My guess is that you have bus 9 set as a PV bus and hence it's voltage magnitude is constant.
Shri On Feb 19, 2015, at 4:47 AM, "david clerc" <[email protected]<mailto:[email protected]>> wrote: Hello everyone, First I apologize for my approximate english. I am working on a student project : I have to incorporate a DC transmission line on an AC grid. In order to do that, I use the "dcline" matrix already present in matpower. Now, I want to observe the continuation power flow of the grid at a bus, when this bus is only linked to the grid by a DC line. I have tried that on a little modified case9_dcline. The resulting curve wasn't a nose curve as I expected, it is more like a horizontal straight line, the points make an round trip. (I include an image in my mail but I'm not sure you will see it) <cpf plot.PNG> cpd with AC line (bottom) with DC line (up) I think that this result is wrong, and I suppose it s because of the reactive injection used to model the DC transmission line. I tried to limit the reactive injection with "mpoption('pf.enforce_q_lims', 1);" but the curve was the same ! What do you think about it? If I'm right about the reactive injection problem, what can I do to observe the real sensibility of my bus ? Is there another way to do it ? I would very much appreciate any advice. Kind Regards, David
