Dear Sir Is there any need to scale down the demand functions for dispatchable loads i.e. divide c and d by maximum dispatchable load and then add their negatives to respective cost functions of generators (a and b) that lie on same bus?
AMAN On Mon, Mar 25, 2013 at 6:33 PM, Aman Bansal <[email protected]>wrote: > Thank you Prof !! > > > On Mon, Mar 25, 2013 at 7:51 AM, Ray Zimmerman <[email protected]> wrote: > >> The total cost for a dispatchable load is negative … the marginal cost is >> positive. But, yes, the overall cost of "generation" at a bus could be >> negative if you are adding together the costs of actual generators and >> dispatchable loads. In fact, the total "cost" is now the negative of the >> net benefit, so it could be a very large negative number. >> >> -- >> Ray Zimmerman >> Senior Research Associate >> 419A Warren Hall, Cornell University, Ithaca, NY 14853 >> phone: (607) 255-9645 >> >> >> >> >> On Mar 22, 2013, at 12:30 AM, Aman Bansal <[email protected]> >> wrote: >> >> 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** >> >> >> > > > -- > 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. +91-841-799-9350 **The smallest good deed is better than the grandest good intention**
