Negative electric power

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Francisco
Topic Author
Junior Member

17 Apr 2021 21:46 #9472 by Francisco

Negative electric power was created by Francisco

Dear community,

I am simulating a CSP plant with central tower technology. When I get the results, there are certain hours that I have a negative generation. What would be the physical explanation for that? How is it possible to have a generation less than 0? I would really appreciate if you help me understand it. I am attaching an image to make it a little clearer.
Thank you very much in advance,
Francisco

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Paul Gilman
Platinum Member

19 Apr 2021 16:57 #9479 by Paul Gilman

Replied by Paul Gilman on topic Negative electric power

Hi Francisco,

Negative power indicates that the system is consuming more power than it generates. In the case of a CSP power tower system, SAM models parasitic loads for electric pumps and heaters that circulate and heat the HTF at night to prevent it from freezing.

Best regards,
Paul.

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Francisco
Topic Author
Junior Member

19 Apr 2021 20:08 #9480 by Francisco

Replied by Francisco on topic Negative electric power

Thank you very much for your kind reply Paul. One last question please. I think that in previous versions of SAM, for CSP technology it was possible to define the "Storage Distpach" (w / solar or w / o solar). Currently that is not possible anymore? Now I only have Turb. ouput fraction. Or maybe I'm looking wrong.
Thank you,
Francisco

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Paul Gilman
Platinum Member

19 Apr 2021 22:19 #9482 by Paul Gilman

Replied by Paul Gilman on topic Negative electric power

Hi Francisco,

As of SAM 2020.2.29, the Physical Trough model uses a new dispatch control algorithm in place of the old manually controlled method. See the Help topic for the System Control page for a description of the algorithm. It is also described in Wagner M (2018) "Optimized Dispatch in a First-principles Concentrating Solar Power Production Model" available under "Power Tower" on the CSP publications page: sam.nrel.gov/concentrating-solar-power/csp-publications.html .

If you have a reason to use a model with the old dispatch method, you can download SAM 2018.11.11.

Best regards,
Paul.

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Negative electric power

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