How to get ranges for specific values of variables

Question

Hello, everyone！Now I have a problem about how to set ranges for specific values of a variable.

I have a variable “Cmatrix(t,x,conv) ” and “t,x,conv” are some sets. I need that Cmatrix(t,x,conv) ∈ [-1,1] only when conv ≠ 'Heat_pump' . And Cmatrix(t,x,conv) >1 only when conv = 'Heat_pump'.

How do I write this in the red box?

When I set a constraint to bound the “Cmatrix(t,x,conv) ”, there will be errors as “The solver CONOPT 4.1 cannot handle the ranged constraint Cmatrix_except_HP(1,Elec,CHP_engine) in mathematical program "Cost_minimization"; please define the middle term as a variable and add bounds.”

Can some kind person save me? Thank you so so so much! Wish you happy every day.

gdiepen · Accepted Answer

Wouldn’t it be an option to use the range attribute?

You could create a parameter cMatrix_lowerbound(conv) and parameter cMatrix_upperbound(conv) that have definition based on the equality to ‘Heat_pump’. In the cMatrix variable, you would then use these lowerbound and upperbound parameters in the range (if you open the wizard you will be able to select them)

xyr · Answer

Wouldn’t it be an option to use the range attribute?

You could create a parameter cMatrix_lowerbound(conv) and parameter cMatrix_upperbound(conv) that have definition based on the equality to ‘Heat_pump’. In the cMatrix variable, you would then use these lowerbound and upperbound parameters in the range (if you open the wizard you will be able to select them)

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