23
6. Operating behavior
EN
6.
Operating behavior
6.1
General principle of operation
The solar power inverter converts the DC electricity from the
PV modules into AC electricity. The AC electricity is then fed
into the public mains grid.
MPP tracker
The solar power inverter has an MPP tracker (MPP = Maxi-
mum Power Point).
The MPP tracker regularly scans a DC voltage range in the
vicinity of the actual working point in order to find a point
offering higher power. If a point offering higher power is
found then the solar power inverter sets this as the new
actual working point.
Anti-islanding
The integrated anti-islanding device switches off the solar
power inverter when the grid fails.
Temperature control
The convection cooling system provides optimum heat dis-
sipation.
An internal temperature controller limits the output power
under ambient temperatures in the upper operating range.
The solar power inverter is switched off when the ambient
temperature exceeds the operating temperature range.
DC voltages
The DC input voltages mentioned in this section are pro-
vided in Chapter
13 - Technical Data.
The
maximum input
voltage
must never be exceed. Measure the input volt-
age and use an overvoltage protection device on the DC
side to prevent higher voltages from reaching the inverter.
The maximum open-circuit voltage occurs at the lowest
assumed temperature. More exact information on tempera-
ture dependency is provided in the PV module data sheet.
The
feed-in voltage range
of the solar power inverter
defines the range of input voltages over which the solar
power inverter will feed electricity into the grid.
The
MPP input voltage range at full power
of the solar
power inverter defines the range of input voltages over
which the MPP tracker is activated.
The own power consumption of the solar power inverter is
negligible.
6.2
Efficiency
0.97
0.95
0.93
0.91
0.89
0.87
0
1000
2000
5000
3000
4000
305 V
540 V
700 V
Efficiency
Power [W]
Fig. 6.1.:
Efficiency as a function of power 5.0 TL
6.3
Functions for influencing the operating
behavior
A detailed description of the functions is provided in Chapter
10 - Settings.
● Fixed Power Limitation
● Effective power control
ETHERNET
● Reactive power control
ETHERNET
● Feeding of reactive power when the grid voltage fails
(Fault Ride Through)
● Isolation and grounding monitoring
● Remote stopping of grid feed
6.4
Fixed settings for reduction of effective
power and reactive power
ETHERNET
The settings for reduction of effective power and/or reactive
power can be configured during initial commissioning via
the Web Interface.
NOTE
► If the settings for reduction of effec-
tive power or reactive power must
be adjusted after commissioning,
these settings can only be adjusted
with a PIN process. Please see
Chapter 10 Settings -
Grid Change
for details on how to work with
Delta Support Team to accomplish
changes to grid settings via the PIN
process.
