SMA Sunny Island 5048 - Page 120

Sunny Boy SMA Technologie AG
Page 120 SI5048-11:EE4206 Technical Description
The points below have the following meanings:
•f
0
refers to the base frequency of the stand-alone grid
• Fac-delta– and Fac-delta+ refer to the maximum range in which the Sunny Boy is
active relative to f
0
• Fac-start delta refers to the frequency increase relative to f
0
, at which point the
power adjustment via frequency begins
• Fac-Limit delta refers to the frequency increase relative to f
0
, at which point the
power adjustment via frequency ends. The output of the Sunny Boy at this point is
0 W.
If the value is below the Fac-delta– limit or exceeds the Fac-delta+ limits, the Sunny Boys
disconnect from the grid.
When FSPC is activated and the diesel generator in the stand-alone grid is operating,
the diesel generator determines the frequency, and the Sunny Boys react to certain
changes in the diesel generator frequency. The diesel generators generally operate at
50 Hz under load. For this reason, in most cases the Sunny Boys will deliver their entire
power to the stand-alone grid, even when the generator is running.
If the current battery voltage (V
Bat
) is greater than the nominal battery voltage
(V
Bat, nom
) and is also to be synchronized with an external source (generator), the
Sunny Island 5048 temporarily increases the frequency and disconnects the Sunny
Boys using the frequency shutdown method (overfrequency). Afterwards, it
synchronizes with the generator.
Limit
Pac (%)
Fac (Hz)
+1 +2 +3-1-2-3 f0
50
100
Fac-Start delta (1 Hz)
Fac-Limit delta (2 Hz)
+4
Fac-delta+ (4,5 Hz)
-4
Fac-delta- (4,5 Hz)