HT PVCHECK - Temperature Effects Compensation

PVCHECK
14
5.2.3. Selection of the compensation relationship of temperature effects
This option allows selecting the relationship to be used to correct the measurements
performed according to the modules’ temperature as regards the calculation of nDC
efficiency. The following modes are available:
– T.Mod.: Correction factor Rfv2 related to PV module Temp. (Italian guideline CEI-82-25)
– T.Env: Correction factor Rfv2 related to environmental Temp. (Italian guideline CEI-82-25)
– -nDC: nDC correction according to module temperature
CAUTION
If it’s performed a test according to Italian guideline it is recommended to select “T.Env.”
correction
Corr.
Type
Temperature used (Tcel)
Calculation of nDC
Ref.
where :
Symbol
Description
Measuring
unit
Gp
Irradiance measured on PV module surface
[W/m
2
]
G
STC
Standard Irradiance = 1000
[W/m
2
]
Pn
Rated Power = sum of all Pmax values of the section of the PV plant
being measured
[kW]
P
dc
DC power measured at the PV generator’s output
[kW]
Rfv2
Correction factor depending on the Temperature of PV Cells (Tcel)
measured or calculated according to the type of selected correction
relationship
Absolute value of the thermal coefficient of Pmax of the PV modules
included in the plant section being measured.
[%/
0
C]
NOCT
(Normal Operating Cell Temperature) = Temperature the cells under
reference conditions are brought to (800W/m
2
, 20°C, AM=1.5, air speed
=1m/s).
[%/
0
C]
For further details see § 11.1