If you want to model a load as a constant impedance, with the nominal MW occurring at 1 p.u. voltage, simply move the values from the PD and QD columns to the GS and BS columns and change the sign of the BS column.
In your example below, your GS and BS columns are still zero. -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Apr 5, 2013, at 1:56 PM, Cansu Yildirim <[email protected]> wrote: > Dear Dr. Zimmerman, Dear all, > > I want to model loads as shunt elements. How can I get the shunt conductance > Gs? I think I’m missing something when I use the equation > Gs=(P/baseMVA)/(V^2) > For the voltage I defined V=1 p.u. Below you can see my example. I would be > grateful for any help. Thanks in advance! > > Best regards, > > Cansu Yildirim > > > > > %% bus data > % bus_i type Pd Qd Gs Bs area Vm Va baseKV > zone Vmax Vmin > mpc.bus = [ > 1 1 0 0 0 0 1 1 0 345 1 1.1 0.9; > 2 1 20 10 0 0 1 1 0 345 1 1.1 0.9; > 3 1 0 0 0 0 1 1 0 345 1 1.1 0.9; > 4 1 0 0 0 0 1 1 0 345 1 1.1 0.9; > 5 1 40 15 0 0 1 1 0 345 1 1.1 0.9; > 6 1 30 10 0 0 1 1 0 345 1 1.1 0.9; > 7 1 0 0 0 0 1 1 0 345 1 1.1 0.9; > 8 1 0 0 0 0 1 1 0 345 1 1.1 0.9; > 9 1 0 0 0 0 1 1 0 345 1 1.1 0.9; > 10 3 0 0 0 0 1 1 0 345 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 = [ > 10 0 0 1 1 1 100 1 1 1 0 0 0 0 0 > 0 0 0 0 0 0; > 7 10 5 1 1 1 100 1 1 1 0 0 0 0 > 0 0 0 0 0 0 0; > 8 30 20 1 1 1 100 1 1 1 0 0 0 0 > 0 0 0 0 0 0 0; > 9 20 10 1 1 1 100 1 1 1 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 0.2 0 0 0 0 0 0 1 -360 360; > 2 3 0.1 0.5 0 0 0 0 0 0 1 -360 360; > 3 4 0.2 0.8 0 0 0 0 0 0 0 -360 360; > 4 5 0.1 0.3 0 0 0 0 0 0 1 -360 360; > 5 6 0.2 0.4 0 0 0 0 0 0 1 -360 360; > 6 1 0.1 0.15 0 0 0 0 0 0 1 -360 360; > 2 5 0.2 0.5 0 0 0 0 0 0 1 -360 360; > 10 1 0 0.004 0 0 0 0 0 0 1 -360 360; > 7 2 0 1.56 0 0 0 0 0 0 1 -360 360; > 8 3 0 0.5 0 0 0 0 0 0 1 -360 360; > 9 4 0 0.4 0 0 0 0 0 0 1 -360 360; > ];
