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Radiation gain on tracker plane - Actual vs PVsyst estimation
https://forum.pvsyst.com/viewtopic.php?f=24&t=4549
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Author:  Janani [ Sat Sep 07, 2019 6:28 am ]
Post subject:  Radiation gain on tracker plane - Actual vs PVsyst estimation

Hi,
We have actual measured GHI data from site and actual tracker gain obtained from it.
When the same GHI data was imported in PVsyst, it showed a higher tracker gain than the measured. We understand that one reason is the diffused content variation between actual & estimated which affects tracker gain. The differences are tabulated below.
Actual at site Pvsyst Prediction for the same GHI
Month GHI (kWh/m2/d) Tilt radiation (kWh/m2/d) Radiation gain on tracker plane (%) Tilt radiation (kWh/m2/d) Radiation gain on tracker plane (%)
Jan 5.23 6.15 17.59% 6.55 25.15%
Feb 5.49 6.46 17.67% 6.79 23.60%
Mar 6.31 7.27 15.21% 7.88 24.84%
Apr 6.19 7.03 13.57% 7.60 22.78%
May 5.97 6.84 14.57% 7.23 21.04%
Jun 5.35 6.05 13.08% 6.36 18.94%
Jul 4.7 5.19 10.43% 5.55 17.98%
Aug 4.27 4.65 8.90% 5.04 18.08%

Pl clarify whether PVsyst team has done any comparison of actual gain vs PVsyst estimation for trackers and has done any validation of the inbuilt tracking algorithm .

Pl note, the parameters such as tracking angle, pitch and orientation were maintained same as per site condition


Thank You

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