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Sunny Island
12.2 Grid-Tied Operation (RUN_I)
In grid tied operation the Sunny Island follows the voltage and frequency defined by
an external power source. This can be an independent synchronous generator or the
public utility. In this case the Sunny Island does not control the grid voltage and grid
frequency, it controls the current it feeds to the grid. The battery is charged or the
grid is supported by discharging the batteries depending on the consumer/generator
situation within the grid. Defined and optimal charging of the battery at any time de-
sired is only possible in this mode.
PV Modules
Sunny Boy
Sunny Island
Fig. 12.2: Sunny Island with external grid-former
BWRI33-12:EE
Installation & Operating Instructions
Generator as
grid forming element
SG
230 V 50 Hz/60 Hz
Control of battery
current and
battery voltage
- 118 -
Control of
frequency
and voltage
Consumers
SMA Regelsysteme GmbH
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