For multiple generators and dispatchable loads at a bus, you simply have multiple injections, let's call them p1, p2, …, pn, and each has a cost f1(p1), f2(p2), … fn(pn). To get the aggregate cost function you simply add everything together. Let p = p1+ p2 + … + pn be the aggregate injection and f(p) = f1(p1) + f2(p2) + ... + fn(pn) be the total cost function.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Mar 21, 2013, at 3:20 AM, Aman Bansal <[email protected]> wrote: > Prof. Zimmerman > > But in case when a generator and a price sensitive load lie on same bus, then > if we denote price sensitive load as negative of generation, then what is the > effective cost function at that bus is both generator and dispatchable load > have different cost functions..... > > On Wed, Mar 20, 2013 at 8:16 PM, Ray Zimmerman <[email protected]> wrote: > You can still easily create a matrix that corresponds to only the real > generators (dimension 6 in your example). There is a lot of internal code > that does something like … > > ig = find(~isload(mpc.gen)); > > … and then uses ig to index the generator and gencost matrices to get info > only for the real generators. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Mar 20, 2013, at 2:54 AM, Aman Bansal <[email protected]> wrote: > >> Hello Prof. Zimmerman >> >> >> >> I just realized from the manual that dispatchable or price-sensitive loads >> are modelled as negative real power injections with associated costs. But if >> we represent them as generators instead of loads (which they are actually), >> the flow participation matrix (that is obtained from power tracing) get >> affected. Like consider we have 6 gencos in problem and there are 5 price >> sensitive loads, then generator participation matrix would become 11*x >> instead of 6*x. >> >> How to deal with this?? >> >> please enlighten me >> >> >> >> >> >> >> -- >> Aman Bansal, >> M.Tech. Student (Power Systems) >> Indian Institute of Technology (BHU) >> Varanasi >> Cell No. +91-841-799-9350 >> >> *The smallest good deed is better than the grandest good intention* > > > > > -- > Aman Bansal, > M.Tech. Student (Power Systems) > Indian Institute of Technology (BHU) > Varanasi > Cell No. +91-912-569-8850, 841-799-9350 > > *The smallest good deed is better than the grandest good intention*
