Does it mean that my model is wrong

GAMS
1

I try to solve an electric power problem. Rated power of windgenerators some times has negative value (so takes zero, because is positive quantity). I would like to ask if it is logic or something goes wrong.

thanks a lot

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2

Can you elaborate your question? Are you talking about the output from a wind generator or the rating of the machine? The rating of a generator is normally a parameter, but the output from a wind power plant would be a variable and can be zero.



From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of saosan
Sent: 8. august 2013 13:45
To: gamsworld@googlegroups.com
Subject: Does it mean that my model is wrong



I try to solve an electric power problem. Rated power of windgenerators some times has negative value (so takes zero, because is positive quantity). I would like to ask if it is logic or something goes wrong.



thanks a lot

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3

Hi saosan
Please read the guidelines for this forum carefully and add all the missing information accordingly.
Cheers
Renger

Sent from my iPhone

Am 08.08.2013 um 13:47 schrieb “saosan” :

I try to solve an electric power problem. Rated power of windgenerators some times has negative value (so takes zero, because is positive quantity). I would like to ask if it is logic or something goes wrong.

thanks a lot

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4

Τη Πέμπτη, 8 Αυγούστου 2013 2:58:40 μ.μ. UTC+3, ο χρήστης Yonas Gebrekiros έγραψε:

Can you elaborate your question? Are you talking about the output from a wind generator or the rating of the machine? The rating of a generator is normally a parameter, but the output from a wind power plant would be a variable and can be zero.



From: gams...@googlegroups.com [mailto:gams...@googlegroups.com] On Behalf Of saosan
Sent: 8. august 2013 13:45
To: gams...@googlegroups.com
Subject: Does it mean that my model is wrong



I try to solve an electric power problem. Rated power of windgenerators some times has negative value (so takes zero, because is positive quantity). I would like to ask if it is logic or something goes wrong.



thanks a lot

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To be more specific. I want to calculate the rated power of a wind generator. When i solve this problem at the Pdg variable Gams give to me some results. For example the best answer is to connect to 4 bus one wind generator with Pdg=1.76 kW. At buses 2,3 gives me level result is zero but in marginal area gives me negative numbers. Is this wrong? From what I know level area gives you optimal solution and marginal values ignored.

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5

I believe that I fund the solution. Marginal values describes you how the optimal variable will change (this number is marginal value) if this variable rise up by 1.

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