How to see Wind and PV curtailment/interconnection losses in a Hybrid model

Hi

I am working on a PV + Wind + BESS hybrid BTM model. This is for a town to procure self-generation solar and wind to reduce their reliance on the national grid. In the model I have set the grid interconnection limit to 0kWac as we are not allowed to export any excess solar and wind electricity. Thus, this excess production gets curtailed. In the PV-Battery model it is easy to see when the solar energy is curtailed and to quantify it. However, the PV-Wind-Battery shows the overall curtailment. 

Does SAM differentiate between PV and Wind being curtailed? These values will be used in our financial model for deemed energy charges.
During the evening, it's easy to work out that the wind is the one being curtailed, but during the day which production is SAM curtailing?

I can provide the SAM model if you want.

Regards
Michael

Hi Michael,

For SAM's hybrid configurations, the model adds up generation from the PV, wind (and custom generation profile) models. Battery dispatch, curtailment, and grid limits respond to that combined generation profile. SAM does not have information about which part of the system was curtailed.

SAM does report a "system output generated" time series output for each performance model, so you should be able to work out which part of the system is generating power during curtailment periods.

Best regards,
Paul.

Hi Paul

Thanks for the response.

Most of the curtailment occurs when wind and solar generation exceeds the BESS charging and load use. At this time the grid to load/BESS is 0 kW and some renewable generation is curtailed. Would it then be fair to assume that wind and solar share the curtailment 50/50% or can I assume that in real life we would curtail one or the other?

Hi Michael,

For hybrid configurations, SAM does not keep track of how much power comes from each power source.

In a real system, a controller would determine how power from the different sources is distributed. Depending on how the system is designed, excess power may be sent to a dump load, wind turbine blades might be feathered, or power electronics might set the array voltage, or some other method employed to reduce or absorb power.

SAM assumes that a control system in installed and working properly, but it doesn't explicitly model the mechanism for controlling how power is distributed or controlled.

Best regards,
Paul.