Dear Dr Ray,
I am trying to find out what will happen if I have excessive reactive power
supply on a 3 bus network.
I did that by forcing synchronous generator to have max and min VAR supply of
100 MVAR.
When I do that, I expect bus voltages to increase (done by relaxing bus voltage
limits). However, from MATPOWER simulation shows me that bus voltages drop
instead.
Could you please explain why this is happening? I attached here are my network
data. Thanks in advance.
%% bus data
% bus_i type Pd Qd Gs Bs area Vm Va baseKV zone Vmax Vmin
mpc.bus = [
1 2 0 0 0 0 1 1 0 230
1 5 0
2 2 0 0 0 0 1 1 0 230 1 5
0
3 3 0 0 0 0 1 1 0 230 1 5
0
];
%% generator data
% bus Pg Qg Qmax Qmin Vg mBase status Pmax Pmin
mpc.gen = [
1 0 0 100 0 1.00 100 1 400
0
2 0 0 50 0 1.00 100 1 200
0
2 0 0 50 0 1.00 100 1 200
0
3 0 0 100 100 1.00 100 1 0
0 % SG
2 0 0 0 -20 1.00 100 1 0
-100 % Dispatchable load
3 0 0 0 -33 1.00 100 1 0
-165 % Dispatchable load
];
%% branch data
% fbus tbus r x b rateA rateB rateC ratio angle
status angmin angmax
mpc.branch = [
1 3 0.0342 0.180 0.0106*2 150 85 85
0 0 1 -360 360
1 2 0.0912 0.480 0.0282*2 100 85 85
0 0 1 -360 360
2 3 0.1140 0.600 0.0352*2 200 71 71
0 0 1 -360 360
1 3 0.0342 0.180 0.0106*2 150 85 85
0 0 1 -360 360
1 2 0.0912 0.480 0.0282*2 100 85 85
0 0 1 -360 360
2 3 0.1140 0.600 0.0352*2 200 71 71
0 0 1 -360 360
];
%% generator cost data
% model Startup Cost Shutdown Cost Coefficient number Coefficient
mpc.gencost = [
2 10 0 3 10 100
1000
2 10 0 3 2.5 5
10
2 10 0 3 2.5 5
10
2 10 0 3 0 0
0 % SG
2 10 0 2 5000 2500
0 % Dispatchable load
2 10 0 2 5000 2500
0 % Dispatchable load
];
Yours sincerely,
Jiashen Teh
PhD Student
Electrical Energy & Power Systems Group, School of Electrical & Electronic
Engineering
Ferranti Building (B18), The University of Manchester, M13 9PL, United Kingdom
Tel: +44 (0) 161 306 2263; Mobile: +44 (0) 792 322 4864
