[Help-glpk] Re: GLPK Wikibook : Electricity markets page

[Harley Mackenzie]

You are of course correct about my sloppy notation - I shall fix it, as 
it was a bit late when I added this.

I dont believe that mathprog can do these kind of calculations as I did 
these in a spreadsheet in Openoffice that I would also like to add to 
the page [similar problem to adding images - how do you do this?]. 
However, others on the GLPK list who know mathprog much better than I 
may be able to help.

Does anyone know if it is possible to do the piecewise approximation in 
GMPL rather than externally?

For the tutorial it would be useful, but in more realistic models these 
calculations would probably be performed externally and input to the 
model as part of the separate data file.

Regards,

Harley

On 8/07/10 4:00 AM, Robbie Morrison wrote:
> Hello Harley
>
> Just briefly .. on your GLPK Wikibook page.
>
> Your notation is incorrect:
>
>    .. are quadratic of the form f(x) =  k x flow^2 ..
>
> It should be:
>
>       .. in the form f(flow) = k.flow^2 ..
>    or .. in the form f(I) = k.I^2 where I is the current and k is ..
>
> Also, I don't use MathProg, but can one not do calculations
> to find the piecewise approximation parameters for the
> I2R losses?  You can in C++.  :)
>
> best wishes
> Robbie
> ---
> Robbie Morrison
> PhD student -- policy-oriented energy system simulation
> Institute for Energy Engineering (IET)
> Technical University of Berlin (TU-Berlin), Germany
> University email (redirected) : address@hidden
> Webmail (preferred)           : address@hidden
> [from Webmail client]
>
>
>    

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