Ok, thanks for that clarification. I'd forgotten about that difference. -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645
On Mar 26, 2012, at 11:31 AM, Roberto Carvalini wrote: > > Dear Dr. Ray, > > With regards to second question, for the generators these two costs are the > same while for the dispatchahble loads are different. The first one gets the > negative value for dispatchable loads. > > Best Wishes > > Roberto > > > On Mon, Mar 26, 2012 at 14:59, Ray Zimmerman <[email protected]> wrote: > On Mar 24, 2012, at 10:56 PM, Roberto Carvalini wrote: > >> 1. When I do a runmarket, in the results, what is the difference between >> PRICE in MARKET SUMMARY and LAMBDA in System summary? Usually they have the >> same value and sometimes they are different? What is the reason? > > PRICE depends on the auction type chosen. For a first price auction, they > should be the same except in cases where a generator is dispatched at PMIN, > in which case the LAMBDA may go lower than the offer price, but the cleared > price is still set to the offer price. See MATPOWER Tech Note 1 on Uniform > Price Auctions and Optimal Power Flow for more details. > > >> 2. According to your reply to one of the posts as follows, what is the >> difference between these two costs? They get different values? >> >> cost = totcost(r.gencost, r.gen(:, PG)); >> cost = dispatch(:, FCOST) + dispatch(:, VCOST); > > The first is a cost in $/hr. The second is multiplied by the number of hours > in a market period (mkt.t) and so is expressed in $. For the default of 1 > hour periods, they should give the same number. > > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > >
