Dear all
I'm about to evaluate the effect of line nominal voltage on line
losses. I simply increase line connected bus voltages, run power flow, and
calculate losses. But, in spite of increasing voltage loss is constant in all
cases. I have developed a simple code for a 2 bus network. M-files are
attached. What is the problem? does nominal voltage change any thing?
function mpc = case2
%% MATPOWER Case Format : Version 2
mpc.version = '2';
%%----- Power Flow Data -----%%
%% system MVA base
mpc.baseMVA = 100;
%% bus data
% bus_i type Pd Qd Gs Bs area Vm Va baseKV
zone Vmax Vmin
mpc.bus = [
1 3 0 0 0 0 1 1 0
20 1 1.1 0.9;
2 1 100 100 0 0 1 1 0
20 1 1.1 0.9;
];
%% generator data
% bus Pg Qg Qmax Qmin Vg mBase status Pmax
Pmin Pc1 Pc2 Qc1min Qc1max Qc2min Qc2max ramp_agc ramp_10
ramp_30 ramp_q apf
mpc.gen = [
1 100 0 200 -200 1.00 100 1 500
0 0 0 0 0 0 0 0 0 0
0 0;
];
%% branch data
% fbus tbus r x b rateA rateB rateC ratio
angle status angmin angmax
mpc.branch = [
1 2 0.05 0.1 0.0 250 250 250 0
0 1 -360 360;
];
clc
define_constants;
mpc=loadcase('case2');
for Vn=1:1000;
mpc.bus(:,10)=Vn;
r=runpf(mpc,mpoption('OUT_ALL',0,'VERBOSE',0));
loss(Vn)=r.branch(1,PF)+r.branch(1,PT);
end
plot(loss)
