Sub Hourly Clipping linearization study

[Sergio Táboas]

Hello,

I have some doubts on the GHI linearization method for the correction of sub-hourly clipping losses, used in the study:

 "A model correcting the effect of sub-hourly irradiance fluctuations on overload clipping losses in hourly simulations", 2022, André Mermoud, Bruno Wittmer, Michele Oliosi, Agnès Bridel, Adrien Villoz, that was presented at the WCPEC8 conference of 2022 in Milan, Italy.

https://www.pvsyst.com/wp-content/uploads/2023/01/PVsyst_SubHourlyClipping_WCPEC8_2022.pdf

 

Specifically, about the section 2 APPROACH FOR THE SUB-HOURLY CLIPPING CORRECTION:

1) In the study, it mentions three parameters that are saved with each hour data, obtained from the minute-level data. Are these parameters just the minimum, maximum and mean GHI values in each hour? It's not clearly stated in the study, just to confirm.

2) How did you calculate the clipping threshold in GHI (W/m2)?

3) How do you apply the correction on the inverter model in PVsyst? It's not explained in the study. The example used in 2.3 doesn't show any clipping correction.

 

Apart from these doubts, do you plan to integrate in PVsyst any method for sub-hourly corrections?

 

Thanks in advance.