Hi Ray, Thank you so much for your response.
Best regards, 2017-05-25 14:44 GMT-05:00 Ray Zimmerman <[email protected]>: > Hi Johan, > > Ok, this one had me scratching my head for while, but I finally figured it > out. > > First, the dispatchable load introduces a large negative offset to the > objective function value. This offset is constant if there is no load > shedding, which is the case for both Example 5a and 5b. > > Second, regarding the decrease in the objective function value when > ramping costs are introduced, It turns out that the objective function > value being reported is not the value of the full objective function as > described in the manual, but rather the value of the objective function of > the QP problem passed to the QP solver. When adding quadratic ramping > costs, it turns out the cost of ramping from a specified InitialPg > includes a constant term which is not included in the objective for the QP > problem being solved. That constant term is available in mdo.QP.c1 and > you can add it to mdo.QP.f to get the value of the objective function for > the full problem. > > This value does increase as expected when adding the ramping cost. > > I have modified most_summary() > <http://www.pserc.cornell.edu/matpower/docs/ref/matpower6.0/most/most_summary.html> > to > report the full objective function value. You can get the new version from > the MOST GitHub repository <https://github.com/MATPOWER/most>. I will > pull those changes into the MATPOWER GitHub repository > <https://github.com/MATPOWER/matpower> soon. > > Ray > > > On May 18, 2017, at 11:41 AM, Johan Samir Obando Ceron < > [email protected]> wrote: > > > Hi every one, > > > I am working on MOST 1.0 the example 5 “Deterministic Multiperiod OPF”. I > don’t understand why the value of objective function of the example 5a is > bigger than the example 5b that includes the wear and tear ramping costs? > > > On the other hand, when I run the example 5b the cost generation is bigger > than the value of objective function, why? > > > Thanks for your support. > > > Kind Regard > > Johan Samir Obando > -- > > > *Johan Samir Obando Ceron. Ing.* > Joven Investigador > Direccion de Investigacion y Desarrollo Tecnologico > Universidad Autónoma de Occidente > Cali, Colombia > Tel (572) 3188000 Ext11831 > e-mail: [email protected] > > > > -- *Johan Samir Obando Ceron. Ing.* Joven Investigador Direccion de Investigacion y Desarrollo Tecnologico Universidad Autónoma de Occidente Cali, Colombia Tel (572) 3188000 Ext11831 e-mail: [email protected]
