Hello Asma, Your description is not very clear, so let me ask you a couple of things first:
- You seem to be saying that your generators should have P=8 MW. That's fine, but then you total load should be balanced according to that (is it?). Otherwise the imbalance, which has to be picked up by the slack bus, could render the case infeasible. - You also seem to be saying that all your generators are PQ type. A case with no PV buses is quite prone to numerical ill-conditioning (unless the total number of buses is low). Worse yet, if all gens have Q=0 then all reactive power will have to be provided by the slack, and then voltages will quickly drop as you move away from the slack bus. And if the network topology is dominantly radial, things are even worse yet. Maybe we can help you faster if you could share your case file here. -- Jose L. Marin Grupo AIA 2018-05-18 17:31 GMT+02:00 Asma DABBABI <[email protected]>: > the library Matpower works perfectly with small wind farms (30 wind > turbines with > 3 mw each, the turbines are represented as PQnode with P=3MW and Q=0MVAR > and i have one slack bus in the terrestrial network) > but when I tried to make an example of a larger farm such as Borsselle > Park (100 wind turbines of 8 mw each) I had a divergence of the system. > > "Newton's method power flow did not converge in 10 iterations ", > I looked on the internet and I found that in this case we have to do a > continuation power flow that gradually increases the loading/generation > like this: > > {define_constants; > mpcbase = loadcase ('casefile'); > mpcbase.bus (:, PD) = 0; > mpcbase.bus (:, QD) = 0; > mpcbase.gen (:, PG) = 0; > mpctarget = loadcase ('casefile'); > results = runcpf (mpcbase, mpctarget); > results.cpf.max_lam} > > If the resulting value of results is greater than 1, it indicates that the > load for the box is greater than that of the loading and unloading system > at least by a factor of results.cpf.max_lam to get a convergent power flow > solution. > I tried this and actually I found that it shows that results.cpf.max_lam > is less than 1 so i must reduce the loads to 1.35 mw for each turbine. > in my case i don't need to reduce the loads, i must found the losses of > the network with 8mw for each turbine. > I've tried many solutions that i found in matpower page but until now I > have not found the right solution to calculate with 8 mw. > > So can you help me please on that, I 'll be so grateful if you answer me. > > Best regards, > > > >
