Can you give me an example of the costs you are using for your dispatchable loads? Are they all identical? (feel free to send me your case file off-list)
Ray > On May 6, 2015, at 1:19 PM, Carlos Cruzat Hermosilla <[email protected]> > wrote: > > 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] > <mailto:[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] >> <mailto:[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] >> <mailto:[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] >> > <mailto:[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. >> >> >> >> > >
