Prescribing Ramp up and Ramp down rates for thermal power generation capacities
#5
Yes, ACT_UPS(r,y,p,s,bd) is defined as "Ramping limit for the load level of process p, vintage y in region r and timeslice s; Unit: fraction of nominal on-line capacity per hour".

The AnswerTIMES description, “max change in load level in proportion to the capacity, per hour” is thus also correct, with the refinement that the "capacity" refers to the on-line capacity.

From this definition, it should obvious that if there is a plant with ramp-up and ramp-down rate defined as 10%, and has 100 MW of capacity on-line but operating only at a 60 MW load level in hour 01, the maximum ramp-up and ramp-down rates are 10 MW per hour in both directions (0.1 × 100 = 10).

It should be equally obvious that if the on-line capacity of this plant is only 60 MW and it is also operating at full load (60 MW) in hour 01, the maximum ramp-rate would be zero in the upward direction and 6 MW per hour in the downward direction (0.1 × 60 = 6).

By default, the on-line capacity of a process is its full capacity, but if you enable start-ups/shut-downs, it will be endogenous.

See the attachment for some more information.


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.pdf   TIMES-Dispatching-Formulations-V7.pdf (Size: 132.95 KB / Downloads: 25)
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RE: Prescribing Ramp up and Ramp down rates for thermal power generation capacities - by Antti-L - 04-08-2016, 11:18 PM

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