Constraint on Commodity IN to a set of Processes

[Samaneh]

Hello,

I have a problem to define user constraint for fuel consumption in a set of processes (vehicles):

I have 50 different gasoline cars (conventional, Hybrid, Plugin Hybrid, and existing gasoline vehicles)
All of these cars have 2 or 3 commodity in. For example, conventional, Hybrid, and existing cars have 2 fuels input (gasoline and ethanol) and Plugin Hybrid has 3 fuels input (gasoline, ethanol, and elec).
I don't want to specify a percent fuel share input for gasoline and ethanol for each vehicle. I want the model to figure that out instead. So, Would be possible to allow gasoline and ethanol as an input to all gasoline vehicles without specifying fuel share for each car, and then set a separate lower bound constraint that requires total ethanol consumption from all gasoline cars to be x% of total gasoline consumption from all gasoline vehicles, where x increases over time?
I tried that with UC_COMCON but it didn't work. I just wonder if I could have this kind of constraint on commodity in to a set of processes?

Thank you so much for your help,
Samaneh

[AKanudia]

UC_COMCON and UC_COMPRD lead to terse and robust specification, when you want to use the *entire* consumption/production of commodities in your constraint. Gasoline and ethanol in your case will likely go to processes outside your constraint.

Here is one way to formulate this constraint:

1. Row#1: CSET_CN=<ethanol>; PSET_CO=<car travel demand>; Attribute=UC_FLO; <Year>=1 - years can be col headers.
2. Row#2: CSET_CN=<gasoline>; PSET_CO=<car travel demand>; Attribute=UC_FLO; <Year>= MINUS<the min ratio of ethanol to gasoline - negative fractions> - years can be col headers.
3. Row#1: UC_RHSRT=0; LimType=LO
4. Row#1: Set an appropriate interpolation option for UC_RHSRT

[Samaneh]

Hi Dr. AKanudia ,

Thanks for your response. I have infeasible solution and I just want to make sure if I've got the formula right or not.

UC_N                  Pset_PN      Pset_CO      Cset_CN     Attribute   Year    LimType  UC_FLO  UC_RHSRTS
UC_ethtogsl         *GSL          TMD             Ethanol      UC_FLO     2010   LO           -1               1
                                               TMD             CONVGSL   UC_FLO     2010                   -0.1

Thanks,
Samaneh

[AKanudia]

PSET_PN should be empty and the UC_FLO in Row#1 should be 1. And my mistake... UC_RHSRT should be 0!

[Samaneh]

Thanks, it is working now
Samaneh