Assessing diesel imports due to sulfur standard emission factor

[anadeveza]

Hello,

I would like to assess diesel imports variations due to the implementation of a sulfur standard emission factor.

In this case, the imports of diesel with low sulfur content are used to mix with local hight sulfur disel.

I plan to use a UC like this:

(q*s1+q2*s2)<=S*(q1+q2)
q1 amount of diesel produced by local refinery
q2 amount of imported diesel 
s1 sulfur emission factor of local diesel 
s2 sulfur emission factor of imported diesel 
S desired sulfur factor

Thus, q1 and q2, which are decision variables, should be included in my UC.

In manual IV, section 3.12.3.5, this modeling seems not to be possible. So, I would have to run the model first time, get the values, apply my desired emission factor to get to a constant value and then, apply this constant as UC.

However, in manual II, chapter 5.20, Case 2 seems to be what I am looking for.

Could you confirm if it is possible to perform what I wish? And could you give me an example on VEDA FE?

Thanks,
Ana

[Antti-L]

Practically any linear equations can be formulated with the TIMES UC constraints, at least between the standard variables (VAR_ACT, VAR_FLO, VAR_IRE, VAR_CAP, VAR_NCAP, VAR_COMPRD, VAR_COMNET).

Is this what you meant: (q1*s1+q2*s2) ≤ S*(q1+q2) ?
If so, it can be rearranged: q1*(s1-S)+q2*(s2-S) ≤ 0

Assuming that s1, s2 and S are parameters, and q1 and q2 are variables (or sums of variables), there is no problem in defining the constraint: it is linear in the variables. Just define UC_FLO for the diesel output flow q1 with the value (s1-S) and define UC_IRE for the diesel import flow q2 with the value (s2-S), and define UC_RHSRT to be zero, with LimType UP. But perhaps I am missing something?