Hi Ray I checked both possible reasons and I still have the same problem. It is weird that even though I increase the load capacity by 20%, 30% and 50% on per unit I still having the same value of dispatchable loading i.e. 1025.5 [MW] somehow there is something fixing this value of dispatchable load as a maximum. Additionally I played around with the costs to see their impact in the dispatchable loads and as I mentioned before this value remains the same 1025.5 [MW]. If I decrease my load this value decreases as well, so I believe there is something fixing this value as a maximum dispatchable load regardless the increasing in load.
I Hope you could understand, sorry for my writing. Thanks, Carlos 2015-05-06 16:22 GMT+01:00 Ray Zimmerman <[email protected]>: > Ok, so you are seeing some load being curtailed when you expected that > none of it would be? I can think of two possible reasons … > > (1) there are network constraints (branch flow limits) that do not allow > all of the load to be served, or > (2) the value of the load does not exceed the cost of the generation > required to serve it. > > You can check the first by trying a case with no line constraints > (mpc.branch(:, > RATE_A) = 0) to see if that eliminates the curtailment. And you can > verify the second by double-checking your generator and load “costs” in the > gencost matrix. If you are using a very high price for the loads, you > should also see a corresponding price at any buses where curtailment is > happing. > > Ray > > > On May 6, 2015, at 11:07 AM, Carlos Cruzat Hermosilla <[email protected]> > wrote: > > Hi > > Well I am not having trouble specifying the loads as dispatchable. However > as can you see from the System Summary just 1025.5 of 2296.2 [MW], which > is the total load is dispatchable, so a few loads are dispatched at values > less than their nominal value. > > I hope this could clarify my question. > > Thanks > Carlos > > > > ================================================================================ > | System Summary > | > > ================================================================================ > > How many? How much? P (MW) Q (MVAr) > --------------------- ------------------- ------------- > ----------------- > Buses 24 Total Gen Capacity 5107.5 -535.0 to > 2664.0 > Generators 33 On-line Capacity 5107.5 -535.0 to > 2664.0 > Committed Gens 33 Generation (actual) 1036.0 -124.1 > Loads 17 Load 1025.5 208.5 > Fixed 0 Fixed 0.0 0.0 > Dispatchable 17 Dispatchable 1025.5 of 2296.2 208.5 > Shunts 1 Shunt (inj) -0.0 -108.4 > Branches 38 Losses (I^2 * Z) 10.53 96.82 > Transformers 5 Branch Charging (inj) - 537.7 > Inter-ties 10 Total Inter-tie Flow 602.1 267.0 > Areas 4 > > 2015-05-06 15:54 GMT+01:00 Ray Zimmerman <[email protected]>: > >> We will need more information. What do you mean by “one part of the load >> becomes dispatchable”? Are you saying that you are having trouble >> specifying your loads as dispatchable or that only a few loads are >> dispatched at values less than their nominal value? Or that the loads that >> are curtailed are only partially curtailed? >> >> We need to know what specifically you expected to see and how your result >> differs from that. >> >> Ray >> >> >> > On May 6, 2015, at 10:11 AM, Carlos Cruzat Hermosilla < >> [email protected]> wrote: >> > >> > Hi All >> > >> > I am currently working with dispatchable loads in order to see the >> impact of overloading the lines of the network. However when I run OPF just >> one part of the total load becomes dispatchable which obviously affects my >> results, so Does anybody knows what could be the reason? >> > >> > Thanks, >> > Carlos >> > >> > PD: The generation and lines capacities are enough to provide the >> required energy. >> >> >> >> > >
