Have you simply tried it? I can’t think of any reason that a negative output from the slack bus should cause problems.
Ray > On Mar 20, 2015, at 1:32 PM, angelina sirri <[email protected]> wrote: > > Dear all, > > I am trying to simulate active network management in distribution network in > 11kv. I have a distribution network with 40 nodes. Of those, one node is the > distribution substation node, which is also the slack bus, and also I have in > another node a wind farm.The rest of the nodes are loads. > For the cases that I have a low demand and a wind power output higher than > that, I would like to let the wind farm inject that power back to the main > network (which I do not neither include in the mpc. case , nor simulate). > For example, let's say that I have the following: > sum(mpc.bus(:,3))=5MW; %total active demand > sum(mpc.bus(:,4))=4MVar; %total reactive demand > > mpc.gen(slack bus,9)=20MW; %maximum slack bus output > mpc.gen(wind_farm,9)=10MW; %maximum wind power output > > So in this case, the wind farm is able to feed the rest of the network, with > zero power taken from the slack bus (if with opf, wind generator is cheaper > than the slack). > How could I feed the remaining 5MW (10-5) from the wind farm back to the > grid, getting in the results sth like: > results.gen(slack bus,2)=-5MW? > > I guess that I will have voltage issues, but in first place I was wandering > how this could happen in case I do not have voltage issues. Afterwards, to > face the voltage issues I was thinking to manually change the tap of the > transformer behind the slack like that: > > mpc.branch(branch of the transformer 33/11kv, 9) = range between 0 to 1; > > Any proposal would really help!! > Kind Regards, > Angelina
