LEAP

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Topic: Endogenous Capacity Expansion problem,Subscribe | Previous | Next

Tae Hyun Yoo 9/7/2016

Dear Mr/Ms.

We are trying to make generation expansion planning with LEAP.

But, there are several problems occurred and we have some questions about endogenous capacity Expansion problem.

The page " endogenous capacity expansioin" helps us to understand the basic scheme of the LEAP, but we need much detail questions.

The questions are summarized in attached PDF.

Could you answer me about questions? :)

Attachments:

Endogenous capacity.pdf [25]

Taylor Binnington 9/19/2016

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Hi Tae Hyun,

Sorry for the late reply - and thank you for your careful description. Just to be clear, are you using the latest version of LEAP?

I have two comments about your approach:

1) The reserve margin is (capacity credit * capacity - peak power requirements) / peak power requirements. Since your Capacity Credit variables are set to 100%, then your calculation of actual reserve in 2028 yields the correct number, but I wanted to make sure that you were aware that if capacity credit was < 100%, you would need to account for the variable in your calculation.

2) Endogenous capacity additions obey the "Addition Order" *across years*. This means that in 2029, you will see 1000 MW coal, then 900 MW gas, which is (barely) insufficient to meet reserve. LEAP then returns to the plant with Addition Order = 1 and builds it, even if that means the reserve margin is over-satisfied. It does not start by building the nuclear plant in 2029.

Other that these two points, your understanding of endogenous capacity additions is correct.

Hope this helps,

Taylor

Tae Hyun Yoo 9/22/2016

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Hi Taylor

Thank you for kind explanation of the endogenous addition method. I have one more question about capacity expansion with optimization method(especially MILP). First, I try to test the optimization in LEAP with simple exercsie.

My purpose is to add addition size(100MW) constraint to optmization exercise in LEAP.

Based on "complete optimization exercise" version(The file that was uploaded in previous LEAP website), I modify two things below.

1. Basic parameter-> optimization-> check "enable addition size for MILP".

2. Transformation->electricity generation->processes->minimum addition size ->setting all resources to 100MW.

From the result, reserve margin is about 261% in 2014 and I think it is abnormal condition. Without above two things, I do not adjust other things.

Could you help me to solve the abnormal condition?

*If you need LEAP file, I will send you e-mail.

Taylor Binnington 9/23/2016

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Hi Tae Hyun,

From your post, I can't be sure if the reserve margin is high because of the exogenous capacity you've included in your model, or because the optimization routine is building too much (endogenous) capacity. Determine what you would expect the reserve margin to be based only on exogenous capacity: even if you have accurately reflected historical installed capacity, if you historical electricity requirements are underestimated then you would see a large reserve margin.

If this doesn't help clarify things, I'll need to have a look at your specific model.

Taylor