Oh ... well ... the number of hours is an input value. The default is 1 hour (see help runmarket). Ok, I have actually gone back and looked at some examples, and, I do not see the difference in sign that you are referring to. In my examples, the cost for generators is positive and for dispatchable loads it is negative (as expected) for both ways of computing it.
Can you give me an example where they are different for me to look into? -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Mar 26, 2012, at 11:44 AM, Roberto Carvalini wrote: > I didn't want to clarify. I wanted to ask you what is the reason? > > How you have determined the number of hours and why for the first one is > negative and for the second one is positive. I don't understand. If it is > possible, please explain. > > 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 > >
