Page 74
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSI 9000 15U/24U Series
3.10.15
Extended PV table function according to EN 50530
3.10.15.1 Introduction
This extended PV table function according to standard EN 50530 is used to simulate solar panels in order to test
and rate solar inverters. It’s available since firmware versions KE 2.19 and HMI 2.11 and offers manual configuration
and control, as well as remote control. It’s also based on the XY generator, same as the simple PV table function
from
, but enables more specific tests and evaluations due to adjustable parameters. Which parameters
are available is explained below. The impact of the parameters on the PV curve and the simulation is described in
the standard paper of EN 50530, which user can refer to in case more detailed description is required. This section
only deals about configuration and control of the PV simulation.
3.10.15.2
Differences to the basic PV function
The extended PV function has five additional or different characteristics compared to the simple PV function:
•
The simulation distinguishes between a single test run and an automatic test run, called day trend, which is based
upon a user-defined curve built from up to 100,000 points
•
There are two invariable and one variable panel technology available to choose from
•
There are more parameters available to adjust during runtime
•
It allows for data recording during runtime and to save the data either to USB stick or read via digital interface
•
It allows to select between two different parameter sets to adjust during runtime
3.10.15.3 Technologies and technology parameters
When configuring the PV simulation it’s required to select the solar panel technology to simulate. The technologies
cSI
and
Thin film
are invariable in their parameters, while technology
Manual
is variable in all parameters, but
within specific limits. This allows for the variation of the simulation and when copying the fixed parameter values
from
cSi
or
Thin film
to
Manual
, it even enables their variation as well.
One advantage of the invariable technologies is that their technology parameters are automatically set to their
defined defaults in the configuration procedure.
Overview of the technology parameters used in the PV curve calculation and their defaults:
Abbr.
Name
Manual
cSI
Thin film
Unit
FFu
Fill factor for voltage
>0...1 (0.8)
0.8
0.72
-
FFi
Fill factor for current
>0...1 (0.9)
0.9
0.8
-
Cu
Scaling factor for U
OC
(1
>0...1 (0.08593)
0.08593
0.08419
-
Cr
Scaling factor for U
OC
(1
>0...1 (0.000109)
0.000109
0.0001476
m²/W
Cg
Scaling factor for U
OC
(1
>0...1 (0.002514)
0.002514
0.001252
W/m²
alpha
Temperature coefficient for I
SC
(2
>0...1 (0.0004)
0.0004
0.0002
1/°C
beta
Temperature coefficient for U
OC
(1
-1...<0 (-0.004)
-0.004
-0.002
1/°C
(1 Uoc = Open circuit voltage of a solar panel
(2 Isc = Short-circuit current (=max. current) of a solar panel
3.10.15.4 Simulation mode
Apart from the panel technology there is also a simulation mode to select. Four options:
Mode
U/I
Controllable simulation. Voltage (U
MPP
, in V) and current (I
MPP
, in A) in the maximum power point
(MPP) are variable during runtime. The purpose of this mode is to directly shift the MPP into
various directions.
Mode
E/T
Controllable simulation. During runtime, the irradiation (E from german “Einstrahlung”, in W/
m²) and surface temperature (T, in °C) of the simulated solar panel are adjustable. This also
impacts the curve and the resulting MPP. The purpose of this mode is to analyse the impact of
temperature and/or irradiation on the performance of a solar panel.
Mode
DAY U/I
Automatic simulation run, processing a day trend curve consisting of up to 100,000 points defined
by values for U
MPP
, I
MPP
and time.
Mode
DAY E/T
Automatic simulation run, processing a day trend curve consisting of up to 100,000 points defined
by values for irradiation, temperature and time.
