Operating Behavior; General Principle Of Operation; Functions For Influencing The Operating Behavior; Fixed Settings For Reduction Of Effective Power And Reactive Power - Delta SOLIVIA 11 EU G4 TR Betriebsanleitung

6. Operating behavior

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.
The "Shadowing " function can be used to set the MPP
tracker to scan over a wider DC voltage range. This function
is especially useful when small shadows regularly pass over
the PV modules, e.g. from chimneys or trees.
High frequency transformer
The AC and DC sides of the solar power inverter are gal-
vanically isolated via a high frequency transformer. This
makes it impossible for DC electricity to reach the AC side
of the inverter.
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 "15. Technical data", p. 57.
The maximum input voltage must never be exceed.
Measure the input voltage and use an overvoltage protec-
tion 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 temperature 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.
16
Efficiency
0.97
0.95
0.91
0.89
0.87
0.85
0 2000 4000
425 V
Fig. 6.1.: Efficiency as a function of power
6.2 Functions for influencing the operating
behavior
A detailed description of the functions is provided in chapter
"10. Settings", p. 37.
● Effective power control
● Reactive power control
● Feeding of reactive power when the grid voltage fails
(Fault Ride Through)
● Isolation and grounding monitoring
● Extended MPP tracking in the case of partial shadowing
of the PV modules
● Remote stopping of grid feed
● Actuation of external signaling systems via relays
6.3 Fixed settings for reduction of effective
power and reactive power
The settings for reduction of effective power and/or reactive
power can be configured during initial commissioning. After
completion of initial commissioning the values can only be
changed using a PIN.
6.4

Data analysis and communication

The solar power inverter is controlled by microcontrollers
that also implement the interface communication, the moni-
toring of the values and the display messages.
The solar power inverter acquires and saves various data
values that can be directly shown on the display or sent to a
PC and displayed there.
Production information
Production information is available for the actual day, week,
month etc. The production information is saved each month.
Saving the configuration settings
The configuration settings of the solar power inverter can be
exchanged between solar power inverters of the same type
by using a USB stick.
Operation and installation manual for SOLIVIA 11 EU G4 TR
6000 8000 10000
Power [W]
600 V 800 V