julmou Posted May 12, 2022 Share Posted May 12, 2022 A thought occurred to me as I was reading this part of the documentation: Project Design > Shadings > Backtracking Strategy > Backtracking Parameter Management. See screenshot below. Quote During the simulation, the backtracking angle calculation will be the same for all trackers, based on this reference. So basically, on the typical 50, or 100 or 200 MW solar plants here in Australia, there are thousands of trackers. And the way it's simulated, is that ALL trackers move exactly at the same time and do the same exact movement with the same angle. And I assume that the simulation is making it so that it is back-tracking only as much as it needs to, based on the sun's position and the incidence angle, so this is assuming that every single tracker on the field also has the utmost precision estimating or measuring the sun's position and deducing the right angle to adopt. My point is, I think the way it's simulated is too perfect, and I doubt that: all trackers move exactly at the same time, hence there is some kind of mismatch loss, due to the trackers being slightly not all in phase with each other (in practice, they are indeed independent, and wouldn't all move exactly the same way like in the simulation), and I also doubt that they all have the correct perfect angle, there's maybe some margin to make absolutely sure that there isn't any mutual shading, and I also believe that whatever the way they estimate the proper angle to have at any time, there is some uncertainty in the process For these two reasons, I was thinking that it would probably be adequate to incorporate in PVsyst a type of "tracking losses" section, with for instance, a mismatch loss, and an "imprecision" or "inaccuracy" or "miscalculation" loss. What do you think? Besides, maybe it's unrelated, but all tracking solar farms I have re-created so far in PVsyst (with backtracking) perform much less in reality that in the simulation, with the difference being quite notably bigger than what I get with sheds solar farms. Link to comment Share on other sites More sharing options...
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