Description Of The Equipment; Operating Diagram - ABB UNO-2.0-TL-OUTD Product Manual

2 - Characteristics
D
escription of the equipment
This equipment is a string inverter which converts the direct current of a
photovoltaic generator into alternating current and feeds it into the public
distribution grid.
Photovoltaic panels convert solar radiation into "DC" electrical energy
(via a photovoltaic field, also called PV generator); in order to use it, it
is transformed into "AC" alternating current. This conversion, known as
inversion from DC to AC, is done in an efficient way by the ABB invert-
ers, without using any rotary elements, rather only via static electronic
systems.
In order to allow inverter operation in safe thermal and electrical condi-
tions, the unit automatically reduces the value of the power fed into the
grid under adverse environmental conditions or unsuitable input voltage
values.
When connected in parallel with the grid, the alternating current from the
inverter flows directly into the domestic or industrial distribution circuit,
which is in turn connected to the public distribution grid.
This way the solar energy system compensates for the energy drawn
from the utilities connected to the grid to which it is linked.
When the photovoltaic system is not generating sufficient energy, the
power required to ensure proper operation of connected loads is taken
from the public distribution grid. While if too much energy is produced, it
is directly fed to the grid, thus becoming available to other users.
According to national and local standards and regulations the produced
energy can be sold to the grid or credited to the user against future con-
sumption, thus granting a great saving of money.
O
perating diagram
AC safety devices
Inverter
PV
DC Disconnect
(Thermal-magnetic.
Grid Grid
Panels
switch/es
differential)
distributor
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