Inna Kim 3/5/2014

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I consider hydro power plant, which has different seasonal availability, since summer water stream differs from winter water stream. How can I account for it? Variables: capacity, availability and capacity credit can be described only for whole year.

Taylor Binnington 3/6/2014
 

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Hi Inna,

Hope it's alright if I answer this for you. Exogenous Capacity and Capacity Credit variables can not be supplied with seasonally-varying data: these variables are not intended to change depending on seasonal runoff.

However, you can add variations across each of your time slices, using the Maximum Availability variable. You can read about it here:

http://www.energycommunity.org/WebHelpPro/Transformation/Maxiumum_Capacity_Factor.htm

You can either supply seasonal availabilities using the TimeSliceValue() function:

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

or by creating a new Yearly Shape (using shape type = availability) to be assigned to your process's Maximum Availability.

Hope this helps,

Taylor

Inna Kim 3/7/2014
 

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Dear Taylor,
thank you for your fast responce, it helped a lot.
I have read again what is maximum availability is and got some questions.

1. According to definition, maximum availability is a "ratio of the maximum energy produced to what would have been produced if the process ran at full capacity for a given period". It looks like capacity factor. What is the difference between them if maximum availability is not the same as capacity factor?

2. At first I thought that maximum availability is "full capacity - technical limitaion" (for instance, different fuel, aging and etc), becuse form the discription of dispatching process on load curve "To properly represent the average technical availability of each plant (i.e., allowing for periods when plants are unavailable because of planned or unplanned outages), the maximum height of each strip is the available capacity for each group (i.e. the sum of Capacity x Maximum Availability) for all processes in the group." How do you account for technical limitations?

Let's assume we have power plant of 5 MW, which due to technical limitations can give only 4 MW (80%). Tis plant is run 5000 hours, what gives capacity factor as 57%.
If I set maximum availability as 80%, then it will give me mere energy than this plant can produce (from the definition), if I set it as 57%, then maximum power for dispatching will be taken as 5*57%=2.85 MW, however we have it as 4MW. Could you please help me with that ans explain what value corresponds to maximum availability?

Taylor Binnington 3/7/2014
 

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Hi Inna,

To answer you first question, there is no difference between Maximum Availability and what is usually referred to as a capacity factor.

Regarding technical limitations, the best way to reflect these is simply to reduce to exogenous capacity of the plant. If a 5 MW plant can only ever produce up to 4 MW as peak output, then effectively, it's only a 4 MW plant.

Good luck,

Taylor

Pinto Anugrah 3/20/2014
 

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Hi Inna,

Talking about seasonal availability in hydro power plant, I suggest you should try using WEAP (Water Evaluation and Planning) software. It is like LEAP's "sister", only WEAP used to modelling hydrological or water subject.

By using WEAP, you could do hydrological modelling on hydro power plant. Also you could consider the seasonal availability on the stream that you simulated. The result is the thing that Taylor mentioned as "Maximum Availability" in LEAP.

Please visit >> www.weap21.org
or download the tutorial for WEAP-LEAP integration >> http://www.energycommunity.org/documents/WEAP-LEAPTutorial.pdf

Hope this helps,
Good Luck.

Pinto

Vu Thi Hong Thuy 4/23/2014
 

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Hi Inna
Im using LEAP. i also want to modeling hydropower availability and Using WEAP is the best way to do that but i got the problem when i installed both that show in WEAP model "You can not link to LEAP, because it does not same installed in this computer". I use LEAP 2012.0056 and WEAP 3.43
Please give me some advise about that

Thanks
Thuy

Taylor Binnington 4/23/2014
 

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Hello Vu,

We're aware of this issue, and the WEAP developer is working to resolve the issue in the next version (if it hasn't already been resolve - please make sure you're using the most recent version of WEAP!).

If the problem persists, you can try following the instructions in this thread:

http://www.weap21.org/index.asp?action=9&read=2620&fID=30

Hope this help,

Taylor