SMA America, LLC
17 PV Inverters
Technical description
SI4548_6048-US-TB_en-13
155
This function is shown in the following figure:
The different settings have the following meanings:
• f
0
refers to the base frequency of the micro grid created by the Sunny Island.
• f
AC
Delta– and f
AC
Delta+ refer to the maximum range in which the Sunny Boy is active relative
to f
0
, 60 Hz.
• f
AC
Start delta refers to the frequency increase relative to f
0
, at which point the frequency shift
power control begins
• f
AC
Limit delta refers to the frequency increase relative to f
0
, at which point the frequency shift
power control stops. The power of the Sunny Boy at this point is 0 W.
If the limiting value "f
AC
Delta–" is fallen below or if "f
AC
Delta+" is exceeded, then the Sunny Boy
inverters disconnect from the utility grid.
When FSPC is activated and the diesel generator in the stand-alone grid is in operation, the diesel
generator determines the frequency, and the Sunny Boy inverters react to certain changes in the diesel
generator frequency. The diesel generators generally operate at 60 Hz under load. For this reason,
in most cases the Sunny Boy inverters will deliver their entire power to the stand-alone grid, even when
the generator is in operation.
Short-term increase of the frequency possible
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 temporarily
increases the frequency and disconnects the Sunny Boy inverters using the frequency shutdown
method (overfrequency). Afterwards, it synchronizes with the generator.
Summary of Contents for Sunny Island 4548-US
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