Reference irradiance for HCPV model

3 posts / 0 new
Last post
Paul Gilman
Reference irradiance for HCPV model

I have a question regarding the reference selection for the cell efficiency table in the module model. I understand how the reference selection defines the Pmp Wdc, but I don’t understand how that seems to affect the total annual yield when I run the simulation. Can you explain how this happens since I would think the Pmp would be independent of yield once the cell efficiency profile is defined.

For SAM's concentrating PV model, you provide a set of cell efficiency values for a range of incident beam irradiance values, and you define one of the irradiance/effiicency pairs as the reference value. SAM uses the reference value to determine the module's rated maximum power.

The rated maximum power is also the array's nameplate capacity, and has two effects on the system when you run the model without a financial model: It determines the number of inverters in the system, and it determines the power required by tracking hardware. When you change the reference irradiance, SAM recalculates the number of inverters in the system for the new nameplate capacity. The difference in annual yield that you see is probably caused by the different number of inverters.

If you include a financial model in your analysis, the maximum power also determines the value of any $/W costs that you specify on the System Costs page, and any $/W incentives on the Incetives page.

Best regards,
Paul.

 

nkabouche
nkabouche's picture

But, how can we get this table (Irradiance, Concentration and cell efficiency)
Is it necessary to get all these values or we can use just one

Regards

Paul Gilman

SAM requires a table of values. If you only have a single reference value, you could estimate efficiency values at other radiation levels for a rough approximation of the HCPV module's performance.

Best regards,
Paul.

Theme by Danetsoft and Danang Probo Sayekti inspired by Maksimer