Search found 20 matches

by anan
3 months ago
Forum: Modeling
Topic: modeling solar irradiance
Replies: 0
Views: 552

modeling solar irradiance

dear all,

I'm trying to model solar irradiance using Beta distribution any ideas to do that?

thank you,
Anan
by anan
6 months ago
Forum: Modeling
Topic: random variable in gams
Replies: 3
Views: 804

Re: random variable in gams

Dear A.Sen ,
thank you for the attached example I would like to ask you if possible can you help me to generate random variable with Beta distribution?

thank you.
by anan
6 months ago
Forum: Modeling
Topic: random variable in gams
Replies: 3
Views: 804

Re: random variable in gams

thank you for your help

I was trying to use chance constraint with one random variable but the equation is indexed on time there is a problem in chance constraint equation can you help me?
by anan
6 months ago
Forum: Modeling
Topic: random variable in gams
Replies: 3
Views: 804

random variable in gams

hello,
I would like to ask how to model a random variable with discrete probabilities in gams?
I used emp before to model the chance constraint but I would like to ask if there is any other ways to model it without emp?

thank you,
ANAN
by anan
7 months ago
Forum: Syntax
Topic: ccreform
Replies: 0
Views: 604

ccreform

hello,

any one can help me how to use ccreform or what is the syntax to specify that i want to use chull or bigM?

thank you.
by anan
7 months ago
Forum: Syntax
Topic: random variable in gams
Replies: 0
Views: 591

random variable in gams

hello, I have a random variable following a probability distribution and its an input variable to the equation how can I model it in gams should I use (randvar)? is it possible to use randvar without EMP? waterhead(Hy,t,bus)$Bushy(bus,Hy) .. head(Hy,t)=e= datahy(Hy,'h0')+lw(hy,t); hydro_output(Hy,t,...
by anan
7 months ago
Forum: Solvers
Topic: Deterministic equivalent
Replies: 0
Views: 543

Deterministic equivalent

dear all, I would like to ask about this function in GAMS (option emp = de;) I'm modeling chance constraint using EMP but I need to use the deterministic equivalent does this function (option emp = de;) use the Big M to reform the chance constraint by itself or I have to reform the constraint then u...
by anan
7 months ago
Forum: Modeling
Topic: neative values problem
Replies: 2
Views: 446

Re: neative values problem

thank you so much for your reply this was helpful to understand how GAMS deal with the equations
by anan
7 months ago
Forum: Modeling
Topic: neative values problem
Replies: 2
Views: 446

neative values problem

I would like to ask if anyone can help me to find out why the equation values are negative and the variable values are positive the equation name is hydro_output and variable ph * this code for 6-bus system considering the line constraints with one hydro unit and one thermal unit Set t 'time' / t1*t...
by anan
7 months ago
Forum: Modeling
Topic: chance constraint
Replies: 0
Views: 430

chance constraint

dear all, please help me with this code why is it infeasible?? what is the problem with random variable Q or the equation hydro_output?? * this code for 6-bus system considering the line constraints with one hydro unit and one thermal unit Set t 'time' / t1*t24 / i 'generators indices' / g1*g3 / k '...