Dear Prof. Last question, like we have represented dispatchable loads as negative generation, what about their cost functions?
I mean a & b for dispatchable loads will also be considered as negative? if yes this may result in overall negative cost function for the generation at a particular bus... thanks sir On Thu, Mar 21, 2013 at 1:35 PM, Ray Zimmerman <[email protected]> wrote: > 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** > > > -- 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**
