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Apparent & Reactibve power calculation in PVSyst
https://forum.pvsyst.com/viewtopic.php?f=25&t=4294
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Author:  Janani [ Wed Feb 13, 2019 1:04 pm ]
Post subject:  Apparent & Reactibve power calculation in PVSyst

Hi,
I am working on a project of 600MWp and currently performed a simulation in PVsyst v 6.78. this project required grid injection power to limited to xMW @0.928 leading pf.

Same has been incorporated in the available feature of PVsyst and a sample hourly data from .csv file for one day is provided below.

As Per Pvsyst .csv file
Timec E_Grid EApGrid EReGrid
W kVAh kVAh
07:00 22364995 24096 8968.4
08:00 2.19E+08 236112 87879
09:00 3.93E+08 423580 157653
10:00 3.76E+08 404983 150731
11:00 3.5E+08 377463 140488
12:00 3.35E+08 361452 134529
13:00 3.44E+08 370845 138025
14:00 3.57E+08 384763 143205
15:00 3.43E+08 369665 137586
16:00 1.34E+08 144761 53879

If I calculate the apparent power & reactive power manually, there is a mismatch between calculated value & PVsyst simulated value. Pl find below the calculated values of the same.

From Pvsyst Calculated value
Time E_Grid EApGrid EReGrid
W kVAh kVAh
07:00 22364995 24100.21 8965.278
08:00 219148490 236151.4 87848.32
09:00 393148430 423651.3 157598.3
10:00 375887535 405051.2 150679.1
11:00 350344222 377526.1 140439.7
12:00 335483790 361512.7 134482.7
13:00 344202008 370907.3 137977.5
14:00 357120146 384827.7 143155.9
15:00 343106886 369727.2 137538.5
16:00 134360623 144785.2 53860.08

Pl help in bridging this mismatch.

Thank You.

Author:  AndrĂ© Mermoud [ Fri Feb 15, 2019 11:04 pm ]
Post subject:  Re: Apparent & Reactibve power calculation in PVSyst

The errors are of the order of 0.016% of EApGrid. This is a rounding effect of course (pro^bably on your Cos(Phi) value).

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