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[Help-glpk] Re: GLPK Wikibook : Electricity markets page
From: |
Harley Mackenzie |
Subject: |
[Help-glpk] Re: GLPK Wikibook : Electricity markets page |
Date: |
Thu, 08 Jul 2010 12:00:45 +1000 |
User-agent: |
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.10) Gecko/20100512 Thunderbird/3.0.5 |
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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