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Shift reference iteration for carbon price adjustment, and relax bounds on slope #2360

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Shift reference iteration for carbon price adjustment, and relax bounds on slope #2360

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8e4f55c
test comparison point shift
robertpietzcker Jun 3, 2026
1fd3948
increase delay to 8
robertpietzcker Jun 3, 2026
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6 changes: 4 additions & 2 deletions modules/47_regipol/regiCarbonPrice/postsolve.gms
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Original file line number Diff line number Diff line change
Expand Up @@ -251,6 +251,8 @@ loop((ext_regi,ttot)$regiANDperiodEmiMktTarget_47(ttot,ext_regi),
p47_slopeReferenceIteration_iter(iteration,ttot,ext_regi) = 1;
elseif(NOT(p47_currentConvergence_iter(iteration,ttot,ext_regi) eq p47_currentConvergence_iter(iteration-1,ttot,ext_regi))), !! reset the iteration reference for slope calculation if the target that is being analyzed changes
p47_slopeReferenceIteration_iter(iteration,ttot,ext_regi) = ord(iteration);
elseif ( iteration.val - p47_slopeReferenceIteration_iter(iteration-1,ttot,ext_regi) > 8 ) !! make sure the reference point is updated regularly, so the comparison point is not stuck in some very different past.
p47_slopeReferenceIteration_iter(iteration,ttot,ext_regi) = iteration.val - 8 ;
else
p47_slopeReferenceIteration_iter(iteration,ttot,ext_regi) = p47_slopeReferenceIteration_iter(iteration-1,ttot,ext_regi);
);
Expand Down Expand Up @@ -329,10 +331,10 @@ loop(ext_regi$regiEmiMktTarget(ext_regi),
*** if we are still using the slope
if(NOT(regiEmiMktRescaleType(iteration,ttot,ttot2,ext_regi,emiMktExt,"squareDev_noNonPositiveSlope")),
*** clamp slopes values to avoid extreme changes (or no change) on a single iteration (avoid corner cases where other parts of the model changes causing undesirable fluctuations on the calculated slope)
if((p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) gt -0.3) OR (p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) lt -5),
if((p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) gt -0.05) OR (p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) lt -5),
p47_clampedRescaleSlope_iter(iteration,ttot,ttot2,ext_regi,emiMktExt) = p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt);
);
p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) = max(-5,min(-0.3, p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt)));
p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) = max(-5,min(-0.05, p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt)));
*** calculate the tax rescale factor using the above calculated slope
pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt) =
(
Expand Down
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