User's Manual

SINVERT PVS in power plants12
SINVERT PVS in power plants
Link between solar power and public AC grid
How solar power is fed into the AC grid
Sunlight is transformed into solar energy in the photovoltaic
modules. The direct current obtained is bundled in the field
with the aid of SINVERT PVS CombinerBoxes and then fed into
a SINVERT PVS inverter (see diagrams on this page).
The alternating current supplied by the inverters is transformed
by medium-voltage transformers into the higher voltages of
20 kV, for example, that are needed for feed-in to the grid.
The inverters and the transformers are in a protected location in
inverter stations, as is the optional medium-voltage switchgear,
which allows energy to be distributed and fed into the
medium-voltage grid (see diagram on page 14).
SINVERT PVS CombinerBoxes for bundling partial currents
With the SINVERT PVS CombinerBox, the individual strings of
the photovoltaic generator are collected in the field, connected
in parallel and the energy conveyed via large cross-section
cables to the SINVERT PVS inverter or the inverter station.
Module strings can be "collected" and their energy transported
to the SINVERT PVS inverter or inverter station using a single-
stage or two-stage connection concept:
With the single-stage concept, the energy supplied by the
module strings to the inputs of the SINVERT PVS Combiner-
Boxes is transported directly to the SINVERT PVS inverter or the
inverter station via one output in each case.
Bundling of the solar direct current using SINVERT PVS CombinerBoxes
(single-stage concept)
With the two-stage concept, the module strings are initially
brought together in the SINVERT PVS CombinerBoxes (first
stage). The outputs of these SINVERT PVS CombinerBoxes
are then connected to other SINVERT PVS CombinerBoxes
(second stage). The outputs of the SINVERT PVS CombinerBoxes
of the second stage are then connected to the inputs of the
SINVERT PVS inverters or inverter stations. The advantage of
this two-stage concept is that power losses are reduced thanks
to the increased cable cross-sections.
Bundling of the solar direct current using SINVERT PVS CombinerBoxes
(two-stage concept)
The SINVERT PVS CombinerBoxes 108, 120, 124 with eight,
twenty, and twenty-four inputs are used in the first stage. The
CombinerBox 204 with four inputs is used in the second stage.
SINVERT PVS CombinerBoxes 124, 204, 120, 108 (from left to right)
Photovoltaic array
Service room
Photovoltaic modules
SINVERT PVS
CombinerBoxes 120
SINVERT PVS inverters
RE10_00027a
RE10_00026b
Photovoltaic array
Service room
Photovoltaic modules
SINVERT PVS
CombinerBoxes 108
SINVERT PVS
CombinerBoxes 204
SINVERT PVS inverters
SINVERT_PVS.book Seite 12 Donnerstag, 24. Mai 2012 3:01 15
© Siemens AG 2012