Dear Jovan and Sarmad, I agree with your comments about LMP. In this analysis I’m not considered the congestion. If the generation inequality constraints aren’t active, Matpower prints this information correctly, and It’s possible to realize different prices when the lines is congested. Sarmad, I’ve verified your idea. Despite the fact that the shadow price for the minimum or maximum is active, the LMP shown are the same for all buses.
My question is about why LMP doesn’t include the Lagrange multipliers related to generation inequality constraints. I did a model using the dual problem for the DCOPF, and I realized that dual constraints are the prices for each buses. It’s very clear in those constraints that those “prices” take into account the marginal cost, the congestion cost through the partial transmission distribution factors (PTDF) and the generation constraints. In the technical literature for the DCOPF (losses are neglected), the LPM are modeled considering energy cost and congestion cost. However, in the book “Spot pricing of electricity” from F. Schweppe et all, authors include these shadow prices in order to compute the spot prices. I’d like to know your feedback about these comments. Regards, Vh De: bounce-119912654-12657...@list.cornell.edu [mailto:bounce-119912654-12657...@list.cornell.edu] En nombre de Jovan Ilic Enviado el: jueves, 19 de noviembre de 2015 1:13 Para: MATPOWER discussion forum Asunto: Re: Question about LMP Dear Victor, If there is no congestion in the network, there is the same LMP at all the nodes. The LMP consists of loss, congestion, and energy costs. DCOPF has no losses, and if there is no congestion only the energy cost is accounted for. You can think of it as if since there is no congestion or loss cost the energy can be distributed to all nodes at the same price. Regards, Jovan Ilic On Wed, Nov 18, 2015 at 4:37 PM, Victor Hugo Hinojosa M. <victor.hinoj...@usm.cl> wrote: Dear Prof. Zimmerman, I have a question about Local Marginal Prices (LMP) that are shown in Matpower. The definition of the LMP is the marginal cost of supplying, at least cost, the next increment of electric demand at a specific location (node) on the electric power network, taking into account both supply (generation/import) bids and demand (load/export) offers and the physical aspects of the transmission system including transmission and other operational constraints. When it is performed a DCOPF, Matpower shows LMP for each bus considering the marginal cost (energy cost) and the congestion cost so that I'd like to know why the generation constraints (maximum and minimum power) aren't considered in the LMP. Thank you so much for your ideas and comments. Regards, Vh
