assuming that those are simplified values, but in our network, we have:
Sum of the GS Shunt Conductances = *0.0865 MW*
Difference between calculated losses vs. get_losses = *0.095 MW *(that
were supposedly due to the missing GS values)
Resulting a difference of *0.0085 MW *(even this is different from the
*-0.1 MW* active shunt injections).
INESC TEC
*José Paulos*
Centro de Sistemas de Energia
Centre for Power and Energy Systems
*INESC TEC*
Campus da FEUP
Rua Dr Roberto Frias
4200-465 Porto
Portugal
T +351 91 424 1519
F +351 22 209 4050
[email protected] <mailto:[email protected]>
www.inesctec.pt <http://www.inesctec.pt>
On 27-Nov-18 20:03, Ray Zimmerman wrote:
You are missing contribution of the shunt elements defined in the GS
and BS columns of the bus matrix. These also contribute to the overall
power balance. Have a look at …
case_info(powerflow)
… after running your test_file.
Ray
On Nov 27, 2018, at 11:53 AM, José Paulos <[email protected]
<mailto:[email protected]>> wrote:
Hi,
We have a network with the following configuration:
*%% system MVA base*
mpc.baseMVA = 100;
*%% system voltage levels (kV)*
mpc.V_levels = [
0.4 15.0 30.0 60.0
];
*%% system summary*
% number of buses: 41 (1 REF | 1 PV)
% number of branches: 41 (8 transformers)
% number of loads: 21 (including Pd/Qd = 0)
% number of generators: 2
% number of capacitors: 2
We use get_lossses, in this case:
%%% *compute the losses*
losses = get_losses(powerflow);
%%% *the active losses*
active_losses = sum(abs(real(losses)));
The balance between the injected active power and the Loads/Gen's is
not equal to the result of the get_lossses procedure described.
Follows attached the case (run test_file.m with test_network.mat in
the same dir)
Thanks in advance,
--
INESC TEC
*José Paulos*
Centro de Sistemas de Energia
Centre for Power and Energy Systems
*INESC TEC*
Campus da FEUP
Rua Dr Roberto Frias
4200-465 Porto
Portugal
T +351 91 424 1519
F +351 22 209 4050
[email protected] <mailto:[email protected]>
www.inesctec.pt <http://www.inesctec.pt/>
<test_file.m><test_network.mat>
