Topic: questions regarding results Subscribe | Previous | Next
Argiro Roinioti 5/20/2011
2331 Views Hello,
I have gathered a few questions to ask, I would really appreciate your feedback.
1. First of all, I would like to ask if LEAP can present accumulated results for each scenario, e.g. the total amount of emissions or costs for all the simulated years, for each scenario.
2. Another thing is that I have a problem with the results, I notice a very big difference in the emissions as well as the dispatched power, between my base year and the consequent first simulated year (in my example I have set 2008 as base year and 2009 as the first simulated year). Could you tell why that happens?
3. Also, I have chosen the load duration curve for the entire system, in order to describe the electric system load. As a result, LEAP computes the same load factor for all the simulated years, so the power dispatched is the same for all time slices. Is there a way to change that, maybe introduce a different load factor for the years to come?
Because if it very difficult to introduce end year load curve data (3rd method).
Thank you in advance.
Sincerely,
Argiro Roinioti
Tory Clark 5/23/2011
2322 Views Hi Argiro,
I apologize for the slow reply. Let me respond to each of your questions individually.
1. For both Global Warming Potential and Costs, you can choose to show cumulative results. To do this click on the "More" button on the Chart or Table tab of results. Then in the "Values" drop down menu, choose cumulative instead of absolute. This calculates the cumulative value of the referenced branch summed from the base year.
2. This can be an indicator of many things since 2009 is the year LEAP starts projecting data based on new equations instead of historical data. Good first things to check are that your historical generation data match your electricity demand and that your dispatch rules simulate how power was dispatched in historical data.
Remember that before the first simulation year LEAP dispatches electricity using the historical generation variable, regardless of how much electricity demand there is. Starting in the first simulation year, plants are dispatched based on various dispatch rules. This means that there can easily be a discrepancy in domestic generation, emissions and dispatch.
I find the Transformation: Module Balance a helpful place to start when investigating those kinds of discrepancies.
3. The power dispatched will not be the same for all time slices if you are using a system load curve. Note that we have changed the way that LEAP deals with loads in LEAP2011. Please read the following help files for more information.
Dispatching on a load curve: http://tinyurl.com/45k4r2e
Time Slices: http://tinyurl.com/3usj4yy
Yearly Shapes: http://tinyurl.com/3p5dl6d
Best,
Tory
Argiro Roinioti 5/23/2011
2320 Views Hello Tory,
Thank you answering all my questions. I opened my file with the new version. I opened the balance module as you suggested and there seems to be a problem, because the energy balance graph doesn't seem right.
https://rapidshare.com/files/2322622912/balance.png
https://rapidshare.com/files/3751163290/balance_-_table.png
My historical data is for year 2008. I have introduced a growth rate in the energy demand from year 2009 and my dispatch rule is by merit order. I have also allowed multiple iterations in the electricity production.
As far as the system load curve is concerned,I use the load duration curve and the amount of dispatched power is still the same for each time slice. Is there a way to change the future load factor? Because the only projections I have are for the future load factor.
Thank you in advance for your help, I really appreciate it.
Sincerely,
Argiro
Tory Clark 5/24/2011
2317 Views Hi Argiro,
It seems like there is an error in your demand branches, because the results show zero demand for all fuels, including electricity. I suggest you double check your demand branches to make sure that you get a non-zero value for your Activity Level * Final Energy Intensity.
And I think I am still not clear on your question about load duration curves. By definition, if you enter a load curve your dispatched power will vary by time slice. This can be seen in the Transformation: Power Dispatched result graph (the total curve should look like the one entered in the general: yearly shapes screen).
If you are looking at another graph with years as the x-axis it is possible for the annual power dispatch to be the same for all years, in the case that annual demand does not change over time. But this is different than looking at dispatched power by time slice.
Additionally, you can change the yearly shape over time, which may address your comment about future load factor. The YearlyShape function can take 3 parameters: yearly shapes for the base year, last historical year and end year.
To read more about how that works, please see the help file:
http://tinyurl.com/43gcnj9
Best,
Tory
Argiro Roinioti 5/25/2011
2315 Views Dear Tori,
I don't understand why the energy balance showes zero demand.It also showes zero supply from my main electricity production branch ( I also have a smaller one for the autonomous producers, which also showes zero supply), although my graphs of transformation output seem normal in the results.
My final energy intensity is not zero however.
https://rapidshare.com/files/2631617741/final_energy_demand.pptx
I have introduced a variable called total energy and the ratio "total energy/activity level" is not zero.
Can you think of a reason why that happens?
Argiro
Tory Clark 5/25/2011
2314 Views Can you send me your dataset to leap@sei-us.org using the Area: Email feature so that I can investigate further?
Argiro Roinioti 5/25/2011
Tory Clark 5/27/2011
2306 Views Hi Argiro,
It appears to be only an issue of scale. If you increase the number of decimal places in the energy balance you see that you do have demand for all fuels, it is just dwarfed by electricity demand for Lignite mining. You should check the scale of your lignite transformation inputs and that should fix the problem.
Best,
Tory
Argiro Roinioti 5/30/2011
2289 Views Tori,
Thank you very much, this scale problem was also the reason for the difference between the historical year and the first simulated years.
Thank you so much for pointing out to me.
Sincerely,
Argiro