YUE LIU 6/3/2014

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Hi Taylor,

I would like to use the historical method to dispatch the amount of electricity entered into the "Historical Production" variable for a specific energy technology, let's say for year 2015 to 2050. Hence, I would input "2051" to the "first simulation year" variable for this technology.

My question is how should I calculate capacity of this technology as inputs for the "Exogenous Capacity" variable to match the "Historical Production"?

Can I just simply use the values of "Historical Production", energy technology's "Maximum Availability" and "Process Efficiency" to calculate the matched capacity or "the Planning Reserve Margin" should be also considered into calculation? If so, how?

Thank you very much!

Best,
Yue

Taylor Binnington 6/4/2014
 

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Hi Yue,

Actually, the First Simulation Year controls only when process dispatch begins obeying the 'Dispatch Rule' variable, rather than Historical Capacity - LEAP still retains the ability to build new endogenous capacity before the First Simulation Year.

The simplest solution would be to allow LEAP to build endogenous capacity, and it will automatically keep pace with the module's requirements (while taking availability and reserve margin into account).

http://www.energycommunity.org/WebHelpPro/Transformation/Endogenous_Capacity.htm
http://www.energycommunity.org/WebHelpPro/Transformation/Endogenous_Capacityu_Expansion_Calculations.htm

Best,

Taylor

YUE LIU 6/6/2014
 

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Hi Taylor,

Thanks for your nice reply!

I am still not very clear about this.

For example, my study time frame is 2012-2030. In base year 2012, the electricity produced by wind is about 1% (10 TWh). In this energy system simulation, I would like to project 20% (300TWh) of electricity generated from wind by 2020.

Based on the energy demand analysis, I would know the total amount of electricity output in 2020. I could calculate the amount of electricity produced by wind to reach this 20% share (eg. 300TWh).

For control this 20% output by wind, I will need to use Historical dispatch,that is I will set the First Simulation Year for wind as "2021", input the amount of electricity calculated for wind in "Historical Production" as Interp(2012, 10, 2020, 300). And from 2021 to 2030, I would like dispatch in order of running costs.

My understanding is that from 2012-2020,LEAP uses historical dispatch and runs the process up to the amount specified in the Historical Production tab for wind. However, the wind capacity for 2012-2020 should be determined by the user or actually it would be automatically calculated by LEAP through using Endogenous capacity?

Many thanks!

Cheers,
Yue

Taylor Binnington 6/9/2014
 

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Hi Yue,

Good question - I think now that my first answer was too simplistic.

LEAP builds Endogenous Capacity to ensure that the module requirements, plus reserve margin, are met in each year. But this does not mean that endogenous capacity of each individual process is added to meet that process' Historical Production. So in your situation, you will in fact need to manually ensure that there is sufficient capacity to meet your historical generation target. A transparent way to do this would be to write, into Exogenous Capacity,

Historical Production[MW-hr]/(8760 * Maximum Availability/100 * Process Efficiency/100)

This will ensure that there is exactly enough capacity, but no more. Alternatively, if you know the base year Exogenous Capacity and wish to simply allow it to grow with Historical Production, you could instead enter:

GrowthAs(Historical Production)

http://www.energycommunity.org/WebHelpPro/Expressions/GrowthAs.htm

Either method should work, or you are free to develop you own expression that accomplishes the same thing. Hope this helps!

Taylor