WindPower Losses Group

ijbd
Topic Author

20 Jan 2022 10:27 #10527 by ijbd

WindPower Losses Group was created by ijbd

Hello!

I'm currently using PySAM and wanted to clarify the documentation on the WindPower Losses class.

In the documentation , most losses are marked "If not provided, assumed to be 0."
However, for the following model...

Code:

﻿d = wp.default("WindPowerNone")
   ﻿d.Resource.wind_resource_model_choice = 0 # hourly
   ﻿d.Resource.wind_resource_filename = windSRW # srw filename
   ﻿d.Turbine.wind_turbine_powercurve_powerout = powerout # ndarray
   ﻿d.Turbine.wind_turbine_powercurve_windspeeds = speed # ndarray
   ﻿d.Turbine.wind_turbine_hub_ht = 100
   ﻿d.Farm.wind_farm_xCoordinates = [0]
   ﻿d.Farm.wind_farm_yCoordinates = [0]
   ﻿d.execute()

The losses are assigned as follows:

Code:

Balance-of-plant = 0.5
Grid availability = 1.5
Turbine availability = 3.58
Electrical efficiency = 1.91
Electrical parasitic = 0.1
Environmental degradation = 1.8
Environmental conditions = 0.4
Environmental exposure = 0.0
Environmental icing loss = 0.21
Environment curtailment = 1.0
Grid curtailment = 0.84
Load curtailment = 0.99
Operational strategy = 0.0
Turbine generic = 1.7
High wind hysteresis = 0.4
Sub-optimal performance = 1.1
Site-specific loss = 0.81
External wake loss = 1.1
Future wake loss = 0.0
Internal wake loss = 0.0

Just curious if this mismatch is intentional and/or if I missed an important dependency.

Thanks (:

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pgilman

20 Jan 2022 15:40 #10532 by pgilman

Replied by pgilman on topic WindPower Losses Group

Hi Isaac,

This is a situation where it's helpful to look at the SAM desktop application to see how the inputs are presented and documented.

The detailed loss inputs are part of the wind uncertainty model, which was not part of the original wind power model. They apply in addition to the "regular" model's losses, which may be calculated by the wake model or provided as input (see the Wind Farm page in SAM).

The uncertainty model is based on IEC 61400-15 and reports p75, p90, and p90 annual energy values based on the losses and distributions you provide. You can ignore the detailed losses unless you have a reason to use them, or are using the uncertainty model. When you enable the uncertainty model in SAM, it displays statistical results on the Uncertainties tab of the Results page. This feature is not available in PySAM.

Best regards,
Paul.

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