O&M Cost Model Used in Wisdem

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Anton.Andriyanov
Posts: 10
Joined: Fri Mar 24, 2017 3:14 pm
Organization: AWS Truepower
Location: New York

O&M Cost Model Used in Wisdem

Postby Anton.Andriyanov » Tue Mar 31, 2020 1:15 pm

Hello,

Before downloading Python and installing WISDEM, I tried to understand the O&M cost model used in WISDEM, but I can't find a manual or theory behind it on the web. From the presentations, I see that some of the inputs are layout Design and component mass, material properties, and dimensions. While I can guess how this information can affect the initial cost of the project, it is not clear the effect on operating costs, specifically:
1) How is the component reliability is modeled/estimated?
2) Is the O&M cost model based on discrete events? Is it replicating the 2008 era Spreadsheet Cost Spreadsheet? (Unless there is a more recent one)
3) Is there any Optimization happening?
4) Does WISDEM come up with O&M cost as a bulk for project life or it has a year by year breakdown?

Is there any literature that you can point me to where I can find answers to this.
Thank you very much,

Best regards,

Anton

Garrett.Barter
Posts: 1
Joined: Wed Apr 03, 2019 3:00 pm
Organization: NREL
Location: Colorado

Re: O&M Cost Model Used in Wisdem

Postby Garrett.Barter » Wed Apr 01, 2020 4:56 am

Hello Anton,

Thank you for your question. You are correct that there is not a lot of documentation online, we will hopefully be addressing that in the future, but it is a slow process. To answer your questions:

WISDEM is a steady-state analysis tool, so no fatigue loads are calculated and therefore component reliability is not a current output. We have some ideas about implementing surrogate fatigue models based on steady flow inputs, but no current funding to support that activity.

O&M costs can be estimated using an old regression curve (that is likely outdated for current turbine sizes) in the stand-alone NREL Cost and Scaling Model (CSM):
See line 1522 of https://github.com/WISDEM/WISDEM/blob/master/wisdem/nrelcsm/nrel_csm.py

If not using the CSM, O&M costs can be set as a static user input in the Plant_FinanceSE module:
See "opex_per_kW" input in https://github.com/WISDEM/WISDEM/blob/master/wisdem/plant_financese/plant_finance.py
To answer your question on the units, this is taken as an average annual cost over the project lifetime.

O&M cost modeling has long been a gap in the WISDEM toolset. We have either relied on outdated regressions, user-input values, or 3rd party tools. Fortunately, we are just beginning an O&M model development process that will leverage the discrete event simulation infrastructure in the offshore balance-of-plant cost model, ORBIT (repo: https://github.com/WISDEM/ORBIT and WISDEM integration:https://github.com/WISDEM/WISDEM/tree/master/wisdem/orbit links). It will rely on user-input failure rates.

Cheers,
Garrett

Anton.Andriyanov
Posts: 10
Joined: Fri Mar 24, 2017 3:14 pm
Organization: AWS Truepower
Location: New York

Re: O&M Cost Model Used in Wisdem

Postby Anton.Andriyanov » Wed Apr 01, 2020 7:29 am

Garrett,

Thank you very much for such a thorough explanation. This was very helpful.
Best regards,

Anton


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