Seting the height that the wind speed is calulated at

[mmoulton1]

Hi,
When I run my simulation and set the hub height to 100m, I get a message that says the hub height has been reset to 80m. Is there a way to get around this. This is my input file.

SiteInfo
site:
data:
lat: 37.87
lon: -122.26
elev: 0
year: 2012
tz: -6
site_boundaries:
verts:
- [3.06, 288.87]
- [0.0, 1084.03]
- [1784.05, 1084.24]
- [1794.09, 999.64]
- [1494.34, 950.97]
- [712.64, 262.8]
- [1216.98, 272.36]
- [1217.76, 151.62]
- [708.14, 0.0]
urdb_label: "5ca4d1175457a39b23b3d45e"
hub_height: 105.0
solar: true
wind: true
wave: false

Technologies

technologies:
pv:
panel_system_design: !include "residential_pv.yaml"
system_capacity_kw: 100000
dc_degradation: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
wind:
num_turbines: 20
turbine_rating_kw: 5000
rotor_diameter: 100
layout_mode: "basicgrid"
layout_params:

row_D_spacing: 5.0

turbine_D_spacing: 5.0

site_boundary_constrained: False

grid:
interconnect_kw: 500000000
ppa_price: 0.01

updating wind resource hub-height to 80.0m and redownloading wind resource data. This is the message I get.
Also where can I find the formulas used in the solar panel model and the wind turbine model?

[elenya-grant]

Hi @mmoulton1!

Wind Turbine Hub-Height

This message pops up when the wind turbine hub-height doesn't match the hub-height input into SiteInfo. The 80m is associated with the default PySAM wind model used in HOPP. To update the wind turbine hub-height, specify hub_height under the wind technologies section of the input file.

site:
  ...
  hub_height: 100 # make sure this matches the hub_height under 'wind'
technologies:
  wind:
    hub_height: 100 # make sure this matches the hub_height under 'site'
    ...

If you specify the hub_height for the wind technology, this should resolve the problem (let us know if it does!).

Formulas

What formulas are you referring to when you say "where can I find the formulas used in the solar panel model and the wind turbine model"? A good starting place would be to look:

• wind_plant.py: WindConfig organizes the input parameters, these input parameters are passed to WindPlant
• pv_plant.py: PVConfig organizes the input parameters, these input parameters are passed to PVPlant.

More detailed formulations are going to be found in any tools or packaged called within the WindPlant and PVPlant functions. For example, the system model of PVPlant usually uses the PvWattsv8 module available in PySAM.

Happy to provide more information if there's specific formulas you're interested in!

[mmoulton1]

Hi @elenya-grant,
When I changed the hub height under technologies. I got this message.

ValueError: Input hub-height (100) does not match hub-height for turbine (80.0). Please correct the value for hub_height in the hopp config input to 80.0.

Is it possible that at the location I chose there is not wind resource data above 80m and if I pick a different location there are wind speeds above 80m?

[mmoulton1]

Hi @elenya-grant ,
I answered my own question. I changed the coordinates of the site and I was able to increase the hub height to 100 without the program changing the hub height. Thanks.